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"https://api.researchmap.jp/KS-atmos/awards/2011157", "@type": "awards", "@reverse": "https://api.researchmap.jp/KS-atmos/awards", "rm:id": "2011157", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "1000366415", "rm:creator_type": "myself", "rm:created": "2017-01-06T10:07:39Z", "rm:modifier_id": "1000366415", "rm:modifier_type": "myself", "rm:modified": "2017-01-06T10:07:39Z", "award_name": { "ja": "第8回海洋立国推進功労者表彰(内閣総理大臣賞)(南極昭和基地大型大気レーダーチーム)", "en": "Commendation of the Contributor of the Promotion of Building the Maritime Nation of Japan" }, "association": { "ja": "内閣府", "en": "Prime Minister, Japan" }, "award_date": "2015-07", "address_country": "JPN" }, { "@id": "https://api.researchmap.jp/KS-atmos/awards/2011156", "@type": "awards", "@reverse": "https://api.researchmap.jp/KS-atmos/awards", "rm:id": "2011156", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "1000366415", 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Society of Japan" }, "award_date": "2000-11", "address_country": "JPN" }, { "@id": "https://api.researchmap.jp/KS-atmos/awards/2011154", "@type": "awards", "@reverse": "https://api.researchmap.jp/KS-atmos/awards", "rm:id": "2011154", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "1000366415", "rm:creator_type": "myself", "rm:created": "2017-01-06T10:07:39Z", "rm:modifier_id": "1000366415", "rm:modifier_type": "myself", "rm:modified": "2017-01-06T10:07:39Z", "award_name": { "ja": "学会賞", "en": "The Award of the Meteorological Society of Japan" }, "association": { "ja": "日本気象学会", "en": "The Meteorological Society of Japan" }, "award_date": "1998-05", "address_country": "JPN" }, { "@id": "https://api.researchmap.jp/KS-atmos/awards/2011153", "@type": "awards", "@reverse": "https://api.researchmap.jp/KS-atmos/awards", "rm:id": "2011153", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "1000366415", "rm:creator_type": "myself", "rm:created": "2017-01-06T10:07:39Z", "rm:modifier_id": "1000366415", "rm:modifier_type": "myself", "rm:modified": "2017-01-06T10:07:39Z", "award_name": { "ja": "山本・正野論文賞", "en": "Yamamoto-Syono Award for Outstanding Paper" }, "association": { "ja": "日本気象学会", "en": "The Meteorological Society of Japan" }, "award_date": "1991-10", "address_country": "JPN" } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos", "total_items": 171, "items": [ { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/44358178", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "44358178", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2023-12-28T03:34:39Z", "rm:modifier_id": "ai:assign_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2023-12-28T03:34:39Z", "paper_title": { "en": "Atmospheric Ionizations by Solar X‐Rays, Solar Protons, and Radiation Belt Electrons in September 2017 Space Weather Event" }, "authors": { "en": [ { "name": "Kiyoka Murase" }, { "name": "Ryuho Kataoka" }, { "name": "Takanori Nishiyama" }, { "name": "Kaoru Sato" }, { "name": "Masaki Tsutsumi" }, { "name": "Yoshimasa Tanaka" }, { "name": "Yasunobu Ogawa" }, { "name": "Tatsuhiko Sato" } ] }, "description": { "en": "Abstract\n\nEnergetic particles from space deposit their energies on the Earth's atmosphere and contribute to variations in the concentration of neutral components such as ozone which controls the atmospheric temperature balance. Comprehensive understandings of their global impact on the atmosphere require whole pictures of spatiotemporal ionization distributions due to them. We first attempt to evaluate and summarize the altitude profiles of ionization for the September 2017 space weather event with cutting‐edge space‐borne and ground‐based observations of different types of particle inputs. In early September 2017, the Sun showed notable activity, including X‐class flares and solar proton events. During this period, ground‐based radar observations have confirmed atmospheric ionization events by energetic particle precipitations of solar flare X‐rays, solar protons, and radiation belt electrons, the main sources of ionization into the Earth's atmosphere. We estimate the altitude profiles of the ionization rate by using the Particle and Heavy Ion Transport code System (PHITS) with the input of the particle fluxes obtained by satellites. The estimates are then compared with measurements of the ionization altitude, ionization intensity, and electron density by the radars in the polar region, such as the PANSY radar at Syowa Station and the EISCAT in Tromsø, Norway. We conclude that the PHITS simulation results reasonably reproduce (within the error of a factor of two) those ionizations measured by ground‐based instruments with inputs of observed ionization sources by satellites." }, "publisher": { "en": "American Geophysical Union (AGU)" }, "publication_date": "2023-12-27", "publication_name": { "en": "Space Weather" }, "volume": "21", "number": "12", "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1029/2023sw003651" ], "issn": [ "1542-7390" ], "e_issn": [ "1542-7390" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1029/2023sw003651", "is_downloadable": false }, { "label": "url", "@id": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023SW003651", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/42471636", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "42471636", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2023-06-06T03:31:35Z", "rm:modifier_id": "ai:identify_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2023-10-30T21:00:34Z", "paper_title": { "en": "Interhemispheric Coupling Study by Observations and Modelling (ICSOM): Concept, Campaigns, and Initial Results" }, "authors": { "en": [ { "name": "Kaoru Sato" }, { "name": "Yoshihiro Tomikawa" }, { "name": "Masashi Kohma" }, { "name": "Ryosuke Yasui" }, { "name": "Dai Koshin" }, { "name": "Haruka Okui" }, { "name": "Shingo Watanabe" }, { "name": "Kazuyuki Miyazaki" }, { "name": "Masaki Tsutsumi" }, { "name": "Damian Murphy" }, { "name": "Chris Meek" }, { "name": "Yufang Tian" }, { "name": "Manfred Ern" }, { "name": "Gerd Baumgarten" }, { "name": "Jorge L. Chau" }, { "name": "Xinzhao Chu" }, { "name": "Richard Collins" }, { "name": "Patrick J. Espy" }, { "name": "Hiroyuki Hashiguchi" }, { "name": "Andrew J. Kavanagh" }, { "name": "Ralph Latteck" }, { "name": "Franz‐Josef Lübken" }, { "name": "Marco Milla" }, { "name": "Satonori Nozawa" }, { "name": "Yasunobu Ogawa" }, { "name": "Kazuo Shiokawa" }, { "name": "M. Joan Alexander" }, { "name": "Takuji Nakamura" }, { "name": "William E. Ward" } ] }, "description": { "en": "Abstract\n\nAn international joint research project, entitled Interhemispheric Coupling Study by Observations and Modelling (ICSOM), is ongoing. In the late 2000s, an interesting form of interhemispheric coupling (IHC) was discovered: when warming occurs in the winter polar stratosphere, the upper mesosphere in the summer hemisphere also becomes warmer with a time lag of days. This IHC phenomenon is considered to be a coupling through processes in the middle atmosphere (i.e., stratosphere, mesosphere, and lower thermosphere). Several plausible mechanisms have been proposed so far, but they are still controversial. This is mainly because of the difficulty in observing and simulating gravity waves (GWs) at small scales, despite the important role they are known to play in middle atmosphere dynamics. In this project, by networking sparsely but globally distributed radars, mesospheric GWs have been simultaneously observed in seven boreal winters since 2015/16. We have succeeded in capturing five stratospheric sudden warming events and two polar vortex intensification events. This project also includes the development of a new data assimilation system to generate long‐term reanalysis data for the whole middle atmosphere, and simulations by a state‐of‐the‐art GW‐permitting general circulation model using the reanalysis data as initial values. By analyzing data from these observations, data assimilation, and model simulation, comprehensive studies to investigate the mechanism of IHC are planned. This paper provides an overview of ICSOM, but even initial results suggest that not only GWs but also large‐scale waves are important for the mechanism of the IHC." }, "publisher": { "en": "American Geophysical Union (AGU)" }, "publication_date": "2023-05-29", "publication_name": { "en": "Journal of Geophysical Research: Atmospheres" }, "volume": "128", "number": "11", "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1029/2022jd038249" ], "issn": [ "2169-897X" ], "e_issn": [ "2169-8996" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1029/2022jd038249", "is_downloadable": false }, { "@id": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2022JD038249", "is_downloadable": false, "label": "url" } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/42366335", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "42366335", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_papers", "rm:creator_type": "coauthor", "rm:created": "2023-05-23T07:35:57Z", "rm:modifier_id": "ai:identify_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2023-07-20T10:55:40Z", "paper_title": { "en": "Water vapor in the upper troposphere above Syowa Station in the Antarctic: Its variations and causes" }, "authors": { "en": [ { "name": "Y. Tomikawa" }, { "name": "M. Kohma" }, { "name": "M. Takeda" }, { "name": "K. Sato" } ] }, "publisher": { "en": "Meteorological Society of Japan" }, "publication_date": "2023-05", "publication_name": { "en": "Scientific Online Letters on the Atmosphere" }, "volume": "19", "starting_page": "86", "ending_page": "93", "languages": [ "eng" ], "referee": true, "invited": false, "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.2151/sola.2023-012" ], "e_issn": [ "1349-6476" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.2151/sola.2023-012", "is_downloadable": false }, { "label": "url", "@id": "https://www.jstage.jst.go.jp/article/sola/19/0/19_2023-012/_pdf", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/41814545", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "41814545", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_papers", "rm:creator_type": "coauthor", "rm:created": "2023-03-24T06:16:45Z", "rm:modifier_id": "ai:assign_based_papers", "rm:modifier_type": "coauthor", "rm:modified": "2023-03-24T06:16:45Z", "paper_title": { "ja": "LODEWAVE (LOng-Duration balloon Experiment of gravity WAVE over Antarctica)", "en": "LODEWAVE (LOng-Duration balloon Experiment of gravity WAVE over Antarctica)" }, "authors": { "ja": [ { "name": "Y. Tomikawa" }, { "name": "K. Sato" }, { "name": "Y. Saito" }, { "name": "I. Murata" }, { "name": "N. Hirasawa" }, { "name": "M. Kohma" }, { "name": "K. Nakashino" }, { "name": "D. Akita" }, { "name": "T. Matsuo" }, { "name": "M. Fujiwara" }, { "name": "T. Kaho" }, { "name": "L. Yoshida" } ], "en": [ { "name": "Y. Tomikawa" }, { "name": "K. Sato" }, { "name": "Y. Saito" }, { "name": "I. Murata" }, { "name": "N. Hirasawa" }, { "name": "M. Kohma" }, { "name": "K. Nakashino" }, { "name": "D. Akita" }, { "name": "T. Matsuo" }, { "name": "M. Fujiwara" }, { "name": "T. Kaho" }, { "name": "L. Yoshida" } ] }, "publication_date": "2023-03", "publication_name": { "ja": "J. Evolv. Space Activ.", "en": "J. Evolv. Space Activ." }, "volume": "1", "number": "14", "starting_page": "1", "ending_page": "8", "languages": [ "eng" ], "referee": true, "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.57350/jesa.14" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.57350/jesa.14", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/41581909", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "41581909", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2023-03-01T03:30:50Z", "rm:modifier_id": "ai:assign_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2023-03-01T03:30:50Z", "paper_title": { "en": "Kelvin‐Helmholtz Billows in the Troposphere and Lower Stratosphere Detected by the PANSY Radar at Syowa station in the Antarctic" }, "authors": { "en": [ { "name": "Yuichi Minamihara" }, { "name": "Kaoru Sato" }, { "name": "Masaki Tsutsumi" } ] }, "publisher": { "en": "American Geophysical Union (AGU)" }, "publication_date": "2023-02-21", "publication_name": { "en": "Journal of Geophysical Research: Atmospheres" }, "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1029/2022jd036866" ], "issn": [ "2169-897X" ], "e_issn": [ "2169-8996" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1029/2022jd036866", "is_downloadable": false }, { "label": "url", "@id": "https://onlinelibrary.wiley.com/doi/pdf/10.1029/2022JD036866", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/40875771", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "40875771", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2022-12-25T03:33:46Z", "rm:modifier_id": "ai:assign_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2022-12-25T03:33:46Z", "paper_title": { "en": "Gravity Wave Morphology During the 2018 Sudden Stratospheric Warming Simulated by a Whole Neutral Atmosphere General Circulation Model" }, "authors": { "en": [ { "name": "S. Watanabe" }, { "name": "D. Koshin" }, { "name": "S. Noguchi" }, { "name": "K. Sato" } ] }, "publisher": { "en": "American Geophysical Union (AGU)" }, "publication_date": "2022-10-16", "publication_name": { "en": "Journal of Geophysical Research: Atmospheres" }, "volume": "127", "number": "19", "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1029/2022jd036718" ], "issn": [ "2169-897X" ], "e_issn": [ "2169-8996" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1029/2022jd036718", "is_downloadable": false }, { "label": "url", "@id": "https://onlinelibrary.wiley.com/doi/pdf/10.1029/2022JD036718", "is_downloadable": false }, { "label": "url", "@id": "https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2022JD036718", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/41037951", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "41037951", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_papers", "rm:creator_type": "coauthor", "rm:created": "2023-01-05T05:41:35Z", "rm:modifier_id": "ai:assign_based_papers", "rm:modifier_type": "coauthor", "rm:modified": "2023-01-05T05:41:35Z", "paper_title": { "en": "Characteristics of the Intraseasonal Oscillation in the Equatorial Mesosphere and Lower Thermosphere Region Revealed by Satellite Observation and Global Analysis by the JAGUAR Data Assimilation System" }, "authors": { "en": [ { "name": "D. Koshin" }, { "name": "M. Kohma" }, { "name": "K. Sato" } ] }, "publication_date": "2022-08-27", "publication_name": { "en": "Journal of Geophysical Research: Atmospheres" }, "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1029/2022JD036816" ], "orcid_put_cd": [ "117044162" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1029/2022JD036816", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/39755925", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "39755925", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_papers", "rm:creator_type": "ai", "rm:created": "2022-08-27T06:24:06Z", "rm:modifier_id": "ai:identify_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2022-12-19T06:24:46Z", "paper_title": { "en": "Reduced error and uncertainty in analysis and forecasting in the Southern Hemisphere through assimilation of PANSY radar observations from Syowa Station: a mid‐latitude extreme cyclone case", "ja": "Reduced error and uncertainty in analysis and forecasting in the Southern Hemisphere through assimilation of PANSY radar observations from Syowa Station: a mid‐latitude extreme cyclone case" }, "authors": { "en": [ { "name": "Kazutoshi Sato" }, { "name": "Jun Inoue" }, { "name": "Akira Yamazaki" }, { "name": "Yoshihiro Tomikawa" }, { "name": "Kaoru Sato" } ], "ja": [ { "name": "Kazutoshi Sato" }, { "name": "Jun Inoue" }, { "name": "Akira Yamazaki" }, { "name": "Yoshihiro Tomikawa" }, { "name": "Kaoru Sato" } ] }, "publisher": { "en": "Wiley" }, "publication_date": "2022-07-19", "publication_name": { "en": "Quarterly Journal of the Royal Meteorological Society" }, "volume": "148", "number": "748", "starting_page": "3115", "ending_page": "3130", "languages": [ "eng" ], "referee": true, "invited": false, "published_paper_type": "scientific_journal", "is_international_journal": true, "is_international_collaboration": false, "rm:is_open_access": false, "identifiers": { "doi": [ "10.1002/qj.4347" ], "issn": [ "0035-9009" ], "e_issn": [ "1477-870X" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1002/qj.4347", "is_downloadable": true }, { "@id": "https://onlinelibrary.wiley.com/doi/pdf/10.1002/qj.4347", "is_downloadable": true, "label": "url" } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/43625010", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "43625010", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2023-09-30T03:32:36Z", "rm:modifier_id": "ai:assign_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2023-09-30T03:32:36Z", "paper_title": { "en": "Contribution of Gravity Waves to Universal Vertical Wavenumber (similar to m(-3)) Spectra Revealed by a Gravity-Wave-Permitting General Circulation Model" }, "authors": { "en": [ { "name": "Haruka Okui" }, { "name": "Kaoru Sato" }, { "name": "Shingo Watanabe" } ] }, "description": { "en": "Observations with high vertical resolution have revealed that power spectra of horizontal wind and temperature fluctuations versus vertical wavenumber m have a universal shape with a steep slope in a high m range, approximately proportional to m(-3). Several theoretical models explaining this spectral slope were proposed under an assumption of gravity wave (GW) saturation. However, little evidence has been obtained to show that these universal spectra are fully composed of GWs. To confirm the validity of this assumption, two kinds of m spectra are calculated using outputs from a GW-permitting high-top general circulation model. One is the spectra for GWs designated by fluctuations having total horizontal wavenumbers of 21-639. The other is the spectra of fluctuations unfiltered except extracting the linear trend in each vertical profile that were often analyzed in the observational studies. A comparison between the two shows that GWs dominate the observed spectra only in a higher m part of the steep slope, whereas disturbances other than GWs significantly contribute to its lower m part. Moreover, geographical distributions of the characteristic wavenumbers, slopes, and spectral densities of GW spectra are examined for several divided height regions of the whole middle atmosphere. It is shown that strong vertical shear below the zonal wind jets as well as wave saturation are responsible for the formation of the steep slopes of GW spectra.Plain Language Summary Radar, lidar, and radiosonde observations have revealed that vertical wavenumber power spectra of horizontal wind and temperature fluctuations have a common shape with a steep slope. Several theoretical studies have explained this universality by assuming that these spectra are composed of saturated gravity waves. To confirm the validity of this assumption, a spectral analysis of gravity waves, having short horizontal wavelengths, was conducted using a gravity-wave-permitting high-top general circulation model. A comparison of the spectra of gravity waves with those of all model-simulated disturbances showed that disturbances other than gravity waves significantly contribute to the spectra in a low verticalwavenumber part of the steep slope. Moreover, vertical and geographical variations in the characteristics of gravity wave spectra were described. It is inferred that strong vertical shear below the eastward and westward jets as well as the wave saturation are responsible for the formation of the steep slopes of gravity wave spectra. Deepening our understanding of gravity waves in the middle atmosphere, these findings may provide useful guidelines for improving parameterizations of gravity waves in climate models." }, "publisher": { "en": "AMER GEOPHYSICAL UNION" }, "publication_date": "2022-05", "publication_name": { "en": "JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES" }, "volume": "127", "number": "10", "languages": [ "eng" ], "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1029/2021JD036222" ], "issn": [ "2169-897X" ], "e_issn": [ "2169-8996" ], "wos_id": [ "WOS:000800108900001" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1029/2021JD036222", "is_downloadable": false }, { "label": "web_of_science", "@id": "https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000800108900001&DestApp=WOS_CPL", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/37810837", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "37810837", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2022-07-01T09:44:36Z", "rm:modifier_id": "ai:assign_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2022-07-01T09:44:36Z", "paper_title": { "en": "Dynamical analysis of tropopause folding events in the coastal region of Antarctica" }, "authors": { "en": [ { "name": "Masashi Kohma" }, { "name": "Masatoshi Mizukoshi" }, { "name": "Kaoru Sato" } ] }, "description": { "en": "Abstract\n\nTropopause folding events (TFs) are characterized by the rapid and deep descent of the tropopause and is considered to play a significant role in mass exchange between the stratosphere and troposphere. In the present study, TFs occurring in the Antarctic coastal region were examined using ERA-5 data set. First, the climatological distribution of TF frequency in the extratropics of the Southern Hemisphere was examined. Similar to results from previous studies, TFs were found to often occur along the coast of Antarctica, which is located more than 1000 km south of the maximum of the eddy kinetic energy of synoptic-scale disturbances. This result suggests that the climatological pattern of frequency of TFs in the southern high latitudes cannot be explained only by the geographical distribution of storm tracks. Next, a composite analysis of TFs at Syowa Station was performed. When the negative anomaly of the tropopause height was greatest, strong Q-vector divergence and downwelling were observed in the vicinity of the TF locations. The distribution of Q vectors is related to a local westerly jet and strengthening of the frontal structure associated with meridionally contracted synoptic-scale disturbances. The roles of the topography of the Antarctic Plateau and the radiative cooling on the surface of the continent during the contraction of the disturbances are also discussed based on ray-tracing theory." }, "publisher": { "en": "American Meteorological Society" }, "publication_date": "2022-04-04", "publication_name": { "en": "Journal of Climate" }, "starting_page": "1", "ending_page": "31", "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1175/jcli-d-21-0858.1" ], "issn": [ "0894-8755" ], "e_issn": [ "1520-0442" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1175/jcli-d-21-0858.1", "is_downloadable": false }, { "label": "url", "@id": "https://journals.ametsoc.org/view/journals/clim/aop/JCLI-D-21-0858.1/JCLI-D-21-0858.1.xml", "is_downloadable": false }, { "label": "url", "@id": "https://journals.ametsoc.org/downloadpdf/journals/clim/aop/JCLI-D-21-0858.1/JCLI-D-21-0858.1.xml", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/37787239", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "37787239", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_internal_feeds", "rm:creator_type": "ai", "rm:created": "2022-07-01T08:25:13Z", "rm:modifier_id": "ai:assign_based_internal_feeds", "rm:modifier_type": "ai", "rm:modified": "2022-07-01T08:25:13Z", "paper_title": { "en": "An update on the 4D-LETKF data assimilation system for the whole neutral atmosphere" }, "authors": { "en": [ { "name": "Dai Koshin" }, { "name": "Kaoru Sato" }, { "name": "Masashi Kohma" }, { "name": "Shingo Watanabe" } ] }, "description": { "en": "Abstract. The four-dimensional local ensemble transform Kalmanfilter (4D-LETKF) data assimilation system for the whole neutral atmosphereis updated to better represent disturbances with wave periods shorter than 1 d in the mesosphere and lower thermosphere (MLT) region. First,incremental analysis update (IAU) filtering is introduced to reduce thegeneration of spurious waves arising from the insertion of the analysisupdates. The IAU is better than other filtering methods, and also iscommonly used for middle atmospheric data assimilation. Second, the order ofhorizontal diffusion in the forecast model is changed to reproduce the morerealistic tidal amplitudes that were observed by satellites. Third, theSounding of the Atmosphere using Broadband Emission Radiometry (SABER) andSpecial Sensor Microwave Imager/Sounder (SSMIS) observations in thestratosphere and mesosphere also are assimilated. The performance of theresultant analyses is evaluated by comparing them with the mesospheric windsfrom meteor radars, which are not assimilated. The representation ofassimilation products is greatly improved not only for the zonal mean fieldbut also for short-period and/or horizontally small-scale disturbances." }, "publisher": { "en": "Copernicus GmbH" }, "publication_date": "2022-03-17", "publication_name": { "en": "Geoscientific Model Development" }, "volume": "15", "number": "5", "starting_page": "2293", "ending_page": "2307", "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.5194/gmd-15-2293-2022" ], "e_issn": [ "1991-9603" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.5194/gmd-15-2293-2022", "is_downloadable": false }, { "label": "url", "@id": "https://gmd.copernicus.org/articles/15/2293/2022/gmd-15-2293-2022.pdf", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/39505245", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "39505245", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_papers", "rm:creator_type": "ai", "rm:created": "2022-08-04T14:16:44Z", "rm:modifier_id": "1000366415", "rm:modifier_type": "myself", "rm:modified": "2023-08-28T04:48:21Z", "paper_title": { "en": "Mesospheric ionization during substorm growth phase" }, "authors": { "en": [ { "name": "Kiyoka Murase" }, { "name": "Ryuho Kataoka" }, { "name": "Takanori Nishiyama" }, { "name": "Koji Nishimura" }, { "name": "Taishi Hashimoto" }, { "name": "Yoshimasa Tanaka" }, { "name": "Akira Kadokura" }, { "name": "Yoshihiro Tomikawa" }, { "name": "Masaki Tsutsumi" }, { "name": "Yasunobu Ogawa" }, { "name": "Herbert Akihito Uchida" }, { "name": "Kaoru Sato" }, { "name": "Satoshi Kasahara" }, { "name": "Takefumi Mitani" }, { "name": "Shoichiro Yokota" }, { "name": "Tomoaki Hori" }, { "name": "Kunihiro Keika" }, { "name": "Takeshi Takashima" }, { "name": "Yoshiya Kasahara" }, { "name": "Shoya Matsuda" }, { "name": "Masafumi Shoji" }, { "name": "Ayako Matsuoka" }, { "name": "Iku Shinohara" }, { "name": "Yoshizumi Miyoshi" }, { "name": "Tatsuhiko Sato" }, { "name": "Yusuke Ebihara" }, { "name": "Takashi Tanaka" } ] }, "description": { "en": "Many studies have been conducted about the impact of energetic charged particles on the atmosphere during geomagnetically active times, while quiet time effects are poorly understood. We identified two energetic electron precipitation (EEP) events during the growth phase of moderate substorms and estimated the mesospheric ionization rate for an EEP event for which the most comprehensive dataset from ground-based and space-born instruments was available. The mesospheric ionization signature reached below 70 km altitude and continued for ~15 min until the substorm onset, as observed by the PANSY radar and imaging riometer at Syowa Station in the Antarctic region. We also used energetic electron flux observed by the Arase and POES 15 satellites as the input for the air-shower simulation code PHITS to quantitatively estimate the mesospheric ionization rate. The calculated ionization level due to the precipitating electrons is consistent with the observed value of cosmic noise absorption. The possible spatial extent of EEP is estimated to be ~8 h MLT in longitude and ~1.5° in latitude from a global magnetohydrodynamic simulation REPPU and the precipitating electron observations by the POES satellite, respectively. Such a significant duration and spatial extent of EEP events suggest a non-negligible contribution of the growth phase EEP to the mesospheric ionization. Combining the cutting-edge observations and simulations, we shed new light on the space weather impact of the EEP events during geomagnetically quiet times, which is important to understand the possible link between the space environment and climate." }, "publisher": { "en": "EDP Sciences" }, "publication_date": "2022", "publication_name": { "en": "Journal of Space Weather and Space Climate" }, "volume": "12", "starting_page": "18", "ending_page": "18", "published_paper_type": "scientific_journal", "rm:is_open_access": false, "identifiers": { "doi": [ "10.1051/swsc/2022012" ], "e_issn": [ "2115-7251" ] }, "see_also": [ { "label": "doi", "@id": "https://doi.org/10.1051/swsc/2022012", "is_downloadable": false }, { "label": "url", "@id": "https://www.swsc-journal.org/10.1051/swsc/2022012/pdf", "is_downloadable": false } ] }, { "@id": "https://api.researchmap.jp/KS-atmos/published_papers/41435863", "@type": "published_papers", "@reverse": "https://api.researchmap.jp/KS-atmos/published_papers", "rm:id": "41435863", "rm:user_id": "1000366415", "display": "disclosed", "major_achievement": false, "rm:creator_id": "ai:assign_based_papers", "rm:creator_type": "coauthor", "rm:created": "2023-02-14T23:02:56Z", "rm:modifier_id": "ai:assign_based_papers", "rm:modifier_type": "coauthor", "rm:modified": "2023-02-14T23:02:56Z", "paper_title": { "en": "Roles of Rossby Waves, Rossby–Gravity Waves, and Gravity Waves Generated in the Middle Atmosphere for Interhemispheric Coupling" }, "authors": { "en": [ { "name": "Ryosuke Yasui" }, { "name": "Kaoru Sato" }, { "name": "Yasunobu Miyoshi" } ] }, "description": { "en": "