Zobrazeno 1 - 10 of 11 pro vyhledávání: '"Masashi Ujiie"'
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Akademický článek
Uncertainty in the Representation of Orography in Weather and Climate Models and Implications for Parameterized Drag
Autor: Andrew D. Elvidge, Irina Sandu, Nils Wedi, Simon B. Vosper, Ayrton Zadra, Souhail Boussetta, François Bouyssel, Annelize vanNiekerk, Mikhail A. Tolstykh, Masashi Ujiie
Publikováno v: Journal of Advances in Modeling Earth Systems, Vol 11, Iss 8, Pp 2567-2585 (2019)
Abstract The representation of orographic drag remains a major source of uncertainty for numerical weather prediction (NWP) and climate models. Its accuracy depends on contributions from both the model grid‐scale orography and the subgrid‐scale o
Externí odkaz: https://doaj.org/article/7b1aba8b64ea4588a2d4bfaff68a036b
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2
Uncertainty in the Representation of Orography in Weather and Climate Models and Implications for Parameterized Drag
Autor: Nils Wedi, Andrew D. Elvidge, Mikhail A. Tolstykh, Souhail Boussetta, Simon Vosper, François Bouyssel, Ayrton Zadra, Annelize van Niekerk, Irina Sandu, Masashi Ujiie
Publikováno v: Journal of Advances in Modeling Earth Systems, Vol 11, Iss 8, Pp 2567-2585 (2019)
The representation of orographic drag remains a major source of uncertainty for numerical weather prediction (NWP) and climate models. Its accuracy depends on contributions from both the model grid‐scale orography and the subgrid‐scale orography
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a91bcf4a2d1c95a9e884ef7fb251a18
https://doaj.org/article/7b1aba8b64ea4588a2d4bfaff68a036b
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3
Elimination of spectral blocking by ensuring rotation-free property of discretised pressure gradient within a spectral semi-implicit semi-Lagrangian global atmospheric model
Autor: Daisuke Hotta, Masashi Ujiie
The widely-adopted discretisation of the horizontal pressure gradient term formulated by Simmons and Burridge (1981) for atmospheric models on $\sigma$-$p$ hybrid vertical coordinate is found to incur spectral blocking for rotational wind components
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::388ce3e5759e2ccaa6c09c4fc665845b
http://arxiv.org/abs/1908.11686
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6
A nestable, multigrid-friendly grid on a sphere for global spectral models based on Clenshaw-Curtis quadrature
Autor: Daisuke Hotta, Masashi Ujiie
A new grid system on a sphere is proposed that allows for straight-forward implementation of both spherical-harmonics-based spectral methods and gridpoint-based multigrid methods. The latitudinal gridpoints in the new grid are equidistant and spectra
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15ea98df5f705bc2a7432c5b81c10573
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7
Isentropic Analysis of Polar Cold Airmass Streams in the Northern Hemispheric Winter
Autor: Masahiro Sawada, Toshiki Iwasaki, Yuki Kanno, Koutarou Takaya, Masashi Ujiie, Takamichi Shoji
Publikováno v: Journal of the Atmospheric Sciences. 71:2230-2243
An analysis method is proposed for polar cold airmass streams from generation to disappearance. It designates a threshold potential temperature θT at around the turning point of the extratropical direct (ETD) meridional circulation from downward to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b9b6eb1ee078429d8961504064dad71
https://doi.org/10.1175/jas-d-13-058.1
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8
The Temporal Evolution and Spatial Structure of the Local Easterly Wind “Kiyokawa-dashi” in Japan PART II: Numerical Simulations
Autor: Kaori Sasaki, Akira. T. Noda, Toshikazu Itabe, Hiromitsu Kanno, Dai Matsushima, Kohei Mizutani, Masahiro Sawada, Yousuke Matsuura, Masashi Ujiie, Toshiki Iwasaki, Weiming Sha, Tetsuo Aoki, Shoken Ishii
Publikováno v: Journal of the Meteorological Society of Japan. Ser. II. 88:161-181
A numerical simulation of the strong southeasterly (SE) "Kiyokawa-dashi" wind in Yamagata, Japan on August 30, 2004, is examined and compared to the Coherent Doppler Lidar (CDL) observation. Three-dimensional numerical simulations were performed usin
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c40846384202c2fafcfe46bb662e12d2
https://doi.org/10.2151/jmsj.2010-204
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9
Temporal Evolution and Spatial Structure of the Local Easterly Wind 'Kiyokawa-Dashi' in Japan PART I: Coherent Doppler Lidar Observations
Autor: Masashi Ujiie, Akira. T. Noda, Kohei Mizutani, Kaori Sasaki, Hiromitsu Kanno, Yosuke Matsuura, Tetsuo Aoki, Shoken Ishii, Toshiki Iwasaki, Masahiro Sawada, Toshikazu Itabe, Weiming Sha, Dai Matsushima
Publikováno v: Journal of the Meteorological Society of Japan. Ser. II. 85:797-813
The Kiyokawa-dashi (strong local wind) was observed with a coherent Doppler lidar at the exit of the Mogami Valley, in Kiyokawa (38.80°N, 140.01°E, 20 m MSL) during the summers of 2003 and 2004. Used to define days on which the Kiyokawa-dashi wind
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fc0d9712ac869533ec1c0014bcde27f7
https://doi.org/10.2151/jmsj.85.797
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10
Eliassen–Palm Flux Diagnosis Based on Isentropic Representation
Autor: Daisuke Tanaka, Sachiyo Uno, Masashi Ujiie, Kazuyuki Miyazaki, Toshiki Iwasaki
Publikováno v: Journal of the Atmospheric Sciences. 61:2370-2383
This paper demonstrates an isentropic representation of the Eliassen–Palm flux (EP flux) as a tool for diagnosis of the atmospheric zonal mean states. This is a full extension of the transformed Eulerian mean (TEM) to express lower boundary conditi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::79612750574a9db7fdd676b2ff0e7ba8
https://doi.org/10.1175/1520-0469(2004)061<2370:efdboi>2.0.co
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