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タイトル: | Long-term impacts of ocean wave-dependent roughness on global climate systems |
著者: | Shimura, Tomoya https://orcid.org/0000-0001-8284-0668 (unconfirmed) Mori, Nobuhito https://orcid.org/0000-0001-9082-3235 (unconfirmed) Takemi, Tetsuya https://orcid.org/0000-0002-7596-2373 (unconfirmed) Mizuta, Ryo |
著者名の別形: | 森, 信人 |
キーワード: | ocean surface waves GCM wave-atmosphere coupling momentum roughness length |
発行日: | 15-Mar-2017 |
出版者: | American Geophysical Union |
誌名: | Journal of Geophysical Research: Oceans |
巻: | 122 |
号: | 3 |
開始ページ: | 1995 |
終了ページ: | 2011 |
抄録: | Ocean surface waves can play an active role in climate systems, but they are often ignored in Global Climate Models (GCMs). Wave-dependent surface roughness was implemented within the Atmospheric GCM (MRI-AGCM) using the spectral wave model WAVEWATCH III. Two types of wave-dependent roughness, due to wave steepness and to wave age, were considered. Climate simulations with wave-dependent roughness were compared to simulations with just wind speed-dependent roughness. In climate simulation with wave steepness-dependent roughness, the spatial distribution of roughness is correlated to that of swell dominance. In simulation with wave age-dependent roughness, the spatial distribution of roughness is correlated to that of wind direction stationarity. Both simulations show reduced roughness in the tropics, which leads to an enhancement of surface wind speeds by up to 15%; these enhanced wind speeds are closer to observations compared with the baseline simulation with just wind speed-dependent roughness. We find that the reduced roughness and the enhanced wind speeds in the tropics lead to significant changes in atmospheric circulation, as in Hadley circulation and precipitation. The characteristic responses of the Hadley circulation and precipitation to changing sea surface roughness are presented. |
著作権等: | ©2017. The Authors.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. |
URI: | http://hdl.handle.net/2433/219472 |
DOI(出版社版): | 10.1002/2016JC012621 |
出現コレクション: | 学術雑誌掲載論文等 |
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