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Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region,as revealed by the WRF simulations
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  • 英文篇名:Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region,as revealed by the WRF simulations
  • 作者:GAO ; Jiaxiang ; ZHANG ; Rong-Hua ; WANG ; Hongna
  • 英文作者:GAO Jiaxiang;ZHANG Rong-Hua;WANG Hongna;CAS Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Laboratory for Ocean Dynamics and Climate,Qingdao National Laboratory for Marine Science and Technology;
  • 英文关键词:mesoscale SST perturbations and ef fects;;WRF model;;Kuroshio-Oyashio Extension;;climatological precipitation
  • 中文刊名:HYFW
  • 英文刊名:海洋湖沼学报(英文)
  • 机构:CAS Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Laboratory for Ocean Dynamics and Climate,Qingdao National Laboratory for Marine Science and Technology;
  • 出版日期:2019-03-15
  • 出版单位:Journal of Oceanology and Limnology
  • 年:2019
  • 期:v.37
  • 基金:Supported by the National Key Research and Development Program of China(Nos.2017YFC1404102,2017YFC1404100);; the National Natural Science Foundation of China(Nos.41490644,41490640);; the Chinese Academy of Sciences Strategic Priority Project,the Western Pacific Ocean System(No.XDA11010105);; the NSFC-Shandong Joint Fund for Marine Science Research Centers(No.U1406402);; the Taishan Scholarship and the Recruitment Program of Global Experts
  • 语种:英文;
  • 页:HYFW201902002
  • 页数:13
  • CN:02
  • ISSN:37-1518/P
  • 分类号:13-25
摘要
Mesoscale coupling between perturbations of mesoscale sea surface temperature(SST) and lowlevel winds has been extensively studied using available high-resolution satellite observations. However, the climatological impacts of mesoscale SST perturbations(SST_(meso)) on the free atmosphere have not been fully understood. In this study, the rectified ef fect of SST_(meso) on local climatological precipitation in the KuroshioOyashio Extension(KOE) region is investigated using the Weather Research and Forecasting(WRF)Model; two runs are performed, one forced by low-resolution SST fields(almost no mesoscale signals) and another by additional high-resolution SST_(meso) fields extracted from satellite observations. Climatological precipitation response to SST_(meso) is characterized mainly by enhanced precipitation on the warmer flank of three oceanic SST fronts in this region. The results show that the positive correlation between the 10-m wind speed perturbations and SST_(meso) is well captured by the WRF model with a reasonable spatial pattern but relatively weak strength. The addition of SST_(meso) improves the climatological precipitation simulated by WRF with a better representation of fine-scale structures compared with satellite observations. A closer examination on the underlying mechanism suggests that while the pressure adjustment mechanism can explain the climatological precipitation enhancement along the fronts and the relatively high contribution of the convective precipitation, other factors such as synoptic events should also be taken into consideration to account for the seasonality of the precipitation response.
        Mesoscale coupling between perturbations of mesoscale sea surface temperature(SST) and lowlevel winds has been extensively studied using available high-resolution satellite observations. However, the climatological impacts of mesoscale SST perturbations(SST_(meso)) on the free atmosphere have not been fully understood. In this study, the rectified ef fect of SST_(meso) on local climatological precipitation in the KuroshioOyashio Extension(KOE) region is investigated using the Weather Research and Forecasting(WRF)Model; two runs are performed, one forced by low-resolution SST fields(almost no mesoscale signals) and another by additional high-resolution SST_(meso) fields extracted from satellite observations. Climatological precipitation response to SST_(meso) is characterized mainly by enhanced precipitation on the warmer flank of three oceanic SST fronts in this region. The results show that the positive correlation between the 10-m wind speed perturbations and SST_(meso) is well captured by the WRF model with a reasonable spatial pattern but relatively weak strength. The addition of SST_(meso) improves the climatological precipitation simulated by WRF with a better representation of fine-scale structures compared with satellite observations. A closer examination on the underlying mechanism suggests that while the pressure adjustment mechanism can explain the climatological precipitation enhancement along the fronts and the relatively high contribution of the convective precipitation, other factors such as synoptic events should also be taken into consideration to account for the seasonality of the precipitation response.
引文
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