Assimilating QuikSCAT Ocean Surface Winds with the Weather Research and Forecasting Model for Surface Wind-Field Simulation over the Chukchi/Beaufort Seas

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• 作者：Xingang Fan (1)
  Jeremy R. Krieger (2)
  Jing Zhang (3)
  Xiangdong Zhang (4)
  
• 关键词：Data assimilation ; Numerical weather prediction ; QuikSCAT ocean surface winds ; Three ; dimensional variational data assimilation ; Weather Research and Forecasting model
• 刊名：Boundary-Layer Meteorology
• 出版年：2013
• 出版时间：July 2013
• 年：2013
• 卷：148
• 期：1
• 页码：207-226
• 全文大小：1705KB
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• 作者单位：Xingang Fan (1)
  Jeremy R. Krieger (2)
  Jing Zhang (3)
  Xiangdong Zhang (4)
  
  1. Meteorology Program, Department of Geography and Geology, Western Kentucky University, 1906 College Heights Blvd., #31066, Bowling Green, KY, 42101-1066, USA
  2. Arctic Region Supercomputing Center, University of Alaska Fairbanks, Fairbanks, AK, USA
  3. Departments of Physics and Energy and Environmental Systems, North Carolina A&T State University, Greensboro, NC, USA
  4. International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, USA
  
• ISSN：1573-1472

文摘

To achieve a high-quality simulation of the surface wind field in the Chukchi/Beaufort Sea region, quick scatterometer (QuikSCAT) ocean surface winds were assimilated into the mesoscale Weather Research and Forecasting model by using its three-dimensional variational data assimilation system. The SeaWinds instrument on board the polar-orbiting QuikSCAT satellite is a specialized radar that measures ice-free ocean surface wind speed and direction at a horizontal resolution of 12.5 km. A total of eight assimilation case studies over two five-day periods, 1- October 2002 and 20-4 September 2004, were performed. The simulation results with and without the assimilation of QuikSCAT winds were then compared with QuikSCAT data available during the subsequent free-forecast period, coastal station observations, and North American Regional Reanalysis data. It was found that QuikSCAT winds are a potentially valuable resource for improving the simulation of ocean near-surface winds in the Chukchi/Beaufort Seas region. Specifically, the assimilation of QuikSCAT winds improved, (1) offshore surface winds as compared to unassimilated QuikSCAT winds, (2) sea-level pressure, planetary boundary-layer height, as well as surface heat fluxes, and (3) low-level wind fields and geopotential height. Verification against QuikSCAT data also demonstrated the temporal consistency and good quality of QuikSCAT observations.