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首页> 外文学位 >A two-season impact study of ASCAT and WindSat surface wind retrievals in the NCEP global data assimilation system.
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A two-season impact study of ASCAT and WindSat surface wind retrievals in the NCEP global data assimilation system.

机译：在NCEP全局数据同化系统中对ASCAT和WindSat地表风反演进行了两个季节的影响研究。

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摘要

The WindSat/Coriolis satellite is a polarimetric microwave radiometer used to measure ocean surface wind. The Advanced SCATterometer (ASCAT) instrument, on the European Meteorological Operational (MetOp) satellite program's - polar orbiting MetOp-A satellite, has been primarily designed to provide global ocean wind with extended coverage, and better accuracy in the wind components than previous comparable satellites.;Using the National Centers for Environmental Prediction (NCEP) Global Data Assimilation/Global Forecast System (GDAS/GFS), the forecast impacts associated with the assimilation of the WindSat and ASCAT surface wind products into the NCEP GDAS/GFS during two-season observing system experiments (OSEs) are studied. In addition, quality control procedures required to assimilate the surface winds are developed.;The impacts of assimilating the ASCAT and WindSat surface wind products were assessed by comparing the output of control simulations utilizing all the data types assimilated into the operational GDAS with experimental simulations using these new surface wind products. Changes in anomaly correlation (AC) and forecast impact (FI) are used to diagnose the influence of the data. FI is a useful diagnostic of short term forecast skill.;For both seasons, the results of these studies show that the assimilation of WindSat and ASCAT surface wind retrievals improves forecast skill in terms of anomaly correlation of geopotential height at 1000 and 500hPa. Positive forecast impacts are noted for wind and temperature field particularly in the tropics for 500hPa wind speed field starting from 6 hour forecast and beyond.;In addition to the forecast impact results from assimilation of the ocean surface wind vectors, case assessments have been performed to investigate the surface winds vectors' impact on the development African easterly waves.
机译：WindSat / Coriolis卫星是用于测量海面风的偏振微波辐射计。欧洲气象运行（MetOp）卫星计划的极轨MetOp-A卫星上的高级SCATterometer（ASCAT）仪器主要旨在为全球海洋风提供更广的覆盖范围，并且比以前的同类卫星具有更好的风分量精度。;使用国家环境预测中心（NCEP）全球数据同化/全球预报系统（GDAS / GFS），在两个季节内与将WindSat和ASCAT地面风产品同化为NCEP GDAS / GFS相关的预测影响研究了观测系统实验（OSE）。此外，还开发了吸收地面风所需的质量控制程序。通过比较利用所有被吸收到运营GDAS中的数据类型的控制模拟输出与使用GDAS进行的实验模拟，评估了ASCAT和WindSat地面风产品吸收的影响。这些新的地面风力产品。异常相关性（AC）和预测影响（FI）的变化用于诊断数据的影响。 FI是短期预报技能的有用诊断方法。在两个季节中，这些研究的结果表明，对WindSat和ASCAT地表风反演的同化可以提高1000h和500hPa地势高度的异常相关性。注意到对风和温度场有积极的预测影响，特别是在热带地区，从6小时及以后的预报开始对500hPa风速场产生影响；除了同化海面风向矢量的预测影响结果之外，还进行了案例评估调查地表风矢量对非洲东风发展的影响。

著录项

  • 作者

    Bi, Li.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Atmospheric Sciences.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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