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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Cyclone surface pressure fields and frontogenesis from NASA scatterometer (NSCAT) winds
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Cyclone surface pressure fields and frontogenesis from NASA scatterometer (NSCAT) winds

机译：飓风表面压力场​​和NASA散射仪（NSCAT）风的前生

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Two extratropical marine cyclones and their associated frontal features are examined by computing surface pressure fields from NASA scatterometer (NSCAT) winds. A variational method solves for a new surface pressure field by blending high-resolution (25 km) relative vorticity computed along the satellite track with an initial geostrophic vorticity field. Employing this method with each successive pass of the satellite over the study area allows this surface pressure field to evolve as dictated by the relative vorticity patterns computed from NSCAT winds. The result is a high-resolution surface pressure field that captures features such as fronts and low-pressure centers in more detail than National Centers for Environmental Prediction (NCEP) reanalyses. While using the actual relative vorticity to adjust the geostrophic vorticity ignores the ageostrophy of surface winds, which can be significant in the vicinity of fronts and jet streaks, it is a necessary approximation given that the technique uses only surface data. The NSCAT surface pressure fields prove to be nearly as accurate as NCEP reanalyses when compared to ship and buoy observations, which is an encouraging result given that NCEP reanalyses incorporate a myriad of data sources and the NSCAT fields rely primarily on one source. in addition, the high-resolution relative vorticity fields computed from NSCAT winds reveal the location of surface fronts in great detail. These fronts are verified using NCEP analyses, in situ data, and satellite imagery. [References: 29]
机译：通过计算来自NASA散射仪（NSCAT）风的表面压力场​​，检查了两个温带海洋气旋及其相关的锋面特征。一种变分方法通过将沿卫星轨道计算出的高分辨率（25 km）相对涡度与初始地转涡旋场相混合来解决新的表面压力场​​。在卫星每次经过研究区域时采用这种方法，可使该表面压力场​​按照从NSCAT风计算出的相对涡度模式确定的方向发展。结果是一个高分辨率的表面压力场​​，比国家环境预测中心（NCEP）重新分析，它可以更详细地捕获前沿和低压中心等特征。尽管使用实际相对涡度来调整地转涡度忽略了表面风的老化，这在锋面和喷射条纹附近可能非常明显，但由于该技术仅使用表面数据，因此有必要进行近似。与船舶和浮标观察相比，NSCAT表面压力场​​被证明与NCEP重新分析几乎一样准确，这是令人鼓舞的结果，因为NCEP重新分析包含了无数数据源，而NSCAT场主要依赖于一个源。此外，由NSCAT风计算得到的高分辨率相对涡度场还非常详细地揭示了地表锋的位置。这些战线已通过NCEP分析，原位数据和卫星图像进行了验证。 [参考：29]

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