One- and Two-Dimensional Wind Speed Models for Ka-Band Altimetry
One- and Two-Dimensional Wind Speed Models for Ka-Band Altimetry
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DOI：
10.1175/jtech-d-13-00167.1
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发表时间：
2014-03
影响因子：
2.2
通讯作者：
J. Lillibridge;R. Scharroo;S. Abdalla;D. Vandemark
中科院分区：
文献类型：
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作者：
J. Lillibridge;R. Scharroo;S. Abdalla;D. Vandemark
SARAL是搭载Argos和AltiKa的卫星，是第一个搭载Ka波段仪器(AltiKa)的卫星雷达测高任务。由于水汽和大气液态水的影响，Ka波段的海洋后向散射测量比Ku波段高度计的信号衰减更大。基于雷达传播理论，给出了一种衰减算法，它是大气压力、温度、水蒸气和液态水含量的函数。由于风和表面重力波之间海-气相互作用的性质，Ka波段短波向散射与风速的关系不同于Ku波段，特别是在中到高风速时。本文提出了一个新的一维风速模型，它只作为后向散射的函数，而一个二维模型，作为后向散射和有效波高的函数，与AltiKa的后向散射测量结果进行了调整。对这些新的Ka波段高度计风速模型的性能进行了评估。
abstractSARAL—the Satellite with ARgos and ALtiKa—is the first satellite radar altimetry mission to fly a Ka-band instrument (AltiKa). Ocean backscatter measurements in the Ka band suffer larger signal attenuation due to water vapor and atmospheric liquid water than those from Ku-band altimeters. An attenuation algorithm is provided, based on radar propagation theory, which is a function of atmospheric pressure, temperature, water vapor, and liquid water content. Because of the nature of the air–sea interactions between wind and surface gravity waves, the shorter wavelength Ka-band backscatter exhibits a different relationship with wind speed than at Ku band, particularly at moderate to high wind speeds. This paper presents a new one-dimensional wind speed model, as a function of backscatter only, and a two-dimensional model, as a function of backscatter and significant wave height, tuned to AltiKa’s backscatter measurements. The performance of these new Ka-band altimeter wind speed models is assessed thr...