The Impact of Surface Scattering on Ocean Atmospheric Boundary Layer (ABL) Wind Profile Estimates from an Airborne Doppler Radar

IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium Pub Date : 2008-07-07 DOI:10.1109/IGARSS.2008.4779656

T. Chu, S. Frasier, D. Esteban-Fernandez, P. Chang, J. Carswell

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引用次数: 1

Abstract

IWRAP, the Imaging Wind and Rain Airborne Profiler is a conically scanning dual-band (C and Ku), dual-polarized pencil-beam airborne Doppler radar that profiles the volume reflectivity and Doppler velocity from precipitation. It also measures the ocean backscatter response especially during tropical and extra tropical cyclones. IWRAP is designed to measure troposphere winds and surface winds. Of particular importance to the storm forecasting and research community are the winds in the lower part of the hurricane boundary layer near the sea surface (lower ABL). The covariance data processing technique IWRAP traditionally employed assumes a uni-modal and symmetric Doppler spectrum and therefore, it alone is unable to account properly for the influence of the surface scattering on wind profiles in the lower ABL region. In this paper we compare covariance-based approaches and full-spectral approaches utilized to derive the true wind speed for atmospheric vertical profiles. Techniques for removal of the surface contamination and example of wind profiles retrieved from Hurricane Rita are presented.

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地面散射对机载多普勒雷达估算海洋大气边界层风廓线的影响

IWRAP是一种锥形扫描双频(C和Ku)双偏振铅笔波束机载多普勒雷达，用于绘制降水的体积反射率和多普勒速度。它还测量海洋的后向散射响应，特别是在热带和热带外气旋期间。IWRAP旨在测量对流层风和地面风。对风暴预报和研究界特别重要的是靠近海面的飓风边界层下部的风(lower ABL)。传统的IWRAP采用的协方差数据处理技术假设了单峰对称的多普勒频谱，因此，它本身不能很好地解释地表散射对下ABL区域风廓线的影响。在本文中，我们比较了基于协方差的方法和用于导出大气垂直剖面真实风速的全谱方法。介绍了去除表面污染的技术，并举例说明了从丽塔飓风中提取的风廓线。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium

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