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首页> 外文期刊>Meteorological applications >Evaluation of Doppler weather radar MEGHA-2700 observations using Gematronik Doppler weather radar and TRMM Precipitation Radar
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Evaluation of Doppler weather radar MEGHA-2700 observations using Gematronik Doppler weather radar and TRMM Precipitation Radar

机译：使用Gematronik多普勒天气雷达和TRMM降水雷达评估多普勒天气雷达MEGHA-2700的观测结果

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摘要

As a part of the MEGHA-2700 validation after programme, Doppler weather radar (DWR) at Sriharikota (13.66 degrees N, 80.23 degrees E) is validated with the Chennai (13.07 degrees N, 80.28 degrees E DWR) (hereafter CHENNAI-DWR) and simultaneous observations along with Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) measurements. Many simultaneous observations of weather systems were carried out using these two DWRs with an aim of validating the MEGHA-2700. During this validation period, a tropical cyclone 'OGNI' formed in the Bay of Bengal on 28 October 2006. Simultaneous observations from these two radars are used for the present study along with TRMM-PR measurements. A methodology is developed to interpolate two ground radars and PR volume scans into a fixed Cartesian grid box because the common volume observations minimize uncertainties associated with the sampling volumes and viewing angles. It is observed that MEGHA-2700 systematically underestimates CHENNAI-DWR reflectivity by similar to 6.23 dB. The rainfall estimations from MEGHA-2700 show that the bias adjustment reduces the total rainfall differences significantly between radar estimates and rain gauges. The significance of the present study lies in validating the indigenously developed DWR, which will form the basis for further research on cloud microphysics.
机译：作为计划之后的MEGHA-2700验证的一部分，斯里哈里科塔（北纬13.66度，东经80.23度）的多普勒天气雷达（DWR）已通过钦奈（北纬13.07度，东经80.28度）进行了验证（以下称CHENNAI-DWR）同步观测以及热带雨量测量任务（TRMM）降水雷达（PR）的测量。为了验证MEGHA-2700，使用这两个DWR对天气系统进行了许多同时观测。在此验证期内，2006年10月28日在孟加拉湾形成了热带气旋“ OGNI”。本研究使用这两个雷达的同步观测以及TRMM-PR测量。开发了一种将两个地面雷达和PR体积扫描插值到固定笛卡尔网格框中的方法，因为共同的体积观测可以最大程度地减少与采样体积和视角相关的不确定性。可以观察到，MEGHA-2700系统地低估了CHENNAI-DWR的反射率，约为6.23 dB。来自MEGHA-2700的降雨量估算表明，偏差调整可显着减少雷达估算值与雨量计之间的总降雨量差。本研究的意义在于验证本地开发的DWR，这将成为进一步研究云微物理学的基础。

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