【摘要】 我国第二代极轨气象卫星的第三颗星——风云三号C星(FY-3C)已于2013年9月发射.为探讨微波湿温探测仪大气探测通道对大气参数的探测能力,采用威斯康星大学的非流体静力学中尺度模式系统(UW-NMS)模拟Katrina飓风的基础数据集,结合微波辐射传输模式,正演模拟分析了微波湿温探测仪118 GHz和183 GHz通道的辐射特性.仿真结果表明118 GHz和183 GHz通道作为星载亚毫米波大气探测通道,能够提供更加精细的大气温度和湿度廓线信息;冰态粒子的散射作用可使(118.75±5.0)GHz和(183.31±7.0)GHz通道亮温分别下降108 K和76 K,新增的探测频点和通道能提升对云雨大气的探测能力;118 GHz和183 GHz通道亮温对云中各种水凝物粒子响应的模拟分析结果证明了这两组通道在云中水凝物分布特性反演方面的潜在探测能力;大气中雨水含量的增加可以导致(118.75±5.0)GHz通道亮温下降4.5 K,118 GHz对液态粒子特有的响应能力,显示了其作为降水反演频点的优势;大气中雪粒子含量的增加会使(118.75±5.0)GHz通道亮温下降10 K,可利用该通道探测云中的雪晶含量.更多还原

【Abstract】 The third satellite of new generation polar orbit meteorological satellite of China(FY-3C) was successfully launched on September 2013.In order to analyze the capability of the microwave humidity and temperature sounder’s sounding channels in atmospheric parameters detection,the basic atmospheric parameters data of Katrina provided by the"University of Wisconsin-Non-hydrostatic Model System"(UW-NMS) were combined with the microwave radiative transfer model to simulate the radiometric characteristics of 118 GHz and 183 GHz.The results show that fine structure of atmosphere humidity and temperature profile can be achieved by using 118 GHz and 183 GHz which are the millimetersubmillimeter sounding channels.The brightness temperature of(118.75 ± 5.0) GHz and(183.31 ± 7.0) GHz decrease about 108 K and 76 K,respectively,due to the scattering of frozen hydrometeors.This result indicates that these channels data can be used to detect the cloudy atmosphere.The different kinds of hydrometeors can significantly affect the brightness temperature of 118 GHz and 183 GHz channels and it will be used in hydrometeors retrieval.When mixing ratios of rain drops increase,only the brightness temperature of(118.75 ± 5.0) GHz decreases about 4.5 K.The responsiveness reveals that 118 GHz is an important band for precipitation retrieval.The brightness temperature of(118.75 ±5.0)GHz decreases about 10 K when mixing radio of snow at middle layers increase.This result shows the channel can be used to detect the snow particle.更多还原