文章摘要
台风天气条件下地基微波辐射计反演产品精度分析
Accuracy analysis of ground-based microwave radiometer retrieval products under typhoon weather conditions
投稿时间:2021-07-29  修订日期:2021-12-20
DOI:
中文关键词: 微波辐射计  GPS探空  台风  温湿廓线  
英文关键词: microwave radiometer  GPS sounding  typhoon  temperature and humidity profile  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
骆梦洁 东华大学 201600
汤杰 中国气象局上海台风研究所 200030
陈叙捷 霞浦县气象局 355100
陈勇航 东华大学 201600
赵兵科 中国气象局上海台风研究所 200030
史文浩 东华大学 201600
严嘉明 中国气象局上海台风研究所 200030
刘统强 东华大学 201600
林立旻 中国气象局上海台风研究所 200030
陈泉 东华大学 201600
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中文摘要:
   利用中国气象局上海台风研究所台风实验获取的4个典型台风个例数据,对地基微波辐射计反演的温度、水汽密度廓线与同址GPS探空资料得到的廓线进行对比分析,发现二者的温度、水汽密度相关系数分别为0.988、0.928。微波辐射计的探测精度在不同高度上有很大差异,整体来说,在高层温度探测精度较优于低层,而在低层水汽密度探测精度较优于高层。进一步研究表明,探测水汽密度精度与降水强度存在显著的正相关性,而与风速及相对台风位置没有明显的关系。经计算,21组水汽密度廓线均方根误差与对应时段降雨强度的相关系数为0.912。本研究定量化地展示了微波辐射计在台风天气条件下对温度的探测精度相对比较高,且水汽密度的观测质量有一定的可靠性和可用性,这一研究将为今后将微波辐射计用于观测台风、锋面等强对流天气系统的大气温度湿度结构提供可靠性依据。
英文摘要:
   In this paper, the temperature and water vapor density profiles retrieved by ground-based microwave radiometer are compared with those obtained by GPS sounding data at the same site, using the data of four typical typhoon cases obtained by typhoon experiment of Shanghai Typhoon Research Institute of China Meteorological Administration. It is found that the correlation coefficients of temperature and water vapor density are 0.988 and 0.928 respectively. The detection accuracy of microwave radiometer varies greatly at different heights. On the whole, the detection accuracy of temperature in the upper layer is better than that in the lower layer, while the detection accuracy of water vapor density in the lower layer is better than that in the upper layer. Further research shows that there is a significant positive correlation between the accuracy of detecting water vapor density and precipitation intensity, but it has no obvious relationship with wind speed and relative typhoon position. After calculation, the correlation coefficient between the root mean square error of 21 groups of water vapor density profiles and the rainfall intensity in the corresponding period is 0.912. This study quantitatively shows that the detection accuracy of microwave radiometer for temperature under typhoon weather conditions is relatively high, and the observation quality of water vapor density has certain reliability and availability. This study will provide a reliable basis for the observation of atmospheric temperature and humidity structure of strong convective weather systems such as typhoons and fronts in the future.
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