基于地基微波辐射计遥感的天津大气水汽和液态水特征

doi:10.3969/j.issn.1673-503X.2019.06.006

Abstract

Abstract: The characteristics of atmospheric water vapor and liquid water in Tianjin were analyzed using the observation data from 35 channel microwave radiometers at Xiqing district from March 2013 to February 2017.The results show that daily variation trends of water vapor and liquid water over the Tianjin region are basically the same during the four seasons.The diurnal variation characteristics are unimodal,with the largest in summer,the second in autumn,and the smallest in winter.The probability that the maximum value of the integrated water vapor during each season appears at 23:00-00:00 (Beijing time,the same below) is significantly greater than that at other times.The probability that the maximum value of the integrated liquid water in summer and winter appears at 14:00 is the highest,and the probability that appears at 10:00 in spring and at 13:00 in autumn is the highest.The water vapor density over Tianjin decreases gradually from the ground to 3.5 km.The decreasing gradient increases successively from summer to autumn,spring and winter.The diurnal variation is not significant from 1.5 km to 3.5 km in each season.The diurnal variation curve of the average water vapor density shows a bimodal pattern below the height of 1 km in spring,summer and autumn,and its main peak value appears at around 08:00,11:00 and 12:00,respectively.In winter,there is a single peak type change.The peak area appears between 12:00 and 16:00.The density of liquid water varies with the height of stratification.In summer,the high-density region of liquid water (0.08-0.14 g·m^-3) is between 5-6 km,and its maximum value occurs between 18:00 and 20:00.The high-value areas of liquid water density in autumn,spring and winter are between 1.5-3.5 km,and the value decreases successively.The maximum value of liquid water density in spring and winter is around 05:00,while that in autumn is around 02:00.In addition,the variation trend of water vapor and liquid water in Tianjin is basically the same as those of temperature and precipitation.The water vapor is positively correlated with temperature except for the time from 06:00 to 18:00 in summer and part of the time in winter.Liquid water has a poor correlation with temperature,but a positive correlation with precipitation.Throughout the whole year,liquid water has a greater correlation with precipitation at night than during the day.

Key words: Microwave radiometer, Water vapor, Liquid water

CLC Number:

P426

CHEN Shu-cheng, SHI Jing, WANG Yan, LI Xiao-bo, CUI Ming. Characteristics of atmospheric water vapor and liquid water over Tianjin identified by remote sensing data from ground-based microwave radiometer[J]. Journal of Meteorology and Environment, 2019, 35(6): 38-45.

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Characteristics of atmospheric water vapor and liquid water over Tianjin identified by remote sensing data from ground-based microwave radiometer

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