摘要
利用青海湖风云卫星"湖-海"协同观测试验的漂流观测仪数据,分析青海湖水温与气温的变化特征及相关性,并结合青海湖周边自动气象站资料,分析湖陆气温变化特征的差异.研究结果表明:青海湖水温与气温存在一定的相关性,其分钟值的相关系数为0.71,日均值的相关系数为0.73,水温与气温日变化均呈单峰型,升降阶段基本相同,但水温日变化的幅度明显小于气温,且下降时间要早于气温;青海湖湖面气温与陆面气温同样存在着相关性,二者的发展变化趋势是一致的,但日变化存在一定的错峰现象,陆面气温的峰值是提前的,而谷值是滞后的.
Abstract
Lakes are important parts of land water resources,and their surface water temperatures are the most sensitive and rapid response to climate and environmental changes.An accurate understanding of their changing characteristics is highly important for analysing and understanding global climate change and improving the ecological environment of lakes.In July 2022,the Meteorological Observation Centre of China Meteorological Administration and the National Satellite Meteorological Centre jointly deploy drift buoys at the China Radiometric Calibration Site of remote sensing satellite(CRCS)to carry out the Fengyun Satellite"lake-sea"cooperative observation experiment.Two sets of drift buoys are deployed on the line from Haixin Mountain to the southeast of Lake Qinghai.In this paper,we use data from the drift buoy from 10 July to 30 September,2022,combined with data from four sets of automatic meteorological stations on the land around Lake Qinghai,to analyse the characteristics and correlations between the changes of water temperature and air temperature in Lake Qinghai,and the differences in the characteristics of the changes of air temperature on the lake and land.To ensure the reasonableness of the test data,quality control of the test data is conducted,including spatial consistency checks,climatological threshold checks and temporal consistency checks,and a total of 13488 sets of water temperature data and 20232 sets of air temperature data are screened out.The analysis results of the above data indicate that there is a certain correlation between water temperature and air temperature in Lake Qinghai,the correlation coefficient of the minute value is 0.71,and the correlation coefficient of the daily mean value is 0.73.The diurnal variations of water temperature and air temperature are unimodal,and the rising and falling stages are basically the same;however,the diurnal variations of water temperature are obviously smaller than those of air temperature,and the decreasing time is earlier than that of air temperature.The diurnal variations in lake and land air temperatures exhibit a certain off-peak phenomenon,the peak land air temperature is advanced,and the valley value is lagging.The factors influencing the correlation between air and water temperatures are diverse and are related not only to subsurface characteristics and the distance from the observation location but also to solar and surface radiation.The contributions of multisource observational data,such as total radiation,shortwave radiation,cloud remote sensing products and high-resolution satellite observations,to the difference between air and water temperatures are analysed during the day and night and in different seasons in future work.The study of the difference between air and water temperatures can provide technical support for analysing heat exchanges between the lake and the atmosphere of Lake Qinghai.
维普
万方数据