青藏高原山体效应对近地表层垂直大气昼夜温差的影响  

Influence of mass elevation effect on diurnal atmospheric temperature differences in the near-surface layer over Qinghai-Tibet Plateau

作　　者：张文杰 张百平[2] 赵芳[3,4] 唐晓鹿[5] 高昂 李午阳[3] 兰鑫灿 唐家乐 ZHANG Wenjie;ZHANG Baiping;ZHAO Fang;TANG Xiaolu;GAO Ang;LI Wuyang;LAN Xincan;TANG Jiale(School of Geographical Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;College of Geography and Environmental Science,Henan University,Kaifeng 475004,Henan,China;Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions(Henan University),Ministry of Education,Kaifeng 475004,Henan,China;College of Ecology and Environment,Chengdu University of Technology,Chengdu 610059,China;China National Institute of Standardization,Beijing 100191,China)

机构地区：[1]南京信息工程大学地理科学学院,南京210044 [2]中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京100101 [3]河南大学地理与环境学院,开封475004 [4]黄河中下游数字地理技术教育部重点实验室,开封475004 [5]成都理工大学生态环境学院,成都610059 [6]中国标准化研究院,北京100191

出　　处：《地理研究》2023年第3期713-727,共15页Geographical Research

基　　金：国家自然科学基金项目(42201053、41601091);资源与环境信息系统国家重点实验室开放基金项目;中国南北过渡带综合科学考察项目(2017FY100900)。

摘　　要：青藏高原巨大隆起不仅塑造了欧亚大陆的气候格局,也深远地影响了高原的地理生态格局。青藏高原巨大隆起而产生的山体效应不仅可对近地表温度产生显著影响,其对近地表层垂直大气亦可产生显著作用,然而目前仍缺乏这一方面的研究。因此,本研究基于MODIS大气廓线数据产品,以昼夜温差为切入点,分析了青藏高原不同季节、不同气压面(500~200hPa)的昼夜温差差异。结果表明:①青藏高原内部不同季节、不同气压面高度处的昼夜温差均大于外部地区,整体符合山体效应的格局。②青藏高原海拔越高,不同季节的垂直层昼夜温差越大。③随着气压面高度的增加(500~200 hPa),海拔对冬季大气昼夜温差的影响逐渐降低,对春季、夏季和秋季的影响程度先升高后降低,作用最大处分别出现在300 hPa、250 hPa和300 hPa。The towering Tibetan Plateau not only shaped the climatic patterns of the Eurasian continent,but also profoundly influenced the geo-ecological patterns of the plateau.The mass elevation effect(MEE)of the massive uplift of the Tibetan Plateau not only has a significant effect on near-surface temperatures,but also on the vertical atmosphere,yet there is still a lack of research in this area.MODIS atmospheric profile data product(MOD07_L2)provides air temperature data for 20 pressure surface layers in high spatial resolution(5 km*5 km),which provides a new perspective for estimating temperature variations in and outside the mountains/plateau and offers the basis to study the impact of MEE on the vertical atmosphere in different seasons.Therefore,this study analyses the diurnal temperature range(DTR)among different seasons and different pressure heights(500-200 hPa)on the Tibetan Plateau and its surroundings based on MOD07_L2.In order to explain the mechanism behind this,this paper examines the seasonality of the relationship between altitude,solar radiation and DTR at different pressure heights respectively.The results show that:(1)DTR at different seasons and different pressure heights(500-200 hPa)on the Tibetan Plateau is greater than that of the external areas,which is overall consistent with the pattern of mass elevation effect.(2)The higher altitude on the Tibetan Plateau,the greater DTR in the vertical layer in different seasons.(3)The control of altitude on DTR in winter gradually decreases as the pressure height increases(500-200 hPa),and the degree of influence on spring,summer and autumn first increases and then decreases,with the greatest influence occurring at 300 hPa,250 hPa and 300 hPa,respectively.In this study,the pressure surface of 500-200 hPa on and around the Tibetan Plateau,which is usually higher than the near-surface elevation,is theoretically able to reduce the uncertainty caused by the influence of the substratum of the plateau and local climatic conditions on DTR.The DTR on the pressure sur

关 键 词：青藏高原 昼夜温差 不同季节 不同气压面高度 山体效应 MODIS 

分 类 号：P461[天文地球—大气科学及气象学]