Study on the atmospheric heat engine efficiency and heat source characteristics of the Qinghai-Tibet Plateau in summer

Yujie LI ¹Xiaoqing GAO ²Yaoming MA ³Zeyong HU ²Zhenchao LI ²Liwei YANG ²Xiao JIN ²Xiyin ZHOU⁴

扫码查看

作者信息

1. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions of Chinese Academy of Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Tianjin Key Laboratory for Oceanic Meteorology,Tianjin Institute of Meteorological Science,Tianjin 300074,China
2. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions of Chinese Academy of Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
3. Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100049,China
4. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions of Chinese Academy of Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China
折叠

Abstract

There are many types of atmospheric heat engines in land-air systems.The accurate definition,calculation and interpretation of the efficiency of atmospheric heat engines are key to understanding energy transfer and transformation of land-air systems.The atmosphere over the Qinghai-Tibet Plateau(QTP)in summer can be regarded as a positive heat engine.The study of the heat engine efficiency is helpful to better understand land-air interaction and thermal-dynamic processes on the QTP.It also provides a new perspective to explain the impact of the QTP on the climate of China,East Asia and even the world.In this paper,we used MOD08 and ERA5 reanalysis data to calculate the atmospheric heat engine efficiency,surface heat source and atmospheric heat source on the QTP in summer(May to September)from 2000 to 2020.The average atmospheric heat engine efficiency on the QTP in summer from 2000 to 2020 varies between 1.2％and 1.5％,which is less than 1.6％;the heat engine efficiency in summer is higher than that in June,July and August;the Qaidam Basin is the region with the highest atmospheric heat engine efficiency,followed by the western QTP.The mean surface heat source on the QTP in summer from 2000 to 2020 is 96.0 W m-2,the atmospheric heat source is 90.7 W m-2,and the release of precipitation condensation latent heat is the most important component of the atmospheric heat source on the QTP in summer.There is a strong and significant positive correlation between the atmospheric heat engine efficiency and the surface heat source on the QTP in summer.The precipitation con-densation latent heat is the most important component of the atmospheric heat source in summer and can reflect the precipitation process.There is a strong and significant negative correlation between the atmospheric heat engine efficiency and the atmo-spheric heat source on the QTP in summer.

Key words

Qinghai-Tibet Plateau/Climate change/Land-air system/Atmospheric heat engine/Heat source on the Qinghai-Tibet Plateau

引用本文复制引用

基金项目

National Aeronautics and Space Administration(NASA)for the MOD08 data()

Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK010303)

Numerical Simulation of the Effect of Soil Temperature on Precipitation Prediction(QHMS2019015)

出版年

2024

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

参考文献量3

段落导航