近日，中国科学院西北生态环境资源研究院高晓清及其团队人员在研究青藏高原夏季大气热机效率和热源特征中取得新进展。该项研究成果发表在2023年12月15日出版的《中国科学：地球科学》上。

研究团队利用MOD08和ERA5再分析数据，计算了2000-2020年夏季(5-9月)青藏高原的大气热机效率、地表热源和大气热源。2000-2020年夏季青藏高原大气热机效率平均值在1.2%-1.5%之间，小于1.6%；夏季热机效率高于6、7、8月热机效率；柴达木盆地是大气热机效率最高的地区，青藏高原西部次之。

2000-2020年夏季青藏高原平均地表热源为96.0 W m^-2、大气热源为90.7 W m^-2，降水凝结潜热的释放是夏季青藏高原大气热源的重要组成部分。夏季高原大气热机效率与地表热源呈显著正相关关系。降水凝结潜热是夏季大气热源的重要组成部分，可以反映降水过程。夏季高原大气热机效率与大气热源呈显著的负相关关系。

据了解，陆空系统中有许多类型的大气热机。大气热机效率的准确定义、计算和解释是理解陆空系统能量传递和转化的关键。夏季青藏高原(QTP)上空的大气可以看作是一个正热机。热机效率的研究有助于更好地理解青藏高原的陆空相互作用和热力过程。这也为解释青藏高原对中国、东亚乃至全球气候的影响提供了一个新的视角。

附：英文原文

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

Author: Yujie LI, Xiaoqing GAO, Yaoming MA, Zeyong Hu, Zhenchao Li, Liwei YANG, Xiao JIN, Xiyin ZHOU

Issue&Volume: 2023-12-15

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 condensation 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 atmospheric heat source on the QTP in summer.

DOI: 10.1007/s11430-023-1212-3

Source: https://www.sciengine.com/10.1007/s11430-023-1212-3