Factors contributing to the oxygen concentration over the Qinghai-Tibetan Plateau and its contribution rate calculation

作     者：Peijun SHI Ying ZHANG Yanqiang CHEN Wenquan ZHU Xiaokang HU Heyi YANG Lu JIANG Yonggui MA Haiping TANG 

作者机构：State Key Laboratory of Earth Surface Processes and Resource EcologyBeijing Normal UniversityBeijing100875China Key Laboratory of Environmental Change and Natural DisasterMinistry of EducationBeijing Normal UniversityBeijing100875China The Institute for Disaster Management and ReconstructionSichuan UniversityChengdu610065China Academy of Plateau Science and SustainabilityPeople’s Government of Qinghai Province&Beijing Normal UniversityXining810016China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2024年第67卷第2期

页      面：497-509页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0708[理学-地球物理学] 0706[理学-大气科学] 

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program(Grant Nos.2019QZKK0606&2019QZKK0906)。 

主　　题：Qinghai-Tibetan Plateau Oxygen concentration Relative contribution rate Air temperature Vegetation 

摘      要：A decline in atmospheric oxygen concentration is projected in the 21st century given the background of global warming.The Qinghai-Tibetan Plateau is located at a high altitude,and thus,it faces a hypoxia challenge;however,knowledge of the factors contributing to its atmospheric oxygen concentration is still lacking.Here,we conducted joint observations of ecosystem oxygen production and carbon sinks and near-surface atmospheric oxygen concentrations on the Qinghai-Tibetan Plateau and meteorological elements at Beijing Fangshan Station.Using seasonal differences and statistical methods,we calculated the relative contribution rates of vegetation to changes in atmospheric oxygen concentration.Our results indicate that solar radiation,atmospheric humidity,and ecosystem oxygen consumption and production have a significant impact on the atmospheric oxygen concentration,and the impact shows temporal and spatial differences.Vegetation significantly impacts the oxygen concentration,with a contribution rate of 16.7%–24.5%,which is underestimated in existing research.Our findings provide important insights into the factors that influence atmospheric oxygen concentration and highlight the contribution of vegetation.To better understand the oxygen dynamics of the Qinghai-Tibetan Plateau,we recommend further field observations of soil respiration and vegetation photosynthesis to clarify the contributions of carbon storage,carbon sinks and other factors to the near-surface atmospheric oxygen concentration.