气候变化领域集成服务门户(CCPortal): Changes in Below-Cloud Evaporation Affect Precipitation Isotopes During Five Decades of Warming Across China

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DOI	10.1029/2020JD033075
	Changes in Below-Cloud Evaporation Affect Precipitation Isotopes During Five Decades of Warming Across China
	Wang S.; Jiao R.; Zhang M.; Crawford J.; Hughes C.E.; Chen F.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	Based on daily meteorological records for 651 sites across China during the period 1960–2018, we estimated the changes in isotopic variations in raindrops as they descend from cloud base to ground over past decades, and tested the sensitivity of isotopic variations to climate parameters like air temperature and relative humidity. Air temperature correlates positively and relative humidity correlates negatively with below-cloud isotopic variation. Generally, the below-cloud evaporation effect on precipitation isotopes in the arid and semi-arid regions of China is much greater than that in the humid and semi-humid regions, although the impact might be reduced under cold-arid or hot-humid conditions. With aridity increasing with distance from the coast, the continental effect of precipitation isotopes is modified due to the below-cloud evaporation. The seasonal pattern of the measured isotopic composition in precipitation near the ground and estimated at cloud base, is still similar in most regions, although the seasonal range is higher at the ground. During the last five decades, the below-cloud evaporation effect has enhanced for the cold and arid regions of China especially across Qinghai-Tibet Plateau and Inner Mongolia, due to combined effects of increasing air temperature and decreasing relative humidity. Although the below-cloud evaporation effect is not always the dominant factor influencing the variability of stable isotopes, it needs to be considered as one of the contributing factors. This enhanced effect may impact the interpretation of past climate based on stable water isotopes, particularly in paleoclimate studies using speleothems and tree rings. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Below-cloud evaporation; China; climate change; precipitation; stable isotopes
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185352
作者单位	College of Geography and Environmental Science, Northwest Normal University, Lanzhou, China; Key Laboratory of Resource Environment and Sustainable Development of Oasis, Gansu Province, Northwest Normal University, Lanzhou, China; Australian Nuclear Science and Technology Organisation, Kirrawee DC, NSW, Australia
推荐引用方式 GB/T 7714	Wang S.,Jiao R.,Zhang M.,et al. Changes in Below-Cloud Evaporation Affect Precipitation Isotopes During Five Decades of Warming Across China[J],2021,126(7).
APA	Wang S.,Jiao R.,Zhang M.,Crawford J.,Hughes C.E.,&Chen F..(2021).Changes in Below-Cloud Evaporation Affect Precipitation Isotopes During Five Decades of Warming Across China.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Wang S.,et al."Changes in Below-Cloud Evaporation Affect Precipitation Isotopes During Five Decades of Warming Across China".Journal of Geophysical Research: Atmospheres 126.7(2021).