The Role of Soil Moisture Feedbacks in Future Summer Temperature Change over East Asia
The Role of Soil Moisture Feedbacks in Future Summer Temperature Change over East Asia
复制标题
水分反馈在东亚未来夏季气温变化中的作用
DOI：
10.1029/2018jd029670
复制
发表时间：
2019-11-28
影响因子：
4.4
通讯作者：
Wu, Lingyun
中科院分区：
文献类型：
--
作者：
Li, Kai;Zhang, Jingyong;Wu, Lingyun
在全球变暖的背景下，平均温度和温度变率的增加会对人类和自然系统产生许多不利影响。然而，土壤湿度-大气相互作用如何影响东亚未来的气候变化仍不清楚。本文利用社区气候系统模式-天气研究与预报（CCSM-WRF）模式系统进行长期区域气候模拟，探讨土壤水分反馈在东亚地区未来夏季地表气温变化中的作用。结果表明，在代表性浓度路径8.5 （RCP8.5）情景下，预计到21世纪末东亚大部分地区夏季地面气温和降水将增加。土壤水分反馈导致夏季平均气温升高0.5情景。土壤水分反馈引起的区域平均年际温度变率总体上显著增强。由于地表热和大气边界层对干异常的响应强于湿异常，导致东亚重点地区夏季地表气温的土壤水分反馈具有明显的干湿不对称性。
The increased mean temperature and temperature variability under global warming can have many adverse impacts on human and natural systems. However, how soil moisture-atmosphere interaction can affect future climate change over East Asia remains largely unclear. We use long-term regional climate simulations with the Community Climate System Model-Weather Research and Forecasting (CCSM-WRF) model system to investigate the role of soil moisture feedbacks in future summer surface air temperature change over East Asia. Results show that summer surface air temperature and precipitation are projected to increase over most of East Asia by the end of 21st century under the Representative Concentration Pathway 8.5 (RCP8.5) scenario. Soil moisture feedbacks lead to an increased summer mean temperature of 0.15 degrees C averaged over East Asia, with key regions appearing over the northern part of Tibetan Plateau, Sichuan Basin, and the middle and lower reaches of the Yangtze River Basin during 2071-2100 under the RCP8.5 scenario. And regionally averaged interannual temperature variability induced by soil moisture feedbacks is substantially enhanced as a whole. Regarding the spatial distribution, soil moisture feedbacks on interannual temperature variability are projected to strengthen notably over the northern part of Tibetan Plateau, the Hexi Corridor, and Sichuan Basin and weaken over the south Tibetan Plateau, southeast China, and the areas surrounding the Lake Baikal. The stronger responses of surface heat and the atmospheric boundary layer to dry anomalies than wet anomalies lead to an obvious dry-wet asymmetry of soil moisture feedbacks on summer surface air temperature over the key areas of East Asia.