Evolution of Surface Sensible Heat over the Tibetan Plateau Under the Recent Global Warming Hiatus

摘要

Based on regular surface meteorological observations and NCEP/DOE reanalysis data,this study investigates the evolution of surface sensible heat (SH) over the central and eastern Tibetan Plateau (CE-TP) under the recent global warming hiatus.The results reveal that the SH over the CE-TP presents a recovery since the slowdown of the global warming.The restored surface wind speed together with increased difference in ground-air temperature contribute to the recovery in SH.During the global warming hiatus,the persistent weakening wind speed is alleviated due to the variation of the meridional temperature gradient.Meanwhile,the ground surface temperature and the difference in ground-air temperature show a significant increasing trend in that period caused by the increased total cloud amount,especially at night.At nighttime,the increased total cloud cover reduces the surface effective radiation via a strengthening of atmospheric counter radiation and subsequently brings about a clear upward trend in ground surface temperature and the difference in ground-air temperature.Cloud-radiation feedback plays a significant role in the evolution of the surface temperature and even SH during the global warming hiatus.Consequently,besides the surface wind speed,the difference in ground-air temperature becomes another significant factor for the variation in SH since the slowdown of global warming,particularly at night.