亚欧大陆科学资源管理

We examine the links between the thermal condition of the troposphere over the Tibetan Plateau with theatmospheric circulation and climate over the Eurasian continent. The temperature of the troposphere over theTibetan Plateau is higher than the temperature in other regions at the same latitude and is consistent with thetemperature of the Eurasian troposphere on an interannual timescale. The higher temperature of the troposphereover the Tibetan Plateau leads to anomalous south–north temperature gradients from mid-latitudes over theEurasian continent to its two flanks, accompanied by anomalous easterly and westerly winds in the upper troposphere in the subtropics and at higher latitudes. Anomalous anticyclonic circulations and subsidence motionsappear between the anomalous easterly and westerly winds and contribute to the high surface air temperatureover West Asia, Central Asia and East Asia via anomalous vertical temperature advection in the troposphere andchange in the amount of solar radiation incident on the surface. The enhanced East Asian summer monsoonassociated with the high temperature of the troposphere over the Tibetan Plateau also partly contributes to thehigh surface air temperature over East Asia via horizontal temperature advection. The westerly wind anomaliesin the north of the mid-latitudes over the Eurasian continent indicate the enhancement and northward shift ofthe mid-latitude westerly jet. This is related to anomalous upward motion and higher precipitation in NortheastChina and North China. Sensitivity experiments based on an atmospheric model verify the impact of anomaloustropospheric heating over the Tibetan Plateau in summer on the atmospheric circulation over the Eurasian continent.