Tibetan Plateau warming and precipitation changes in East Asia
Tibetan Plateau warming and precipitation changes in East Asia
复制标题
DOI：
10.1029/2008gl034330
复制
发表时间：
2008-07
影响因子：
5.2
通讯作者：
Bin Wang;Q. Bao;B. Hoskins;Guoxiong Wu;Yimin Liu
中科院分区：
文献类型：
--
作者：
Bin Wang;Q. Bao;B. Hoskins;Guoxiong Wu;Yimin Liu
这里提供的观测证据表明，青藏高原 (TP) 的表面温度在过去 50 年中增加了约 1.8°C。由于变暖而预计的降水模式类似于东亚 (EA) 降水变化的主要模式。大气环流模型数值实验表明，青藏高原气温升高引起的大气加热可以增强东亚副热带锋面降水。研究发现，这种联系的机制是通过两个不同的罗斯贝波列和青藏高原以东的等熵隆起，使西太平洋副热带高压变形并增强了向东亚区副热带锋面的水汽辐合。模型计算表明，过去青藏高原气温的变化与东亚地区夏季降水可能存在联系，预计未来高原气温的上升可能会导致东亚地区夏季锋面降水进一步增加。
Observational evidence presented here indicates that the surface temperatures on the Tibetan Plateau (TP) have increased by about 1.8°C over the past 50 years. The precipitation pattern that is projected as a result of this warming resembles the leading pattern of precipitation variations in East Asia (EA). Numerical experiments with atmospheric general circulation models show that atmospheric heating induced by the rising TP temperatures can enhance East Asian subtropical frontal rainfall. The mechanism of the linkage is found to be through two distinct Rossby wave trains and the isentropic uplift to the east of the TP, which deform the western Pacific Subtropical High and enhance moisture convergence toward the EA subtropical front. The model calculations suggest that the past changes in TP temperatures and EA summer rainfall may be linked, and that projected future increases in TP temperatures may lead to further enhanced summer frontal rainfall in EA region.