欧亚中高纬和青藏高原秋冬积雪异常对中-东亚地区冬春气候年际变率的共同影响

欧亚大陆积雪异常对局地和全球的气候变化都有着重要的影响。由于青藏高原特殊的地形特点，之前的大多数研究是把欧亚大陆中高纬地区积雪和青藏高原积雪视为独立的因子，分别研究它们的气候效应。申请者的初步研究却表明，它们之间存在一定的相互联系。此外，之前关于欧亚大陆积雪的气候效应的研究关注的主要是冬春积雪变化对欧亚中高纬度地区和东亚地区的气候影响，而对欧亚中部地区的影响研究较少。本研究项目拟利用台站观测资料、多种再分析资料和卫星遥感资料，结合统计分析、动力诊断和数值实验等方法研究欧亚中高纬度地区和青藏高原秋冬积雪异常对中-东亚地区（包括中亚和东亚西部地区）冬春气候年际变率的共同影响、相对重要性和不同贡献并揭示其中的关键物理过程。项目的研究结果将有助于加深人们对亚洲季风变异机理的认识，为亚洲季风区短期气候预测提供科学依据。项目研究结果对于增强亚洲季风区的防灾减灾能力也有着重要的实际意义。

The Eurasian snow anomaly can significantly impact on local and global climate variability. Due to the special topographical characteristics of the Qinghai Tibet Plateau, most of the previous studies regarded the snow in the mid- to high-latitudes of Eurasia and the snow in the Qinghai Tibet Plateau as independent factors. However, we found that the snow variation over these two regions has a close relationship. Previous studies investigating the climate effect of Eurasian snow anomalies mainly focused on the regions of middle and high latitudes of Eurasia and East Asia. Less attention has been given to the central Eurasian continent. In this research project, we intend to use station observation data, multiple reanalysis data and satellite remote sensing data, combined with statistical analysis, dynamic diagnosis and numerical models, to investigate the combined influence, relative importance and different contributions of autumn-winter snow anomalies in the mid- to high- latitudes of Eurasia and the snow anomalies in the Qinghai Tibet Plateau on the interannual climate variability over Central-East Asia (including Central Asia and Western East Asia). The research results of the project will help to rich the understanding of the mechanism of Asian monsoon variation. The results can provide scientific basis and prediction methods for the short-term climate prediction over Asia. The research results of the project also have important practical significance for enhancing the capacity of disaster prevention and mitigation in Asia Monsoon region.