A climatological northern boundary index for the East Asian summer monsoon and its interannual variability

被引:0
作者
CHEN Jie [1 ]
HUANG Wei [1 ]
JIN LiYa [1 ,2 ]
CHEN JianHui [1 ]
CHEN ShengQian [1 ]
CHEN FaHu [1 ,3 ]
机构
[1] Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University
[2] School of Atmospheric Sciences, Chengdu University of Information Technology
[3] Key Laboratory of Alpine Ecology and Biodiversity (LAEB), Tibetan Plateau Earth Sciences of the Chinese Academy of Sciences
基金
中国国家自然科学基金;
关键词
East Asian summer monsoon; Climatological northern boundary index; Interannual change; Spatial fluctuations;
D O I
暂无
中图分类号
P425.42 [];
学科分类号
0706 ; 070601 ;
摘要
A long-term perspective on the spatial variation of the northern boundary of the East Asian summer monsoon(EASM) and the related physical mechanisms is important for understanding past climate change in Asia and for predicting future changes. However, most of the meteorological definitions of the EASM northern boundary do not correspond well to the actual geographical environment, which is problematic for paleoclimatic research. Here, we use monthly CMAP and GPCP precipitation data to define a new EASM northern boundary index by using the concept of the global monsoon, which is readily applicable to paleoclimatic research. The results show that the distribution of the 2 mm day-1precipitation isoline(i.e., 300 mm precipitation)has a good relationship with the spatial distribution of modern land cover types, the transitional climate zone and the potential natural vegetation types, in China. The locations of the precipitation isolines also correspond well to the locations of major shifts in wind direction. These results suggest that the 2 mm day-1isoline has a clear physical significance since the climatic, ecological,and geographical boundary can be used as the northern boundary index of the EASM(which we call the climatological northern boundary index). The index depicts the northeast-southwest orientation of the climatological(1981-2010) EASM northern boundary, along the eastern part of the Qilian Mountains-southern foothills of the Helan Mountains-Daqing Mountains-western margin of the Greater Khingan Range, from west to east across Northwest and Northeast China. The interannual change of the EASM northern boundary from 1980 to 2015 covers the central part of Gansu, the northern part of Ningxia, the eastern part of Inner Mongolia and the northeastern region in China. It can extend northward to the border between China and Mongolia and retreat southward to Shangdong-central Henan. There is a 200-700 km fluctuation range of the interannual EASM northern boundaries around the locations of the climatological northern boundary. In addition, the spatial variation of the interannual EASM northern boundaries gradually increases from west to east, whereas the trend of north-south fluctuations maintains a roughly consistent location in different regions.
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页码:13 / 22
页数:10
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