globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3324-z
Scopus记录号: 2-s2.0-84983383774
论文题名:
The effect of preceding wintertime Arctic polar vortex on springtime NDVI patterns in boreal Eurasia, 1982–2015
作者: Li J.; Fan K.; Xu J.; Powell A.M.; Jr.; Kogan F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期:2017-01-02
起始页码: 23
结束页码: 35
语种: 英语
英文关键词: Arctic polar vortex intensity ; Boreal Eurasia ; NDVI ; Non-simultaneous
英文摘要: The polar vortex is implicated in certain cold events in boreal Eurasia and has a further influence on land surface properties (e.g., vegetation and snow) during spring. The Normalized Difference Vegetation Index (NDVI) can be used as a proxy of land surface responses to climate changes to a certain degree. In this study, we demonstrate the significant correlation between preceding wintertime Arctic polar vortex intensity (WAPVI) and springtime NDVI (SNDVI) over a 34-year period (1982–2015) in boreal Eurasia (50°–75°N, 0°–150°E). Results show that a positive phase of WAPVI tends to increase the SNDVI in Europe and Lake Baikal, but causes a significant decrease in Siberia; the physical mechanisms involved in this relationship are then investigated. A positive phase of WAPVI leads to anomalies in surface air temperature and rainfall over Eurasia, which then induces a significant decrease in snow cover and snow depth in Europe and Lake Baikal and an increase of snow depth in Siberia. The colder ground temperature in Siberia during spring is considered responsible for the stronger snow depth and weaker vegetation growth in this region. The weaker and thinner snow cover in Europe and Baikal produces a decrease in albedo and an increase in heat. Thin snow melts fast in the following spring and land releases more heat to the atmosphere; consequently, warm and moist land surface facilitates vegetation growth in Europe and the Baikal regions during positive WAPVI years. In addition, WAPVI can induce sea surface temperature (SST) anomalies in the North Atlantic, which displays a tripole pattern similar to that of the empirical mode pattern in winter. Furthermore, the SST anomalous pattern persisting from winter to spring can trigger a stationary wave-train propagating from west to east in boreal Eurasia, with “negative–positive–negative–positive” geopotential height anomalies, which further exerts an impact on vegetation growth through modulation of the heat balance. © 2016, Springer-Verlag Berlin Heidelberg.
资助项目: NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53183
Appears in Collections:过去全球变化的重建

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作者单位: Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Center for Satellite Applications and Research (STAR), NOAA/NESDIS, College Park, MD, United States; University of Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Li J.,Fan K.,Xu J.,et al. The effect of preceding wintertime Arctic polar vortex on springtime NDVI patterns in boreal Eurasia, 1982–2015[J]. Climate Dynamics,2017-01-01,49(2017-01-02)
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