Empirical Relationships of Sea Surface Temperature and Vegetation Activity with Summer Rainfall Variability over the Sahel*

Earth Interactions

YaqianHe¹ 

关键词: Normalized difference vegetation index;    Sea surface temperature;    Sahel;    Summer rainfall;    Granger causality;   

DOI  :  10.1175/EI-D-15-0028.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractRegional land surface and remote ocean variables have been considered as primary forcings altering the variability of summer rainfall over the Sahel. However, previous studies usually examined the two components separately. In this study, the authors apply statistical methods including correlation, multivariate linear regression, and Granger causality analyses to investigate the relative roles of spring–summer sea surface temperature (SST) and vegetation activity in explaining the Sahel summer rainfall variability from 1982 to 2006. The remotely sensed normalized difference vegetation index (NDVI) is used as an indicator of land surface forcing. This study shows that spring and summer SSTs over the subtropical North Atlantic have significant positive correlations with summer rainfall. The spring and summer NDVIs over the Sahel have significant negative and positive correlations, respectively, with summer rainfall. Based on the multivariate linear regression analysis, the adjusted R2 for the integr...

【 授权许可】

Unknown