2002: A teleconnection pattern in upper-level meridional wind over the North African and Eurasian continent in summer

One-point correlation analysis on upper-level meridional wind identified the existence of a teleconnection pattern in July, which emerges from North Africa to East Asia along the westerly jet in the middle latitudes. We examined the spatial and temporal structures of this teleconnec-tion pattern, and found the unique characteristics rather different from the patterns in other elements such as geopotential height, streamfunction and vorticity. We also investigated the relationship between this teleconnection and precipitation, and suggested that the teleconnection is a possible linkage of the EASM to the Indian monsoon, and even to subtropical heating anomalies over Atlantic. 1. Introduction summer, and found a weak waveguide belt along the westerly jet stream around the whole Northern Hemisphere. In addition, some studies showedAlong the upper-level westerly jets, there are that there is a wave pattern of the correlationteleconnection patterns and stationary Rossby coefficients between the Indian summer monsoonwaves in boreal winter (Hoskins and Ambrizzi