Two Types of strong Northeast Asian Summer Monsoon
김정은; 홍성유; 예상욱
A question regarding how a basin-wide warming in the Indian Ocean is associated with the subsystem of Asian summer monsoon is unanswered. We examine the characteristics of strong northeast Asian summer monsoon (NEASM) with (i.e., A-type) and without (i.e., B-type) a basin-wide warming in the Indian Ocean during the preceding winter. In case of the A-type strong El Nino-like sea surface temperature (SST) decay very rapidly from the preceding winter to the following summer, which may be due to a feedback process of warm Indian Ocean. In contrast, an El Nino-like SST during the preceding winter persistently influences into the following summer as in the B-type. Furthermore, the striking difference can be found in the atmospheric teleconnection pattern from the tropics to the midlatitude over the Indo-Pacific region, i.e., the Pacific-Japan-like pattern versus a pronounced Rossby wave train pattern. Such processes may result in somewhat different spatial structure and rainfall intensity in the two types of strong NEASM.