文献类型：期刊文献

英文题名：A Contrast of Recent Changing Tendencies in Genesis Productivity of Tropical Cloud Clusters over the Western North Pacific in May and October

作者：Peng, Xugang[1];Wang, Lei[1,2];Wu, Minmin[1];Gan, Qiuying[1]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Dept Educ Guangdong Prov, Key Lab Climate Resources & Environm Continental, Zhanjiang 524088, Peoples R China

年份：2021

卷号：12

期号：9

外文期刊名：ATMOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000699364300001)、、EI(收录号：20213810930600)、Scopus(收录号：2-s2.0-85115208600)、WOS

基金：This work was supported by the National Natural Science Foundation of China [grant number 41776031], the National Key Research and Development Program of China [grant number 2018YFC1506903], the team project funding of scientific research innovation for universities in Guangdong province [grant number 2019KCXTF021], the program for scientific research start-up funds of Guangdong Ocean University [grant number R17051] and the Guangdong Natural Science Foundation [grant number 2015A030313796].

语种：英文

外文关键词：tropical cloud cluster; tropical cyclone; genesis productivity; western North Pacific; late 1990s climate shift; seasonality of climatic change; sea surface temperature anomalies

外文摘要：Tropical cloud clusters (TCCs) are embryos of tropical cyclones (TCs) and may have the potential to develop into TCs. The genesis productivity (GP) of TCCs is used to quantify the proportion of TCCs that can evolve into TCs. Recent studies have revealed a decrease in GP of western North Pacific (WNP) TCCs during the extended boreal summer (July-October) since 1998. Here, we show that the changing tendencies in GP of WNP TCCs have obvious seasonality. Although most months could see recent decreases in GP of WNP TCCs, with October experiencing the strongest decreasing trend, May is the only month with a significant recent increasing trend. The opposite changing tendencies in May and October could be attributed to different changes in low-level atmospheric circulation anomalies triggered by different sea surface temperature (SST) configurations across the tropical oceans. In May, stronger SST warming in the tropical western Pacific could prompt increased anomalous westerlies associated with anomalous cyclonic circulation, accompanied by the weakening of the WNP subtropical high and the strengthening of the WNP monsoon. Such changes in background atmospheric circulations could favor the enhancement of atmospheric eddy kinetic energy and barotropic energy conversions, resulting in a recent intensified GP of WNP TCCs in May. In October, stronger SST warming in the tropical Atlantic and Indian Oceans contributed to anomalous easterlies over the tropical WNP associated with anomalous anticyclonic circulation, giving rise to the suppressed atmospheric eddy kinetic energy and recent weakened GP of WNP TCCs. These results highlight the seasonality in recent changing tendencies in the GP of WNP TCCs and associated large-scale atmospheric-oceanic conditions.