2017年度西北太平洋台风活动异常特征及成因研究.pdfVIP

Open Journal of Nature Science 自然科学, 2018, 6(2), 139-146 Published Online March 2018 in Hans. /journal/ojns /10.12677/ojns.2018.62021 Analysis of Anomalous Typhoon Activities over the Western North Pacific in 2017 1 1 2 Liyi Wang , Qiuping Xia , Xin Chen 1 The 92919 Military Meteorological Observatory, Ningbo Zhejiang 2 The 91576 Military Meteorological Observatory, Ningbo Zhejiang th nd th Received: Mar. 8 , 2018; accepted: Mar. 22 , 2018; published: Mar. 29 , 2018 Abstract This article summarized the characteristics of anomalous typhoon activities and conducted the possible reasons, using typhoon activities data along with the atmospheric and oceanic data over the Western North Pacific (WNP) in 2017. The characteristics of anomalous typhoon activities over the WNP in 2017 mainly manifested on slightly more total amount, overall weakness and rare super ty- phoon; typhoons generated over the South China Sea (SCS) were more and less over the WNP Warm Pool (WP); typhoon activities busted out centrally. The reasons of anomalous typhoon activities over the WNP mainly included: the Western Pacific subtropical high was abnormally powerful, its posi- tion was farther southern and western, made difficult to typhoon activities, especially to super ty- phoon activities over the WNP; the abnormal sinking airflow made against typhoon activities over the WNP, WP, and the abnormal lift airflow in favor of typhoon activities over the SCS; the unaccom- plished development of La Niña event from 2016 to 2017 over tropical oceans had less effect on ty- phoon activities over the WNP; the twice centrally outbreaks of typhoon activities over the WN