Tropical Cyclone Activity Over the Western North Pacific in 2013

• DOI: 10.6057/2014tcrr03.01
• Publication Date: 2014-09-01
• Authors: Ming Ying; Lina Bai; Ruifen Zhan
• Keywords: Subtropical ridge; Tropical cyclogenesis; Cyclogenesis; Middle latitudes; Madden–Julian oscillation; Circulation (fluid dynamics); Storm track; Atmospheric Circulation; African easterly jet

ABSTRACT This paper presents a review of tropical cyclone (TC) activity over the western North Pacific in 2013 and examines main factors that influenced pattern activity. The season was characterized by an above-normal genesis number named storms, near-normal total occurrence frequency, accumulated energy. Both SSTs sector East Asian summer monsoon contributed to favorable conditions for active cyclogenesis. circulation also controlled TC track patterns. Three prevailing tracks were identified, along with four stages transition different combinations tracks. patterns associated variations regional circulation, which turn closely related seasonal variation monsoon. intra-seasonal oscillation. In particular, quasi-biweekly oscillation (QBWO) important during early late seasons, while 30-60 day significant from July October. QBWO mainly subtropics midlatitudes, Pacific-Japan pattern, subtropical high, cyclonic early, main, respectively.