A Statistical Comparison of the Westerly Wind Bursts between the Positive and Negative Phases of the

• 作 者: Yunhao SHI Jingzhi SU
• 机 构: Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081“,”Un
• 出 处: 气象学报（英文版）
• 发表日期: 2020年2期
• 关键词: westerly wind bursts (WWBs) WWB strength WWB accumulated day Pacific decadal osc

To understand the diversity of the El Ni?o–South Oscillation (ENSO) under the background of Pacific decadal oscillation (PDO) during recent decades, characteristics of westerly wind bursts (WWBs) during positive and negat-ive phases of the PDO were analyzed. It is shown that, during the ENSO developing period, the El Ni?o evolution may be affected by stronger or more frequent WWBs in the positive PDO phase than in the negative PDO phase. The sustained effects of atmospheric dynamics on the equatorial ocean can be indicated by the accumulated WWB strength, which contains most WWB characteristics, including the accumulated days, occurrence frequency, strength, and spatial range of WWBs. The synoptic/climate systems that are directly related to WWBs show a wider spatial distribution in the positive PDO phase than in the negative PDO phase.