摘要
To understand the diversity of the El Ni?o–Southern Oscillation(ENSO)under the background of Pacific decadal oscillation(PDO)during recent decades,characteristics of westerly wind bursts(WWBs)during positive and negative 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.
基金
Supported by the National Key Research and Development Program of China(2016YFA0600602)
National Natural Science Foundation of China(41776039)。
