气候学
准两年振荡
对流层
北半球
厄尔尼诺南方涛动
亚热带
环境科学
北大西洋涛动
平流层
气候模式
耦合模型比对项目
太平洋十年振荡
大气科学
南半球
遥相关
地质学
海洋学
气候变化
生物
渔业
作者
Felicitas Hansen,Katja Matthes,Sebastian Wahl
出处
期刊:Journal of Climate
[American Meteorological Society]
日期:2016-02-08
卷期号:29 (4): 1353-1368
被引量:32
标识
DOI:10.1175/jcli-d-15-0164.1
摘要
Abstract This study investigates the interaction of the quasi-biennial oscillation (QBO) and the El Niño–Southern Oscillation (ENSO) in the troposphere separately for the North Pacific and North Atlantic region. Three 145-yr model simulations with NCAR’s Community Earth System Model Whole Atmosphere Community Climate Model (CESM-WACCM) are analyzed where only natural (no anthropogenic) forcings are considered. These long simulations allow the authors to obtain statistically reliable results from an exceptional large number of cases for each combination of the QBO (westerly and easterly) and ENSO phases (El Niño and La Niña). Two different analysis methods were applied to investigate where nonlinearity might play a role in QBO–ENSO interactions. The analyses reveal that the stratospheric equatorial QBO anomalies extend down to the troposphere over the North Pacific during Northern Hemisphere winter only during La Niña and not during El Niño events. The Aleutian low is deepened during QBO westerly (QBOW) as compared to QBO easterly (QBOE) conditions, and the North Pacific subtropical jet is shifted northward during La Niña. In the North Atlantic, the interaction of QBOW with La Niña conditions (QBOE with El Niño) results in a positive (negative) North Atlantic Oscillation (NAO) pattern. For both regions, nonlinear interactions between the QBO and ENSO might play a role. The results provide the potential to enhance the skill of tropospheric seasonal predictions in the North Atlantic and North Pacific region.
科研通智能强力驱动
Strongly Powered by AbleSci AI