Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0189.1 |
Extratropical Response to the MJO: Nonlinearity and Sensitivity to the Initial State | |
Lin, Hai; Brunet, Gilbert | |
2018 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:1页码:219-234 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Previous studies have shown that the Madden-Julian oscillation (MJO) has a global impact that may provide an important source of skill for subseasonal predictions. The extratropical response was found to be the strongest when the tropical diabatic heating has a dipole structure with convection anomaly centers of opposite sign in the eastern Indian Ocean and the western Pacific. A positive (negative) MJO dipole heating refers to that with heating (cooling) in the eastern Indian Ocean and cooling (heating) in the western Pacific. In this study, two aspects of the extratropical response to the MJO are examined: 1) nonlinearity, which answers the question of whether the response to a positive MJO dipole heating is the mirror image of that to a negative MJO, and 2) sensitivity to the initial state, which explores the dependence of the extratropical response on the initial condition of the westerly jet. Ensemble integrations using a primitive-equation global atmospheric circulation model are performed with anomalous tropical thermal forcings that resemble a positive MJO (+MJO) and a negative MJO (-MJO). The response in the first week is largely linear. After that, significant asymmetry is found between the response in the positive MJO and the negative MJO. The 500-hPa negative geopotential height response in the North Pacific of the -MJO run is located about 308 east of the positive height response of the +MJO run. There is also an eastward shift of the extratropical wave train in the Pacific-North American region. This simulated nonlinearity is in agreement with the observations. The two leading response patterns among the ensemble members are identified by an empirical orthogonal function (EOF) analysis. EOF1 represents an eastward shift of the wave train, which is positively correlated with strengthening of the East Asian subtropical upper-troposphere westerly jet in the initial condition. On the other hand, EOF2 represents an amplification of the response, which is associated with a southward shift of the westerly jet in the initial state. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425750200013 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; GLOBAL ATMOSPHERIC CIRCULATION ; SURFACE AIR-TEMPERATURE ; ROSSBY-WAVE PROPAGATION ; WESTERN UNITED-STATES ; EL-NINO ; TROPICAL CONVECTION ; NORTHERN WINTER ; BOREAL WINTER ; PRECIPITATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29683 |
专题 | 地球科学 |
作者单位 | Environm & Climate Change Canada, Meteorol Res Div, Dorval, PQ, Canada |
推荐引用方式 GB/T 7714 | Lin, Hai,Brunet, Gilbert. Extratropical Response to the MJO: Nonlinearity and Sensitivity to the Initial State[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(1):219-234. |
APA | Lin, Hai,&Brunet, Gilbert.(2018).Extratropical Response to the MJO: Nonlinearity and Sensitivity to the Initial State.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(1),219-234. |
MLA | Lin, Hai,et al."Extratropical Response to the MJO: Nonlinearity and Sensitivity to the Initial State".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.1(2018):219-234. |
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