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DOI | 10.1175/JCLI-D-17-0147.1 |
Tropical-Extratropical Interactions Associated with East Asian Cold Air Outbreaks. Part II: Intraseasonal Variation | |
Abdillah, Muhammad Rais; Kanno, Yuki; Iwasaki, Toshiki | |
2018 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:2页码:473-490 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Intraseasonal variations of East Asian cold air outbreaks (CAOs) in relation to the tropical atmosphere during 34 winters (DJF) are investigated. This study is a continuation of Part I, which discussed the interannual variability of East Asian CAOs. Two types of quantitative East Asian CAOs, western and eastern CAOs, are examined. Their variations are identified by the zonal integration of equatorward flux of cold air mass (CAM) below 280K at 45 degrees N over 90 degrees-135 degrees E and 135 degrees E-180 degrees. A day-lagged regression analysis reveals that peaks of intraseasonal western and eastern CAO events are preconditioned by large-scale tropical convection anomalies resembling particular phases of the Madden-Julian oscillation (MJO). Western CAO events tend to occur when the convective phase of the MJO crosses over the Maritime Continent. In contrast, eastern CAO events are triggered by the MJO over the western Pacific. Observations of MJO-related atmospheric anomalies indicate the important roles of poleward Rossby wave trains in affecting extratropical East Asian CAOs. The barotropic Rossby waves develop negative geopotential height anomalies in midlatitude East Asia, which then induce a low-level equatorward cold airflow. Several experiments in an atmospheric model using prescribed MJO-like heating anomalies demonstrate that the Maritime Continent MJO and the western Pacific MJO clearly affect the equatorward CAM flux over the western and eastern CAO regions, respectively. Compared with the western CAO, the eastern CAO shows a more robust response to the MJO because of stronger wave activity during the western Pacific MJO. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425164800001 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; NORTHERN HEMISPHERIC WINTER ; ISENTROPIC ANALYSIS ; MARITIME CONTINENT ; BOREAL WINTER ; SURGES ; PRECIPITATION ; MONSOON ; MJO ; DISTURBANCES |
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/20323 |
专题 | 气候变化 |
作者单位 | Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Miyagi, Japan |
推荐引用方式 GB/T 7714 | Abdillah, Muhammad Rais,Kanno, Yuki,Iwasaki, Toshiki. Tropical-Extratropical Interactions Associated with East Asian Cold Air Outbreaks. Part II: Intraseasonal Variation[J]. JOURNAL OF CLIMATE,2018,31(2):473-490. |
APA | Abdillah, Muhammad Rais,Kanno, Yuki,&Iwasaki, Toshiki.(2018).Tropical-Extratropical Interactions Associated with East Asian Cold Air Outbreaks. Part II: Intraseasonal Variation.JOURNAL OF CLIMATE,31(2),473-490. |
MLA | Abdillah, Muhammad Rais,et al."Tropical-Extratropical Interactions Associated with East Asian Cold Air Outbreaks. Part II: Intraseasonal Variation".JOURNAL OF CLIMATE 31.2(2018):473-490. |
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