GSTDTAP  > 气候变化
DOI10.1175/JCLI-D-16-0759.1
The Weakened Intensity of the Atmospheric Quasi-Biweekly Oscillation over the Western North Pacific during Late Summer around the Late 1990s
Xu, Zhiqing1,2; Li, Tim3,4,5; Fan, Ke1,6,7
2017-12-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2017
卷号30期号:24
文章类型Article
语种英语
国家Peoples R China; USA
英文摘要

The interdecadal Pacific oscillation (IPO) shifted to a negative phase around the late 1990s. Its impact on the atmospheric quasi-biweekly oscillation (QBWO) intensity over the western North Pacific (WNP) during late summer was investigated. Corresponding to the phase transition of the IPO, La Nina-like SST anomalies and an enhanced Walker circulation appeared in the tropical Pacific, which led to decreased precipitation over the equatorial central and eastern Pacific. The decreased precipitation induced a Gill response with an anomalous anticyclone (cyclone) in the lower (upper) troposphere over the WNP. This resulted in anomalous background westerly vertical shear over the tropical WNP. Furthermore, the anomalous anticyclone induced anomalous horizontal divergence and descent motion in the planetary boundary layer, which led to decreased background surface moisture over the tropical WNP. These changes in background atmospheric conditions suppressed the development of QBWO perturbations over the tropical WNP. Therefore, the QBWO intensity weakened over the WNP after the late 1990s. The composite evolution of QBWO events before and after the late 1990s confirm the interdecadal change of the QBWO intensity. A simple model was employed to understand the relative role of the background moisture and vertical shear changes in modulating the QBWO activity. The result shows that the moisture change plays a more important role than the vertical shear change in weakening the QBWO intensity.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000423492500002
WOS关键词INTRASEASONAL OSCILLATIONS ; INTERANNUAL VARIATIONS ; GLOBAL PRECIPITATION ; WALKER CIRCULATION ; TROPICAL PACIFIC ; EQUATORIAL WAVES ; MONSOON ; CHINA ; VARIABILITY ; CLIMATOLOGY
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/20926
专题气候变化
作者单位1.Chinese Acad Sci, Inst Atmospher Phys, Nansen Zhu Int Res Ctr, Beijing, Peoples R China;
2.Chinese Acad Sci, Climate Change Res Ctr, Beijing, Peoples R China;
3.Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA;
4.Univ Hawaii Manoa, Dept Atmospher Sci, Honolulu, HI 96822 USA;
5.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Joint Int Res Lab Climate & Environm Change, Key Lab Meteorol Disaster,Minist Educ, Nanjing, Jiangsu, Peoples R China;
6.Univ Chinese Acad Sci, Beijing, Peoples R China;
7.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Jiangsu, Peoples R China
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GB/T 7714
Xu, Zhiqing,Li, Tim,Fan, Ke. The Weakened Intensity of the Atmospheric Quasi-Biweekly Oscillation over the Western North Pacific during Late Summer around the Late 1990s[J]. JOURNAL OF CLIMATE,2017,30(24).
APA Xu, Zhiqing,Li, Tim,&Fan, Ke.(2017).The Weakened Intensity of the Atmospheric Quasi-Biweekly Oscillation over the Western North Pacific during Late Summer around the Late 1990s.JOURNAL OF CLIMATE,30(24).
MLA Xu, Zhiqing,et al."The Weakened Intensity of the Atmospheric Quasi-Biweekly Oscillation over the Western North Pacific during Late Summer around the Late 1990s".JOURNAL OF CLIMATE 30.24(2017).
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