-
Abstract:
Based on the ERA reanalysis winds data, the multi-time scale variations of Somali jet are analyzed synthetically. The jet’s influences on rainfall in China on interannual, interdecadal and sub-monthly scales are also studied using correlation and composite analyses. The results demonstrate that the interdecadal variations of the jet are significant. The Somali jet became weaker in the 1960s and became the weakest in the early 1970s before enhancing slowly in the late 1970s. Moreover, the relation between the Somali jet and summer precipitation in China is close, but varies on different timescales. Preliminary analysis shows that the intensity variations in May and June during the early days of establishment are well correlated with summer precipitation in China. The Somali jet intensity on the interdecadal scale is closely related with interdecadal variations of the precipitation in China. Regardless of leading or contemporaneous correlation, the correlations between the Somali jet intensity and the rainfall in northern and southern China show obvious interdecadal variations. Moreover, the link between the anomalies of the jet intensity in May-August and precipitation evolution on synoptic scale in China is further studied. China has more rainfall with positive anomalies of the Somali jet but less rainfall with negative anomalies during the active period of the jet. The influence of positive Somali jet anomalies on China precipitation is more evident.
-
References
|
[1]
|
XUE Feng, ZENG Qing-cun. Diagnostic study on seasonality and interannual variability of wind field [J]. Adv Atmos Sci, 1999, 16(4): 537-543. |
|
[2]
|
XU Xiang-de, TAO Shi-yan, Wang Ji-zhi, et al. The relationship between water vapor transport features of Tibetan Plateau Monsoon “large triangle” affecting region and drought flood abnormality of China [J]. J Meteorol Res, 2002, 60(3): 537-543 (in Chinese). |
|
[3]
|
HUANG Rong-hui, ZHANG Zhen-zhou, HUANG Gang, et al. Characteristics of the water vapor transport in East Asian monsoon region and its difference from that in South Asian monsoon region in summer [J]. Chin J Atmos Sci, 1998, 22(4): 460-469 (in Chinese). |
|
[4]
|
HE Jin-hai, WANG Li-juan, WEN Min. Impact of the convection over the Indo-China Peninsula on the onset of SCSS summer monsoon [C]// Annual Meeting Section “Tropical Cyclones and Typhoons”, Beijing: Chinese Meteorological Society, 2003: 13-17 (in Chinese). |
|
[5]
|
LI Chong-yin, WU Jing-bo. Important role of the Somalian cross-equator flow in the onset of the South China Sea summer monsoon [J]. Chin J Atmos Sci, 2002, 26(2): 185-192 (in Chinese). |
|
[6]
|
SIMPSON G. The southwest monsoon [J]. Quart J Roy Meteorol Soc, 1921, 47(1): 151-172. |
|
[7]
|
TAO Shi-yan, XU Shu-ying, GUO Qi-yun. The characteristics of the zonal and meridional circulation over tropical and subtropical regions in Western Asia in summer [J]. J Meteorol Res, 1962, 32(2): 91-103 (in Chinese). |
|
[8]
|
FINDLATER J. A major low-level air current near the Indian Ocean during the northern summer [J]. Quart J Roy Meteor Soc, 1969, 95(404): 362-380. |
|
[9]
|
BANNON P R. On the dynamics of the East African jet. II: Jet transients [J]. J Atmos Sci, 1979, 36(11): 2 153-2 168. |
-
-
-
粤公网安备 4401069904700002号
DownLoad: