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contributor authorLiu, Hong-Bo
contributor authorYang, Jing
contributor authorZhang, Da-Lin
contributor authorWang, Bin
date accessioned2017-06-09T17:31:03Z
date available2017-06-09T17:31:03Z
date copyright2014/02/01
date issued2013
identifier issn0027-0644
identifier otherams-86586.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4230160
description abstracturing the mei-yu season of the summer of 2003, the Yangtze and Huai River basin (YHRB) encountered anomalously heavy rainfall, and the northern YHRB (nYHRB) suffered a severe flood because of five continuous extreme rainfall events. A spectral analysis of daily rainfall data over YHRB reveals two dominant frequency modes: one peak on day 14 and the other on day 4 (i.e., the quasi-biweekly and synoptic-scale mode, respectively). Results indicate that the two scales of disturbances contributed southwesterly and northeasterly anomalies, respectively, to the mei-yu frontal convergence over the southern YHRB (sYHRB) at the peak wet phase. An analysis of bandpass-filtered circulations shows that the lower and upper regions of the troposphere were fully coupled at the quasi-biweekly scale, and a lower-level cyclonic anomaly over sYHRB was phase locked with an anticyclonic anomaly over the Philippines. At the synoptic scale, the strong northeasterly components of an anticyclonic anomaly with a deep cold and dry layer helped generate the heavy rainfall over sYHRB. Results also indicate the passages of five synoptic-scale disturbances during the nYHRB rainfall. Like the sYHRB rainfall, these disturbances originated from the periodical generations of cyclonic and anticyclonic anomalies at the downstream of the Tibetan Plateau. The nYHRB rainfalls were generated as these disturbances moved northeastward under the influence of monsoonal flows and higher-latitude eastward-propagating Rossby wave trains. It is concluded that the sYHRB heavy rainfall resulted from the superposition of quasi-biweekly and synoptic-scale disturbances, whereas the intermittent passages of five synoptic-scale disturbances led to the flooding rainfall over nYHRB.
publisherAmerican Meteorological Society
titleRoles of Synoptic to Quasi-Biweekly Disturbances in Generating the Summer 2003 Heavy Rainfall in East China
typeJournal Paper
journal volume142
journal issue2
journal titleMonthly Weather Review
identifier doi10.1175/MWR-D-13-00055.1
journal fristpage886
journal lastpage904
treeMonthly Weather Review:;2013:;volume( 142 ):;issue: 002
contenttypeFulltext


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