Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast
ABSTRACT: This study explores, for the first time, the asymmetric distribution of precipitation in tropical cyclones (TCs) making landfall along east China coast using reflectivity data collected from coastal Doppler radars at mainland China and Taiwan. Six TCs (Saomai, Khanun, Wipha, Matsa, Rananim...
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2013-05-01
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doaj-9a19e0777f8e4430abe2df4b03161e152021-02-02T04:52:26ZengKeAi Communications Co., Ltd.Tropical Cyclone Research and Review2225-60322013-05-01228195Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China CoastDan Wu0Kun Zhao1Ben Jong-Dao Jou2Wen-Chau Lee3Shanghai Typhoon Institute/China Meteorological Administration, Shanghai; Key Laboratory for Mesoscale Severe Weather/MOE and School of Atmospheric Science, Nanjing University, NanjingKey Laboratory for Mesoscale Severe Weather/MOE and School of Atmospheric Science, Nanjing University, Nanjing; Corresponding author address: Kun Zhao, Key Laboratory for Mesoscale Severe Weather/MOE and School of Atmospheric Science, Nanjing University, 22 Hankou Road, Gulou District, Nanjing 210093, China.Department of Atmospheric Sciences, National Taiwan University, TaipeiThe National Center for Atmospheric Research, BoulderABSTRACT: This study explores, for the first time, the asymmetric distribution of precipitation in tropical cyclones (TCs) making landfall along east China coast using reflectivity data collected from coastal Doppler radars at mainland China and Taiwan. Six TCs (Saomai, Khanun, Wipha, Matsa, Rananim and Krosa) from 2004 to 2007 are examined. The temporal and spatial evolution of these TCs’ inner and outer core asymmetric precipitation patterns before and after landfall is investigated. The radius of inner-core region is a function of the size of a TC apart from a fixed radius (100 km) adopted in previous studies.All six TCs possessed distinct asymmetric precipitation patterns between the inner- and outer- core regions. The amplitude of asymmetry decreases with the increasing TC intensity and it displays an ascending (descending) trend in the inner (outer) core. In the inner-core region, the heavy rainfall with reflectivity factor above 40 dBZ tends to locate at the downshear side before landfall. Four cases have precipitation maxima on the downshear left side, in agreement with previous studies. As TCs approaching land (~ 2 hr before landfall), their precipitation maxima generally shift to the front quadrant of the motion partly due to the interaction of TC with the land surface. In the outer-core region, the precipitation maxima occur in the front quadrant of the motion in five of the six cases before landfall. After landfall, the precipitation maxima shift from the right-front quadrant clockwisely to the right-rear quadrant of the motion collocated well with the mountainous areas along the coast, which indicates the impact of topography forcing on the precipitation distribution. This study illustrated how the precipitation asymmetry in the inner- and outer-core at different stages of TC landfall is affected by storm motion, vertical wind shear and topography. Keywords: landfalling tropical cyclone, asymmetric precipitation distribution, East Chinahttp://www.sciencedirect.com/science/article/pii/S2225603218300717 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dan Wu Kun Zhao Ben Jong-Dao Jou Wen-Chau Lee |
spellingShingle |
Dan Wu Kun Zhao Ben Jong-Dao Jou Wen-Chau Lee Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast Tropical Cyclone Research and Review |
author_facet |
Dan Wu Kun Zhao Ben Jong-Dao Jou Wen-Chau Lee |
author_sort |
Dan Wu |
title |
Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast |
title_short |
Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast |
title_full |
Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast |
title_fullStr |
Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast |
title_full_unstemmed |
Radar Observation of Precipitation Asymmetries in Tropical Cyclones Making Landfall on East China Coast |
title_sort |
radar observation of precipitation asymmetries in tropical cyclones making landfall on east china coast |
publisher |
KeAi Communications Co., Ltd. |
series |
Tropical Cyclone Research and Review |
issn |
2225-6032 |
publishDate |
2013-05-01 |
description |
ABSTRACT: This study explores, for the first time, the asymmetric distribution of precipitation in tropical cyclones (TCs) making landfall along east China coast using reflectivity data collected from coastal Doppler radars at mainland China and Taiwan. Six TCs (Saomai, Khanun, Wipha, Matsa, Rananim and Krosa) from 2004 to 2007 are examined. The temporal and spatial evolution of these TCs’ inner and outer core asymmetric precipitation patterns before and after landfall is investigated. The radius of inner-core region is a function of the size of a TC apart from a fixed radius (100 km) adopted in previous studies.All six TCs possessed distinct asymmetric precipitation patterns between the inner- and outer- core regions. The amplitude of asymmetry decreases with the increasing TC intensity and it displays an ascending (descending) trend in the inner (outer) core. In the inner-core region, the heavy rainfall with reflectivity factor above 40 dBZ tends to locate at the downshear side before landfall. Four cases have precipitation maxima on the downshear left side, in agreement with previous studies. As TCs approaching land (~ 2 hr before landfall), their precipitation maxima generally shift to the front quadrant of the motion partly due to the interaction of TC with the land surface. In the outer-core region, the precipitation maxima occur in the front quadrant of the motion in five of the six cases before landfall. After landfall, the precipitation maxima shift from the right-front quadrant clockwisely to the right-rear quadrant of the motion collocated well with the mountainous areas along the coast, which indicates the impact of topography forcing on the precipitation distribution. This study illustrated how the precipitation asymmetry in the inner- and outer-core at different stages of TC landfall is affected by storm motion, vertical wind shear and topography. Keywords: landfalling tropical cyclone, asymmetric precipitation distribution, East China |
url |
http://www.sciencedirect.com/science/article/pii/S2225603218300717 |
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