Convective Scale Structure and Evolution of a Squall Line Observed by C-Band Dual Doppler Radar in an Arid Region of Northwestern China |
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Authors: | LIU Liping ZHUANG Wei ZHANG Pengfei and MU Rong |
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Institution: | The State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081,The State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081,CIMMS, University of Oklahoma, Norman, Oklahoma, USA,The State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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Abstract: | A long-lived and loosely organized squall line moved rapidly across ürümqi, the capital city of Xinjiang Uygur Autonomous
Region of China on 26 June 2005, generating hail and strong winds. The squall line was observed by a dual Doppler radar system
in a field experiment conducted in 2004 and 2005 by the Chinese Academy of Meteorological Sciences and the local meteorological
bureau in northwestern China. The 3D wind fields within the squall line were retrieved through dual Doppler analyses and a
variational Doppler radar analysis system (VDRAS). The formation and structure of the squall line as well as the genesis and
evolution of embedded convective cells were investigated. During its life period, the squall line consisted of six storm cells
extending about 100 km in length, and produced hail of about 25 mm in diameter and strong surface winds up to 11 m s−1. Radar observations revealed a broad region of stratiform rain in a meso-β cyclone, with the squall line located to the west of this. Two meso-γ scale vortices were found within the squall line. Compared to typical squall lines in moist regions, such as Guangdong Province
and Shanghai, which tend to be around 300–400 km in length, have echo tops of 17–19 km, and produce maximum surface winds
of about 25 m s−1 and temperature variations of about 8°C this squall line system had weaker maximum reflectivity (55 dBZ), a lower echo top (13 km) and smaller extension (about 100 km), relatively little stratiform rainfall preceding the convective
line, and a similar moving speed and temperature variation at the surface. |
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Keywords: | dual Doppler radar convective scale squall line |
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