ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 40 Issue 12 > 2014,40(12):1507-1512. DOI:10.7519/j.issn.1000-0526.2014.12.009 Prev Next
Analysis of Atmosphere Stratification in Extremely Heavy Rainfall Event Associated with Severe Typhoon Utor
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Abstract:
Severe Typhoon Utor (No.1311) brings sustained heavy rainfall with extremely strong convective storms to Guangdong after it makes landfall. Based on the observation and the NCAR FNL data, characteristics of large scale circulation, especially of the atmospheric stratification during the extreme event are studied. It is found that, the maintenance of the instable stratification is mainly due to the warm advection to Guangdong transferred by the low level jet. Further study reveals a truth that, the low level jet, originally cold over the sea, is warmed and blows to Guangdong when it moves across a warm air mass, which is forced from the land to the upstream region of Guangdong by the outer circulation of “Utor” while it is approaching Guangdong. The result of temperature diagnosis function confirms it. Similar phenomena are found in many cases which result in sustained torrential rain events after typhoons land. Therefore, the variation of the temperature field and the low level jet caused by the landfall of typhoon should be paid more attention to in forecasting operations.
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