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The cooling and moistening effect on the formation of sea fog in the Huanghai Sea

Acta Oceanologica Sinica 2006年第2期25卷 49-62页

作者： HUANG Jian ZHOU Faxiu Department of Marine Meteorology Ocean University of China Qingdao 266003 China Institute of Tropical and Marine Meteorology of Guangzhou China Meteorological Administration Guangzhou 510080 China

With the sea surface observations from ICOADS for the years 1960-2002, the conditions of coohng, evaporauon anu water vapol transportation are analyzed and compared for the formation of seasonal sea fog in April-July in the Huanghai Sea. It is found that sea surface cooling is always existent during the fog seasons while sea surface evaporation only appears in April-June in the Huanghai Sea. Local evaporation alone is not sufficient to form fogs though it may lead to light ones. water vapor transported from the low-latitudes accomplished by specific synoptic systems is the most important condition for sea fog formation. In general, the moistening effect is more important than the cooling one.

关键词： sea fog in Huanghai Sea cooling effect moistening effect water vapor transportation

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Variation in Summer Rainfall in North China during the Period 1956-2007 and Links with Atmospheric Circulation

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Advances in Atmospheric Sciences 2011年第2期28卷 363-374页

作者：梁丰陶诗言卫捷布和朝鲁 Beijing Meteorological Bureau China Meteorological Administration Institute of Atmospheric Physics Chinese Academy of Sciences

Using gauge precipitation data and NCEP-NCAR reanalysis data, the interdecadal changes in summer precipitation during the period 1956-2007 in North China and the link with atmospheric circulation change over Eurasia are studied. Results show that precipitation amounts decreased by 16.2 mm per decade, which was attributable to a significant reduction in precipitation frequency. Contrary wave trains were found in the subtropical westerly jet （wave guide） over Eurasia for the wet and dry years of North China. When the wave trains had a ridge （trough） around the Korean Peninsula, conditions favored （disfavored） the westward and northward extension of the West Pacific subtropical high. The westward and northward extension of the West Pacific subtropical high is, and was, beneficial to rainfall in North China. The downstream propagation of Rossby waves was found to favor the maintenance of these wave trains. Sensible heating in the south of Lake Baikal and latent heating from the Korean Peninsula to the south of Japan increased during the period 1980-2007, as compared to that during 1957-1979. the wet period. These changes had positive influences on the maintenance of Anticyclonic-Cyclonic anomaly centers in the wave trains. Furthermore, northerly winds were prevalent in the lower troposphere during the dry period （1980-2007）. which prohibited the transportation of water vapor to North China from the seas and thereby led to a decrease in rainfall in North China. The weakening of the Indian Monsoon during the dry period might be one of reasons for the reduction in water vapor transportation.

关键词： North China precipitation frequency wave trains downstream development water vapor transportation latent heat sensible heat

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