The Analysis Of The Yellow Sea Fog In Winter In February2010

In this paper, we use many datasets to analyze the mechanism of Yellow Sea fog inFebruary2010. The resources contain MODIS (Moderate-resolution ImagingSpectroradiometer) satellite1B data, infrared data and visible satellite imagery ofMTSAT-1R(The Multi-functional Transport Satellite), New Generation sst data,FNL(Final Analysis) re-analysis data and CFSR(The Climate Forecast SystemReanalysis) data of NCEP(National Centers Environmental Prediction), and stationsounding data along the coasts of the Bohai, Yellow and East seas. This paper beginswith visible satellite imageries of MTSAT-1R satellite, and nighttime sea fog ofretrieving, to know of the winter sea fog at first. And according to sea ice melting andsea current flowing southward，cold sst plays play an important role in sea fogoccurrence. We would analyze the mechanism of this sea fog from a differentperspective, such as sst and meteorology conditions. We can get the followingconclusions:(1)The fog at first started in the north of Yellow Sea. However, it formed becausecold and warm air masses mixed together and made relative humidity increase, to formthe mixing fog. But after12(UTC)22, warm advection moved northward and coldadvection disappeared. At this time, it slowly turned into advection cooling fog. Sea fogappeared in Qingdao comes from the Yellow Sea, and is advection cooling fog.(2) In the Yellow Sea, cold and warm air masses mixed together and made therelative humidity increase, to form the mixing fog. The height of mixed fog wassignificantly lower compared with the advection cooling fog.(3) Sea surface temperature anomaly was lower. In February2010, the Bohai Seawas frozen widely and the lower sst anomaly may be associated with melting ice. (4) In winter, the ocean is a heat source. Sea surface temperature is generally higherthan the temperature. But in the case of the synoptic scale circulation, the formation ofadvection cooling fog is also possible.(5)The mixing fog has the relation with the intensity of the cold advection. The coldadvection, which is weaker and lower than990hPa, is in favor of the formation of themixing fog. And the cold advection, which is stronger and lower than950hPa, makes thesea fog disappear.(6)We use WRF model to do control test and sensitivity test. The model resultsshowed that, it can simulate this sea fog better, using the main physical scheme wechosen. The mixing fog is closely related to cold waters. The advection cooling fog isconsistent with the location of cold waters. In the sensitivity test, the mixing fog andadvection cooling fog are strongly influenced by sea surface temperature. The mixingfog changed dramatically, because cold air denaturalize during the moving and is notconducive to generate mixing fog. It is atmospheric stability that becomes weaker in lowlevel because of the increasing sea surface temperature, and make the advection coolingfog area decrease. The cold sea plays a key role in the advection cooling fog.