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Contrast analysis on the gale of island and littoral weather stations over Bohai Straits

WANG Ri-dong1,2,JIANG Jun-ling2,GUO Wei-hua3,LIN Xiu-dong4(1.College of Atmospheric Science,Lanzhou University,Lanzhou 730000 China;2.Yantai Meteorological Bureau,Shandong Province 264003 China;3.Jining Meteorological Bureau,Shandong Province 272037 China;4.Shidao Observatory,Shandong Province 264309 China)  
Based on the one year gale data of 5 island stations and 3 littoral stations,employing climate statistics methods,to contrast analyse and investigate the distributions of the gale days in each sation,the characters of main gale direction and gale speed,the features of annual and monthly gale variation,and so on,the results shows some conclusions in Bohai straits:The grade from 6 to 7 is the mainly rate of gale speed,the probability of gale and gale speed in the south are bigger than those in the north;the maxium probability of gale is 57.5%;The maxium gale speed is 43.2m/s and create a new record of history;The biggest discrecpant value of the maxium gale speed in island station and littoral station is 20.8m/s;The monthly variation tendency configuration of gale speed has 2 apexes and 2 valley;The main gale direction is NW–NNE,North and South gale speed are bigger and the others are smaller;It has the typical feature of monsoon,which the gale direction is northern in winter and southern in summer,north gale and south gale appear alternately in spring and autumn;Using the data of island stations and littoral stations synthetically can reflect the climate feature accurately.
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