湛江東海島二月海陸風(fēng)環(huán)流特征研究

doi:10.3969/2012jms.0072

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湛江東海島二月海陸風(fēng)環(huán)流特征研究
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                        10.3969/2012jms.0072
                    
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基金項(xiàng)目:熱帶海洋氣象科學(xué)研究基金(RDJJ201004);廣東海洋大學(xué)引進(jìn)人才科研項(xiàng)目(1112190);中國(guó)氣象局氣候變化專項(xiàng)(CCSF2011-25);災(zāi)害天氣國(guó)家重點(diǎn)實(shí)驗(yàn)室2011年度開放課題資助項(xiàng)目

Analyses on characteristics of sea-land breeze over Donghai island of Zhanjiang in February of 2011

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利用2011年2月湛江東海島風(fēng)廓線雷達(dá)資料,系統(tǒng)分析了湛江東海島2月平均風(fēng)場(chǎng)特征及海陸風(fēng)特征,結(jié)果表明:2月湛江東海島150 m高度處以東偏北出現(xiàn)頻率最大,在E、ENE和NE三個(gè)方位的風(fēng)向出現(xiàn)頻率之和為66.6%,偏西七個(gè)方位的風(fēng)向出現(xiàn)頻率之和僅為1%。以SSW方位為界,偏東風(fēng)與偏西風(fēng)的出現(xiàn)頻率差異明顯。各整點(diǎn)的月平均風(fēng)速1:00—15:00變化較小,均在1 m/s左右波動(dòng);15:00—20:00風(fēng)速及風(fēng)速波動(dòng)都較大,最大值出現(xiàn)在16:00時(shí),為2.1 m/s。2011年2月中只有2日與14日兩日符合海陸風(fēng)日條件,兩日共同海風(fēng)時(shí)段為13:00—20:00,持續(xù)7 h;陸風(fēng)時(shí)段為2:00—7:00,持續(xù)5 h。海風(fēng)平均風(fēng)速為2.1 m/s,陸風(fēng)平均風(fēng)速為0.8 m/s,海風(fēng)平均風(fēng)速明顯大于陸風(fēng)風(fēng)速。海風(fēng)與陸風(fēng)環(huán)流垂直高度相差甚小,約1.2 km,風(fēng)速隨高度變化趨勢(shì)均為先增后減;海風(fēng)最大風(fēng)速出現(xiàn)在750 m高度處,陸風(fēng)出現(xiàn)在500 m高度處,500~750 m高度區(qū)間海風(fēng)環(huán)流強(qiáng)度明顯強(qiáng)于陸風(fēng)環(huán)流。2 km之上為均勻一致的系統(tǒng)性西風(fēng)環(huán)流。

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The average wind characteristics and sea-land breeze characteristics are analyzed by using the data of wind profiler during February 2011 on Donghai island of Zhanjiang. The results show that: the prevailing wind direction is northeasterly on Donghai island during February 2011 at an altitude of 150 m and the total frequency of occurrences of three directions E, ENE, NE is 66.6%, in contrast, the total frequency of occurrences of westerly is only 1%. There is an obvious difference of occurrence frequency between westerly winds and easterly winds. The hourly changes of average monthly wind speed is restricted to small range about 1 m/s from 1:00 to 15:00; and fluctuation becomes larger during 15:00 to 20:00, the maximal speed of 2.1 m/s appears at 16:00. In February, only two days meet the conditions of sea-land breeze. In sea-land breeze day, the common duration of sea breeze is from 13:00 to 20:00, lasting 7 h, and land breeze's common duration is from 2:00 to 7:00, lasting 5 h. The mean speed of land breeze is 0.8 m/s, which are smaller than 2.1 m/s of sea breeze. The vertical height of land breeze is about 1 200 m during the sea-land breeze day, which differs slightly from sea breeze. The wind speeds of both sea breeze and land breeze have the similar trends of increasing first and then decreasing with increasing altitude. The maximal wind speed of sea breeze appears at 750 m, and that of land breeze appears at 500 m. The sea breeze circulation is much stronger than land breeze in the region of 500 to 750 m height. The wind direction basically remains unchanged above 2 km and that is the large-scale uniform systematic west wind circulation.

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徐峰,王晶,張羽,張書文,黃克鑫.湛江東海島二月海陸風(fēng)環(huán)流特征研究.氣象科學(xué),2012,32(4):423-429 XU Feng, WANG Jing, ZHANG Yu, ZHANG Shuwen, HUANG Kexin. Analyses on characteristics of sea-land breeze over Donghai island of Zhanjiang in February of 2011. Journal of the Meteorological Sciences,2012,32(4):423-429

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收稿日期:2011-08-28
最后修改日期:2012-04-27
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在線發(fā)布日期: 2012-08-16
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