西北太平洋7月海霧頻率年際變化及全球變暖背景下的可能趨勢
本文關(guān)鍵詞:西北太平洋7月海霧頻率年際變化及全球變暖背景下的可能趨勢 出處:《中國海洋大學(xué)》2014年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: 海霧頻率 西北太平洋 年際變化 環(huán)流形勢 CMIP5
【摘要】:本文利用ICOADS(International Comprehensive Ocean-Atmosphere Data Set)31年(1979-2009)的船測能見度資料和同時期CFSR(Climate Forecast SystemReanalysis)再分析云水含量數(shù)據(jù),,統(tǒng)計西北太平洋中緯度(40oN-50oN,140oE-170oW)7月海霧發(fā)生頻率,并研究其年際變化。多霧少霧年合成分析表明大氣環(huán)流形勢異常是影響西北太平洋7月份海霧頻率變化的主要因素。在多霧年(海霧頻率異常高),西北太平洋副熱帶高壓中心東移,其西側(cè)的南風(fēng)氣流導(dǎo)致副熱帶地區(qū)大量水汽向北輸送,同時,中緯度地區(qū)出現(xiàn)較強的高壓脊,有利于大氣層結(jié)的穩(wěn)定。充足的水汽和穩(wěn)定的大氣層結(jié)有助于西北太平洋中緯度地區(qū)海霧的形成。相反,在少霧年(海霧頻率異常低),副熱帶高壓西伸和南移,水汽幾乎無法到達中緯度地區(qū),同時,中緯度異常槽和異常偏北風(fēng)減弱背景南風(fēng)和大氣穩(wěn)定層結(jié),不利于海霧的發(fā)生。西北太平洋中緯度地區(qū)的低空物理要素(例如相對濕度,水汽通量,氣海溫差等)受到環(huán)流形勢的影響,在多霧年(少霧年)呈現(xiàn)出有利于(不利于)海霧發(fā)生的特征。通過個例分析,證明了海霧發(fā)生時,氣團來自于副熱帶地區(qū),并且當(dāng)氣塊經(jīng)過黑潮延伸體時,保持高溫高濕的性質(zhì),之后在中高緯冷海面上迅速降溫成霧,在非霧天氣個例中并無此特征。最后,根據(jù)環(huán)流形勢與海霧頻率變化關(guān)系,利用CMIP5(Coupled Model IntercomparisonProject Phase5) RCP (Representative Concentration Pathway)4.5和8.5試驗數(shù)據(jù),預(yù)估未來環(huán)流形勢,發(fā)現(xiàn)未來海霧頻率呈現(xiàn)減少的趨勢。
[Abstract]:This article uses ICOADS(International Comprehensive Ocean-Atmosphere Data Settings for 31 years. Ship survey visibility data and CFSR(Climate Forecast system analysis data from 1979 to 2009). The cloud water content data were analyzed again. The occurrence frequency of sea fog in July of 40oN-50oNC140oE-170oWN in the mid-latitude of the Northwest Pacific Ocean is calculated. It is shown that the anomalous atmospheric circulation situation is the main factor affecting the sea fog frequency in the Northwest Pacific Ocean in July, and in the multi-fog years (the sea fog frequency is abnormally high). The center of the northwest Pacific subtropical high moves eastward, and the southward wind current in the west leads to a large amount of water vapor being transported northward in the subtropical region. At the same time, a strong ridge of high pressure appears in the mid-latitude region. Sufficient water vapor and stable atmospheric stratification contribute to the formation of sea fog in the mid-latitudes of the Northwest Pacific Ocean. On the contrary, in less fog years (the frequency of sea fog is abnormally low). The subtropical high extends westward and moves southward, and the water vapor can hardly reach the mid-latitude area. At the same time, the anomalous trough and the anomalous northerly wind weaken the background south wind and the stable stratification of the atmosphere. The low-altitude physical elements (such as relative humidity, water vapor flux, air-sea temperature difference, etc.) in the mid-latitudes of the Northwest Pacific Ocean are affected by the circulation situation. In the years with more fog (less fog), the characteristics of sea fog are favorable (unfavorable). It is proved that the air mass comes from the subtropical region when the sea fog occurs, and when the gas block passes through the Kuroshio extension, it is proved that the air mass comes from the subtropical region when the sea fog occurs. The property of high temperature and high humidity is maintained, and then the fog is rapidly cooled on the cold sea surface in middle and high latitudes, but not in the case of non-foggy weather. Finally, according to the relationship between the circulation situation and the frequency variation of sea fog. Using CMIP5(Coupled Model IntercomparisonProject phase 5) RCP (. Representative Concentration Pathway)4.5 and 8.5 test data. Predicted the future circulation situation, discovered the future sea fog frequency to present the reduction tendency.
【學(xué)位授予單位】:中國海洋大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:P732
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