本文關(guān)鍵詞：新標(biāo)準(zhǔn)下梅雨特征量的時間演變及異常梅年環(huán)流特征分析　出處：《華東師范大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 梅雨特征量 異常梅年 時間演變 新標(biāo)準(zhǔn)

【摘要】：本文利用降水資料、NCEP/NCAR提供的全球逐日再分析資料以及《梅雨監(jiān)測業(yè)務(wù)規(guī)定》中入、出梅日的確定,計算出我國梅雨監(jiān)測區(qū)以及四個子氣候區(qū)(江淮區(qū)、長江下游區(qū)、長江中游區(qū)和江南區(qū))1961-2010年梅雨期入、出梅日期等梅雨特征量,并對得到的出、入梅日進(jìn)行檢驗。此外,還分析了梅雨監(jiān)測區(qū)異常梅年環(huán)流特征。相關(guān)結(jié)果如下:(1)江南區(qū)平均入、出梅日最早,長江中游區(qū)和長江下游區(qū)次之,江淮區(qū)最晚。除了梅雨監(jiān)測區(qū)外,四個子氣候區(qū)均有空梅年。(2)長江中游區(qū)和長江下游區(qū)梅雨期長度和梅雨強度的變化趨勢較為一致。上世紀(jì)60年代末,梅雨期變長、梅雨強度增強,而后,處于較為穩(wěn)定的狀態(tài),直到90年代末-本世紀(jì)初,梅雨期變短、梅雨強度減弱。(3)梅雨監(jiān)測區(qū)以及四個子氣候區(qū)入梅日和出梅日的相關(guān)性較好,均通過了α=0.001顯著性檢驗。梅雨監(jiān)測區(qū)、江淮區(qū)和長江中游區(qū)出梅日和梅雨期長度、梅雨量以及梅雨強度的相關(guān)性比入梅日與它們的相關(guān)性高,而江南區(qū)的情況則相反。(4)對計算的各區(qū)平均入、出梅日期和文獻(xiàn)[1]西太副高脊線北跳的時間進(jìn)行驗證,發(fā)現(xiàn)平均入梅日與西太副高脊線的第一次北跳對應(yīng)較好,平均出梅日比西太副高脊線第二次北跳早2-3候。(5)在平均早入梅日前后:早入梅年,西太平洋副高較為強大,位置偏西北,副高脊線超過20° N;晚入梅年,西太平洋副高面積明顯減小,位置明顯偏東。在平均晚出梅日前后:早出梅年,西太平洋副高位置偏北,西太副高脊線超過30°N;晚出梅年,西太平洋副高依舊強大,西段副高脊線在30° N附近。
[Abstract]:In this paper, the precipitation data are used to determine the global daily reanalysis data provided by NCEP / NCAR and the "Meiyu Monitoring operational regulations". The characteristics of Meiyu in Meiyu monitoring area and four sub-climatic areas (Jianghuai area, lower reaches of Yangtze River, middle reaches of Yangtze River and Jiangnan region from 1961 to 2010) were calculated. In addition, the characteristics of abnormal Meiyue circulation in Meiyu monitoring area are analyzed. The correlation results are as follows: 1) the average entry of Jiangnan region is the earliest. The middle reaches of the Yangtze River and the lower reaches of the Yangtze River are the second, and the Jianghuai area is the last, except for the Meiyu monitoring area. In the middle reaches of the Yangtze River and the lower reaches of the Yangtze River, the variation trend of the Meiyu period and the Meiyu intensity is consistent. At the end of -40s, the Meiyu period becomes longer and the Meiyu intensity increases. Then, it was in a stable state, until the end of 90s to the beginning of this century, the Meiyu period became shorter, the Meiyu intensity weakened. The correlation between Meiyu monitoring area, Jianghuai area and the middle reaches of Yangtze River is higher than that of Meiyu day and Meiyu period, and the correlation of Meiyu rainfall and Meiyu intensity is higher than that of Meiyu day and Meiyu intensity. On the other hand, the situation in Jiangnan District is the opposite. [The results are as follows: 1) the time of northward jump of the ridge line of the West Pacific Subtropical High is verified, and it is found that the average date of entering the plum is better than the first time of the northward jump of the ridge line of the West Pacific Subtropical High. Before and after the average early entry date, the west Pacific subtropical high was stronger than the western Pacific subtropical high, and the ridge line of the subtropical high was more than 20 擄N. The area of the western Pacific subtropical high was obviously decreased and the position was obviously eastward in the late plum year. Before and after the average late plum day, the west Pacific subtropical high was located northward, and the ridge line of the west Pacific subtropical high was more than 30 擄N. The west Pacific subtropical high is still strong, and the ridge line of the western subtropical high is about 30 擄N.
【學(xué)位授予單位】：華東師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P426.6;P434

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