本文選題：西太平洋暖池 + 準(zhǔn)半年振蕩��； 參考：《南京信息工程大學(xué)》2016年碩士論文

【摘要】：本文采用1982-2014年逐月NOAA最優(yōu)插值海表面溫度資料OISST、海氣界面熱通量資料、OLR資料、再分析降水資料(CMAP)以及大氣環(huán)流要素場(chǎng)資料等,并利用旋轉(zhuǎn)經(jīng)驗(yàn)正交函數(shù)分解REOF、Morlet小波分析、功率譜分析、Butterworth帶通濾波等分析方法,對(duì)西太平洋暖池WPWP中的準(zhǔn)半年振蕩現(xiàn)象SAO及其年際變化特征進(jìn)行揭示和分析,并通過(guò)海氣相互作用及ENSO循環(huán)來(lái)探討WPWP中SAO年際變化的影響要素及其形成機(jī)制,最后通過(guò)P-SAO型與N-SAO型所對(duì)應(yīng)的東亞大氣環(huán)流與我國(guó)東部地區(qū)降水情況來(lái)分析SAO的年際變化對(duì)東亞氣候的影響。主要研究結(jié)果如下：(1)選取20°S-20°N,120°E-160°E作為WPWP的研究區(qū)域,通過(guò)REOF方法選取第一模態(tài)作為WPWP的主要空間模態(tài),通過(guò)對(duì)第一模態(tài)的時(shí)間序列PCI進(jìn)行功率譜分析和Morlet小波分析發(fā)現(xiàn),WPWP海域中顯著存在著5-7個(gè)月周期的振蕩現(xiàn)象。接著對(duì)PCI進(jìn)行5-7個(gè)月的帶通濾波處理,可以發(fā)現(xiàn)該時(shí)間序列在不同年份的位相演變存在著三種不同的情況：P-SAO型、N-SAO型和中性情況,說(shuō)明WPWP中的SAO現(xiàn)象存在著很強(qiáng)的年際變化,其中P-SAO型和N-SAO型以完全相反的位相發(fā)展,且均具有顯著的季節(jié)依賴性。(2) WPWP海溫場(chǎng)的SAO與海表面熱量平衡之間有著密切的聯(lián)系,通過(guò)凈熱通量NH或者通過(guò)OLR和風(fēng)速這兩個(gè)物理量的變化可以判斷海溫的異常變化。WPWP海溫場(chǎng)SAO的年際變化與ENSO循環(huán)緊密聯(lián)系,其中P-SAO型和N-SAO型分別對(duì)應(yīng)ENSO循環(huán)的冷、暖事件,WPWP海溫場(chǎng)SAO年際變化的形成原因可以解釋為由ENSO事件的緯向風(fēng)異常引起的,通過(guò)對(duì)流-云-太陽(yáng)輻射這樣一個(gè)負(fù)反饋過(guò)程而形成的。(3)夏季,P-SAO型對(duì)應(yīng)著我國(guó)東部地區(qū)降水分布為“南旱北澇”型,而P-SAO型則對(duì)應(yīng)著“南澇北旱”型；冬季,P-SAO型對(duì)應(yīng)著我國(guó)東部大部分地區(qū)降水偏多的情況,而N-SAO型則對(duì)應(yīng)降水偏少情況。WPWP中SAO的年際變化與東亞大氣異常環(huán)流以及我國(guó)東部地區(qū)降水異常都存在著緊密的聯(lián)系。
[Abstract]:In this paper, monthly NOAA interpolation data of sea surface temperature (OISST), air-sea interface heat flux data (OLR), precipitation data (CMAP) and atmospheric circulation factor field data are analyzed, and the REOFN Morlet wavelet analysis is performed by means of rotational empirical orthogonal function. Power spectrum analysis and Butterworth band-pass filtering are used to reveal and analyze the quasi-semi-annual oscillation in WPWP of the western Pacific Ocean and its interannual variation. The influence factors and the formation mechanism of the inter-annual variation of SAO in WPWP are discussed by air-sea interaction and ENSO cycle. Finally, the influence of inter-annual variation of SAO on the climate of East Asia is analyzed through the East Asian atmospheric circulation corresponding to P-SAO and N-SAO and the precipitation in eastern China. The main results are as follows: (1) the first mode of WPWP is chosen as the main spatial mode of WPWP by using the REOF method, and 20 擄S-20 擄NV 120 擄E-160 擄E is selected as the research area of WPWP. Based on the power spectrum analysis and Morlet wavelet analysis of the first mode of time series PCI, it is found that there is a 5-7 month period oscillation phenomenon in the WPWP sea area. Then the bandpass filter processing of PCI for 5-7 months shows that there are three different cases in the phase evolution of the time series in different years, namely: P-SAO type N-SAO type and neutral case, which indicates that the SAO phenomenon in WPWP has strong interannual variation. Among them, P-SAO and N-SAO develop in completely opposite phases, and both have significant seasonal dependence. (2) there is a close relationship between the SAO of WPWP SST field and the heat balance of the sea surface. Based on the variation of net heat flux NH or OLR and wind speed, we can judge the anomalous variation of SST. The inter-annual variation of SST field in WPWP is closely related to ENSO cycle, in which P-SAO and N-SAO correspond to the cold of ENSO cycle, respectively. The formation of the inter-annual variation of the WPWP SST field can be explained by the zonal wind anomaly of the ENSO event. It is formed by a negative feedback process of convection-cloud-solar radiation. (3) in summer, the P-SAO type corresponds to the "South drought and North waterlogging" pattern in the eastern part of China, while the P-SAO type corresponds to the "South waterlogging and North drought" type; In winter, the P-SAO type corresponds to more precipitation in most areas of eastern China, while N-SAO type corresponds to less precipitation. The inter-annual variation of SAO in WPWP is closely related to the anomalous atmospheric circulation in East Asia and the precipitation anomaly in the eastern part of China.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P732
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本文編號(hào)：2063845