發(fā)布時(shí)間：2019-06-10 18:15

【摘要】：本文首先利用氣候態(tài)海洋資料(WOA13和Argo)溫鹽數(shù)據(jù),通過(guò)地轉(zhuǎn)流分析方法(P-vector),計(jì)算出北太平洋絕對(duì)地轉(zhuǎn)流場(chǎng),并對(duì)北太平洋基本環(huán)流結(jié)構(gòu)進(jìn)行描述分析。進(jìn)一步,我們針對(duì)當(dāng)前流行的耦合氣候模式輸出結(jié)果進(jìn)行分析,探討耦合氣候模式中的北太平洋環(huán)流結(jié)構(gòu)以及相應(yīng)的海洋環(huán)流經(jīng)向輸運(yùn)的模擬效果。海表面溫度(SST)能夠在一定程度上反應(yīng)海洋環(huán)流的動(dòng)力機(jī)制,我們?yōu)檫x擇一套較精確的SST參考資料,利用大洋24航次的船載SST分別對(duì)微波遙感衛(wèi)星TMISST和多源融合數(shù)據(jù)OSTIASST進(jìn)行驗(yàn)證評(píng)估。結(jié)果發(fā)現(xiàn)OSTIASST與觀測(cè)相比,誤差遠(yuǎn)小于TMISST,所以本文最終選擇OSTIASST作為模式中SST誤差衡量標(biāo)準(zhǔn)。隨后,我們定性比較了耦合氣候模式和OSTIA數(shù)據(jù)集中的氣候態(tài)SST分布。通過(guò)將WOA13和Argo資料(2004-2015)反演的絕對(duì)地轉(zhuǎn)流與前人觀測(cè)調(diào)查研究進(jìn)行對(duì)比,得出在2000m以上的海洋中,Argo資料更能夠反應(yīng)北太平洋真實(shí)的平均環(huán)流結(jié)構(gòu)。選用Argo資料反演的地轉(zhuǎn)流作為參照,用來(lái)驗(yàn)證Sverdrup輸運(yùn),結(jié)果表明Sverdrup輸運(yùn)只在北太平洋中東部適用。同樣,本文分析了 CMIP5中8個(gè)氣候中的地轉(zhuǎn)流和Sverdrup經(jīng)向輸運(yùn),結(jié)果發(fā)現(xiàn)氣候模式中的Sverdrup理論適用性同樣較差。值得強(qiáng)調(diào)的是,氣候模式中真實(shí)經(jīng)向輸運(yùn)與Sverdrup對(duì)比發(fā)現(xiàn)大部分模式存在較大偏差,然而小部分低分辨率的模式反而誤差較小。這說(shuō)明大部分高分辨率模式中的真實(shí)流動(dòng)不但受Sverdrup平衡理論等線性動(dòng)力過(guò)程的影響,還受局地渦等非線性動(dòng)力過(guò)程的影響,而低分辨率模式則無(wú)法模擬出非線性動(dòng)力過(guò)程,使得模擬出的流場(chǎng)與Sverdrup理論更為接近。
[Abstract]:In this paper, based on the climatic ocean data (WOA13 and Argo) temperature and salt data, the absolute geostrophic flow field in the North Pacific is calculated by geostrophic flow analysis method (P-vector), and the basic circulation structure in the North Pacific is described and analyzed. Furthermore, we analyze the output results of the current popular coupled climate model, and discuss the circulation structure of the North Pacific Ocean in the coupled climate model and the simulation effect of the meridional transport of the corresponding ocean circulation. Sea surface temperature (SST) can reflect the dynamic mechanism of ocean circulation to a certain extent. In order to select a more accurate set of SST reference materials, Microwave remote sensing satellite TMISST and multi-source fusion data OSTIASST were verified and evaluated by ocean 24 shipborne SST. The results show that the error of OSTIASST is much smaller than that of TMISST, so OSTIASST is finally selected as the criterion of SST error in the model. Then, we qualitatively compare the climatic SST distribution between the coupled climate model and the OSTIA data set. By comparing the absolute geostrophic current inversed from WOA13 and Argo data (2004 / 2015) with previous observational investigations, it is concluded that Argo data can better reflect the real average circulation structure in the North Pacific Ocean in more than 2000m oceans. The geostrophic current inversed from Argo data is used as a reference to verify Sverdrup transport. The results show that Sverdrup transport is only suitable in the east-central North Pacific. Similarly, the geostrophic flow and Sverdrup meridional transport in eight climates in CMIP5 are analyzed in this paper. the results show that the applicability of Sverdrup theory in climate model is also poor. It is worth emphasizing that the real meridional transport in the climate model is compared with Sverdrup, and it is found that most of the models have large deviation, but the error of a small number of low-resolution models is small. This shows that the real flow in most high-resolution models is affected not only by linear dynamic processes such as Sverdrup equilibrium theory, but also by nonlinear dynamic processes such as local vortexes, while the low-resolution model can not simulate nonlinear dynamic processes. The simulated flow field is closer to Sverdrup theory.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P731.27

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本文編號(hào)：2496636