本文選題：副熱帶模態(tài)水 + 潛沉率　； 參考：《中國科學(xué)院研究生院(海洋研究所)》2016年博士論文

【摘要】：北太平洋副熱帶模態(tài)水是冬末海氣相互作用產(chǎn)生的垂向性質(zhì)均一的低位渦水,可以將氣候變化的異常信號通過潛沉的作用進(jìn)入永久性密度躍層,并且向低緯度海域輸運(yùn),對低緯度海域的氣候異常有重要影響。因此,認(rèn)識(shí)和了解北太平洋副熱帶模態(tài)水潛沉的變異規(guī)律和變異機(jī)制,有助于進(jìn)一步掌握北太平洋副熱帶和熱帶之間的相互作用,是海洋與大氣相互作用研究的熱點(diǎn)問題之一。目前對于潛沉率的研究大多是依賴于對模式數(shù)據(jù)的分析,利用觀測數(shù)據(jù)對潛沉率年際、年代際變異和變異機(jī)制的研究較為稀少,然而,Argo數(shù)據(jù)從2001年持續(xù)至今,隨著Argo觀測網(wǎng)絡(luò)的日漸完善,已經(jīng)可以提供十年以上的有效數(shù)據(jù)支持大尺度海洋過程的研究。本文利用2003-2013年逐月Argo觀測數(shù)據(jù)和1960-2010年SODA數(shù)據(jù),對北太平洋副熱帶西部模態(tài)水(the Subtropical Mode Water, STMW),東部模態(tài)水(the Eastern Subtropical Mode Water,ESTMW),以及中部模態(tài)水(the Central Mode Water,CMW)潛沉率的變異規(guī)律和變異機(jī)制進(jìn)行了系統(tǒng)的分析,并且得到了一些創(chuàng)新性的研究成果。首先,根據(jù)北太平洋副熱帶模態(tài)水STMW、ESTMW和CMW的潛沉區(qū)進(jìn)行劃分,選擇28°-35°N,140°E-180°作為STMW的潛沉區(qū),360-45°N,145°E-160°W為CMW潛沉區(qū),200-28°N,150°W-120°W為ESTMW潛沉區(qū)。潛沉區(qū)的潛沉率平均時(shí)間序列以及EOF分析的空間分布都顯示,STMW、ESTMW和CMW的潛沉率異常主要是來自側(cè)向輸運(yùn)項(xiàng)異常的貢獻(xiàn),體現(xiàn)了混合層深度異常對潛沉率異常的作用。通過控制晚冬溫度和鹽度的氣候態(tài)或者逐年的變化,北太平洋模態(tài)水潛沉區(qū)內(nèi)的晚冬混合層深度進(jìn)行控制變量分析顯示,在STMW和ESTMW潛沉區(qū)內(nèi),晚冬混合層溫度異常是混合層深度異常的主要因素,鹽度異常并不會(huì)帶來混合層深度的顯著變化,而在CMW潛沉區(qū)內(nèi),晚冬混合層鹽度異常表現(xiàn)出了和溫度異常相當(dāng)?shù)淖饔�。副熱帶模態(tài)水潛沉區(qū)的晚冬熱收支及CMW潛沉區(qū)的晚冬鹽度收支分析結(jié)果中,STMW和CMW潛沉區(qū)內(nèi),晚冬混合層熱收支變異與平流項(xiàng)變異和熱通量項(xiàng)都存在顯著正相關(guān)的關(guān)系,Argo數(shù)據(jù)顯示在2003-2013年間,熱收支的增強(qiáng)趨勢主要收到了來自平流項(xiàng)增強(qiáng)趨勢的貢獻(xiàn)。ESTMW潛沉區(qū)內(nèi),夾卷項(xiàng)與熱收支相關(guān)性顯著,并且2003-2013年間只有夾卷項(xiàng)與熱收支項(xiàng)都存在減弱的趨勢。鹽度收支的結(jié)果也體現(xiàn)了平流作用在CMW潛沉區(qū)的重要作用。SODA數(shù)據(jù)結(jié)果在模態(tài)水潛沉率年際變異規(guī)律和變異機(jī)制上都表現(xiàn)出了與Argo數(shù)據(jù)結(jié)果的一致性,結(jié)合1960-2009年SODA和2003-2013年Argo潛沉率結(jié)果進(jìn)行年代際變異規(guī)律進(jìn)行研究,1970s氣候突變前后,STMW、ESTMW和CMW潛沉率都存在明顯的突變,而隨著1980s后一段時(shí)間PDO指數(shù)變異趨勢的減弱,模態(tài)水潛沉率也保持著平緩的變化,直到2000年后PDO位相發(fā)生轉(zhuǎn)變,STMW和CMW產(chǎn)生了較強(qiáng)的減弱趨勢,而ESTMW也表現(xiàn)出了加強(qiáng)的趨勢,因此,2000年后可能存在氣候突變的新節(jié)點(diǎn),并且副熱帶模態(tài)水潛沉率的變異也開始響應(yīng)了這一突變。
[Abstract]:The subtropical modal water in the North Pacific is a low horizontal vortex water produced by the interaction of sea air interaction in the late winter. It can enter the anomalous signal of climate change into the perpetual density layer through submersible action and transport to the low latitude sea area, which has an important influence on the climate abnormality in the low latitude sea area. Therefore, the North Pacific is recognized and understood. The variation and variation mechanism of Subtropical Mode water submersible will help to further understand the interaction between the subtropics and the tropics in the North Pacific. It is one of the hot issues in the study of ocean and atmosphere interaction. The study of Interdecadal Variability and variation mechanisms is scarce. However, Argo data has been continued since 2001. With the gradual improvement of the Argo observation network, more than ten years of effective data can be provided to support large scale marine processes. This paper uses the monthly 2003-2013 year Argo observation data and 1960-2010 year SODA data to the North Pacific. The modal water (the Subtropical Mode Water, STMW), the eastern modal water (the Eastern Subtropical Mode Water, ESTMW), and the variation and variation mechanism of the middle modal water (the), are systematically analyzed and some innovative research results are obtained. First, according to North Taiping. The subtropical zone of Subtropical Mode water, STMW, ESTMW and CMW, is divided into 28 degrees -35 N, 140 degree E-180 degrees as the submersible area of STMW, 360-45 degree N, 145 degree E-160 W as CMW submersible area, 200-28 degree N, 150 degrees as submersible area. The rate anomaly mainly comes from the contribution of the lateral transport anomaly, reflecting the effect of the mixed layer depth anomaly on the anomaly of the submersible rate. By controlling the climate state of late winter temperature and salinity or year by year, the control variable analysis of the late winter mixed layer depth in the North Pacific modal water submersible area shows that it is late in the STMW and ESTMW submersible areas. The temperature anomaly in the mixed layer is the main factor of the depth anomaly of the mixed layer, and the salinity anomaly does not bring about a significant change in the depth of the mixed layer. In the CMW submersible area, the late winter mixture salinity anomaly shows the same effect as the temperature anomaly. The late winter heat budget of the subtropical zone and the late winter salinity of the CMW submersible area In the STMW and CMW submersible areas, there is a significant positive correlation between the heat budget variation in the late winter mixed layer and the advection variation and the heat flux. The Argo data show that during the 2003-2013 period, the trend of the increase of heat budget is mainly in the.ESTMW submersible area, which is from the advection term enhancement, and the correlation of the entrainment item and the heat budget is significant. In the past 2003-2013 years, only the reel and the heat budget have a weakening trend, and the results of the salinity budget also reflect the important role of the advection in the CMW submersible area. The results of.SODA data in the interannual variation and variation mechanism of the modal water submersible rate are consistent with the results of the Argo data, combined with 1960-2009 years of SODA and 20. The interdecadal variation of Argo submersible rate in 03-2013 was studied. Before and after the 1970s climate mutation, there was a significant mutation in the STMW, ESTMW and CMW submersible rates. With the decrease of the PDO index variation trend in the later period of 1980s, the mode water submersible rate also maintained a gentle change until the PDO phase changed after the 2000, STMW and CMW. There was a strong weakening trend, and the ESTMW showed a tendency to strengthen. Therefore, there might be a new node in the climate change after 2000, and the variation of Subtropical Mode water submersible rate began to respond to this mutation.

【學(xué)位授予單位】：中國科學(xué)院研究生院(海洋研究所)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P732.6;P731

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