黑潮延伸體的變化及其與北太平洋風(fēng)暴軸的關(guān)系
發(fā)布時間：2019-03-22 16:51
【摘要】：利用18年的AVSIO衛(wèi)星高度計和SODA資料，分析了黑潮延伸體急流及其中尺度渦能量(EKE)的變化特征。結(jié)果顯示，黑潮延伸體急流在經(jīng)向上存在從變寬（雙支）到變窄（單支）的年代際振蕩信號。這與中尺度渦渦動能量在黑潮延伸體區(qū)域強(qiáng)迫而成的異常的低頻海表面高度（SSH）偶極子模態(tài)有關(guān)。當(dāng)渦動強(qiáng)迫的偶極子呈北正南負(fù)（負(fù)位相）的結(jié)構(gòu)時，與氣候態(tài)的海表面高度場疊加會使黑潮延伸體區(qū)域SSH梯度減弱，黑潮延伸體急流變寬并表現(xiàn)出雙支結(jié)構(gòu)，而當(dāng)偶極子模態(tài)呈北負(fù)南正（正位相）結(jié)構(gòu)時，黑潮延伸體急流則變?yōu)檎膯沃ЫY(jié)構(gòu)。這可以認(rèn)為是黑潮延伸體自身低頻波動、高頻中尺度渦和平均流之間相互作用的結(jié)果。 除了自身相互作用外，大尺度的海氣相互作用因子也會對黑潮延伸體產(chǎn)生影響。因此，本文使用回歸分析等方法分析了黑潮延伸體EKE的強(qiáng)度和位置與北太平洋風(fēng)暴軸之間的關(guān)系。結(jié)果表明，黑潮延伸體中尺度渦強(qiáng)時有利于北太平洋風(fēng)暴軸增強(qiáng)，而EKE位置偏北(南)時對應(yīng)的北太平洋風(fēng)暴軸也偏北(南)，同時當(dāng)EKE的位置偏東（偏西）時北太平洋風(fēng)暴軸則西退（東移）。此外，北太平洋風(fēng)暴軸的變化對黑潮延伸體也有一定的反饋作用，黑潮延伸體中尺度渦EKE強(qiáng)度的變化與北太平洋風(fēng)暴軸EOF第一和第三個模態(tài)（第二個模態(tài)）回歸的海表面高度距平模態(tài)有明顯的3-4年滯后的正（負(fù)）相關(guān)，，而黑潮延伸體中尺度渦EKE位置的變化則相反。這種滯后相關(guān)可能是通過北太平洋風(fēng)暴軸驅(qū)動的遙相關(guān)型環(huán)流改變海表面風(fēng)應(yīng)力旋度并強(qiáng)迫出的海表面高度距平的西傳導(dǎo)致的。
[Abstract]:Based on the AVSIO altimeter and SODA data of 18 years, the variation characteristics of jet and mesoscale vortex energy (EKE) of Kuroshio extensor are analyzed. The results show that there is an inter-decadal oscillation signal from widening (double branch) to narrowing (single branch) in the meridional direction of the Kuroshio extensor jet. This is related to the anomalous low-frequency sea surface height (SSH) dipole mode caused by the forcing of the mesoscale vortex energy in the Kuroshio extension region. When the vortex-forced dipole is north positive and negative (negative phase), the SSH gradient of the Kuroshio extension region will be weakened and the jet current of the Kuroshio extension body will be broadened and the two-branch structure will be displayed when the sea surface height field superimposed with the climatological state will weaken the Kuroshio extension region. When the dipole mode is north-negative-south positive (positive phase), the Kuroshio extensor jet becomes a narrow one-branch structure. This can be considered as the result of the interaction between low-frequency fluctuations, high-frequency mesoscale vortices and mean currents of the Kuroshio extensor itself. In addition to self-interaction, large-scale air-sea interaction factors also affect the extension of Kuroshio. Therefore, the relationship between the strength and position of the Kuroshio extensor EKE and the storm axis in the North Pacific is analyzed by regression analysis and other methods. The results show that the mesoscale vortex intensity of the Kuroshio extension is beneficial to the enhancement of the storm axis in the North Pacific Ocean, and the corresponding North Pacific Storm Axis in the north (south) of the EKE position is also north (south). At the same time, when the position of EKE is eastward (westward), the north Pacific storm axis retreats westward (eastward). In addition, the variation of the storm axis in the North Pacific also has a feedback effect on the extension of the Kuroshio. The variation of the mesoscale vortex EKE intensity of the Kuroshio extension is positively (negatively) correlated with the sea surface height anomaly mode regressed by the first and third modes (the second mode) of the North Pacific Storm Axis EOF, and there is a significant positive (negative) correlation between the 3-4 year lag and the sea surface height anomaly mode. However, the change of the mesoscale vortex EKE position of the Kuroshio extensional body is opposite. This hysteresis correlation may be caused by the westward propagation of the sea surface height anomaly driven by the teleconnective circulation driven by the storm axis of the North Pacific, which changes the wind stress curl on the sea surface and forces the sea surface height out of the sea to travel westward.
【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】：P731.27;P732
本文編號：2445760
[Abstract]:Based on the AVSIO altimeter and SODA data of 18 years, the variation characteristics of jet and mesoscale vortex energy (EKE) of Kuroshio extensor are analyzed. The results show that there is an inter-decadal oscillation signal from widening (double branch) to narrowing (single branch) in the meridional direction of the Kuroshio extensor jet. This is related to the anomalous low-frequency sea surface height (SSH) dipole mode caused by the forcing of the mesoscale vortex energy in the Kuroshio extension region. When the vortex-forced dipole is north positive and negative (negative phase), the SSH gradient of the Kuroshio extension region will be weakened and the jet current of the Kuroshio extension body will be broadened and the two-branch structure will be displayed when the sea surface height field superimposed with the climatological state will weaken the Kuroshio extension region. When the dipole mode is north-negative-south positive (positive phase), the Kuroshio extensor jet becomes a narrow one-branch structure. This can be considered as the result of the interaction between low-frequency fluctuations, high-frequency mesoscale vortices and mean currents of the Kuroshio extensor itself. In addition to self-interaction, large-scale air-sea interaction factors also affect the extension of Kuroshio. Therefore, the relationship between the strength and position of the Kuroshio extensor EKE and the storm axis in the North Pacific is analyzed by regression analysis and other methods. The results show that the mesoscale vortex intensity of the Kuroshio extension is beneficial to the enhancement of the storm axis in the North Pacific Ocean, and the corresponding North Pacific Storm Axis in the north (south) of the EKE position is also north (south). At the same time, when the position of EKE is eastward (westward), the north Pacific storm axis retreats westward (eastward). In addition, the variation of the storm axis in the North Pacific also has a feedback effect on the extension of the Kuroshio. The variation of the mesoscale vortex EKE intensity of the Kuroshio extension is positively (negatively) correlated with the sea surface height anomaly mode regressed by the first and third modes (the second mode) of the North Pacific Storm Axis EOF, and there is a significant positive (negative) correlation between the 3-4 year lag and the sea surface height anomaly mode. However, the change of the mesoscale vortex EKE position of the Kuroshio extensional body is opposite. This hysteresis correlation may be caused by the westward propagation of the sea surface height anomaly driven by the teleconnective circulation driven by the storm axis of the North Pacific, which changes the wind stress curl on the sea surface and forces the sea surface height out of the sea to travel westward.
【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】：P731.27;P732
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