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Long-term variabilities of thermodynamic structure of the East China Sea Cold Eddy in summer 总被引：6，自引：0，他引：6
Based on more than 30 years observed sectional temperature data since the 1960s, and compared with multi-year wind and Changjiang (Yangtze) River discharge data, spatial-temporal variations of the East China Sea Cold Eddy (ECSCE) in summer was analyzed in relationship to ocean circulation and local atmospheric circulation. Empirical Orthogonal Function (EOF) and Singular Value Decomposition (SVD) analyseswere applied to this study. The results show that: l) The ECSCE in summer possesses significant interannual variabilities, which are directly associated with oceanic and atmospheric circulation anomaly. Main fluctuations demonstrate their falling in basically with E1 Nino events (interannual) and interdecadal variability. 2) The ECSCE in summer is closely related to the variation of the Yellow Sea Warm Current (YSWC) and the Changjiang River discharge. The stronger the YSWC, the more intensive the ECSCE with its center shifting westward,and vice versa. However, a negative correlation between the Changjiang River discharge and the ECSCE strength is shown. The ECSCE was strengthened after the abrupt global climate change affected by the interdecadal variation of the YSWC. 3) SVD analysis suggested a high correlation between the variation of the ECSCE in summer and the anomalous cyclonic atmospheric circulation over the ECS. Intensification of the cyclonic wind strengthens the ECSCE, and vice versa. 4) The cyclonic atmospheric circulation has dominant influence on the interannual variation of the ECSCE, and the influence of the ocean circulation takes the second in. The ECSCE was usually stronger in E1 Nifio years affected by strong cyclonic circulation in the atmosphere. The variation in strength of the ECSCE resulted from the joint effect of both oceanic and atmospheric circulation. 相似文献
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The inter-annual variability of the Yellow Sea Warm Current surface axis and its influencing factors 总被引：1，自引：0，他引：1
Based on the Pathfinder sea surface temperature(PFSST),the surface axis and its pattern of the Yellow Sea Warm Current(YSWC) are discussed.A structure of double-warm-tongue is found in February and it varies in different years.Two indexes are calculated to represent the westward shift(WSI) and northward extension(NEI) of the warm water in the Yellow Sea(YS).Wavelet analysis illustrates that the WSI and NEI have prominent periods of 3-6 years and 3-4 years,respectively.The Empirical Orthogonal Function(EOF) ... 相似文献
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Seasonality and causes of the Yellow Sea Warm Current 总被引：1，自引：0，他引：1
To study the seasonality and causes of the Yellow Sea Warm Current (YSWC) in detail, rotated empirical orthogonal function (REOF) and extended associate pattern analysis are adopted with daily sea surface salinity (SSS), sea surface temperature (SST) and sea surface height (SSH) datasets covering 1126 days from American Navy Experimental Real-Time East Asian Seas Ocean Nowcast System in the present paper. Results show that in the Yellow and East China Seas, the YSWC is a mean barotropic flow as compensation of winter-monsoon-driven surface currents, which has been directly observed. When East Asia winter monsoon weakens, so do the meridional pressure gradient of the surface seawater and the YSWC, while the transversal pressure gradient changes rather slowly that results in the YSWC left turning. In addition, there is southward mean flow compensation of summer-monsoon-driven surface currents, which actually was also directly ob-served. 相似文献
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An N-shape thermal front in the western South Yellow Sea (YS) in winter was detected using Advanced Very High Resolution Radiation
(AVHRR) Sea Surface Temperature data and in-situ observations with a merged front-detecting method. The front, which exists
from late October through early March, consists of western and eastern wings extending roughly along the northeast-southwest
isobaths with a southeastward middle segment across the 20–50 m isobaths. There are north and south inflexions connecting
the middle segment with the western and eastern wings, respectively. The middle segment gradually moves southwestward from
November through February with its length increasing from 62 km to 107 km and the southern inflexion moving from 36.2°N to
35.3°N. A cold tongue is found to coexist with the N-shape front, and is carried by the coastal jet penetrating southward
from the tip of the Shandong Peninsula into the western South YS as revealed by a numerical simulation. After departing from
the coast, the jet flows as an anti-cyclonic recirculation below 10 m depth, trapping warmer water originally carried by the
compensating Yellow Sea Warm Current (YSWC). A northwestward flowing branch of the YSWC is also found on the lowest level
south of the front. The N-shape front initially forms between the cold tongue and warm water involved in the subsurface anti-cyclonical
recirculation and extends upwards to the surface through vertical advection and mixing. Correlation analyses reveal that northerly
and easterly winds tend to be favorable to the formation and extension of the N-shape front probably through strengthening
of the coastal jet and shifting the YSWC pathway eastward, respectively. 相似文献
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