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Relative contributions of temperature and salinity to steric sea level over the South China Sea

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Journal of Oceanology and Limnology 2022年第2期40卷 428-437页

作者： Jin SHA Xiaoming LI Xiaohai YAN Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Hainan Key Laboratory of Earth Observation Sanya 502022China Center for Remote Sensing College of EarthOcean and EnvironmentUniversity of DelawareNewark 19711DEUSA Joint Institute for Coastal Research and Management University of Delaware/Xiamen UniversityUSA/China

The relative contributions of surface temperature and salinity to steric sea-level variations are investigated using satellite observations and reanalysis *** defi ning a contribution factor,the relative roles of thermal and haline steric height variations are quantifi ed over the South China Sea(SCS).The thermosteric height dominates the steric sea level variation in the northern SCS deep basin,while the contribution of the halosteric height increases *** investigation reveals that this transition is related to the meridional imbalance of surface heat flux and precipitation *** revealed steric constitution distribution is not confi ned to the surface but extends within the upper layer to approximately 50m depth,and then the thermosteric component dominates from the depth *** results of this study clarify the steric sea level constitution over the SCS,benefit the understanding of sea-level variations at the regional scale,and may further facilitate multisensor remote sensing data mining studies.

关键词： South China Sea(SCS) steric height steric constitution

The water mass variability and southward shift of the Southern Hemisphere mid-depth supergyre

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Acta Oceanologica Sinica 2013年第11期32卷 74-81页

作者： DUAN Yongliang HOU Yijun LIU Hongwei LIU Yahao Center for Ocean and Climate Research First Institute of OceanographyState Oceanic Administration Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences

The Southern Hemisphere subtropical supergyre at intermediate depths connects all three ocean basins and plays a significant role in responding and conveying the climate-change-related variations in the glob- al ocean. On the basis of the Simple Ocean Data Assimilation/SODA） ocean reanalysis, the thermohaline variability and southward shift of the mid-depth supergyre are demonstrated. The steric height of the sub- surface relative to 1 500 m （400-1 500 m） from the SODA depicts exactly the flow patterns and variability of the oceanic supergyre. During 1958-2007 the water masses in the gyre interiors become cooler/fresher, with the significant exceptions of the Agulhas Current system and Agulhas leakage. The results also exhibit a pronounced strengthening of the inter-basin connection of the supergyre, and the strongest southward shift, by about 2.5° over the whole period, occurs in the central-south Pacific, which is associated with the changes in the basin-scale wind forcing.

关键词： Southern Hemisphere supergyre thermohaline tendency steric height South Pacific

Slowdown of sea surface height rises in the Nordic seas and related mechanisms

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Acta Oceanologica Sinica 2017年第8期36卷 20-33页

作者： SHI Wenqi ZHAO Jinping LIAN Xihu WANG Xiaoyu CHEN Weibin School of Marine Environment Ocean University of ChinaQingdao 266100China National Marine Environmental Monitoring Center Dalian 116023China Numerical Simulation Laboratory North China Sea Marine Forecasting CenterQingdao 11600China

A slowdown of sea surface height （SSH） rise occurred in the Nordic （GIN） seas around 2004. In this study, SSH satellite data and constructed steric height data for the decades before and after 2004 （i.e., May 1994 to April 2014） were used for comparative analysis. The findings indicate that the rate of slowdown of SSH rises in the GIN seas （3.0 mm/a） far exceeded that of the global mean （0.6 mm/a）. In particular, the mean steric height of the GIN seas increased at a rate of 4.5 mm/a and then decreased at a slower pace. This was the main factor responsible for the stagnation of the SSH rises, while the mass factor only increased slightly. The Norwegian Sea particularly experienced the most prominent slowdown in SSH rises, mainly due to decreased warming of the 0-600 m layer. The controlling factors of this decreased warming were cessation in the increase of volume of the Atlantic inflow and stagnation of warming of the inflow. However, variations in air-sea thermal flux were not a major factor. In the recent two decades, mean halosteric components of the GIN seas decreased steadily and remained at a rate of 2 mm/a or more because of increased flow and salinity of the Atlantic inflow during the first decade, and reduction in freshwater inputs from the Arctic Ocean in the second decade.

关键词： Nordic seas sea surface height steric height slowdown in sea level rises