不同测高产品对地中海中尺度涡探测的影响OA北大核心CSTPCD

Eddies play an important role in the transport of oceanic material,energy and momentum,as well as in ocean-air coupling systems and biochemical processes.Although a variety of ocean me-soscale eddy datasets can be used by researchers to study eddy properties of the global ocean,subtle differences in the way these datasets are generated often lead to large differences from one another.In order to better understand the difference of eddy detection capabilities between SLA and ADT data,it is necessary to compare the differences of eddy identification and eddy tracking parameters between the two altimeter data.In this paper,two widely accepted datasets,the Mesoscale Eddy Trajectory Atlas Product Version3.2 DT(META dataset)and the satellite altimeter-based ocean eddy identification and tracking dataset(Tian dataset),with daily temporal resolution and 1/4(°)×1/4(°)spatial resolution,are used as typical representatives of ADT and SLA,respectively.By identifying and tracking eddies in the Mediterranean Sea from 1993 to 2018,we systematically and quantitatively explored the influence of two kinds of altimeter data on the detection of eddies,which provides a reference for the development and progress of the marine mesoscale eddy dataset.The results show that the META captures more ed-dies with larger amplitude and smaller radius than the Tian dataset in terms of eddy identification.In the spatial domain,the META dataset is more likely to detect eddies in geographically active areas.In-terestingly,in the time domain,the number of eddies in the Tian dataset fluctuates and converges to-wards the META dataset,which may,to some extent,indicate that the META dataset is of more con-sistent quality.In terms of eddy tracking,compared with the META datasets,the Tian dataset is able to track longer-lived eddies without large jumps,thus allowing the eddies to show stronger robustness.Therefore,although both datasets are excellent at detecting and describing eddies,users should use the Tian datasets when the focus is on the eddy tracks,and META datasets when the target of interest is the individual eddies.