首页|Meridional deflection of global eddy propagation derived from tandem altimetry:Mechanism and implication

Meridional deflection of global eddy propagation derived from tandem altimetry:Mechanism and implication

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A common view on meridional deflection of eddy propagation is poleward for cyclones and equatorward for anticyclones.This widely accepted polarity-sensitive pattern has been increasingly undermined given that it is systematically violated on both zonal and regional scales as recently reported.Here,we approach the problem by exploring these violations in terms of eddy effects of spatiotemporal geostrophy,thermal fading,and flow dragging,yielding the following main conclusions.(1)The polarity-dependent deflection discrepancy is a pseudo feature resulting from a biased fit to the normalized eddy tracks which are spatially asymmetric(though azimuthally symmetric)between the two signs;Instead,the primary pattern of eddy deflection appears to be geographically correlated and polarity independent.(2)Geostrophic adjustment plays a critical role in defining the meridional movement of an eddy.Specifically,a consistent poleward(equatorward)trajectory bending of spatially(temporally)ageostrophic eddies is observed irrespective of their polarity.(3)The mechanism of eddy deflection is also determined by its zonal propagation direction.Westward propagating eddies are substantially affected by thermal fading,while opposite ones by flow dragging.A realistic and comprehensive understanding of eddy deflection mechanisms serves as a significant contribution to the prediction of eddy trajectory,and the protection of ocean environment.

Mesoscale eddiesEddy propagationEddy meridional deflectionSatellite observationGeostrophic adjustment

Ge CHEN、Xiaoyan CHEN

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Frontiers Science Center for Deep Ocean Multispheres and Earth System,School of Marine Technology,Ocean University of China,Qingdao 266100,China

Laboratory for Regional Oceanography and Numerical Modeling,Laoshan Laboratory Qingdao 266237,China

国家自然科学基金Science and Technology Innovation Fund of Laoshan LaboratoryInternational Research Center of Big Data for Sustainable Development Goals

42030406LSKJ202204301CBAS2022GSP01

2024

10.1007/s11430-023-1264-8

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(3)
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