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Decadal coupling between storm tracks and sea surface temperature in the Southern Hemisphere midlatitudes

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Abstract

The relationships between the seasonal mean storm-track anomalies and sea surface temperature anomalies (SSTAs) in the midlatitude Southern Hemisphere (SH) on the decadal time scale are investigated using the lagged maximum covariance analysis (MCA). It shows that the coupling between storm-track anomalies and SSTAs is most prominent in austral summer (January–March, JFM). Firstly, large cold SSTAs in the western South Indian Ocean (SIO), corresponding to the strengthened SST front on the equator side, substantially intensify the storm-track activity manifested by the increased low-level poleward transient eddy heat flux over the entire SH. The coherent intensification of the atmospheric baroclinicity and the subtropical jet associated with such strengthened SST front provides baroclinic energy for the growth of synoptic eddies. Further, the intensified storm-track activity induces large cold SSTAs in the South Atlantic (SA), the SIO and the subtropical South Pacific (SP), primarily via anomalous net surface heat fluxes. The mean SST advection by the anomalous Ekman current also contributes to the cold SSTAs in the SA, which is related to the anomalous westerlies induced by the anomalous storm-track activity.

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Acknowledgements

This work is supported by National Natural Science Foundation of China (NSFC) Projects (41906015), National Key Research and Development Program of China (2019YFA0607001, 2019YFC1509100), National Postdoctoral Program for Innovative Talents Foundation of China (861805033113) and Strategic Priority Research Program of Chinese Academy of Sciences (XDB40000000).

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Authors and Affiliations

  1. Physical Oceanography Laboratory/CIMST, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, 238 Songling Road, Qingdao, 266100, People’s Republic of China

    Li Zhang, Bolan Gan, Chuan-Yang Wang, Lixin Wu & Wenju Cai

  2. CSIRO Oceans and Atmosphere Flagship, Aspendale, VIC, 3195, Australia

    Wenju Cai

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Zhang, L., Gan, B., Wang, CY. et al. Decadal coupling between storm tracks and sea surface temperature in the Southern Hemisphere midlatitudes. Clim Dyn 56, 783–798 (2021). https://doi.org/10.1007/s00382-020-05503-z

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