%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Vincent, E. M.
%A Madec, G.
%A Lengaigne, Matthieu
%A Vialard, Jérôme
%A Koch Larrouy, Ariane
%T Influence of tropical cyclones on sea surface temperature seasonal cycle and ocean heat transport
%D 2013
%L fdi:010061154
%G ENG
%J Climate Dynamics
%@ 0930-7575
%K Tropical cyclones ; Ocean heat transport ; Seasonal cycle ; SST
%M ISI:000324812200019
%N 7-8
%P 2019-2038
%R 10.1007/s00382-012-1556-0
%U https://www.documentation.ird.fr/hor/fdi:010061154
%> https://www.documentation.ird.fr/intranet/publi/2013/10/010061154.pdf
%V 41
%W Horizon (IRD)
%X Recent studies suggested that tropical cyclones (TCs) contribute significantly to the meridional oceanic heat transport by injecting heat into the subsurface through mixing. Here, we estimate the long-term oceanic impact of TCs by inserting realistic wind vortices along observed TCs tracks in a 1/2A degrees resolution ocean general circulation model over the 1978-2007 period. Warming of TCs' cold wakes results in a positive heat flux into the ocean (oceanic heat uptake; OHU) of similar to 480 TW, consistent with most recent estimates. However, similar to 2/5 of this OHU only compensates the heat extraction by the TCs winds during their passage. Another similar to 2/5 of this OHU is injected in the seasonal thermocline and hence released back to the atmosphere during the following winter. Because of zonal compensations and equatorward transport, only one-tenth of the OHU is actually exported poleward (46 TW), resulting in a marginal maximum contribution of TCs to the poleward ocean heat transport. Other usually neglected TC-related processes however impact the ocean mean state. The residual Ekman pumping associated with TCs results in a sea-level drop (rise) in the core (northern and southern flanks) of TC-basins that expand westward into the whole basin as a result of planetary wave propagation. More importantly, TC-induced mixing and air-sea fluxes cool the surface in TC-basins during summer, while the re-emergence of subsurface warm anomalies warms it during winter. This leads to a similar to 10 % reduction of the sea surface temperature seasonal cycle within TCs basins, which may impact the climate system.
%$ 032 ; 020 ; 021