Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Journal of Advances in Modeling Earth Systems 680-699 ZONE TROPICALE 2014 fdi:010062682 ENG Journal of Advances in Modeling Earth Systems 1942-2466 ISI:000344387900012 3 10.1002/2014ms000327 https://www.documentation.ird.fr/hor/fdi:010062682 https://www.documentation.ird.fr/intranet/publi/2014/12/010062682.pdf 6 Horizon (IRD) Climate modes, such as the El Nino Southern Oscillation (ENSO), influence Tropical Cyclones (TCs) interannual activity through their effect on large-scale atmospheric environment. These climate modes also induce interannual variations of subsurface oceanic stratification, which may also influence TCs. Changes in oceanic stratification indeed modulate the amplitude of TCs-induced cooling, and hence the negative feedback of air-sea interactions on the TC intensity. Here we use a dynamical downscaling approach that couples an axisymmetric TC model to a simple ocean model to quantify this interannual oceanic control on TC activity. We perform twin experiments with contrasted oceanic stratifications representative of interannual variability in each TC-prone region. While subsurface oceanic variations do not significantly affect the number of moderate (Category 3 or less) TCs, they do induce a 30% change of Category 5 TC-days globally, and a 70% change for TCs exceeding 85 m s(-1). TCs in the western Pacific and the southwestern Indian Ocean are most sensitive to oceanic interannual variability (with a similar to 10 m s(-1) modulation of the intensity of strongest storms at low latitude), owing to large upper ocean variations in response to ENSO. These results imply that a representation of ocean stratification variability should benefit operational forecasts of intense TCs and the understanding of their climatic variability. 032 ; 020 ; 021 UR182