@article{fdi:010072686, title = {{V}ariability and dynamics of the {Y}ucatan upwelling : high-resolution simulations}, author = {{J}ouanno, {J}ulien and {P}allas-{S}anz, {E}. and {S}heinbaum, {J}.}, editor = {}, language = {{ENG}}, abstract = {{T}he {Y}ucatan shelf in the southern {G}ulf of {M}exico is under the influence of an upwelling that uplifts cool and nutrient rich waters over the continental shelf. {T}he analysis of a set of high-resolution (x=y approximate to 2.8 km) simulations of the {G}ulf of {M}exico shows two dominant modes of variability of the {Y}ucatan upwelling system: (1) a low-frequency mode related to variations in position and intensity of the {L}oop {C}urrent along the shelf, with upwelling intensified when the {L}oop {C}urrent is strong and approaches to the {Y}ucatan shelf break and (2) a high-frequency mode with peak frequency in the 6-10 days band related to wind-forced coastal waves that force vertical velocities along the eastern {Y}ucatan shelf break. {T}o first order, the strength and position of the {L}oop {C}urrent are found to control the intensity of the upwelling, but we show that high-frequency winds also contribute (approximate to 17%) to a net input of cool waters (<22.5 degrees {C}) on the {Y}ucatan shelf. {F}inally, although more observational studies are needed to corroborate the topographic character of the {Y}ucatan upwelling system, this study reveals the key role played by a notch along the {Y}ucatan shelf break: a sensitivity simulation without the notch shows a 55% reduction of the upwelling.}, keywords = {upwelling ; {Y}ucatan ; {G}ulf of {M}exico ; {NEMO} ; shelf ; {L}oop {C}urrent ; {GOLFE} {DU} {MEXIQUE} ; {YUCATAN}}, booktitle = {}, journal = {{J}ournal of {G}eophysical {R}esearch. {O}ceans}, volume = {123}, numero = {2}, pages = {1251--1262}, ISSN = {2169-9275}, year = {2018}, DOI = {10.1002/2017jc013535}, URL = {https://www.documentation.ird.fr/hor/fdi:010072686}, }