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Observation de la convection profonde en mer d'Irminger sur la période 2002-2015 par les flotteurs Argo

Abstract : The deep convection events are important because they form the intermediate and deep water masses feeding the global circulation. The Labrador Sea is the main site of deep convection in the North Atlantic Ocean and produces the intermediate Labrador Sea Water (LSW). The lrminger Sea was also cited but was forgotten during decades because of the lack of direct observations. This thesis provides the first description of the lrminger Sea deep convection at basin scale, thanks to the Argo data. Three convective events occurred in the lrminger Sea since 2010. During the 2011-2012 winter, the convection reached 1000 m and is explained by the sequence of the Greenland tip jets. The event of the 2O13-2O14 winter, reaching 130O m, is characterized by a strong preconditioning and a weak forcings by the Greenland tip jets.The convection event of the 2O14-2015 winter, reaching 1700 m, shows many of persistant tip jets. The advection of LSW from the Labrador Sea explains the deepest mixed layers observed during the last two winters. The results show that deep convection in the lrminger Sea is not a rare isolated event and plays a significant role on the climate balance.
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Submitted on : Tuesday, December 11, 2018 - 12:14:09 PM
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Anne Piron. Observation de la convection profonde en mer d'Irminger sur la période 2002-2015 par les flotteurs Argo. Sciences de la Terre. Université de Bretagne occidentale - Brest, 2015. Français. ⟨NNT : 2015BRES0059⟩. ⟨tel-01951216⟩



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