TY - JOUR T1 - Phytoplankton dynamics in the southern New Caledonian lagoon during a southeast trade winds event A1 - Neveux,Jacques A1 - Lefebvre,Jean-Pierre A1 - Le Gendre,Romain A1 - Dupouy,Cecile A1 - Gallois,Francis A1 - Courties,Claude A1 - Gerard,Philippe A1 - Fernandez,Jean-Michel A1 - Ouillon,Sylvain AD - Univ Paris 06, UMR 7621, Observ Oceanol Banyuls, F-66651 Banyuls Sur Mer, France. AD - CNRS, UMR7621, Lab Oceanog Biol Banyuls, F-66651 Banyuls Sur Mer, France. AD - UR Camelia UR 103, Inst Rech Dev, Noumea 98848, New Caledonia. AD - Stn IFREMER, Lab Environm Ressources Normandie, F-14520 Port En Bessin, France. AD - US191, Inst Rech Dev, Noumea 98848, New Caledonia. AD - CNRS, UMS 2348, Observ Oceanol, F-66651 Banyuls Sur Mer, France. AD - Univ Paris 06, UMS 2348, Observ Oceanol, F-66651 Banyuls Sur Mer, France. AD - Univ Toulouse, IRD, UPS OMP PCA, LEGOS, F-31400 Toulouse, France. UR - https://archimer.ifremer.fr/doc/00013/12437/ DO - 10.1016/j.jmarsys.2010.05.010 KW - Chlorophyll KW - Phycoerythrin KW - Flow cytometry KW - Phytoplankton KW - In vivo fluorescence KW - Growth rate KW - Trade winds KW - Lagoon KW - Internal wave KW - New Caledonia N2 - During the Echolag cruise (13 February-8 March 2007), the effect of 16-30 knot trade winds on abundance, community structure and dynamics of phytoplankton was investigated in the southern part of the New Caledonian coral reefs and surrounding oceanic waters. In this area, the coral reefs form two horn-like structures (hereinafter referred to as 'horn reefs'), oriented south-east, and separated by a relatively deep valley. Three repeated samplings at one week intervals of a 32 station array showed that trade winds induce surface water cooling and significant enrichment of mid- and bottom waters above the reef shelf. This enrichment appeared as the result of a general rise of the oceanic thermocline and nitracline due to the combination of trade winds and tidally-generated internal waves between the horn reefs. It was accompanied by a factor of 1.5 and 2.3 mean increase for the chlorophyll concentration and picoplankton-nanoplankton cell number, respectively. From diel variations of in vivo chlorophyll a fluorescence and hourly sampling, phytoplankton gross growth rate was estimated to be 1-1.35 divisions per day and was quasi balanced with phytoplankton mortality for a 24 h period. Y1 - 2010/09 PB - Elsevier Science Bv JF - Journal Of Marine Systems SN - 0924-7963 VL - 82 IS - 4 SP - 230 EP - 244 ID - 12437 ER -