The Reduction Of Plankton Biomass Induced By Mesoscale Stirring: A Modeling Study In The Benguela Upwelling

ISI Document Delivery No.: 290OT Times Cited: 0 Cited Reference Count: 50 Cited References: Artale V, 1997, PHYS FLUIDS, V9, P3162, DOI 10.1063/1.869433 Aurell E, 1997, J PHYS A-MATH GEN, V30, P1, DOI 10.1088/0305-4470/30/1/003 Boffetta G, 2001, PHYSICA D, V159, P58, DOI 10.1016/S0167-2789(01)00330-X Brink K., 1991, J GEOPHYS RES, V14, P637 Calil PHR, 2010, J GEOPHYS RES-OCEANS, V115, DOI 10.1029/2009JC005360 Carr ME, 2002, DEEP-SEA RES PT II, V49, P59 Condie S., 2006, MARINE FRESHWATER RE, V57, P1 Correa-Ramirez MA, 2007, GEOPHYS RES LETT, V34, DOI 10.1029/2007GL029541 Demarcq H, 2003, AFR J MAR SCI, V25, P363, DOI 10.2989/18142320309504022 Doney SC, 1996, DEEP-SEA RES PT II, V43, P591, DOI 10.1016/0967-0645(95)00104-2 d'Ovidio F, 2009, DEEP-SEA RES PT I, V56, P15, DOI 10.1016/j.dsr.2008.07.014 d'Ovidio F, 2004, GEOPHYS RES LETT, V31, DOI 10.1029/2004GL020328 Gruber N, 2011, NAT GEOSCI, V4, P787, DOI [10.1038/ngeo1273, 10.1038/NGEO1273] Gutknecht E, 2013, BIOGEOSCIENCES, V10, P3559, DOI 10.5194/bg-10-3559-2013 Haller G, 2000, PHYSICA D, V147, P352, DOI 10.1016/S0167-2789(00)00142-1 Hernandez-Carrasco I, 2012, J GEOPHYS RES-OCEANS, V117, DOI 10.1029/2012JC008222 Hernandez-Carrasco I, 2011, OCEAN MODEL, V36, P208, DOI 10.1016/j.ocemod.2010.12.006 Hurtt GC, 1996, DEEP-SEA RES PT II, V43, P653, DOI 10.1016/0967-0645(96)00007-0 Hutchings L, 2009, PROG OCEANOGR, V83, P15, DOI 10.1016/j.pocean.2009.07.046 Joseph B, 2002, J ATMOS SCI, V59, P1198, DOI 10.1175/1520-0469(2002)0592.0.CO;2 Kai ET, 2009, P NATL ACAD SCI USA, V106, P8245, DOI 10.1073/pnas.0811034106 Koh TY, 2002, CHAOS, V12, P382, DOI 10.1063/1.1480442 Kone V, 2005, GLOBAL BIOGEOCHEM CY, V19, DOI 10.1029/2004GB002427 Lachkar Z, 2011, BIOGEOSCIENCES, V8, P2961, DOI 10.5194/bg-8-2961-2011 Lehahn Y, 2007, J GEOPHYS RES-OCEANS, V112, DOI 10.1029/2006JC003927 Lett C, 2007, MAR ECOL PROG SER, V347, P247, DOI 10.3354/meps06982 Levy M, 2001, J MAR RES, V59, P535, DOI 10.1357/002224001762842181 Mackas D., 2006, SEA, V14a MacKiver W., 2009, PHYS REV E, V79 Mahadevan A, 2000, J GEOPHYS RES-OCEANS, V105, P1209, DOI 10.1029/1999JC900216 Martin AP, 2003, PROG OCEANOGR, V57, P125, DOI 10.1016/S0079-6611(03)00085-5 McGillicuddy DJ, 2007, SCIENCE, V316, P1021, DOI 10.1126/science.1136256 Melin F, 2007, REMOTE SENS ENVIRON, V110, P192, DOI 10.1016/j.rse.2007.02.026 Monteiro P., 2009, CARBON NUTR FLUXES C Neufeld Z., 2009, CHEM BIOL PROCESSES OKUBO A, 1971, DEEP-SEA RES, V18, P789, DOI 10.1016/0011-7471(71)90046-5 Oschlies A, 1999, GLOBAL BIOGEOCHEM CY, V13, P135, DOI 10.1029/98GB02811 Oschlies A, 1998, NATURE, V394, P266, DOI 10.1038/28373 Pasquero C., 2004, SHALLOW FLOWS Rossi V, 2009, NONLINEAR PROC GEOPH, V16, P557 Rossi V, 2008, GEOPHYS RES LETT, V35, DOI 10.1029/2008GL033610 Sandulescu M, 2007, NONLINEAR PROC GEOPH, V14, P443 Sandulescu M, 2008, ECOL COMPLEX, V5, P228, DOI 10.1016/j.ecocom.2008.01.003 Shannon V, 2006, LAR MAR ECOSYST, V14, P1 Sudre J, 2008, OCEAN DYNAM, V58, P101, DOI 10.1007/s10236-008-0134-9 Tel T, 2005, PHYS REP, V413, P91, DOI 10.1016/j.physrep.2005.01.005 Titaud O, 2011, TELLUS A, V63, P1038, DOI 10.1111/j.1600-0870.2011.00533.x Veitch J, 2009, PROG OCEANOGR, V83, P296, DOI 10.1016/j.pocean.2009.07.008 Waugh D.W., 2008, GEOPHYS RES LETT, V35 Waugh DW, 2006, J PHYS OCEANOGR, V36, P526, DOI 10.1175/JPO2865.1 Hernandez-Carrasco, Ismael Rossi, Vincent Hernandez-Garcia, Emilio Garcon, Veronique Lopez, Cristobal MINECO; FEDER [FIS2007-60327, CTM2012-39025-C02-01]; CNES I.H.-C. was supported by a FPI grant from MINECO to visit LEGOS. We acknowledge support from MINECO and FEDER through projects FISICOS (FIS2007-60327) and ESCOLA (CTM2012-39025-C02-01). V.G. thanks CNES funding through Hiresubcolor project. We are also grateful to J. Sudre for providing us velocity datasets both from ROMS and from the combined satellite product. Ocean color data were produced by the SeaWiFS project at GES and were obtained from DAAC. 0 PERGAMON-ELSEVIER SCIENCE LTD OXFORD DEEP-SEA RES PT IRecent studies, both based on remote sensed data and coupled models, showed a reduction of biological productivity due to vigorous horizontal stirring in upwelling areas. In order to better understand this phenomenon, we consider a system of oceanic flow from the Benguela area coupled with a simple biogeochemical model of Nutrient-Phyto-Zooplankton (NPZ) type. For the flow three different surface velocity fields are considered: one derived from satellite altimetry data, and the other two from a regional numerical model at two different spatial resolutions. We compute horizontal particle dispersion in terms of Lyapunov exponents, and analyzed their correlations with phytoplankton concentrations. Our modeling approach confirms that in the south Benguela there is a reduction of biological activity when stirring is increased. Two-dimensional offshore advection and latitudinal difference in primary production, also mediated by the flow, seem to be the dominant processes involved. We estimate that mesoscale processes are responsible for 30-50% of the offshore fluxes of biological tracers. In the northern area, other factors not taken into account in our simulation are influencing the ecosystem. We suggest explanations for these results in the context of studies performed in other eastern boundary upwelling areas. (C) 2013 Elsevier Ltd. 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