Consulta: creatorFacets:"Alvarez, M."
Registros recuperados: 6
Data/hora: 09/06/2024 04:16:30

Decadal biogeochemical changes in the subtropical Indian Ocean associated with Subantarctic Mode Water
Provedor de dados: 5
Autores: Alvarez, M.; Tanhua, T.; Brix, H.; Lo Monaco, C.; Metzl, N.; Mcdonagh, E. L.; Bryden, H. L.
Within the Subantarctic Mode Water (SAMW) density level, we study temporal changes in salinity, nutrients, oxygen and TTD (Transit Time Distribution) ages in the western (W) and eastern (E) subtropical gyre of the Indian Ocean (IO) from 1987 to 2002. Additionally, changes in Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC) are evaluated between 1995 and 2002. The mechanisms behind the detected changes are discussed along with the results from a hindcast model run (Community Climate System Model). The increasing salinity and decreasing oxygen trends from 1960 to 1987 reversed from 1987 to 2002 along the gyre. In the W-IO a decreasing trend in TTD ages points to a faster delivery of SAMW, thus less biogenic matter remineralization, explaining the...
Tipo: Text
Palavras-chave: Indian Ocean; Subantarctic Mode Water; Biogeochemistry.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00253/36400/34942.pdf

Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches
Provedor de dados: 5
Autores: Alvarez, M.; Lo Monaco, C.; Tanhua, T.; Yool, A.; Oschlies, A.; Bullister, J. L.; Goyet, C.; Metzl, N.; Touratier, F.; Mcdonagh, E.; Bryden, H. L.
The subtropical Indian Ocean along 32° S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (CANT) from five different methods: four data-base methods (ΔC*, TrOCA, TTD and C0IPSL and a simulation from the OCCAM model are compared and discussed along with the observed CFC-12 and CCl4 distributions. In the surface layer, where carbon-based methods are uncertain, TTD and OCCAM yield the same result (7±0.2 mol C m−2), helping to specify the surface CANT inventory. Below the mixed-layer, the comparison suggests that CANT penetrates deeper and more uniformly into the Antarctic Intermediate Water layer limit than estimated from the ΔC* method....
Tipo: Text
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00293/40431/38985.pdf

Mineralization of biogenic materials in the water masses of the South Atlantic Ocean. I: assessment and results of an optimum multiparameter analysis
Provedor de dados: 5
Autores: Alvarez, M.; Brea, S.; Mercier, Herle; Alvarez-salgado, X. A.
This is the first of two manuscripts dealing with the circulation, mixing, ventilation and organic matter mineralization of the South Atlantic Ocean (SAO). The present work quantifies the complex mixing of water masses in the SAO using a constrained, least-squares regression, Optimum MultiParameter (OMP) analysis. The OMP based on temperature, salinity, silicate and the conservative parameter NO, was applied on two World Ocean Circulation (WOCE) lines, A17 and A14, in the western and eastern SAO, respectively. The constrained OMP sensitivity to sources of error in the end-member characteristics, measured parameters, equation weights and oxygen to nitrogen mineralisation ratio (RN) was carefully assessed using perturbation tests. Perturbation of RN was the...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28178/26414.pdf

New insights on the mineralization of dissolved organic matter in central, intermediate, and deep water masses of the northeast North Atlantic
Provedor de dados: 5
Autores: Alvarez-salgado, X. A.; Nieto-cid, M.; Alvarez, M.; Perez, F; Morin, P; Mercier, Herle.
An optimum multiparameter (OMP) analysis was applied to samples collected during a cruise in the northeast North Atlantic with the aim of objectively defining water mass realms and calculating water mass mixing-weighted average (archetypal) concentrations of dissolved organic carbon (DOC) and nitrogen (DON) and fluorescent dissolved organic matter (FDOM). The profile of archetypal DOC, which retains the basin-scale variability from the formation area of the water masses to the study area, was modeled with a constant initial concentration of 60 +/- 1 mu mol kg(-1) that decreased linearly with increasing apparent oxygen utilization (AOU) at a rate of -0.20 +/- 0.03 mol C per mol of AOU. The archetypal C:N ratio of dissolved organic matter was also modeled...
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00139/24979/23060.pdf

Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches
Provedor de dados: 5
Autores: Alvarez, M.; Lo Monaco, C.; Tanhua, T.; Yool, A.; Oschlies, A.; Bullister, J. L.; Goyet, C.; Metzl, N.; Touratier, F.; Mcdonagh, E.; Bryden, H. L.
The subtropical Indian Ocean along 32 degrees S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (CANT) from five different methods: four data-base methods (Delta C*, TrOCA, TTD and IPSL) and a simulation from the OCCAM model are compared and discussed along with the observed CFC-12 and CCl4 distributions. In the surface layer, where carbon-based methods are uncertain, TTD and OCCAM yield the same result (7 +/- 0.2 molC m(-2)), helping to specify the surface CANT inventory. Below the mixed-layer, the comparison suggests that CANT penetrates deeper and more uniformly into the Antarctic Intermediate Water layer limit than estimated from the much...
Tipo: Text
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00218/32916/31409.pdf

Caracterización de la temperatura superficial del mar en los sitios de visita turística de la Reserva Marina de Galápagos
Provedor de dados: 20
Autores: Ortega, J.; Jara, V.; Alvarez, M.; Rentería, W.
El presente estudio consiste en un análisis descriptivo de los parámetros físicos (temperatura-salinidad) y corrientes superficiales y sub-superficiales, obtenidos en los sitios de visita turística de la Reserva Marina de Galápagos (RMG), los cuales describen las condiciones oceanográficas de dichos lugares. Estos datos han sido procesados con el propósito de establecer una caracterización de la temperatura superficial del mar en estos sitios, y sus variaciones a lo largo del 2011. Esta caracterización será soportada con el uso de los datos del Análisis Operacional de Temperatura Superficial del Mar y de Hielo Marino (UKMO-L4HRfnd-GLOB-OSTIA) a fin de conseguir una continuidad en la serie de tiempo anual.
Tipo: Journal Contribution
Palavras-chave: Temperature; Salinity; Surface temperature; Sea ice; Marine parks; Surface currents currents.
Ano: 2012
URL: http://hdl.handle.net/1834/4658