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| Parard, Gaelle; Boutin, J.; Cuypers, Y.; Bouruet-aubertot, P.; Caniaux, G.. |
| The availability of nutrients in the mixed layer is the main limitation to organic carbon biological production in the tropical regions. In this paper, we investigate the potential role of internal waves at promoting the development of biological activity on a PIRATA mooring at 6 degrees S, 10 degrees W. This mooring is located above the Mid-Atlantic Ridge where we observe strong internal waves. Using a one-dimensional physical and biogeochemical coupled model, we simulate dissolved inorganic carbon (DIC). Providing the influence of vertical advection and turbulent diapycnal diffusivity are (it is vertical advection + turbulent dipycnal mixing) accounted for, we find that this model provides a good fit with observed in situ CO2 fugacity (fCO(2)). Main... |
| Tipo: Text |
Palavras-chave: Carbon dioxide; Internal wave; High frequency; PIRATA; Atlantic tropical; Nitrate flux. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00624/73568/73005.pdf |
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| De Boisseson, Eric; Thierry, Virginie; Mercier, Herle; Caniaux, G.. |
| The mixed layer processes that govern the mode water properties in the Iceland Basin are quantified through a mixed layer heat budget from Argo data collected over 2001-2007. This budget includes the mixed layer heat content variation, the surface heat fluxes, and the Ekman contribution to advection. The geostrophic advection cannot be directly estimated from Argo data but, following previous works, an ad hoc procedure is implemented to take it into account. The resulting annual budget is closed within the error bar but this closure hides some compensation between the summer and the winter residuals (-16 +/- 9 W m(-2) and 21 +/- 26 W m(-2), respectively). A similar heat budget built by using colocated Argo floats in the 1/4 degrees DRAKKAR ORCA025-G70fo... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00017/12807/9761.pdf |
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| Janicot, S.; Thorncroft, C. D.; Ali, A.; Asencio, N.; Berry, G.; Bock, O.; Bourles, B.; Caniaux, G.; Chauvin, F.; Deme, A.; Kergoat, L.; Lafore, J.-p.; Lavaysse, C.; Lebel, T.; Marticorena, B.; Mounier, F.; Nedelec, P.; Redelsperger, J.-l.; Ravegnani, F.; Reeves, C. E.; Roca, R.; De Rosnay, P.; Schlager, H.; Sultan, B.; Tomasini, M.; Ulanovsky, A.. |
| The AMMA (African Monsoon Multidisciplinary Analysis) program is dedicated to providing a better understanding of the West African monsoon and its influence on the physical, chemical and biological environment regionally and globally, as well as relating variability of this monsoon system to issues of health, water resources, food security and demography for West African nations. Within this framework, an intensive field campaign took place during the summer of 2006 to better document specific processes and weather systems at various key stages of this monsoon season. This campaign was embedded within a longer observation period that documented the annual cycle of surface and atmospheric conditions between 2005 and 2007. The present paper provides a large... |
| Tipo: Text |
Palavras-chave: Meteorology and atmospheric dynamics; Climatology; Precipitation; Tropical meteorology. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00203/31457/29861.pdf |
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| Bouin, Marie-noelle; Legain, D.; Traulle, O.; Belamari, S.; Caniaux, G.; Fiandrino, Annie; Lagarde, Franck; Barrie, J.; Moulin, E.; Bouhours, G.. |
| An extra large aperture scintillometer (XLAS) was used over several months across the Thau Lagoon (South of France) to retrieve one-wavelength scintillation and, thence, sensible heat flux. We present the experiment with the XLAS, an eddy-covariance station and meteorological stations measuring on or near the Thau Lagoon. Changes implemented to adapt the scintillometry processing schemes to the above water conditions are presented together with a full error budget, including sensitivity tests to the relevant parameters of the scintillometer processing scheme. The XLAS error budget amounts to 16% (systematic part) +/- 50% (random part). Sensible heat fluxes obtained using the XLAS under unstable atmospheric conditions are then compared to eddy-covariance... |
| Tipo: Text |
Palavras-chave: Air-sea fluxes; Eddy covariance; Footprint; Monin-Obukhov similarity theory; Scintillometry; Sensible heat flux. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00085/19621/17483.pdf |
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| Nogueira Neto, A., V; Giordani, H.; Caniaux, G.; Araujo, M.. |
| Oceanic and atmospheric processes were investigated in order to explore the causes of seasonal and interannual variability of sea surface temperatures (SST) in the western tropical Atlantic (WTA; 20 degrees S-20 degrees N, 15 degrees W-60 degrees W). A mixed-layer (ML) heat budget was performed by using Argo profiles and supplementary data sets based on satellite and atmospheric products during the period 2007-2012. The WTA is divided into four boxes which represent the main temporal and spatial heterogeneities of this region. An analysis of error of each term pointed out that the mean net surface heat fluxes are systematically underestimated by 20 W m(-2). A correction of this term provides realistic estimates of the vertical mixing which was obtained as... |
| Tipo: Text |
Palavras-chave: Tropical Atlantic; Mixed-layer heat budget; Sea surface temperature; Argo floats. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00623/73551/73798.pdf |
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| Piron, Anne; Thierry, Virginie; Mercier, Herle; Caniaux, G.. |
| Using Argo floats, we show that a major deep convective activity occurred simultaneously in the Labrador Sea (LAB), South of Cap Farewell (SCF) and the Irminger Sea (IRM) during winter 2014–2015. Convection was driven by exceptional heat loss to the atmosphere (up to 50% higher than the climatological mean). This is the first observation of deep convection over such a widespread area. Mixed layer depths exceptionally reached 1700 m in SCF and 1400 m in IRM. The deep thermocline density gradient limited the mixed layer deepening in the Labrador Sea to 1800 m. Potential densities of deep waters were similar in the three basins (27.73-27.74 kg m−3), but warmer by 0.3 °C and saltier by 0.04 in IRM than in LAB and SCF, meaning that each basin formed locally its... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00370/48072/48175.pdf |
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