Primary production, carbon export and nutrients availability in western and eastern Mediterranean Sea in early summer 1996 (MINOS cruise)

Moutin, Thierry; Raimbault, Patrick

doi:10.1016/s0924-7963(02)00062-3

Cited by 285 publications

(252 citation statements)

References 35 publications

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“…These water depths roughly correspond to the depths of the euphotic zone (83 m for A, and 102 m for C) and are slightly deeper than the top of the nitricline which were observed at 72, and 93 m, respectively . These results are in good agreement with previous 3300 H. Loisel et al: Bio-optical anomaly and diurnal variability studies performed in oligotrophic areas (Moutin and Raimbault, 2002;Marty et al, 2002;Letelier et al, 2004;Uitz et al, 2006). The TChl-a values at the DCM are 0.49 and 0.46 mg m −3 which, compared to their surface values, correspond to an increase in TChl-a with depth by a factor of 10.5 and 14, respectively.…”

Section: Production Modelsupporting

confidence: 91%

Characterization of the bio-optical anomaly and diurnal variability of particulate matter, as seen from scattering and backscattering coefficients, in ultra-oligotrophic eddies of the Mediterranean Sea

et al. 2011

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Abstract. The variability of inherent optical properties is investigated in the ultra-oligotrophic waters of the Mediterranean Sea sampled during the BOUM experiment performed during early summer 2008. Bio-optical relationships found for ultra-oligotrophic waters of the three anticyclonic gyres sampled significantly depart from the mean standard relationships provided for the global ocean, confirming the peculiar character of these Mediterranean waters. These optical anomalies are diversely related to the specific biological and environmental conditions occurring in the studied ecosystem. Specifically, the surface specific phytoplankton absorption coefficient exhibits values lower than those expected from the general relationships mainly in relation with a high contribution of relatively large sized phytoplankton. Conversely, the particulate backscattering coefficient, b bp , values are much higher than the mean standard values for a given chlorophyll-a concentration, TChl-a. This feature can presumably be related to the relevant influence of highly refractive submicrometer particles of Saharan origin in the surface layer of the water column. The present measurements Correspondence to: H. Loisel (hubert.loisel@univ-littoral.fr) also show that the Mediterranean Sea is greener than TChla alone indicates, as already stressed in previous studies. This color anomaly is partly explained by the estimated colored dissolved organic matter and submicrometer particles absorption coefficients, and to a greater extent by the high b bp /TChl-a values assuming that these particles backscatter light similarly in the green and blue parts of the visible spectrum. The diel variation of both the particulate matter attenuation and backscattering coefficients were also investigated specifically. Despite some differences in the timing and the magnitude of the daily oscillations found for these optical parameters, potential for the backscattering coefficient daily oscillation to be used, similarly to that for the attenuation coefficient, as a proxy for estimating carbon community production budget has been highlighted for the first time. This result is particularly relevant for present and future geostationary spatial ocean color missions.

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Section: Production Modelsupporting

confidence: 91%

Characterization of the bio-optical anomaly and diurnal variability of particulate matter, as seen from scattering and backscattering coefficients, in ultra-oligotrophic eddies of the Mediterranean Sea

et al. 2011

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“…Notably, phosphate concentrations in North Atlantic surface waters are in the nanomolar range-as are those in the Mediterranean Sea-and at least an order of magnitude lower than surface levels in the North Pacific (Wu et al, 2000;Moutin and Raimbault, 2002). In fact, at BATS, phage pstS occurs at signature core gene frequencies (that is, it is likely present in all cyanomyoviruses), and it is nearly so at MedDCM, indicating that it has been incorporated into the genomes of essentially all cyanomyoviruses in these environments.…”

Section: Features Of Phosphate-acquisition Genes In Cultured and Wildmentioning

confidence: 99%

Genetic diversity in cultured and wild marine cyanomyoviruses reveals phosphorus stress as a strong selective agent

et al. 2013

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Viruses that infect marine cyanobacteria-cyanophages-often carry genes with orthologs in their cyanobacterial hosts, and the frequency of these genes can vary with habitat. To explore habitatinfluenced genomic diversity more deeply, we used the genomes of 28 cultured cyanomyoviruses as references to identify phage genes in three ocean habitats. Only about 6-11% of genes were consistently observed in the wild, revealing high gene-content variability in these populations. Numerous shared phage/host genes differed in relative frequency between environments, including genes related to phosphorous acquisition, photorespiration, photosynthesis and the pentose phosphate pathway, possibly reflecting environmental selection for these genes in cyanomyovirus genomes. The strongest emergent signal was related to phosphorous availability; a higher fraction of genomes from relatively low-phosphorus environments-the Sargasso and Mediterranean Sea-contained host-like phosphorus assimilation genes compared with those from the N. Pacific Gyre. These genes are known to be upregulated when the host is phosphorous starved, a response mediated by pho box motifs in phage genomes that bind a host regulatory protein. Eleven cyanomyoviruses have predicted pho boxes upstream of the phosphate-acquisition genes pstS and phoA; eight of these have a conserved cyanophage-specific gene (PhCOG173) between the pho box and pstS. PhCOG173 is also found upstream of other shared phage/host genes, suggesting a unique regulatory role. Pho boxes are found upstream of high light-inducible (hli) genes in cyanomyoviruses, suggesting that this motif may have a broader role than regulating phosphorous-stress responses in infected hosts or that these hlis are involved in the phosphorous-stress response.

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“…Overall, the western basin has a lower surface C T content than the eastern basin, which could be explained by the eastward decrease of the Mediterranean Sea trophic gradient (Lazzari et al, 2012). The higher rate of inorganic carbon consumption by photosynthesis in the western basin can lead to the depletion of C T in the surface waters, whereas the ultra-oligotrophic state in the eastern basin can lead to a high remineralization rate that consumes oxygen and enriches surface waters with C T (Moutin and Raimbault, 2002).…”

Section: Spatial and Seasonal Variability Of A T And C T In Surface Wmentioning

confidence: 99%

Climatological variations of total alkalinity and total dissolved inorganic carbon in the Mediterranean Sea surface waters

et al. 2015

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Abstract. A compilation of data from several cruises between 1998 and 2013 was used to derive polynomial fits that estimate total alkalinity (A T ) and total dissolved inorganic carbon (C T ) from measurements of salinity and temperature in the Mediterranean Sea surface waters. The optimal equations were chosen based on the 10-fold cross-validation results and revealed that second-and third-order polynomials fit the A T and C T data respectively. The A T surface fit yielded a root mean square error (RMSE) of ± 10.6 µmol kg −1 , and salinity and temperature contribute to 96 % of the variability. Furthermore, we present the first annual mean C T parameterization for the Mediterranean Sea surface waters with a RMSE of ± 14.3 µmol kg −1 . Excluding the marginal seas of the Adriatic and the Aegean, these equations can be used to estimate A T and C T in case of the lack of measurements. The identified empirical equations were applied on the 0.25 • climatologies of temperature and salinity, available from the World Ocean Atlas 2013. The 7-year averages (2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012) showed that A T and C T have similar patterns with an increasing eastward gradient. The variability is influenced by the inflow of cold Atlantic waters through the Strait of Gibraltar and by the oligotrophic and thermohaline gradient that characterize the Mediterranean Sea. The summer-winter seasonality was also mapped and showed different patterns for A T and C T . During the winter, the A T and C T concentrations were higher in the western than in the eastern basin. The opposite was observed in the summer where the eastern basin was marked by higher A T and C T concentrations than in winter. The strong evaporation that takes place in this season along with the ultra-oligotrophy of the eastern basin determines the increase of both A T and C T concentrations.

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Primary production, carbon export and nutrients availability in western and eastern Mediterranean Sea in early summer 1996 (MINOS cruise)

Cited by 285 publications

References 35 publications

Characterization of the bio-optical anomaly and diurnal variability of particulate matter, as seen from scattering and backscattering coefficients, in ultra-oligotrophic eddies of the Mediterranean Sea

Characterization of the bio-optical anomaly and diurnal variability of particulate matter, as seen from scattering and backscattering coefficients, in ultra-oligotrophic eddies of the Mediterranean Sea

Genetic diversity in cultured and wild marine cyanomyoviruses reveals phosphorus stress as a strong selective agent

Climatological variations of total alkalinity and total dissolved inorganic carbon in the Mediterranean Sea surface waters

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