Major changes in Mediterranean Sea level variability from 7 years of TOPEX/Poseidon and ERS-1/2 data

Larnicol, Gilles; Ayoub, Nadia; Traon, Pierre‐Yves Le

doi:10.1016/s0924-7963(02)00053-2

Cited by 120 publications

(100 citation statements)

References 35 publications

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“…10). The upwelling process may be related to the observed seasonal variability of the intensity and position of the Pelops anticyclonic gyre (Larnicol et al, 2002). The latter authors, using satellite altimetry, demonstrate that the Pelops gyre was repeatedly observed to weaken or disappear in late spring and early to mid-summer and reappear in fall.…”

Section: Seasonal Variabilitymentioning

confidence: 96%

“…During mid-late 1990s the large-scale anticyclonic circulation observed during the 1980s and early 1990s was confined to the southern part and replaced by a cyclonic circulation in the northern Ionian (Borzelli et al, 2009;Gačić et al, 2011;Larnicol et al, 2002). In the years following 2006, the salinity and nutrient changes in the south Adriatic suggest that the Ionian circulation was changed back into anticyclonic (Civitarese et al, 2010).…”

Section: Interannual Variabilitymentioning

confidence: 99%

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Downward fluxes of sinking particulate matter in the deep Ionian Sea (NESTOR site), eastern Mediterranean: seasonal and interannual variability

et al. 2013

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Abstract. In order to assess seasonal and interannual variability in the export of particulate matter and its main constituents, sediment traps were deployed at five successive depths from February 2006 to March 2010 in the deepest basin of the Mediterranean (SE Ionian Sea, NESTOR site). The average total mass fluxes were 66, 58, 54, 34, and 52 mg m −2 d −1 , at 700, 1200, 2000, 3200, and 4300 m, respectively. The temporal variations of the mass flux showed similar seasonal signal at all sampling depths with higher values in spring-summer and lower in autumn-winter. Changes in the main constituents of the mass flux (organic carbon, carbonates, opal, and lithogenic matter) largely followed the same temporal variability with total mass flux, revealing mechanisms of rapid vertical (top-down) transport from 700 m down to 4300 m depth. Lateral inputs at the deepest trap are probably of importance, attributed to the influence of the deep Adriatic water, characterized by relatively higher turbidity than overlying water masses. Two major processes seem to control the seasonal mass flux variability: (a) primary productivity at the euphotic zone; and (b) episodic dust input events. Primary productivity shows two maxima during late winter/early spring and late spring/summer, as witnessed by the organic carbon, carbonate, and opal fluxes in the mesopelagic and bathypelagic layers, whereas the influence of dust inputs is evidenced by enhanced lithogenic fluxes occurring during spring and summer. The interannual variability generally shows a gradual increase of fluxes during the time frame of the experiment. Both seasonal and interannual variability of mass flux are associated with variations in the intensity and position of the neighboring Pelops anticyclonic gyre, which appears to affect the upwelling of intermediate, nutrient-rich waters and subsequently the surface productivity. Combination of estimated satellite and algorithm-generated primary production data for the Ionian Sea, calculated POC fluxes out of the euphotic layer and POC fluxes measured by sediment traps at the mesopelagic and bathypelagic layers of NESTOR site during our 4 yr experiment, reveal that only a small portion of primary production (0.46 %) reaches at 3200 m, corresponding to a mean annual carbon export of 1.12 g C m −2 yr −1 .

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Section: Seasonal Variabilitymentioning

confidence: 96%

Section: Interannual Variabilitymentioning

confidence: 99%

Downward fluxes of sinking particulate matter in the deep Ionian Sea (NESTOR site), eastern Mediterranean: seasonal and interannual variability

et al. 2013

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“…Figures 13 and 14 present the first EOF mode of altimetry and G85 SSH respectively. The first EOF mode of altimetry, which explains 72.6% of the covariance, shows the strong seasonal variability of the Alboran Gyres with maximum amplitude in autumn (Larnicol et al 2002). Also seen is the autumn/winter intensification of the cyclonic circulation in the Gulf of Lions.…”

Section: Eof Analysis Of Sshmentioning

confidence: 95%

Multiparametric analysis and validation in the western Mediterranean of three global OGCM hindcasts

Vidal-Vijande¹,

Pascual²,

Barnier³

et al. 2012

Sci. Mar.

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SUMMARY:We analyse a hierarchy of three 1/4° global numerical simulations (ORCA-025.G70 (G70), ORCA-025. G85 (G85) and GLORYS1V1 (GLORYS)) by assessing their performance against observational data in the western Mediterranean. When compared with the EN3_v2a temperature and salinity database, the simulations are capable of reproducing surface layer temperature interannual variability but G70 is inaccurate with intermediate and deep-layer trends. This aspect is improved by the increased vertical resolution of G85 and by data assimilation in GLORYS. Salinity is the most problematic parameter because of the imbalance of the freshwater budget derived from inaccuracies in the atmospheric forcing parameters. Surface salinity restoring is needed in order to avoid salinity drift and inaccurate sea-level trends. G70, with a stronger relaxation, has a lower trend closer to altimetric measurements than G85. Mean surface circulation is well reproduced for relatively large-scale signals. We further show that G85 and GLORYS provide evidence of the 2004-2005 and 2005-2006 deep convection events in the Gulf of Lion. Finally, transports through the main straits of the western Mediterranean are correct in order of magnitude, direction and seasonal cycle when compared with observations. This study contributes to the improvement of the ORCA hierarchy of simulations and points out the strengths and weaknesses of these simulations in the Mediterranean Sea.

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“…The SLA and CHL variability in the Mediterranean are dominated by the seasonal cycle (Larnicol et al, 2002;Bosc et al, 2004). As a first step, it is necessary to remove these seasonal variations because otherwise they would dominate the resultant correlations.…”

Section: Seasonal Cycles and Inter-and Intra-annual Anomaliesmentioning

confidence: 99%

“…Complementarily, altimetry satellite data shows that the sea level variability in the Mediterranean is a complex combination of a wide range of spatial and temporal scales (Cazenave et al, 2001;Larnicol et al, 2002). Besides the marked seasonal cycle in SLA caused by the steric effect, important intra-and inter-annual signals are observed associated with permanent or transitory oceanographic structures such as frontal currents and mesoscale eddies (Jordi & Wang, 2009;Pujol & Larnicol, 2005).…”

mentioning

confidence: 99%

Using SVD Analysis of Combined Altimetry and Ocean Color Satellite Data for Assessing Basin Scale Physical-Biological Coupling in the Mediterranean Sea

Jordi¹,

Basterretxea²

2012

Remote Sensing of Biomass - Principles and Applications

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Major changes in Mediterranean Sea level variability from 7 years of TOPEX/Poseidon and ERS-1/2 data

Cited by 120 publications

References 35 publications

Downward fluxes of sinking particulate matter in the deep Ionian Sea (NESTOR site), eastern Mediterranean: seasonal and interannual variability

Downward fluxes of sinking particulate matter in the deep Ionian Sea (NESTOR site), eastern Mediterranean: seasonal and interannual variability

Multiparametric analysis and validation in the western Mediterranean of three global OGCM hindcasts

Using SVD Analysis of Combined Altimetry and Ocean Color Satellite Data for Assessing Basin Scale Physical-Biological Coupling in the Mediterranean Sea

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