Algal blooming patterns and anomalies in the Mediterranean Sea as derived from the SeaWiFS data set (1998–2003)

2008 ◽  
Vol 112 (8) ◽  
pp. 3300-3313 ◽  
Author(s):  
Vittorio Barale ◽  
Jean-Michel Jaquet ◽  
Mapathé Ndiaye
Keyword(s):  
Mediterranean Sea ◽  
Data Set ◽  
The Mediterranean

scholarly journals Characterization of turbulence and validation of fine-scale parametrization in the Mediterranean Sea during BOUM experiment

2011 ◽  
Vol 8 (5) ◽  
pp. 8961-8998 ◽  
Author(s):  
Y. Cuypers ◽  
P. Bouruet-Aubertot ◽  
C. Marec ◽  
J.-L. Fuda
Keyword(s):  
Energy Dissipation ◽  
Mediterranean Sea ◽  
Fine Scale ◽  
Data Set ◽  
Mean Values ◽  
The Mediterranean ◽  
Microstructure Measurements ◽  
High Level ◽  
Anticyclonic Eddies

Abstract. One main purpose of BOUM experiment was to give evidence of the possible impact of submesoscale dynamics on biogeochemical cycles. To this aim physical as well as biogeochemical data were collected along a zonal transect through the western and eastern basins. Along this transect 3 day fixed point stations were performed within anticyclonic eddies during which microstructure measurements were collected over the first 100 m. We focus here on the characterization of turbulent mixing induced by internal wave breaking. The analysis of microstructure measurements revealed a high level of turbulence in the seasonal pycnocline and a moderate level below with energy dissipation mean values of the order of 10−6 W kg−1 and 10−8 W kg−1, respectively. Fine-scale parameterizations developed to mimic energy dissipation produced by internal wavebreaking were then tested against these direct measurements. Once validated a parameterization has been applied to infer energy dissipation and mixing over the whole data set, thus providing an overview over a latitudinal section of the Mediterranean sea. The results evidence a significant increase of dissipation at the top and base of eddies associated with strong near inertial waves. Vertical turbulent diffusivity is increased both in these regions and in the weakly stratified eddy core.

Statistical analysis of model wind data for the Mediterranean Sea 

2021 ◽  
Author(s):  
Mahmud Hasan Ghani ◽  
Nadia Pinardi ◽  
Francesco Trotta
Keyword(s):  
Probability Distribution ◽  
Weibull Distribution ◽  
Mediterranean Sea ◽  
Initial Conditions ◽  
Surface Wind ◽  
Wind Data ◽  
Parameter Distribution ◽  
Forecast Errors ◽  
Data Set ◽  
The Mediterranean

<p>The focus of this study is to analyze the probability distribution functions of model wind data over the Mediterranean Sea. The atmospheric wind data set is composed by ECWMF analyses for the period 2010-2019. A single grid point statistical method is applied to the Mediterranean Sea for both wind components and amplitude. The pdf (probability distribution function) of the wind components is Gaussian while the amplitude is Weibull. In addition, sensitivity experiments are done to compare the Weibull with the Exponential Weibull pdfs, showing almost identical patterns for both distributions. The use of two parameters Weibull distribution is widely accepted to represent the statistical structure of surface wind, while three parameters Exponential Weibull distribution mostly refers to extreme events. The pdf parameter distribution in the Mediterranean Sea is shown for the first time to be associated with specific wind structures such as Mistral and Etesian winds. This study confirms the previous results from Chu (2009) for oceanic currents and by Drobinski (2015) for wind station data, both cases showing the two parameter Gaussian pdf for wind components and Weibull pdf for wind amplitude. The knowledge of these distributions will help to improve the ensemble ocean forecast as for the setting of initial conditions of ocean forecasts where atmospheric forcing is crucial to quantify the forecast errors.</p>

scholarly journals Repeat hydrography in the Mediterranean Sea, data from the <i>Meteor</i> cruise 84/3 in 2011

2013 ◽  
Vol 5 (2) ◽  
pp. 289-294 ◽  
Author(s):  
T. Tanhua ◽  
D. Hainbucher ◽  
V. Cardin ◽  
M. Álvarez ◽  
G. Civitarese ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Data Sets ◽  
Data Set ◽  
Biological Variables ◽  
German Research ◽  
Relevant Variables ◽  
Historic Data ◽  
Repeat Hydrography ◽  
The Mediterranean ◽  
Guide Lines

Abstract. Here we report on data from an oceanographic cruise on the German research vessel Meteor covering large parts of the Mediterranean Sea during spring of 2011. The main objective of this cruise was to conduct measurements of physical, chemical and biological variables on a section across the Mediterranean Sea with the goal of producing a synoptic picture of the distribution of relevant physical and biogeochemical properties, in order to compare those to historic data sets. During the cruise, a comprehensive data set of relevant variables following the guide lines for repeat hydrography outlined by the GO-SHIP group (http://www.go-ship.org/) was collected. The measurements include salinity and temperature (CTD), an over-determined carbonate system, inorganic nutrients, oxygen, transient tracers (CFC-12, SF6), helium isotopes and tritium, and carbon isotopes. The cruise sampled all major basins of the Mediterranean Sea following roughly an east-to-west section from the coast of Lebanon through to the Strait of Gibraltar, and to the coast of Portugal. Also a south-to-north section from the Ionian Sea to the Adriatic Sea was carried out. Additionally, sampling in the Aegean, Adriatic and Tyrrhenian Seas were carried out. The sections roughly followed lines and positions that have been sampled previously during other programs, thus providing the opportunity for comparative investigations of the temporal development of various parameters.

scholarly journals Inferring particle dynamics in the Mediterranean Sea from in-situ pump POC and chloropigment data using Bayesian statistics

2018 ◽  
Author(s):  
Weilei Wang ◽  
Cindy Lee ◽  
Francois Primeau
Keyword(s):  
Mediterranean Sea ◽  
Rate Constants ◽  
Particle Aggregation ◽  
Inversion Method ◽  
Particle Dynamic ◽  
Concentration Data ◽  
Data Set ◽  
Aggregation And Disaggregation ◽  
The Mediterranean

Abstract. Chloropigment and particulate organic carbon (POC) concentration data collected using in-situ large-volume pumps during the MedFlux project in the Mediterranean Sea in May 2005 provided an opportunity to estimate rate constants that control the fate of particles and specifically chloropigments in the water column. Additionally, comparisons to thorium and chloropigment data from settling-velocity (SV) sediment traps at the same site enabled us to distinguish between the influence of the sampling method used vs. the tracer used on particle dynamic rate constants. Here we introduce a Bayesian statistical inversion method that combines the data with a new box model and has the capacity to infer rate constants for POC respiration/dissolution, chlorophyll and phaeopigment degradation, and particle aggregation and disaggregation. The estimated small-particle (1–70 μm) POC respiration rate constant was 1.25+0.55−0.38 yr−1 (0.80 yr). For this data set, the rate constants for chlorophyll (Chl) degradation to phaeopigments and phaeopigment respiration were not well constrained. The estimated aggregation and disaggregation rate constants were 7.65+3.35−2.33 (0.13 yr) and 106.09+39.13−28.59 yr−1 (0.01 yr), respectively, which indicates that particle aggregation and disaggregation were extensive at the studied depths (125–750 m) in May after the spring bloom had ended and flux was low.

scholarly journals Latitudinal, longitudinal and bathymetric patterns of abundance, biomass of metazoan meiofauna: importance of the rare taxa and anomalies in the deep Mediterranean Sea

2010 ◽  
Vol 1 (1) ◽  
pp. 167 ◽  
Author(s):  
Cristina Gambi ◽  
Nikolaos Lampadariou ◽  
Roberto Danovaro
Keyword(s):  
Mediterranean Sea ◽  
Food Sources ◽  
Negative Slope ◽  
Deep Basin ◽  
Western Basin ◽  
Data Set ◽  
Rare Taxa ◽  
Longitudinal Gradients ◽  
The Mediterranean ◽  
Meiofaunal Abundance

Quantitative information on the spatial distribution of meiofaunal abundance, biomass and biodiversity (as richness of higher taxa) is summarised from 476 sites of the deep- Mediterranean Sea, at depths ranging from ca. 200 to 4617 m. Meiofaunal abundance (46531 and 30624 ind 10 cm2 at 200–1000 and 1000–2000m depth intervals) and biomass (12516 and 11920 mgC 10 cm2 at 200–1000 and 1000–2000m depth intervals) in the bathyal sediments of the Mediterranean Sea are similar to those reported in oceans worldwide but at much higher depths (abyssal or hadal). Meiofaunal abundance, biomass and richness of taxa displayed a common decreasing bathymetric pattern, but showed a steeper negative slope than in other oceanic regions. Latitudinal and longitudinal gradients revealed idiosyncratic patterns when different basins (Western, Central and Eastern) and habitats (open slope, canyon, deep basin and trench) were considered. The results of the non parametric multivariate multiple regression analyses revealed that, conversely to what expected, depth is not the key factor in explaining the variance of meiofaunal assemblages living down to 2000m depth. The quality and quantity of food sources explained a larger fraction of the variance of meiofaunal variables (47, 25 and 33% for abundance, biomass and diversity, respectively) and the importance of food sources increased with increasing depth. However, most of the variance remains unexplained suggesting that other factors (such as episodic events, deep currents, other unexplored yet environmental characteristics) can act a key role in driving the observed meiofaunal spatial patterns. The analysis of rare taxa (on a data set of 183 samples), suggested that differences in the meiofaunal community were evident when dominating taxa (nematodes, copepods and polychaetes) were excluded. We report the presence of rare taxa exclusively present in open slope (amphipods) and canyon (cnidarians and decapod larvae) systems, whereas others are exclusively found in one of the two basins (e.g. gastrotrichs in the Western basin and amphipods and gastropods in the Eastern basin). The apparent preference of some rare taxa for a specific habitat or basin could have important implications for the identification of the hot spots of benthic diversity, for identifying the connectivity among systems and for an appropriate management of deep-sea habitats in the Mediterranean Sea.

scholarly journals Repeat hydrography in the Mediterranean Sea, data from the <i>Meteor</i> cruise 84/3 in 2011

2013 ◽  
Vol 6 (1) ◽  
pp. 59-71 ◽  
Author(s):  
T. Tanhua ◽  
D. Hainbucher ◽  
V. Cardin ◽  
M. Álvarez ◽  
G. Civitarese
Keyword(s):  
Mediterranean Sea ◽  
Data Sets ◽  
Data Set ◽  
Biological Variables ◽  
German Research ◽  
Relevant Variables ◽  
Historic Data ◽  
Repeat Hydrography ◽  
The Mediterranean ◽  
Guide Lines

Abstract. Here we report on data from an oceanographic cruise on the German research vessel Meteor covering large parts of the Mediterranean Sea during spring of 2011. The main objectives of this cruise was to conduct measurements of physical, chemical and biological variables on a section across the Mediterranean Sea with the goal of producing a synoptic picture of the distribution of relevant physical and biogeochemical properties, in order to compare those to historic data sets. During the cruise, a comprehensive data set of relevant variables following the guide lines for repeat hydrography outlined by the GO-SHIP group (http://www.go-ship.org/) was collected. The measurements include; salinity and temperature (CTD), an over-determined carbonate system, inorganic nutrients, oxygen, transient tracers (CFC-12, SF6), Helium isotopes and tritium, and carbon isotopes. The cruise sampled all major basins of the Mediterranean Sea following roughly an east-to-west section from the coast of Lebanon to through the Strait of Gibraltar, and to the coast of Portugal. Also a south-to-north section from the Ionian Sea to the Adriatic Sea was carried out. Additionally, sampling in the Aegean, Adriatic and Tyrrhenian Seas were carried out. The sections roughly followed lines and positions that have been sampled previously during other programs, thus providing the opportunity for comparative investigations of the temporal development of various parameters.

scholarly journals PALAEOCLIMATIC AND PALAEOCEANOGRAPHIC EVOLUTION OF THE MEDITERRANEAN SEA OVER THE LAST 18KA

2017 ◽  
Vol 43 (2) ◽  
pp. 1064
Author(s):  
K. Thomopoulos ◽  
M. Geraga ◽  
E. Fakiris ◽  
G. Papatheodorou ◽  
G. Ferentinos
Keyword(s):  
Mediterranean Sea ◽  
Marine Sediments ◽  
Mediterranean Region ◽  
Planktonic Foraminifera ◽  
Sampling Interval ◽  
Time Interval ◽  
Time Sampling ◽  
Data Set ◽  
The Mediterranean ◽  
Planktonic Species

he aim of the present study is the reconstruction of the palaeoclimatic and palaeoceanographic evaluation of the Mediterranean Sea over the last 18ka based on the distribution of the planktonic foraminifera species. Planktonic foraminifera species have been proven excellent indicators of the palaeoclimatic and palaeoceanographic variability. The data set of the present study consists of the variability in the abundances of planktonic foraminifera species as has been reported and published in previous studies, after the examination of marine sediments from cores selected all over the Mediterranean Sea. The evolution in the abundance of each planktonic species is examined on a time interval spacing of 1000years suggesting implications for the palaeoclimatic and palaeoceanographic evolution of the Mediterranean Sea for the same time sampling interval (1000yrs). The most pronounced results of this study suggest that: (i) the increase in surface temperature during the warm intervals always follow a decreasing trend from eastern to western areas, (ii) the eutrophication of the Mediterranean Sea in most of the time exhibits a decreasing trend from northern to southern areas, and (iii) during the Holocene two cool spells (at around 8ka and 4ka) seems that had affected the majority of the Mediterranean region.

scholarly journals Using SeaDataNet management system to preserve the XBT data-set of the Mediterranean Sea

2015 ◽  
Author(s):  
Leda Pecci ◽  
Tiziana Ciuffardi ◽  
Franco Reseghetti ◽  
Paola Picco ◽  
Michele Fichaut ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Management System ◽  
Data Set ◽  
The Mediterranean

scholarly journals Multivariate Empirical Orthogonal Function analysis of the upper thermocline structure of the Mediterranean Sea from observations and model simulations

2003 ◽  
Vol 21 (1) ◽  
pp. 167-187 ◽  
Author(s):  
S. Sparnocchia ◽  
N. Pinardi ◽  
E. Demirov
Keyword(s):  
Mediterranean Sea ◽  
Large Scale ◽  
Vertical Structure ◽  
Model Simulation ◽  
Function Analysis ◽  
Original Data ◽  
Empirical Orthogonal Functions ◽  
Data Set ◽  
Model Simulations ◽  
The Mediterranean

Abstract. Multivariate vertical Empirical Orthogonal Functions (EOF) are calculated for the entire Mediterranean Sea both from observations and model simulations, in order to find the optimal number of vertical modes to represent the upper thermocline vertical structure. For the first time, we show that the large-scale Mediterranean thermohaline vertical structure can be represented by a limited number of vertical multivariate EOFs, and that the "optimal set" can be selected on the basis of general principles. In particular, the EOFs are calculated for the combined temperature and salinity statistics, dividing the Mediterranean Sea into 9 regions and grouping the data seasonally. The criterion used to establish whether a reduced set of EOFs is optimal is based on the analysis of the root mean square residual error between the original data and the profiles reconstructed by the reduced set of EOFs. It was found that the number of EOFs needed to capture the variability contained in the original data changes with geographical region and seasons. In particular, winter data require a smaller number of modes (4–8, depending on the region) than the other seasons (8–9 in summer). Moreover, western Mediterranean regions require more modes than the eastern Mediterranean ones, but this result may depend on the data scarcity in the latter regions. The EOFs computed from the in situ data set are compared to those calculated using data obtained from a model simulation. The main results of this exercise are that the two groups of modes are not strictly comparable but their ability to reproduce observations is the same. Thus, they may be thought of as equivalent sets of basis functions, upon which to project the thermohaline variability of the basin. Key words. Oceanography: general (water masses) – Oceanography: physical (hydrography; instruments and techniques)

scholarly journals Computation of a new mean dynamic topography for the Mediterranean Sea from model outputs, altimeter measurements and oceanographic in situ data

Ocean Science ◽  
2014 ◽  
Vol 10 (4) ◽  
pp. 731-744 ◽  
Author(s):  
M.-H. Rio ◽  
A. Pascual ◽  
P.-M. Poulain ◽  
M. Menna ◽  
B. Barceló ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
External Validation ◽  
Data Sets ◽  
Dynamic Topography ◽  
Data Set ◽  
Mean Dynamic Topography ◽  
In Situ Data ◽  
Velocity Variance ◽  
Sensitivity Studies ◽  
The Mediterranean

Abstract. The accurate knowledge of the ocean's mean dynamic topography (MDT) is a crucial issue for a number of oceanographic applications and, in some areas of the Mediterranean Sea, important limitations have been found pointing to the need of an upgrade. We present a new MDT that was computed for the Mediterranean Sea. It profits from improvements made possible by the use of extended data sets and refined processing. The updated data set spans the 1993–2012 period and consists of drifter velocities, altimetry data, hydrological profiles and model data. The methodology is similar to the previous MDT by Rio et al. (2007). However, in Rio et al. (2007) no hydrological profiles had been taken into account. This required the development of dedicated processing. A number of sensitivity studies have been carried out to obtain the most accurate MDT as possible. The main results from these sensitivity studies are the following: moderate impact to the choice of correlation scales but almost negligible sensitivity to the choice of the first guess (model solution). A systematic external validation to independent data has been made to evaluate the performance of the new MDT. Compared to previous versions, SMDT-MED-2014 (Synthetic Mean Dynamic Topography of the MEDiterranean sea) features shorter-scale structures, which results in an altimeter velocity variance closer to the observed velocity variance and, at the same time, gives better Taylor skills.

Sign in / Sign up

Export Citation Format

Share Document