scholarly journals Forecast of Sea Surface Acidification in the Northwestern Mediterranean Sea

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
P. Geri ◽  
S. El Yacoubi ◽  
C. Goyet
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Water Surface ◽  
Sea Water ◽  
Total Alkalinity ◽  
Observation Data ◽  
Monthly Data ◽  
Northwestern Mediterranean Sea ◽  
The Mean ◽  
Northwestern Mediterranean

Observation data from DYFAMED site, in northwestern Mediterranean Sea between 1995 and 2011, are used to study mathematical forecasts of sea water surface pH evolution over the next century. In a preliminary study, daily and monthly data have been used to compute total inorganic carbon (CT) and total alkalinity (AT) concentrations. Due to the arbitrary number of missing monthly observations from 1995 to 2011, mean pH values have been calculated from the available data in order to obtain a convenient monthly time series. Based on these results, we used in this paper a cubic spline method for interpolation within the range of known time series and then tested two extrapolation methods: linear and exponential smoothing. A 100-year simulated period is performed in order to have information beyond seasonal variations and observations. The mean seasonal variation allows us to draw forecast evolutions from 0.3 to 0.4 pH units decrease in the water surface at the end of the century. Although these simple forecasts do not pretend to present realistic predictions, these obtained theoretical results provide limits on pH variations in the northwestern Mediterranean Sea similar to those in the open ocean.

scholarly journals Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea

Ocean Science ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 411-426 ◽  
Author(s):  
Lydia Kapsenberg ◽  
Samir Alliouane ◽  
Frédéric Gazeau ◽  
Laure Mousseau ◽  
Jean-Pierre Gattuso
Keyword(s):  
Time Series ◽  
Ocean Acidification ◽  
Mediterranean Sea ◽  
Temporal Resolution ◽  
Total Alkalinity ◽  
Carbonate Chemistry ◽  
Deconvolution Analysis ◽  
Northwestern Mediterranean Sea ◽  
Coastal Acidification ◽  
Northwestern Mediterranean

Abstract. Coastal time series of ocean carbonate chemistry are critical for understanding how global anthropogenic change manifests in near-shore ecosystems. Yet, they are few and have low temporal resolution. At the time series station Point B in the northwestern Mediterranean Sea, seawater was sampled weekly from 2007 through 2015, at 1 and 50 m, and analyzed for total dissolved inorganic carbon (CT) and total alkalinity (AT). Parameters of the carbonate system such as pH (pHT, total hydrogen ion scale) were calculated and a deconvolution analysis was performed to identify drivers of change. The rate of surface ocean acidification was −0.0028 ± 0.0003 units pHT yr−1. This rate is larger than previously identified open-ocean trends due to rapid warming that occurred over the study period (0.072 ± 0.022 °C yr−1). The total pHT change over the study period was of similar magnitude as the diel pHT variability at this site. The acidification trend can be attributed to atmospheric carbon dioxide (CO2) forcing (59 %, 2.08 ± 0.01 ppm CO2 yr−1) and warming (41 %). Similar trends were observed at 50 m but rates were generally slower. At 1 m depth, the increase in atmospheric CO2 accounted for approximately 40 % of the observed increase in CT (2.97 ± 0.20 µmol kg−1 yr−1). The remaining increase in CT may have been driven by the same unidentified process that caused an increase in AT (2.08 ± 0.19 µmol kg−1 yr−1). Based on the analysis of monthly trends, synchronous increases in CT and AT were fastest in the spring–summer transition. The driving process of the interannual increase in AT has a seasonal and shallow component, which may indicate riverine or groundwater influence. This study exemplifies the importance of understanding changes in coastal carbonate chemistry through the lens of biogeochemical cycling at the land–sea interface. This is the first coastal acidification time series providing multiyear data at high temporal resolution. The data confirm rapid warming in the Mediterranean Sea and demonstrate coastal acidification with a synchronous increase in total alkalinity.

scholarly journals Temporal variability of vertical export flux at the DYFAMED time-series station (Northwestern Mediterranean Sea)

2013 ◽  
Vol 119 ◽  
pp. 59-67 ◽  
Author(s):  
Lars-Eric Heimbürger ◽  
Héloïse Lavigne ◽  
Christophe Migon ◽  
Fabrizio D’Ortenzio ◽  
Claude Estournel ◽  
...  
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Temporal Variability ◽  
Export Flux ◽  
Northwestern Mediterranean Sea ◽  
Vertical Export ◽  
Northwestern Mediterranean

scholarly journals Simulation and analysis of the mesoscale circulation in the northwestern Mediterranean Sea

2003 ◽  
Vol 21 (1) ◽  
pp. 281-297 ◽  
Author(s):  
V. Echevin ◽  
M. Crépon ◽  
L. Mortier
Keyword(s):  
Mediterranean Sea ◽  
General Circulation ◽  
Large Scale ◽  
Cyclonic Circulation ◽  
Mesoscale Circulation ◽  
Gulf Of Lions ◽  
Northwestern Mediterranean Sea ◽  
The Mean ◽  
Northwestern Mediterranean ◽  
Good Agreement

Abstract. The large-scale and mesoscale circulation of the northwestern Mediterranean Sea are simulated with an eddy-resolving primitive-equation regional model (RM) of 1/16° resolution embedded in a general circulation model (GM) of the Mediterranean Sea of 1/8° resolution. The RM is forced by a monthly climatology of heat fluxes, precipitation and wind stress. The GM, which uses the same atmospheric forcing, provides initial and boundary conditions for the RM. Analysis of the RM results shows that several realistic features of the large-scale and mesoscale circulation are evident in this region. The mean cyclonic circulation is in good agreement with observations. Mesoscale variability is intense along the coasts of Sardinia and Corsica, in the Gulf of Lions and in the Catalan Sea. The length scales of the Northern Current meanders along the Provence coast and in the Gulf of Lions’ shelf are in good agreement with observations. Winter Intermediate Water is formed along most of the north-coast shelves, between the Gulf of Genoa and Cape Creus. Advection of this water by the mean cyclonic circulation generates a complex eddy field in the Catalan Sea. Intense anticyclonic eddies are generated northeast of the Balearic Islands. These results are in good agreement with mesoscale activity inferred from satellite altimetric data. This work demonstrates the feasibility of a down-scaling system composed of a general-circulation, a regional and a coastal model, which is one of the goals of the Mediterranean Forecasting System Pilot Project. Key words. Oceanography: physical (currents; eddies and mesoscale processes; general circulation)

Dynamics of particle flux and carbon export in the northwestern Mediterranean Sea: A two decade time-series study at the DYFAMED site

2011 ◽  
Vol 91 (4) ◽  
pp. 461-481 ◽  
Author(s):  
Juan-Carlos Miquel ◽  
Jacobo Martín ◽  
Beat Gasser ◽  
Alessia Rodriguez-y-Baena ◽  
Tarik Toubal ◽  
...  
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Particle Flux ◽  
Carbon Export ◽  
Time Series Study ◽  
Northwestern Mediterranean Sea ◽  
Series Study ◽  
Northwestern Mediterranean

scholarly journals Temporal variability of nutrient concentrations in the northwestern Mediterranean sea (DYFAMED time-series station)

2015 ◽  
Vol 100 ◽  
pp. 1-12 ◽  
Author(s):  
Orens Pasqueron de Fommervault ◽  
Christophe Migon ◽  
Fabrizio D׳Ortenzio ◽  
Maurizio Ribera d'Alcalà ◽  
Laurent Coppola
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Temporal Variability ◽  
Nutrient Concentrations ◽  
Northwestern Mediterranean Sea ◽  
Northwestern Mediterranean

scholarly journals Spatio-temporal variability of micro-, nano- and pico-phytoplankton in the Mediterranean Sea from satellite ocean colour data of SeaWiFS

2015 ◽  
Vol 12 (1) ◽  
pp. 161-201 ◽  
Author(s):  
M. Sammartino ◽  
A. Di Cicco ◽  
S. Marullo ◽  
R. Santoleri
Keyword(s):  
Time Series ◽  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Chlorophyll A ◽  
Spring Bloom ◽  
The Other ◽  
Northwestern Mediterranean Sea ◽  
Phytoplankton Size ◽  
The Mediterranean ◽  
Northwestern Mediterranean

Abstract. The seasonal and year-to-year variability of the spatial distribution of the Phytoplankton Size Classes (PSCs) has been examined in the Mediterranean Sea using the entire time series of Sea-viewing Wide Field-of-view Sensor (SeaWiFS) space observations (1998 to 2010). PSCs daily maps have been determined using an empirical model based on a synoptic relationship between surface chlorophyll a and diagnostic pigments referred to different taxonomic groups. The validation of model PSCs estimates using a Mediterranean HPLC pigments dataset revealed that the model is able to correctly detect the contribution of pico-, nano- and micro-phytoplankton to TChl a. The analysis of micro-, nano- and pico-phytoplankton satellite time series (1998–2010) describes quantitatively the seasonal and inter-annual variability of the spatial distribution of the algal assemblage structure over the basin. The analysis reveals that in most of the Mediterranean Sea the main contribution to the chlorophyll a all around the year comes from the pico-phytoplankton component, above all in poor nutrient conditions. Regions with different and peculiar features are the northwestern Mediterranean Sea, the Alborán Sea and several coastal areas, such as the north Adriatic Sea. In these areas, local interactions between physical and biological components modulate the competition between the three phytoplankton size classes. It results that, during the spring bloom season, micro-phytoplankton dominates in areas of intense vertical winter mixing and deep/intermediate water formation; while, in coastal areas, micro-phytoplankton dominates in all seasons, thanks to the nutrients supply that comes from the terrestrial inputs. In the Alborán Sea, in which the Atlantic inflow modulates the nutrient availability, any predominance of one class over the other two has been observed. Nano-phytoplankton component instead remains widespread over the entire basin along the year, and its contribution to the TChl a is of the order of 30–50%. The inter-annual variability is observed in the whole basin, but the largest inter-annual signal occurs in the northwestern Mediterranean Sea, driven by the year-to-year variation in intensity and extension of the spring bloom. In absence of sufficient in situ data of community composition, the satellite-based analysis demonstrated that pico, nano and micro classes often coexist. The predominance of one group over the other ones is strongly dependent on the physical-biological processes occurring at mesoscale. These processes directly influence the nutrient and light availability, which are the principal forcing for the algae growth.

Time-series measurements of 234Th in water column and sediment trap samples from the northwestern Mediterranean Sea

2009 ◽  
Vol 56 (18) ◽  
pp. 1487-1501 ◽  
Author(s):  
J. Kirk Cochran ◽  
Juan Carlos Miquel ◽  
Robert Armstrong ◽  
Scott W. Fowler ◽  
Pere Masqué ◽  
...  
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Water Column ◽  
Sediment Trap ◽  
Northwestern Mediterranean Sea ◽  
Northwestern Mediterranean

scholarly journals Reproductive biology of Black Anglerfish (Lophius budegassa) in the northwestern Mediterranean Sea

2013 ◽  
Vol 111 (4) ◽  
pp. 390-401 ◽  
Author(s):  
Ana I. Colmenero ◽  
Víctor M. Tuset ◽  
Laura Recasens ◽  
Pilar Sánchez
Keyword(s):  
Mediterranean Sea ◽  
Reproductive Biology ◽  
Northwestern Mediterranean Sea ◽  
Northwestern Mediterranean
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