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Observing mixed layer depth, nitrate and chlorophyll concentrations in the northwestern Mediterranean: A combined satellite and NO 3 profiling floats experiment ArchiMer
D'Ortenzio, Fabrizio; Lavigne, Heloise; Besson, Florent; Claustre, Herve; Coppola, Laurent; Garcia, Nicole; Laes-huon, Agathe; Le Reste, Serge; Malarde, Damien; Migon, Christophe; Morin, Pascal; Mortier, Laurent; Poteau, Antoine; Prieur, Louis; Raimbault, Patrick; Testor, Pierre.
Two profiling floats, equipped with nitrate concentration sensors were deployed in the northwestern Mediterranean from summer 2012 to summer 2013. Satellite ocean color data were extracted to evaluate surface chlorophyll concentration at float locations. Time series of mixed layer depths and nitrate and chlorophyll concentrations were analyzed to characterize the interplay between the physical-chemical and biological dynamics in the area. Deep convection (mixed layer depth > 1000 m) was observed in January–February, although high-nitrate surface concentrations could be already observed in December. Chlorophyll increase is observed since December, although high values were observed only in March. The early nitrate availability in subsurface layers, which...
Tipo: Text Palavras-chave: Bio-Argo; Mediterranean; Mixed layer; Bloom onset; Nitrate concentration; Ocean color satellite.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00211/32225/30673.pdf
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Nitrate Contamination of Groundwater: Determinants and Indicators AgEcon
Wick, Katharina; Heumesser, Christine; Schmid, Erwin.
Nitrogen is an important input to agricultural production but also detrimentally affects the environmental quality of air, soil and water. Identifying the determinants of nitrate pollution and in turn defining sensible performance indicators to design, enforce and monitor regulatory policies is therefore of utmost importance. Using data on more than 1000 Austrian municipalities, we provide a detailed econometric analysis of (1) the determinants of nitrate concentration in groundwater, and (2) the predictive abilities of one of the most commonly used agri-environmental indicators, the Nitrogen Balance. We find that the proportion of cropland exerts a positive effect on the nitrate content in groundwater. Additionally, environmental factors such as...
Tipo: Conference Paper or Presentation Palavras-chave: Nitrate concentration; Groundwater; Nitrogen Balance; Agriculture; Regression analysis.; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Production Economics.
Ano: 2010 URL: http://purl.umn.edu/109430
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