The source and distribution of dissolved and particulate organic matter in the Bay of St. Louis, northern Gulf of Mexico

2012 ◽  
Vol 96 ◽  
pp. 96-104 ◽  
Author(s):  
Yihua Cai ◽  
Laodong Guo ◽  
Xuri Wang ◽  
Allison K. Mojzis ◽  
Donald G. Redalje
Keyword(s):  
Organic Matter ◽  
Gulf Of Mexico ◽  
Particulate Organic Matter ◽  
Northern Gulf Of Mexico

scholarly journals A coupled physical-biological model of the Northern Gulf of Mexico shelf: model description, validation and analysis of phytoplankton variability

2011 ◽  
Vol 8 (7) ◽  
pp. 1881-1899 ◽  
Author(s):  
K. Fennel ◽  
R. Hetland ◽  
Y. Feng ◽  
S. DiMarco
Keyword(s):  
Organic Matter ◽  
Gulf Of Mexico ◽  
Primary Production ◽  
River System ◽  
Phytoplankton Growth ◽  
Biological Model ◽  
Model Description ◽  
Ecological Gradient ◽  
Northern Gulf Of Mexico ◽  
Plume Region

Abstract. The Texas-Louisiana shelf in the Northern Gulf of Mexico receives large inputs of nutrients and freshwater from the Mississippi/Atchafalaya River system. The nutrients stimulate high rates of primary production in the river plume, which contributes to the development of a large and recurring hypoxic area in summer, but the mechanistic links between hypoxia and river discharge of freshwater and nutrients are complex as the accumulation and vertical export of organic matter, the establishment and maintenance of vertical stratification, and the microbial degradation of organic matter are controlled by a non-linear interplay of factors. Unraveling these interactions will have to rely on a combination of observations and models. Here we present results from a realistic, 3-dimensional, physical-biological model with focus on a quantification of nutrient-stimulated phytoplankton growth, its variability and the fate of this organic matter. We demonstrate that the model realistically reproduces many features of observed nitrate and phytoplankton dynamics including observed property distributions and rates. We then contrast the environmental factors and phytoplankton source and sink terms characteristic of three model subregions that represent an ecological gradient from eutrophic to oligotrophic conditions. We analyze specifically the reasons behind the counterintuitive observation that primary production in the light-limited plume region near the Mississippi River delta is positively correlated with river nutrient input, and find that, while primary production and phytoplankton biomass are positively correlated with nutrient load, phytoplankton growth rate is not. This suggests that accumulation of biomass in this region is not primarily controlled bottom up by nutrient-stimulation, but top down by systematic differences in the loss processes.

Changing Dynamics of Dissolved Organic Matter Fluorescence in the Northern Gulf of Mexico Following the Deepwater Horizon Oil Spill

2016 ◽  
Vol 50 (10) ◽  
pp. 4940-4950 ◽  
Author(s):  
Eurico J. D’Sa ◽  
Edward B. Overton ◽  
Steven E. Lohrenz ◽  
Kanchan Maiti ◽  
R. Eugene Turner ◽  
...  
Keyword(s):  
Organic Matter ◽  
Gulf Of Mexico ◽  
Dissolved Organic Matter ◽  
Oil Spill ◽  
Deepwater Horizon ◽  
Deepwater Horizon Oil Spill ◽  
Northern Gulf Of Mexico
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