Transport of Dissolved Organic Nitrogen in Mississippi River Plume and Texas-Louisiana Continental Shelf Near-Surface Waters

Estuaries ◽  
1994 ◽  
Vol 17 (4) ◽  
pp. 796 ◽  
Author(s):  
Diego López-Veneroni ◽  
Luis A. Cifuentes ◽  
Diego Lopez-Veneroni
Keyword(s):  
Continental Shelf ◽  
Surface Waters ◽  
Mississippi River ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
River Plume ◽  
Near Surface ◽  
Mississippi River Plume ◽  
Louisiana Continental Shelf

scholarly journals The stoichiometry of inorganic carbon and nutrient removal in the Mississippi River plume and adjacent continental shelf

2012 ◽  
Vol 9 (7) ◽  
pp. 2781-2792 ◽  
Author(s):  
W.-J. Huang ◽  
W.-J. Cai ◽  
R. T. Powell ◽  
S. E. Lohrenz ◽  
Y. Wang ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Mississippi River ◽  
Inorganic Carbon ◽  
River Plume ◽  
Total Alkalinity ◽  
Salinity Range ◽  
Ocean Mixing ◽  
Biological Removal ◽  
Mississippi River Plume ◽  
Biological Uptake

Abstract. The stoichiometry of dissolved inorganic carbon (DIC) and nutrients during biological uptake is widely assumed to follow the Redfield ratios (especially the C / N ratio) in large river plume ecosystems. However, this assumption has not been systematically examined and documented, because DIC and nutrients are rarely studied simultaneously in river plume areas and interpretation of ratios can be confounded by strong river–ocean mixing as well as intense biological activity. We examined stoichiometric ratios of DIC and nutrients (NO3-, PO43- and Si[OH]4) in the Mississippi River plume and adjacent continental shelf in June 2003 and August 2004 and calculated biological removal as the difference between observed concentrations and those predicted from conservative mixing, as determined from a multi-end-member mixing model and observed salinity and total alkalinity. Despite complex physical and biogeochemical influences, relationships between DIC and nutrients were strongly dependent on salinity range and geographic location, and influenced by biological removal. Lower C / Si and N / Si ratios in one nearshore area were likely due to localized input of high Si and low NO3- water from adjacent wetlands or preferential removal of nitrogen in the area. When net biological uptake was separated from river–ocean mixing and corrected for preferential N removal, the stoichiometric ratio of C / N / Si was similar to the Redfield ratio, thus supporting the applicability of the Redfield-type C / N / Si ratios in river-plume biogeochemical models.

scholarly journals The stoichiometric ratio during biological removal of inorganic carbon and nutrient in the Mississippi River plume and adjacent continental shelf

2012 ◽  
Vol 9 (2) ◽  
pp. 1557-1585
Author(s):  
W.-J. Huang ◽  
W.-J. Cai ◽  
R. T. Powell ◽  
S. E. Lohrenz ◽  
Y. Wang ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Mississippi River ◽  
Inorganic Carbon ◽  
River Plume ◽  
Total Alkalinity ◽  
Ocean Mixing ◽  
Biological Removal ◽  
Mississippi River Plume ◽  
Redfield Ratios ◽  
Stoichiometric Ratios

Abstract. The stoichiometric ratios of dissolved inorganic carbon (DIC) and nutrients during biological removal have been widely assumed to follow the Redfield ratios (especially the C/N ratio) in large river plume ecosystems. However, this assumption has not been systematically examined and documented because DIC and nutrients are rarely studied simultaneously in a river plume area, a region in which they can be affected by strong river-ocean mixing as well as intense biological activity. We examined stoichiometric ratios of DIC, total alkalinity (TA), and nutrients (NO3, PO43− and Si(OH)4) data during biological removal in the Mississippi River plume and adjacent continental shelf in June 2003 and August 2004 with biological removals defined as the difference between measured values and values predicted on the basis of conservative mixing determined using a multi-endmember mixing model. Despite complex physical and biogeochemical influences, relationships between DIC and nutrients were strongly dependent on salinity range and geographic location, and influenced by biological removal. Lower C/Si and N/Si ratios in one nearshore area were attributed to a potential silicate source induced by water exchange with coastal salt marshes. When net biological uptake was separated from river-ocean mixing and the impact of marshes and bays excluded, stoichiometric ratios of C/N/Si were similar to the Redfield ratios, thus supporting the applicability of the Redfield-type C/N/Si ratios as a principle in river-plume biogeochemical models.

Amino acid cycling in the Mississippi River Plume and effects from the passage of Hurricanes Isadore and Lili

2014 ◽  
Vol 136 ◽  
pp. 10-21 ◽  
Author(s):  
Thomas S. Bianchi ◽  
Bryan L. Grace ◽  
Kevin R. Carman ◽  
Ivan Maulana
Keyword(s):  
Amino Acid ◽  
Mississippi River ◽  
River Plume ◽  
Mississippi River Plume

scholarly journals Carbon dynamics and community production in the Mississippi River plume

2011 ◽  
Vol 57 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Xianghui Guo ◽  
Wei-Jun Cai ◽  
Wei-Jen Huang ◽  
Yongchen Wang ◽  
Feizhou Chen ◽  
...  
Keyword(s):  
Mississippi River ◽  
Carbon Dynamics ◽  
River Plume ◽  
Mississippi River Plume ◽  
Community Production

Nutritional Condition of Spot Larvae Associated with the Mississippi River Plume

1990 ◽  
Vol 119 (6) ◽  
pp. 957-965 ◽  
Author(s):  
Allyn B. Powell ◽  
Alexander J. Chester ◽  
John J. Govoni ◽  
Stanley M. Warlen
Keyword(s):  
Mississippi River ◽  
Nutritional Condition ◽  
River Plume ◽  
Mississippi River Plume
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