Details:

Journal Title:
Limnology and Oceanography
Personal Author:
Quiñones-Rivera, Z.J. ; Wissel, B. ; Turner, R.E. ; Rabalais, N.N. ; Justić, D. ; ... More +
Quiñones-Rivera, Z.J. ; Wissel, B. ; Turner, R.E. ; Rabalais, N.N. ; Justić, D. ; Finlay, K.P. ; Milan, C.S. Less -
NOAA Program & Office:
NGI (Northern Gulf Institute)
Description:
Dissolved oxygen (DO) and dissolved inorganic carbon (DIC) represent reciprocal sides of aquatic metabolism. In closed systems, absolute DO and DIC changes follow a ~ 1 : 1 ratio, but in open systems coupling depends on mixing, air–sea gas exchange, and anaerobic respiration. To quantify DO–DIC controls in coastal waters, we evaluated their concentrations and stable isotopes together with water quality and physical conditions across the hypoxic zone off the Louisiana continental shelf in July 2002 and July 2003. This area is characterized by high yet variable productivity and strong seasonal changes in vertical stratification and river discharge. Prior to 2003, this area was impacted by two tropical systems that could impact vertical stratification and mixing with offshore waters. The relationship between DO and DIC displayed three patterns: (1) In bottom waters, DO and DIC showed similar (opposing) trends in concentrations and stable isotopes in both years, largely associated with nutrients and algal biomass. (2) In 2002, DO and DIC concentrations in surface waters followed similar spatial patterns (reflecting algal biomass, salinity, and nutrients). However, due to different atmospheric gas exchange, DIC depletion exceeded DO supersaturation sixfold. Accordingly, short-term (DO) and long-term productivity (DIC) were on the same trajectory. (3) In 2003, DO and DIC were decoupled in surface waters. High DO concentrations correlated with algal biomass (recent production) while DIC concentrations followed salinity (past production). Understanding challenges and opportunities of using DO and DIC individually or combined is critical for quantifying metabolic patterns and capturing impacts of natural variability and climate change on eutrophic continental shelfs.
Keywords:
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Carbon Continental Shelf Oxygen Dissolved Inorganic Carbon Dissolved Oxygen
Source:
Limnol Oceanogr, 67: 2603-2616
DOI:
https://doi.org/10.1002/lno.12225
Format:
PDF
Document Type:
Journal Article
Funding:
Grant no. NA21OAR4320190
License:
https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:
CC BY-NC
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:c9306fbe856c8d50c5f4705d325f733fc25300dd055418680d6e4f7877f57a0e
Download URL:
https://repository.library.noaa.gov/view/noaa/52295/noaa_52295_DS1.pdf
File Type:

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