Variability of natural hypoxia and methane in a coastal upwelling system: Oceanic physics or shelf biology?

Details Variability of natural hypoxia and methane in a coastal upwelling system: Oceanic physics or shelf biology? Variability of natural hypoxia and methane in a coastal upwelling system: Oceanic physics or shelf biology?

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316614m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 16, CiteID L16614

Mathematics

Logic

16

Biogeosciences: Anoxic And Hypoxic Environments (4802, 4834), Oceanography: General: Physical And Biogeochemical Interactions, Oceanography: General: Upwelling And Convergences (4964), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912)

Scientific paper

Emerging understanding of the variability of natural coastal hypoxia is divided between two main hypotheses: the biogeochemical oxygen demand linked to locally-driven organic matter decay or to supply of low-oxygen waters by physical processes. The precise role of either mechanism in triggering hypoxia has remained elusive. A combined methane and oxygen high resolution year-long hourly data time series in a coastal upwelling system suggests that these systems may be responding to a complex interaction between the two. The data show how anoxia is initially triggered by remote equatorial hypoxic waters after which it can be sustained by a local biogeochemical flux of exported production. Crucially, without a remote trigger the local forcing could not develop anoxic conditions because the physical flux of oxygen would be too high. The robustness of this interpretation is tested using a 10-year data set (1994-2003) with seasonal and interannual scales of variability.

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