Experimental determination of the organic carbon flux from open-ocean surface waters

Article Abstract:

Organic carbon flux from the euphotic zone of the ocean to deep waters is one of the main controls of carbon dioxide atmospheric pressure. It is important to accurately determine the flux to understand the global carbon cycle and how it resonds to climate change. The accuracy of the biological organic carbon pump is assessed through comparison of results from three experimental approaches to measure export of organic carbon in the North Pacific Ocean. It is possible that the region could be responsible for around half of the global-ocean biological organic carbon pump,

Observations, Carbon, Oceanographic research

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The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean

Article Abstract:

A number of independent data sets from the continuing Hawaii Ocean Time-series research initiative supply evidence for the significance of biological dinitrogen (N2) fixation as a source of new nitrogen (N) for the pelagic ecosystem at a station that is thought to be typical of the subtropical North Pacific Ocean. It appears that N2 fixation could supply up to half of the N needed to sustain the rate of the annual particulate N export from the euphotic area. This research indicates a previously unknown season variability in sources of new N.

Nitrogen, Nitrogen fixation, Chemical oceanography

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Ecosystem changes in the North Pacific subtropical gyre attributed to the 1991-92 El Nino

Article Abstract:

A significant variation in the structure and production of pelagic ecosystem in the North Pacific Ocean is attributed to the 1991-92 El Nino-Southern Oscillation (ENSO). The pelagic ecosystem is found in the subtropical ocean gyers, which are marine analogues of terrestrial deserts. The variation results in nutrient cycling and a change in circulation of nutrient materials such as nitrogen and phosphorus compounds. These in turn affect the global carbon cycle.

Pacific Ocean, Biotic communities, Carbon cycle (Biogeochemistry), Carbon cycle

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