Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments

5Citations
Citations of this article
30Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Biological uptake rates of inorganic carbon and nitrate were measured during two sequential tracer release gas exchange experiments, together known as the Southern Ocean Gas Exchange Experiment (SO GasEx) in the southwest Atlantic sector of the Southern Ocean Antarctic Zone (51°N, 38°W). Primary productivity estimated from 14C incubations ranged from 26.7 to 47.2 mmol C m-2 d-1 in the first experiment (Patch 1) and 13.7 to 39.4 mmol C m-2 d-1 in the second experiment (Patch 2). Nitrate-based productivity estimated from 15NO3 incubations ranged from 5.8 to 13.1 mmol C m-2 d-1 in Patch 1 and 1.9 to 7.1 mmol C m-2 d-1 in Patch 2. The average ratio of nitrate-based productivity to primary productivity (approximating the f ratio) was 0.24 in Patch 1 and 0.15 in Patch 2. Chlorophyll concentrations for both patches were less than 1 mg m-3. Photochemical efficiency (Fv/Fm) was low (∼0.3) in Patch 1 and moderate (∼0.45) in Patch 2. Si(OH)4 concentrations were potentially limiting (<1 mmol m-3 for Patch 1 and ∼3 mmol m-3 for Patch 2), while NH4+ concentrations were elevated (∼1 mmol m-3 for Patch 1 and ∼2.2 mmol m -3 for Patch 2) compared with typical open ocean Antarctic Zone water. We hypothesize that Patch 1 productivity was regulated by the availability of Si(OH)4, while Patch 2 productivity was regulated by grazers. Primary production and nitrate-based production (as a proxy for C export) determined here provide components for a mixed layer carbon budget from which the air-sea flux of CO2 will be quantified.

References Powered by Scopus

On the meridional extent and fronts of the Antarctic Circumpolar Current

2353Citations
N/AReaders
Get full text

Fluorometric analysis of chlorophyll a in the presence of chlorophyll b and pheopigments

2162Citations
N/AReaders
Get full text

UPTAKE OF NEW AND REGENERATED FORMS OF NITROGEN IN PRIMARY PRODUCTIVITY

2064Citations
N/AReaders
Get full text

Cited by Powered by Scopus

Wind Speed and Sea State Dependencies of Air-Sea Gas Transfer: Results From the High Wind Speed Gas Exchange Study (HiWinGS)

61Citations
N/AReaders
Get full text

Spring-summer net community production, new production, particle export and related water column biogeochemical processes in the marginal sea ice zone of the Western Antarctic Peninsula 2012-2014

26Citations
N/AReaders
Get full text

Lagrangian evolution of DMS during the Southern Ocean gas exchange experiment: The effects of vertical mixing and biological community shift

14Citations
N/AReaders
Get full text

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Cite

CITATION STYLE

APA

Lance, V. P., Strutton, P. G., Vaillancourt, R. D., Hargreaves, B. R., Zhang, J. Z., & Marra, J. (2012). Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments. Journal of Geophysical Research: Oceans, 117(4). https://doi.org/10.1029/2011JC007687

Readers' Seniority

Tooltip

PhD / Post grad / Masters / Doc 14

54%

Researcher 11

42%

Professor / Associate Prof. 1

4%

Readers' Discipline

Tooltip

Agricultural and Biological Sciences 8

35%

Earth and Planetary Sciences 8

35%

Environmental Science 7

30%

Save time finding and organizing research with Mendeley

Sign up for free