Prevalence of strong vertical CO2 and O-2 variability in the top meters of the ocean

Author(s)
Maria Ll. Calleja, Carlos M. Duarte, Marta Alvarez, Raquel Vaquer-Sunyer, Susana Agusti, Gerhard J. Herndl
Abstract

The gradient in the partial pressure of carbon dioxide (pCO(2)) across the air-sea boundary layer is the main driving force for the air-sea CO2 flux. Global data bases for surface seawater pCO(2) are actually based on pCO(2) measurements from several meters below the sea surface, assuming a homogeneous distribution between the diffusive boundary layer and the upper top meters of the ocean. Compiling vertical profiles of pCO(2), temperature, and dissolved oxygen in the upper 5-8 m of the ocean from different biogeographical areas, we detected a mean difference between the boundary layer and 5 m pCO(2) of 131 mu atm. Temperature gradients accounted for only 11% of this pCO(2) gradient in the top meters of the ocean; thus, pointing to a heterogeneous biological activity underneath the air-sea boundary layer as the main factor controlling the top meters pCO(2) variability. Observations of pCO(2) just beneath the air-sea boundary layer should be further investigated in order to estimate possible biases in calculating global air-sea CO2 fluxes.

Organisation(s)
Functional and Evolutionary Ecology
External organisation(s)
Royal Netherlands Institute for Sea Research, Universitat Autònoma de Barcelona , Consejo Superior de Investigaciones Científicas (CSIC), University of Western Australia, Instituto Español de Oceanografía, Lund University
Journal
Global Biogeochemical Cycles: an international journal of global change
Volume
27
Pages
941-949
No. of pages
9
ISSN
0886-6236
DOI
https://doi.org/10.1002/gbc.20081
Publication date
09-2013
Peer reviewed
Yes
Austrian Fields of Science 2012
106021 Marine biology
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/prevalence-of-strong-vertical-co2-and-o2-variability-in-the-top-meters-of-the-ocean(69037b83-ed4a-43c7-8ed0-8fbb7aa7dcc5).html