AMT Atmospheric Measurement Techniques AMT Atmos. Meas. Tech. 1867-8548 Copernicus Publications Göttingen, Germany 10.5194/amt-5-3069-2012 Direct measurement of the oceanic carbon monoxide flux by eddy correlation Blomquist B. W. https://orcid.org/0000-0002-3366-6269 1 Fairall C. W. 2 Huebert B. J. 1 Wilson S. T. https://orcid.org/0000-0002-7289-0909 3 Department of Oceanography, University of Hawaii, Honolulu, HI 96822, USA NOAA Earth System Research Laboratory, Physical Sciences Division, Boulder, CO 80305, USA Center for Microbial Oceanography: Research and Education, University of Hawaii, Honolulu, HI 96822, USA 18 12 2012 5 12 3069 3075 Copyright: © 2012 B. W. Blomquist et al. 2012 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://amt.copernicus.org/articles/5/3069/2012/amt-5-3069-2012.html The full text article is available as a PDF file from https://amt.copernicus.org/articles/5/3069/2012/amt-5-3069-2012.pdf

This report presents results from a field trial of ship-based air–sea flux measurements of carbon monoxide (CO) by direct eddy correlation with an infrared-laser trace gas analyzer. The analyzer utilizes Off-Axis Integrated-Cavity-Output Spectroscopy (OA-ICOS) to achieve high selectivity for CO, rapid response (~2 Hz) and low noise. Over a two-day sea trial, peak daytime seawater CO concentrations were ~1.5 nM and wind speeds were consistently 10–12 m s<sup>−1</sup>. A clear diel cycle in CO flux with an early afternoon maximum was observed. An analysis of flux error suggests the effects of non-stationarity are important, and air–sea CO flux measurements are best performed in regions remote from continental pollution sources.

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