Water Column CO2 measurements during the gas EX-98 expedition

R. A. Feely, R. Wanninkhof, Dennis A Hansell, M. F. Lamb, D. Greeley, K. Lee

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Scopus citations


During the recent GasEx-98 cruise in the North Atlantic aboard the NOAA ship Ronald H. Brown, carbon measurements were performed in the area of 46°N, 20.5°W. This process study followed a warm core ring tagged with the deliberately introduced tracer, SF6. Continuous surface water measurements were combined with vertical profiles sampled daily to depths up to 1000 m for carbon mass balance studies. Dissolved inorganic carbon (DIC) and fCO2 measurements were conducted onboard in both underway and discrete analysis modes. During the 25-day experiment in the tagged patch surface water fCO2 values averaged 275 ± 9 µatm, providing a constant condition of undersaturation and flux of CO2 into the ocean. Using the Wanninkhof [1992] exchange coefficient, the estimated CO2 flux ranged from approximately 1-27 mol m~2 yr_1. The largest CO2 flux occurred during a large wind event beginning on June 6. After the event, DIC and fCO2 values decreased for a few days, as a result of increased productivity associated with the strong mixing event. The DIC results were combined with the TOC, TON, and nutrient data to provide a mass balance for carbon within the patch. The results for the 25-day period indicate DIC increases in the mixed layer ranging from 0.2-1.8 µmol kg-1 d-1 due to gas exchange.

Original languageEnglish (US)
Title of host publicationGas Transfer at Water Surfaces, 2002
PublisherBlackwell Publishing Ltd
Number of pages8
ISBN (Electronic)9781118668634
ISBN (Print)9780875909868
StatePublished - Jan 1 2001
Externally publishedYes

Publication series

NameGeophysical Monograph Series
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

ASJC Scopus subject areas

  • Geophysics


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