Abstract
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 language | English (US) |
|---|---|
| Title of host publication | Gas Transfer at Water Surfaces, 2002 |
| Publisher | Blackwell Publishing Ltd |
| Pages | 173-180 |
| Number of pages | 8 |
| Volume | 127 |
| ISBN (Electronic) | 9781118668634 |
| ISBN (Print) | 9780875909868 |
| DOIs | |
| State | Published - Jan 1 2001 |
| Externally published | Yes |
Publication series
| Name | Geophysical Monograph Series |
|---|---|
| Volume | 127 |
| ISSN (Print) | 0065-8448 |
| ISSN (Electronic) | 2328-8779 |
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ASJC Scopus subject areas
- Geophysics
Cite this
Water Column CO2 measurements during the gas EX-98 expedition. / Feely, R. A.; Wanninkhof, R.; Hansell, Dennis A; Lamb, M. F.; Greeley, D.; Lee, K.
Gas Transfer at Water Surfaces, 2002. Vol. 127 Blackwell Publishing Ltd, 2001. p. 173-180 (Geophysical Monograph Series; Vol. 127).Research output: Chapter in Book/Report/Conference proceeding › Chapter
}
TY - CHAP
T1 - Water Column CO2 measurements during the gas EX-98 expedition
AU - Feely, R. A.
AU - Wanninkhof, R.
AU - Hansell, Dennis A
AU - Lamb, M. F.
AU - Greeley, D.
AU - Lee, K.
PY - 2001/1/1
Y1 - 2001/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85040250060&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85040250060&partnerID=8YFLogxK
U2 - 10.1029/GM127p0173
DO - 10.1029/GM127p0173
M3 - Chapter
SN - 9780875909868
VL - 127
T3 - Geophysical Monograph Series
SP - 173
EP - 180
BT - Gas Transfer at Water Surfaces, 2002
PB - Blackwell Publishing Ltd
ER -