Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda
Continuous underway measurements of atmospheric and surface seawater pCO 2 were collected on numerous cruises in the Sargasso Sea (32°N, 64°W) near Bermuda from June 1994 to November 1995. We observed that seawater pCO 2 was highly variable on different timescales, ranging from diel to seasonal. On...
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ftsouthampton:oai:eprints.soton.ac.uk:358352 2023-07-30T04:05:40+02:00 Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda Bates, Nicholas R. Takahashi, Taro Chipman, David W. Knap, Anthony H. 1998-07-15 https://eprints.soton.ac.uk/358352/ English eng Bates, Nicholas R., Takahashi, Taro, Chipman, David W. and Knap, Anthony H. (1998) Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda. Journal of Geophysical Research, 103 (C8), 15567-15585. (doi:10.1029/98JC00247 <http://dx.doi.org/10.1029/98JC00247>). Article PeerReviewed 1998 ftsouthampton https://doi.org/10.1029/98JC00247 2023-07-09T21:49:30Z Continuous underway measurements of atmospheric and surface seawater pCO 2 were collected on numerous cruises in the Sargasso Sea (32°N, 64°W) near Bermuda from June 1994 to November 1995. We observed that seawater pCO 2 was highly variable on different timescales, ranging from diel to seasonal. On diel timescales, pCO 2 changes of 5–25 µatm occurred in response to diurnal warming and cooling associated with solar heat fluxes. Over longer timescales, pCO 2 was influenced by atmospheric forcing and tropical cyclones. For example, a surface cooling of 3°C and decrease in pCO 2 of 45–50 µatm occurred after Hurricane Felix passed near Bermuda in August 1995. The decrease in pCO 2 was significant considering the annual change was 90–100 µatm. Over all timescales, temperature was the dominant control on pCO 2 variability. We found that surf ace pCO 2 conditions were accurately predicted from temperatures with small errors (4–9 µatm) if seasonal pCO 2 -temperature relationships were established. In future synthesis of regional pCO 2 data it should be feasible to use surface temperature, remotely sensed from space, as a tool for extrapolation over wider spatial scales in the North Atlantic subtropical gyre. Net annual fluxes of CO 2 for 1994 and 1995 (-0.25 to -0.6 mol CO 2 m -2 yr -1 ) were directed from atmosphere to ocean and were similar to values reported for 1989–1993 by Bates et al. [1996b]. We found that short-term variability of pCO 2 (diel warming and cooling or atmospheric forcing), frequency of sampling (every 3–4 days or monthly), or use of temperature-derived pCO 2 did not affect estimates of net yearly CO 2 fluxes by more than 10–20%. However, strong winds associated with hurricanes decreased the net annual flux of CO 2 into the ocean by 19–28% in 1995. The major sources of error for air-sea gas exchange was uncertainty associated with gas transfer-wind speed relationships and differences in the types of wind speed data used (daily averaged versus climatological). Such uncertainties make it difficult to ... Article in Journal/Newspaper North Atlantic University of Southampton: e-Prints Soton Bates ENVELOPE(-65.631,-65.631,-65.821,-65.821) Journal of Geophysical Research: Oceans 103 C8 15567 15585 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Continuous underway measurements of atmospheric and surface seawater pCO 2 were collected on numerous cruises in the Sargasso Sea (32°N, 64°W) near Bermuda from June 1994 to November 1995. We observed that seawater pCO 2 was highly variable on different timescales, ranging from diel to seasonal. On diel timescales, pCO 2 changes of 5–25 µatm occurred in response to diurnal warming and cooling associated with solar heat fluxes. Over longer timescales, pCO 2 was influenced by atmospheric forcing and tropical cyclones. For example, a surface cooling of 3°C and decrease in pCO 2 of 45–50 µatm occurred after Hurricane Felix passed near Bermuda in August 1995. The decrease in pCO 2 was significant considering the annual change was 90–100 µatm. Over all timescales, temperature was the dominant control on pCO 2 variability. We found that surf ace pCO 2 conditions were accurately predicted from temperatures with small errors (4–9 µatm) if seasonal pCO 2 -temperature relationships were established. In future synthesis of regional pCO 2 data it should be feasible to use surface temperature, remotely sensed from space, as a tool for extrapolation over wider spatial scales in the North Atlantic subtropical gyre. Net annual fluxes of CO 2 for 1994 and 1995 (-0.25 to -0.6 mol CO 2 m -2 yr -1 ) were directed from atmosphere to ocean and were similar to values reported for 1989–1993 by Bates et al. [1996b]. We found that short-term variability of pCO 2 (diel warming and cooling or atmospheric forcing), frequency of sampling (every 3–4 days or monthly), or use of temperature-derived pCO 2 did not affect estimates of net yearly CO 2 fluxes by more than 10–20%. However, strong winds associated with hurricanes decreased the net annual flux of CO 2 into the ocean by 19–28% in 1995. The major sources of error for air-sea gas exchange was uncertainty associated with gas transfer-wind speed relationships and differences in the types of wind speed data used (daily averaged versus climatological). Such uncertainties make it difficult to ... |
format |
Article in Journal/Newspaper |
author |
Bates, Nicholas R. Takahashi, Taro Chipman, David W. Knap, Anthony H. |
spellingShingle |
Bates, Nicholas R. Takahashi, Taro Chipman, David W. Knap, Anthony H. Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda |
author_facet |
Bates, Nicholas R. Takahashi, Taro Chipman, David W. Knap, Anthony H. |
author_sort |
Bates, Nicholas R. |
title |
Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda |
title_short |
Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda |
title_full |
Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda |
title_fullStr |
Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda |
title_full_unstemmed |
Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda |
title_sort |
variability of pco2 on diel to seasonal timescales in the sargasso sea near bermuda |
publishDate |
1998 |
url |
https://eprints.soton.ac.uk/358352/ |
long_lat |
ENVELOPE(-65.631,-65.631,-65.821,-65.821) |
geographic |
Bates |
geographic_facet |
Bates |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Bates, Nicholas R., Takahashi, Taro, Chipman, David W. and Knap, Anthony H. (1998) Variability of pCO2 on diel to seasonal timescales in the Sargasso Sea near Bermuda. Journal of Geophysical Research, 103 (C8), 15567-15585. (doi:10.1029/98JC00247 <http://dx.doi.org/10.1029/98JC00247>). |
op_doi |
https://doi.org/10.1029/98JC00247 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
103 |
container_issue |
C8 |
container_start_page |
15567 |
op_container_end_page |
15585 |
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1772817732165697536 |