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Contribution of hurricanes to local and global estimates of air–sea exchange of CO2

Contribution of hurricanes to local and global estimates of air–sea exchange of CO2
Contribution of hurricanes to local and global estimates of air–sea exchange of CO2
The effect of hurricanes on the thermal and physical structure of the upper ocean has been described1 but their influence on the ocean carbon cycle and the exchange of carbon between ocean and atmosphere is not well understood. Here we present observations from the Sargasso Sea, before and after hurricane Felix in summer 1995, that show a short-lived (2–3 weeks) surface seawater cooling of about 4 °C, and a decrease in seawater partial pressure of CO2 by about 60 microatm. Despite the localized decrease in seawater partial pressure of CO2, strong winds during the passage of hurricane Felix increased the efflux of CO2 from ocean to atmosphere. We estimate that hurricane Felix and two other hurricanes increased the summertime efflux of CO2 into the atmosphere over this part of the Sargasso Sea by nearly 55%. We estimate that hurricanes contribute to the global ocean-to-atmosphere flux of CO2 by between +0.04 to +0.51 Pg C (1015 g C) per year. Such hurricane-forced effluxes are quantitatively significant compared to regional (14° to 50° N zone)2 and global effluxes2,3. Hurricanes therefore exert an important influence on ocean–atmosphere CO2 exchange and the inferred4 year-to-year variability of CO2 fluxes over the subtropical oceans.
0028-0836
58-61
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Knap, Anthony H.
c5c7e8b6-3a16-47e6-bdb3-78797bca42ee
Michaels, Anthony F.
f1417e33-1039-4229-8268-4a1521d1012c
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Knap, Anthony H.
c5c7e8b6-3a16-47e6-bdb3-78797bca42ee
Michaels, Anthony F.
f1417e33-1039-4229-8268-4a1521d1012c

Bates, Nicholas R., Knap, Anthony H. and Michaels, Anthony F. (1998) Contribution of hurricanes to local and global estimates of air–sea exchange of CO2. Nature, 395 (6697), 58-61. (doi:10.1038/25703).

Record type: Article

Abstract

The effect of hurricanes on the thermal and physical structure of the upper ocean has been described1 but their influence on the ocean carbon cycle and the exchange of carbon between ocean and atmosphere is not well understood. Here we present observations from the Sargasso Sea, before and after hurricane Felix in summer 1995, that show a short-lived (2–3 weeks) surface seawater cooling of about 4 °C, and a decrease in seawater partial pressure of CO2 by about 60 microatm. Despite the localized decrease in seawater partial pressure of CO2, strong winds during the passage of hurricane Felix increased the efflux of CO2 from ocean to atmosphere. We estimate that hurricane Felix and two other hurricanes increased the summertime efflux of CO2 into the atmosphere over this part of the Sargasso Sea by nearly 55%. We estimate that hurricanes contribute to the global ocean-to-atmosphere flux of CO2 by between +0.04 to +0.51 Pg C (1015 g C) per year. Such hurricane-forced effluxes are quantitatively significant compared to regional (14° to 50° N zone)2 and global effluxes2,3. Hurricanes therefore exert an important influence on ocean–atmosphere CO2 exchange and the inferred4 year-to-year variability of CO2 fluxes over the subtropical oceans.

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Published date: 3 September 1998
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 358365
URI: https://eprints.soton.ac.uk/id/eprint/358365
ISSN: 0028-0836
PURE UUID: 26d73396-e4e7-46a1-ba2b-1d820bdebf3a

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Date deposited: 04 Oct 2013 09:04
Last modified: 18 Jul 2017 03:30

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