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Tuning a physically-based model of the air-sea gas transfer velocity

Tuning a physically-based model of the air-sea gas transfer velocity
Tuning a physically-based model of the air-sea gas transfer velocity
Air–sea gas transfer velocities are estimated for one year using a 1-D upper-ocean model (GOTM) and a modified version of the NOAA–COARE transfer velocity parameterization. Tuning parameters are evaluated with the aim of bringing the physically based NOAA–COARE parameterization in line with current estimates, based on simple wind-speed dependent models derived from bomb-radiocarbon inventories and deliberate tracer release experiments. We suggest that A = 1.3 and B = 1.0, for the sub-layer scaling parameter and the bubble mediated exchange, respectively, are consistent with the global average CO2 transfer velocity k. Using these parameters and a simple 2nd order polynomial approximation, with respect to wind speed, we estimate a global annual average k for CO2 of 16.4 ± 5.6 cm h?1 when using global mean winds of 6.89 m s?1 from the NCEP/NCAR Reanalysis 1 1954–2000. The tuned model can be used to predict the transfer velocity of any gas, with appropriate treatment of the dependence on molecular properties including the strong solubility dependence of bubble-mediated transfer. For example, an initial estimate of the global average transfer velocity of DMS (a relatively soluble gas) is only 11.9 cm h?1 whilst for less soluble methane the estimate is 18.0 cm h?1.
Gas exchange, Air–water interface, Air–sea interaction, Upper ocean, Diurnal warming, 1-D modelling, Transfer velocity, Carbon dioxide, GOTM
1463-5003
28-35
Jeffery, C.D.
fcdcf12f-3139-4605-8f52-8af2092ba5b0
Robinson, I.S.
548399f7-f9eb-41ea-a28d-a248d3011edc
Woolf, D.K.
aeb210e8-5fd5-4dd4-903e-6d4ef2df9abe
Jeffery, C.D.
fcdcf12f-3139-4605-8f52-8af2092ba5b0
Robinson, I.S.
548399f7-f9eb-41ea-a28d-a248d3011edc
Woolf, D.K.
aeb210e8-5fd5-4dd4-903e-6d4ef2df9abe

Jeffery, C.D., Robinson, I.S. and Woolf, D.K. (2010) Tuning a physically-based model of the air-sea gas transfer velocity. Ocean Modelling, 31 (1-2), 28-35. (doi:10.1016/j.ocemod.2009.09.001).

Record type: Article

Abstract

Air–sea gas transfer velocities are estimated for one year using a 1-D upper-ocean model (GOTM) and a modified version of the NOAA–COARE transfer velocity parameterization. Tuning parameters are evaluated with the aim of bringing the physically based NOAA–COARE parameterization in line with current estimates, based on simple wind-speed dependent models derived from bomb-radiocarbon inventories and deliberate tracer release experiments. We suggest that A = 1.3 and B = 1.0, for the sub-layer scaling parameter and the bubble mediated exchange, respectively, are consistent with the global average CO2 transfer velocity k. Using these parameters and a simple 2nd order polynomial approximation, with respect to wind speed, we estimate a global annual average k for CO2 of 16.4 ± 5.6 cm h?1 when using global mean winds of 6.89 m s?1 from the NCEP/NCAR Reanalysis 1 1954–2000. The tuned model can be used to predict the transfer velocity of any gas, with appropriate treatment of the dependence on molecular properties including the strong solubility dependence of bubble-mediated transfer. For example, an initial estimate of the global average transfer velocity of DMS (a relatively soluble gas) is only 11.9 cm h?1 whilst for less soluble methane the estimate is 18.0 cm h?1.

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More information

Published date: 2010
Keywords: Gas exchange, Air–water interface, Air–sea interaction, Upper ocean, Diurnal warming, 1-D modelling, Transfer velocity, Carbon dioxide, GOTM

Identifiers

Local EPrints ID: 69692
URI: http://eprints.soton.ac.uk/id/eprint/69692
ISSN: 1463-5003
PURE UUID: 73e682e8-d770-4a2e-97ce-45652f6ebcf8

Catalogue record

Date deposited: 25 Nov 2009
Last modified: 13 Mar 2024 19:41

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Contributors

Author: C.D. Jeffery
Author: I.S. Robinson
Author: D.K. Woolf

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