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| Titel |
Numerical tools to estimate the flux of a gas across the air–water interface and assess the heterogeneity of its forcing functions |
| VerfasserIn |
V. M. N. C. S. Vieira, F. Martins, J. Silva, R. Santos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-21), S.355-375 |
| Datensatznummer |
250018041
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| Publikation (Nr.) |
 copernicus.org/os-9-355-2013.pdf |
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| Zusammenfassung |
| A numerical tool was developed for the estimation of gas fluxes across the
air–water interface. The primary objective is to use it to estimate CO2
fluxes. Nevertheless application to other gases is easily accomplished by
changing the values of the parameters related to the physical properties of
the gases. A user-friendly software was developed allowing to build upon a
standard kernel a custom-made gas flux model with the preferred
parameterizations. These include single or double layer models; several
numerical schemes for the effects of wind in the air-side and water-side
transfer velocities; the effects of atmospheric stability, surface roughness
and turbulence from current drag with the bottom; and the effects on
solubility of water temperature, salinity, air temperature and pressure. An
analysis was also developed which decomposes the difference between the
fluxes in a reference situation and in alternative situations into its
several forcing functions. This analysis relies on the Taylor expansion of
the gas flux model, requiring the numerical estimation of partial derivatives
by a multivariate version of the collocation polynomial. Both the flux model
and the difference decomposition analysis were tested with data taken from
surveys done in the lagoon system of Ria Formosa, south Portugal, in which
the CO2 fluxes were estimated using the infrared gas analyzer (IRGA) and
floating chamber method, whereas the CO2 concentrations were estimated
using the IRGA and degasification chamber. Observations and estimations show
a remarkable fit. |
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