Heat and dissolved oxygen exchanges between the sediment and water column in a shallow salty lagoon
Author
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Fuente Stranger, Alberto de la
Admission date
dc.date.accessioned
2015-01-05T18:48:49Z
Available date
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2015-01-05T18:48:49Z
Publication date
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2014
Cita de ítem
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J. Geophys. Res. Biogeosci., 119, 596–613
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Identifier
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DOI: 10.1002/2013JG002413
Identifier
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https://repositorio.uchile.cl/handle/2250/126896
General note
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Artículo de publicación ISI
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Abstract
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Dissolved oxygen (DO) and heat exchanges across the water-sediment interface (WSI) of a
shallow lagoon are controlled by processes occurring on both sides of the WSI, particularly volumetric
source and sink on the sediment side and turbulent transport on the waterside. This article presents and
analyzes measurements of DO (Js) and heat (Hg) fluxes across the WSI in the extremely shallow lagoon of
Salar del Huasco (20.274°S, 68.883°W, 3800m above sea level), where volumetric source of DO and heat
exists in the sediment layer, related to benthic primary production and absorption of solar radiation,
respectively. Microprofiles of temperature and DO were measured, and they were used for measuring Js
and Hg, and volumetric source/sink terms in the sediments. This information was used to propose and
validate the simple theoretical framework to predict both the magnitude and direction of Js and Hg. On the
one hand, Js can be predicted with a simple algebraic expression, where the diffusional mass transfer
coefficient defines the magnitude of Js while the direction is controlled by the balance between DO
production and consumption in the sediments. On the other hand, solar radiation is absorbed in the upper
sediments, and this heat diffuses toward the water column and the sediments. The heat flux toward the
water column also induces unstable convection that promotes vertical transport across the WSI. The
theoretical framework proposed here will help to understand DO and heat budgets of shallow aquatic
systems in which solar radiation reaches the WSI.
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Patrocinador
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This article was financed by project
Iniciación Fondecyt 11100306