Data/hora: 07/06/2024 11:14:34

Provedor de dados: | 5
País: | France
Título: | A relationship between deep-sea benthic oxygen demand and oceanic primary productivity
Autores: | Christensen, Jp.
Data: | 2000-01
Ano: | 2000
Palavras-chave: | Fonds marins; Oxygène; Production primaire; Respiration; Sédiments; Deep-sea; Oxygen; Primary productivity; Respiration; Sediments.
Resumo: | A diagenetic model of porewater O-2 was used to examine the relationship between organic carbon flux to the sediments and benthic oxygen demand (BOD). The model predicted that the organic carbon influx to sediments balances BOD as long as sediments are oxygenated. The critical rate occurs when O-2 at infinite depth disappears. With influxes exceeding the critical rate, the O-2 flux into the sediments via molecular diffusion can not consume all incoming organic matter, and anaerobic conditions result in BOD underestimating the carbon influx. Given that low rates of deep-sea BOD approximate the carbon influx below 9 g.C.m(-2).y(-1), a significant multilinear regression was found between published BOD, primary productivity (P-p, both in g.C.m(-2).y(-1))(,) and water depth (X, m), BOD = 19.6537*X P--0.936411*(p)1.139487. Using this, BOD and the carbon flux to 1000 m were mapped worldwide. Global organic carbon fluxes to 1000 m totaled 2 328 MT . C . y(-1) (1 MT C = 10(12) g), 6% of the overlying primary productivity. The global BOD was 739 MT.C.y(-1), 32% of the 1000 m flux. For southern and northern hemispheres, the 1000 m carbon flux was similar (1178 and 1149 MT.C.y(-1)), while BOD differed (356 and 383 MT.C.y(-1)). Polar regions did not differ in their relationship of vertical carbon export to productivity.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00325/43578/44046.pdf

DOI:10.1016/S0399-1784(00)00101-8

http://archimer.ifremer.fr/doc/00325/43578/

Editor: | Gauthier-villars/editions Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 2000-01 , Vol. 23 , N. 1 , P. 65-82

Fonte:

2000 Ifremer/CNRS/IRD/Editions scientifiques et medicales Elsevier SAS

info:eu-repo/semantics/openAccess

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