Data/hora: 06/06/2024 01:06:13

Provedor de dados: 	5	
País: 	France	
Título: 	Factors regulating the Great Calcite Belt in the Southern Ocean and its biogeochemical significance	
Autores: 	Balch, William M.; Bates, Nicholas R.; Lam, Phoebe J.; Twining, Benjamin S.; Rosengard, Sarah Z.; Bowler, Bruce C.; Drapeau, Dave T.; Garley, Rebecca; Lubelczyk, Laura C.; Mitchell, Catherine; Rauschenberg, Sara.	
Data: 	2016-08	
Ano: 	2016	
Palavras-chave: 	Coccolithophores; Trace metals; Carbonate chemistry; Southern Ocean; Subantarctic Front; Subtropical Front.	
Resumo: 	The Great Calcite Belt (GCB) is a region of elevated surface reflectance in the Southern Ocean (SO) covering similar to 16% of the global ocean and is thought to result from elevated, seasonal concentrations of coccolithophores. Here we describe field observations and experiments from two cruises that crossed the GCB in the Atlantic and Indian sectors of the SO. We confirm the presence of coccolithophores, their coccoliths, and associated optical scattering, located primarily in the region of the subtropical, Agulhas, and Subantarctic frontal regions. Coccolithophore-rich regions were typically associated with high-velocity frontal regions with higher seawater partial pressures of CO2 (pCO(2)) than the atmosphere, sufficient to reverse the direction of gas exchange to a CO2 source. There was no calcium carbonate (CaCO3) enhancement of particulate organic carbon (POC) export, but there were increased POC transfer efficiencies in high-flux particulate inorganic carbon regions. Contemporaneous observations are synthesized with results of trace-metal incubation experiments, Th-234-based flux estimates, and remotely sensed observations to generate amandala that summarizes our understanding about the factors that regulate the location of the GCB.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00383/49412/49883.pdf

DOI:10.1002/2016GB005414

https://archimer.ifremer.fr/doc/00383/49412/	
Editor: 	Amer Geophysical Union	
Formato: 	application/pdf	
Fonte: 	Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2016-08 , Vol. 30 , N. 8 , P. 1124-1144	
Fonte: 	2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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