Data/hora: 16/06/2024 03:29:29

Provedor de dados: | 5
País: | France
Título: | Climatological distribution of aragonite saturation state in the global oceans
Autores: | Jiang, Li-qing; Feely, Richard A.; Carter, Brendan R.; Greeley, Dana J.; Gledhill, Dwight K.; Arzayus, Krisa M.
Data: | 2015-10
Ano: | 2015
Resumo: | Aragonite saturation state (Ωarag) in surface and subsurface waters of the global oceans was calculated from up-to-date (through the year of 2012) ocean station dissolved inorganic carbon (DIC) and total alkalinity (TA) data. Surface Ωarag in the open ocean was always supersaturated (Ω &gt; 1), ranging between 1.1 and 4.2. It was above 2.0 (2.0–4.2) between 40°N and 40°S but decreased toward higher latitude to below 1.5 in polar areas. The influences of water temperature on the TA/DIC ratio, combined with the temperature effects on inorganic carbon equilibrium and apparent solubility product (K′sp), explain the latitudinal differences in surface Ωarag. Vertically, Ωarag was highest in the surface mixed layer. Higher hydrostatic pressure, lower water temperature, and more CO2 buildup from biological activity in the absence of air-sea gas exchange helped maintain lower Ωarag in the deep ocean. Below the thermocline, aerobic decomposition of organic matter along the pathway of global thermohaline circulation played an important role in controlling Ωarag distributions. Seasonally, surface Ωarag above 30° latitudes was about 0.06 to 0.55 higher during warmer months than during colder months in the open-ocean waters of both hemispheres. Decadal changes of Ωarag in the Atlantic and Pacific Oceans showed that Ωarag in waters shallower than 100 m depth decreased by 0.10 ± 0.09 (−0.40 ± 0.37% yr−1) on average from the decade spanning 1989–1998 to the decade spanning 1998–2010.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00293/40401/38958.pdf

https://archimer.ifremer.fr/doc/00293/40401/38959.docx

DOI:10.1002/2015GB005198

https://archimer.ifremer.fr/doc/00293/40401/

Editor: | Amer Geophysical Union
Formato: | application/pdf
Fonte: | Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2015-10 , Vol. 29 , N. 10 , P. 1656-1673

Fonte:

2015. American Geophysical Union. This article is a US Government work and, as such, is in the public domain in the United States of America.

info:eu-repo/semantics/openAccess

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