Mixing analysis of nutrients, oxygen and inorganic carbon in the Canary Islands region.

Pérez, Fiz F., Mintrop, Ludger, Llinás, O., Glez-Dávila, M., Castro, C. G., Alvarez, M., Körtzinger, Arne , Santana-Casiano, M., Rueda, M. J. and Ríos, A. F. (2001) Mixing analysis of nutrients, oxygen and inorganic carbon in the Canary Islands region. Journal of Marine Systems, 28 . pp. 183-201. DOI 10.1016/S0924-7963(01)00003-3.

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We show the distribution of nutrients, oxygen, total dissolved inorganic carbon (CT) and total alkalinity (AT) along three sections close to the Canary Islands, between 18°W and the African coast during Meteor 37/2 cruise (January 1997). From the thermohaline properties of Eastern North Atlantic Central Water (ENACW), Mediterranean Water (MW), Antarctic Intermediate Water (AAIW) and North Atlantic Deep Water (NADW), a mixing model has been established based on the water mass description. It can explain most of the variabilities found in the distribution of the chemical variables, including the carbon system, and it is validated through the use of conservative chemical variables like ‘NO.’ From nutrients, oxygen, AT and CT, the chemical characterisation of the water masses was performed by calculating the concentration of these variables in the previously defined thermohaline end-members. The relative variation of nutrient concentrations, resulting from the regeneration of organic matter, was estimated. Close to the African shelf-break, a poleward undercurrent conveying as much as a 11% of AAIW was observed only in the southern section (28.5°N). From the chemical and thermohaline properties of the end-members, a comparison with data from other oceanic regions was made in respect to conservative chemical variables (‘NO’). In addition, a north–south gradient in the ventilation pattern of water masses is observed from the residuals of the model.

Document Type: Article
Keywords: Water masses; CO2; Oxygen; Nutrients; ‘NO’; ‘NCO’; North Atlantic
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0924-7963(01)00003-3
ISSN: 0924-7963
Projects: MAS3-CT96-60
Date Deposited: 18 Feb 2008 17:25
Last Modified: 12 Jul 2017 09:55
URI: http://oceanrep.geomar.de/id/eprint/3228

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