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Seminario Acción Especial CLIVAR-España. Water masses and thermohaline variability in the Atlantic Ocean: consequences for C ANT accumulation. Instituto Nacional de Meteorología , Madrid 14-15, Febrero, 2005. Fiz F. Pérez, Aida F. Ríos, Marta Álvarez, Instituto de Investigaciones Marinas

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Instituto Nacional de Meteorología , Madrid 14-15, Febrero, 2005

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Seminario Acción Especial CLIVAR-España

Water masses and thermohaline variability in the Atlantic Ocean: consequences for CANT accumulation.

Instituto Nacional de Meteorología, Madrid

14-15, Febrero, 2005

Fiz F. Pérez, Aida F. Ríos, Marta Álvarez,

Instituto de Investigaciones Marinas

CSIC, Vigo


Decadal changes of -S relationship of the Eastern North Atlantic Central Water (ENAW) by Pérez, F.F., A.F. Ríos, B.A. King, R.T. Pollard.Deep-Sea Research, 1995.

Carbon dioxide along WOCE line A14: Water masses characterization and anthropogenic entry by Ríos, A. F.et al.

Journal Geophysical Research, Vol. 108 2003.

Physical and biogeochemical transport structure in the North Atlantic subpolar gyre by Álvarez M., F.F. Pérez, H. Bryden, A.F. Ríos.

Journal of Geophysical Research109 2004

The unaccounted role of Mediterranean water in the draw-down of anthropogenic carbon by

Álvarez M. Fiz F. Pérez, D. R. Shoosmith and H. L. Bryden.

Journal of Geophysical Research in revision


Pérez et al. ,2000.


ENACW saline change, NAO and Runoff

Pérez et al. ,2000.


AAIW

AAIW

WOCE A-14

WOCE A-14

Ríos et al., 2003


SAIW

Anthropogenic CO2 and CFC-age along the AAIW maximum

AAIW

Ríos et al., 2003


MW

at 1000 m

3.0 Sv

-3.4 Sv

0.4 Sv

Alvarez et al. JGR

The MW is formed from 2.3 Sv of ENACW and 0.3 Sv of AAIW.

Part of this transformation (0.7 Sv) occurs inside the Mediterranean Sea

105.5 kmol·s-1

9.4 kmol·s-1

2.7 Sv MW

0.7 Sv ENACW

0.3 Sv LSW

-0.3 Sv AA

-32.9 kmol·s-1

155 kmol.s-1 of Anthropogenic CO2

-41.2 kmol·s-1

-124 kmol.s-1

The MW formation drives a Cant draw-down and a salinity increase of MW because the ENACW entrained when MW is formed is saturated of Cant and its salinity is also increasing in 0.1 per decade.

This mechanism could be a negative feedback in future climate scenarios.

Total

Baroclinic

Horizontal

Figure 7.

10 kmol.s-1

.


Subpolar North Atlantic

Relevance of the Subpolar North Atlantic:

- area of deep water formation,

- large capacity to store and transport heat and CO2.

WOCE A25 or 4x section

- August-September 1997

- UK WOCE section from Vigo to Cape Farewell,


Water Masses along 4x: Mass (Sv) and CANT Trps (kmol/s)

2.9Sv

174kmol/s

10.3Sv

ENACW

SAIW

1.7Sv

MW

484 kmol/s

48kmol/s

-1.5 Sv

DSOW

-6.0Sv

ISOW

-36kmol/s

-113kmol/s

-5.4 Sv

5.6 Sv

159kmol/s

-8.8Sv

-274kmol/s

-324kmol/s

LSW

EGC

AAIW

0.9 Sv

0 kmol/s

LDW

Alvarez et al. 2004


The role of Subpolar North Atlantic

  • In the subpolar North Atlantic about 21 Sv of warm waters is transformed in deep and cold waters releasing 0.7 Pw of heat to the atmosphere.

  • 0.33 Gt of anthropogenic CO2 are transported to the north, a 14% is accumulated in the subpolar North Atlantic and 0.28 Gt of anthropogenic CO2 goes south with deep waters.


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