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Role of the Southern Annular Mode (SAM) in Southern Ocean CO2 uptake

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Role of the Southern Annular Mode (SAM) in Southern Ocean CO2 uptake

Auteurs : Andrew Lenton [France] ; Richard J. Matear [Australie]

Source :

Global Biogeochemical Cycles [ 0886-6236 ] ; 2007-06.

RBID : ISTEX:3BBC15F043C8C5E133C4260EA922E69B2549AD7D

Descripteurs français

Wicri :
- topic : Changement climatique, Eau douce, Océan, Simulation.

English descriptors

Abstract

A biogeochemical ocean general circulation model, driven with NCEP‐R1 and observed atmospheric CO2 history, is used to investigate and quantify the role that the Southern Annular Mode (SAM), identified as the leading mode of climate variability, has in driving interannual variability in Southern Ocean air‐sea CO2 fluxes between 1980 and 2000. Our simulations show the Southern Ocean to be a region of decreased CO2 uptake during the positive SAM phase. The SAM induces changes in Southern Ocean CO2 uptake with a 2‐month time lag explaining 42% of the variance in the total interannual variability in air‐sea CO2 fluxes. Our analysis shows that the response of the Southern Ocean to the SAM is primarily governed by changes in ΔpCO2 (67%), and that this response is driven by changes in ocean physics that control the supply of nutrients to the upper ocean, primarily Dissolved Inorganic Carbon (DIC). The SAM is predicted to become stronger and more positive in response to climate change and our results suggest this will decrease the Southern Ocean CO2 uptake by 0.1PgC/yr per unit change in the SAM.

Url:

https://api.istex.fr/document/3BBC15F043C8C5E133C4260EA922E69B2549AD7D/fulltext/pdf

DOI: 10.1029/2006GB002714

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Le document en format XML

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<term>Dpco2</term>
<term>Dpco2 variability</term>
<term>Dsam</term>
<term>Export production</term>
<term>Flux response</term>
<term>Flux variability</term>
<term>Freshwater</term>
<term>Freshwater dilution fluxes</term>
<term>Geophys</term>
<term>Geopotential height anomaly</term>
<term>Global</term>
<term>Global biogeochem</term>
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<term>Green line</term>
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<term>Inorganic carbon</term>
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<term>Major ocean basins</term>
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<term>Nonseasonal variability</term>
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<term>Reasonable agreement</term>
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<term>Antarctic continent</term>
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<term>Black line</term>
<term>Circulation model</term>
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<term>Climate change</term>
<term>Component analysis</term>
<term>Conkright</term>
<term>Density structure</term>
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<term>Dpco2 variability</term>
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<term>Flux response</term>
<term>Flux variability</term>
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<term>Freshwater dilution fluxes</term>
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<term>Geopotential height anomaly</term>
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<term>Global biogeochem</term>
<term>Good agreement</term>
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<term>Oceanic response</term>
<term>Open ocean</term>
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<term>Reasonable agreement</term>
<term>Relative importance</term>
<term>Salinity</term>
<term>Significant role</term>
<term>Simulation</term>
<term>Southern annular mode</term>
<term>Southern ocean</term>
<term>Spatial maps</term>
<term>Spatial pattern</term>
<term>Surface temperature</term>
<term>Total response</term>
<term>Total variance</term>
<term>Unit change</term>
<term>Upper ocean</term>
<term>Uptake</term>
<term>Variability</term>
<term>Variance</term>
<term>Visbeck</term>
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<front><div type="abstract">A biogeochemical ocean general circulation model, driven with NCEP‐R1 and observed atmospheric CO2 history, is used to investigate and quantify the role that the Southern Annular Mode (SAM), identified as the leading mode of climate variability, has in driving interannual variability in Southern Ocean air‐sea CO2 fluxes between 1980 and 2000. Our simulations show the Southern Ocean to be a region of decreased CO2 uptake during the positive SAM phase. The SAM induces changes in Southern Ocean CO2 uptake with a 2‐month time lag explaining 42% of the variance in the total interannual variability in air‐sea CO2 fluxes. Our analysis shows that the response of the Southern Ocean to the SAM is primarily governed by changes in ΔpCO2 (67%), and that this response is driven by changes in ocean physics that control the supply of nutrients to the upper ocean, primarily Dissolved Inorganic Carbon (DIC). The SAM is predicted to become stronger and more positive in response to climate change and our results suggest this will decrease the Southern Ocean CO2 uptake by 0.1PgC/yr per unit change in the SAM.</div>
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Role of the Southern Annular Mode (SAM) in Southern Ocean CO2 uptake

Role of the Southern Annular Mode (SAM) in Southern Ocean CO2 uptake

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

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