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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Air/sea constituent fluxes
  • Global Change: Atmosphere
  • Global Change: Biogeochemical processes

Abstract

CO2 seasonality indicates origins of post-Pinatubo sink

A. Angert

Berkeley Atmospheric Sciences Center, University of California, Berkeley, California, USA

S. Biraud

Berkeley Atmospheric Sciences Center, University of California, Berkeley, California, USA

C. Bonfils

Berkeley Atmospheric Sciences Center, University of California, Berkeley, California, USA

W. Buermann

Berkeley Atmospheric Sciences Center, University of California, Berkeley, California, USA

I. Fung

Berkeley Atmospheric Sciences Center, University of California, Berkeley, California, USA

An enhanced carbon sink of ∼2PgC/yr was observed following the Mount Pinatubo eruption. In this study we used a biogeochemical model (CASA) linked to an atmospheric tracer model (MATCH) with interannually varying transport, to predict the atmospheric CO2 response to various hypotheses for the enhanced sink. By comparing the modeled CO2 growth rate, and seasonal minimum with observation we found that global Net Primary Production could not have increased following the eruption. The enhanced sink is explained by several land and ocean sink mechanisms acting in concert.

Received 18 February 2004; accepted 6 May 2004; published 5 June 2004.

Citation: Angert, A., S. Biraud, C. Bonfils, W. Buermann, and I. Fung (2004), CO2 seasonality indicates origins of post-Pinatubo sink, Geophys. Res. Lett., 31, L11103, doi:10.1029/2004GL019760.

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