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BY : Siv K. Lauvset

WWW.BJERKNES.UIB.NO. NORTH ATLANTIC RELATIONSHIPS BETWEEN SURFACE fCO 2 AND HYDROGRAPHY, EVALUATED USING fCO 2 -SST RELATIONSHIPS. BY : Siv K. Lauvset

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BY : Siv K. Lauvset

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  1. WWW.BJERKNES.UIB.NO NORTH ATLANTIC RELATIONSHIPS BETWEEN SURFACE fCO2 AND HYDROGRAPHY, EVALUATED USING fCO2-SST RELATIONSHIPS BY: Siv K. Lauvset Are Olsen; Ingunn Skjelvan; Alberto Borges; Wei-Jun Cai; Yves Dandonneau; Melchor Gonzalez Davila; Truls Johannessen; Arne Körtzinger; Nathalie Lefevre; Xose A. Padin; Fiz F. Perez; Aida F. Rios; J. Magdalena Santana-Casiano; Ute Schuster; Tobias Steinhoff; Taro Takahashi; Doug Wallace; Rik Wanninkhof; Andy Watson

  2. STUDY • We use ~250,000 data points from Jan-Mar 1995-2007 covering the North Atlantic basin • Evaluate fCO2-SST relationships in 26 regions • Aim to increase understanding of circulation effects • The regions shown here are used to illustrate both the results and the methods used

  3. EGC NwAC LC NAC GS AC NEC NBC

  4. Overall positive trend • Not a direct effect of temperature change • A result of mixing of two different water masses fCO2 (matm) SST (ºC)

  5. No correlation • Two important water masses are first seen here • These characteristics can be traced eastward across the basin fCO2 (matm) SST (ºC)

  6. Two regions where frontal movements have great impact on fCO2 distribution • Both are related to shifts in NAO

  7. CONCLUSIONS • It is possible to follow a characteristic fCO2-SST signal in a specific water mass and/or current • Mixing between water masses and across frontal regions • Circulation changes can explain many of the observed changes in fCO2 in the North Atlantic

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