Interannual and decadal variability of the oceanic carbon sink in the North Atlantic subpolar gyre | Tellus B: Chemical and Physical Meteorology (original) (raw)

Interannual and decadal variability of the oceanic carbon sink in the North Atlantic subpolar gyre

Original Research Papers

• Antoine Corbiére
• Nicolas Metzl
• Gilles Reverdin
• Christian Brunet
• Taro Takahashi

Abstract

The evaluation of interannual and decadal variations of air-sea CO2 fluxes represents important step for understanding the changes in the global carbon cycle. In this study we analyse the variations of sea surface dissolved inorganic carbon (DIC) and total alkalinity (TA) in the North Atlantic over the period 1993.2003 (SURATLANT Program). The analysis focuses on the subpolar gyre (53°.N-62°.N/45.W-20°.W). Large interannual variability of DIC and air-sea CO2 fluxes is observed mostly during summer. In the extreme case, this region was a CO2 source in 2003 explained by a dramatic warming and the absence of late-summer bloom. At the decadal scale, DIC and TA concentrations appeared stable indicating a complex balance between primary production, vertical mixing, horizontal transport and anthropogenic CO2.We also found that winter fCO2 has increased at a rate of +2.8 μatm yr-1 between 1993 and 2003, due to strong surface warming (1.5.°C over 10 yr) particularly since winter 1995 when the North Atlantic Oscillation index moved into a negative phase. This resulted in a decrease of carbon uptake in the North Atlantic subpolar gyre, a trend also suggested for the period 1972.1989 but not captured by current class atmospheric inverse models.

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References

• 
  Antoine , D. , Morel , A. , Gordon , H. R. , Banzon , V. F. and Evans , R. H . 2005 . Brindging ocean color observations of the 1980s and 2000s in search of long term trends . J. Geophys. Res. 110 ( C06009 ), https://doi.org/10.1029/2004JC002620.
• 
  Baker , D. F. , Law , R. M. , Gurney , K. R. , Rayner , P. , Peylin , P. and co-authors. 2006. TransCom 3 inversion intercomparison: impact of transport model errors on the interannual variability of regional CO2 fluxes, 1988-2003. Global Biogeochem. Cycles 20, GB1002, https://doi.org/10.1029//2004GB002439.
• 
  Bates , N. R . 2001. Interannual changes of oceanic CO2 and biogeo-chemical properties in the Western North Atlantic subtropical gyre. Deep-Sea Res. 11 48(8-9), 1507 – 1528 .
• 
  Bousquet , R , Peylin , P. , Ciais , P. , Le Quere , C. , Friedlingstein , P. and Tans , P . 2000 . Regional changes in carbon dioxide fluxes of land and oceans since 1980 . _Science_290 , 1342 – 1346 .
• 
  Brewer , P. G. , Bradshaw , A. L. and Williams , R. T . 1986a. Measurements of total carbon dioxide and alkalinity in the North Atlantic Ocean in 1981. In: The Changing Carbon Cycle: A Global Analysis (eds. J. R. Traballca and D. E. Reichle ), Spinger-Verlag, NY, 348 – 370.
• 
  Brewer , P. G. , Takahashi , T. and Williams , R. T. 1986b. Transient tracers in the oceans (TTO) — hydrographic data and carbon dioxide systems with revised carbon chemistry data. NDP-004/R1, Carbon Dioxide Information Center, Oak Ridge national Laboratory, Oak Ridge, TN. Revised TTO data, 0.86 MB.
• 
  Chipman , D. W. , Marra , J. and Takahashi , T . 1993 . Primary production at 47°N and 20°W in the North Atlantic Ocean: a comparison between the 1-4C incubation method and the mixed layer carbon budget . Deep-Sea. Res. 40 ( 1/2 ), 151 – 169 .
• 
  Ciais , Ph. , Reichstein , M. , Viovy , N. , Granier , A. , Ogee , J. and co-authors. 2005. Europe-wide reduction in primary productivity caused by the heat and drought in 2003. Nature 437, 529 – 533.
• 
  Curry , R. and Mauritzen , C . 2005 . Dilution of the northern North Atlantic Ocean in recent decades . _Science_308 , 1772 – 1774 .
• 
  Dickson , A. G. and Millero , F. J . 1987 . A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media . Deep Sea Res. 34 ( 10 ), 1733 – 1743 .
• 
  DOE, 1994. Handbook of methods for the analysis of the various pa-rameters of the carbon dioxide system in seawater, version 2, edited by A. G. Dickson and C. Goyet. ORNL/CDIAC-74, Carbon Dioxide Inf, and Anai. cont. Oak Ridge Natl. Lab., Oak Ridge, Tenn.
• 
  Dore , J. E. , Lukas , R. , Sadler , D. W. and Karl , D. M . 2003 . Climate-driven changes to the atmospheric CO2 sink in the subtropical North Pacific Ocean . _Nature_424 , 754 – 757 .
• 
  Edmond , J. M . 1970 . High precision determination of titration alkalin-ity and total carbon dioxide content of sea water by potentiometric titration . Deep-Sea Res. 17 , 737 – 750 .
• 
  Friis , K. , Körtzinger , A. , Pätsch , J. and Wallace , D. W. R . 2005. On the temporal increase of anthropogenic CO2 in the subpolar North Atlantic. Deep-Sea Res. 152(5), 681 – 698.
• 
  Gloor , M. , Gruber , N. , Sarmiento , J. , Sabine , C. L. , Feely , R. A. and co-authors. 2003. A first estimate of present and preindustrial air-sea CO2 flux patterns based on ocean interior carbon measurements and models. Geophys. Res. Lett. 30, https://doi.org/10.1029//2002GL015594.
• 
  Gregg , W. W. , Conkright , M. E. , Ginoux , P. , O'Reilly , J. E. and Casey , N. W. 2003. Ocean primary production and climate: global decadal changes. Geophys. Res. Lett.30 , doi:https://doi.org/10.1029/2003GL016889.
• 
  Gruber , N. , Bates , N. R. and Keeling , C. D. 2002.Long-term observations of interannual variability in the North Atlantic carbon sink. Science 298, 2374 – 2378.
• 
  Gurney , K. R. , Law , R. M. , Denning , A. S. , Rayner , P. J. , Pak , B. C. and co-authors. 2004. Transcom 3 inversion intercomparison: model mean results for the estimation of seasonal carbon sources and sinks. Global Biogeochem. Cycles 18, https://doi.org/10.1029/2003GB002111.
• 
  Häldcinnen , S. and Rhines , P. B. 2004.Decline of subpolar North Atlantic circulation during the 1990s. Science 304, 555 – 559.
• 
  Hansson , I . 1973 . The determination of dissociation constants of carbonic acid in synthetic sea water in the salinity range of 20 — 40%o and temperature range of 5 — 30°C. Acta Chem. Scand. 27 , 931 – 944.
• 
  Haim , H. , Sando , A. B. , Drange , H. , Hansen , B. and Valdimarsson , H. 2005. Influence of the Atlantic subpolar gyre on the thermohaline circulation . _Science_309 , 1841 – 1844 .
• 
  Keeling , C. D . 1991. Surface Ocean CO2. NATO ASI series 115. The Global Carbon Cycle. Springer-Verlag, Berlin.
• 
  Keeling , C. D. , Brix , H. and Gruber , N . 2004. Seasonal and long-term dynamics of the upper ocean carbon cycle at station ALOHA near Hawaii. Global Biogeochem. Cycles 18, https://doi.org/10.1029/2004GB002227.
• 
  Lefevre , N. , Watson , A. J. , Cooper , D. J. , Weiss , R. F. , Takahashi , T. and co-authors. 1999._Assessing the seasonality of the oceanic sink for CO2 in the northern hemisphere. Global Biogeochem. Cycles_13 ( 2 ), 273 – 286.
• 
  Lefevre , N. , Watson , A. J. , Olsen , A. , Rios , A. F. , Perez , F. F. and co-authors. 2004. A decrease in the sink for atmospheric CO2 in the North Atlantic. Geophys. Res. Lett. 31(L07306), https://doi.org/10.1029/2003GL018957.
• 
  Lewis , E. and Wallace , D. W. R . 1998. Program Developed for CO2 sys-tem calculations. ORNLUDCIAC-105. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee.
• 
  Louanchi, E and Najjar, R. G. 2001 The mean annual cycle of nutrients and oxygen in the North Atlantic Ocean . Deep-Sea Res. II. 48 , 2155 – 2171 .
• 
  Luger , H. , Wallace , D. W. R. , Körtzinger, A. and Nojiri, Y. 2004. The pCO2 variability in the midlatitude North Atlantic Ocean dur-ing a full annual cycle. Global Biogeochem. Cycles 18, GB3023, https://doi.org/10.1029/2003GB002200.
• 
  Manning , A. C. and Keeling , R. F . 2005 . Global oceanic and land biotic carbon sinks from the Scripps atmospheric oxygen flasks sampling network . _Tellus_58B , 95 – 116 .
• 
  Marland , G. , Boden , T. A. and Andres , R. J . 2005. Global, regional, and national CO2 emissions. In: Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn, USA.
• 
  Mehrbach , C. , Culberson , C. H. , Hawley , J. E. and Pytkowicz , R. M . 1973 . Measurement of the apparent dissociation constants of carbonic acid in seawater at atmospheric pressure . _Limnol. Oceanogr_18 , 897 – 907 .
• 
  Millero , F. J. , Lee , K. and Roche , M . 1998 . Distribution of alkalinity in the surface waters of the major oceans . Mar Chem. 60 , 111 – 130 .
• 
  Omar , A. M. and Olsen , A . 2006 . Reconstructing the time history of the air-sea CO2 disequilibrium and its rate of change in the eastern subpolar North Atlantic, 1972-1989 . Geophys. Res. Lett. 33 ( L04602 ), https://doi.org/10.1029/2005GL025425.
• 
  Reverdin , G. , Durand , E , Mortensen , J. , Schott , F. , Valdimarsson , H. and co-authors. 2002. Recent changes in the surface salinity of the North Atlantic subpolar gyre. J. Geophys. Res. 107 (C12), 8010, https://doi.org/10.1029/2001JC001010.
• 
  Reynolds , R. W. and Smith , T. M . 1994 . Improved global sea surface temperature analyses using optimum interpolation . _J. Climate_7 , 929 – 948 .
• 
  Sabine , C. L. , Heymann , M. , Artaxo , R , Bakker , D. , Chen , C.-T. A. and co-authors. 2003. Current status and past trends of the carbon cycle. In: The Global Carbon Cycle: Integrating Humans, Climate, and the Nartural World. (eds. C. B. Field and M. R. Raupach ) SCOPE 62, Island Press, Washington, D.C., 17 – 44.
• 
  Sameoto , D . 2004. The 1990s: a unique decade for plankton change in the Northwest Atlantic. Fisheries and Oceans, Canada. Canadian Science Advisory Secretariat (CSAS). Research Document 2004/074. http://www.dfo-mpo.gc.caksas/.[ ](#main-text-CIT0037)
• 
  Takahashi , T. , Olafsson , J. , Broecker , W. S. Goddard , J. , Chipman , D. and co-authors. 1985. Seasonal study of the carbon-nutrient chemistry in the Denmark Strait area. In:Proceedings of a Nordic Symposium (ed. U. Stefansson ), J. Mar. Res., Institute Reykjavik 9, 20 – 36.
• 
  Takahashi , T. , Olafsson , J. , Goddard , J. G. , Chipman , D. W. and Suther-land , S. C . 1993 . Seasonal variations of CO2 and nutrients in the high latitude surface oceans: a comparative study . _Global Biogeochem. Cy-cles_7 , 843 – 878 .
• 
  Takahashi , T. , Sutherland , S. C. , Sweeney , C. , Poisson , A. , Metzl , N. and co-authors. 2002. Global sea-air flux based on climatological surface ocean pCO2 and seasonal biological and temperature effects. Deep Sea Res. 11 49, 1601 – 1622.
• 
  Wanninlchof , R . 1992 . Relationship between wind speed and gas ex-change over the ocean . J. Geophys. Res. 97 , 7373 – 7382 .
• 
  Weiss , R. F . 1974 . Carbon dioxyde in water and seawater: the solubility of an non-ideal gas . Mar Chem. 2 , 203 – 215 .
• 
  Weiss , R. F. and Price , B. A . 1980 . Nitrous oxide solubility in water and seawater . Mar Chem. 8 , 347 – 359 .
• 
  Wong , C. S. , Waser , N. A. D. , Nojiri , Y. , Whitney , E A. , Page , J. S. and Zheng , J . 2002 . Seasonal cycles of nutrients and dis-solved inorganic carbon at high and mid-latitudes in the North Pacific Ocean during the Slcaugran cruises: determination of new production and nutrient uptak ratios . _Deep Sea Res. II_49 , 5317 – 5338 .