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Decadal Changes in the Atlantic, Pacific and Indian Ocean Inorganic Carbon Inventories by

Decadal Changes in the Atlantic, Pacific and Indian Ocean Inorganic Carbon Inventories by Christopher L. Sabine (PMEL), Richard A. Feely (PMEL), Simone Alin (PMEL), Frank Millero (RSMAS), Andrew Dickson (SIO), Rik Wanninkhof (RSMAS), Dana Greeley (PMEL) and Esa Peltola (RSMAS).

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Decadal Changes in the Atlantic, Pacific and Indian Ocean Inorganic Carbon Inventories by

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  1. Decadal Changes in the Atlantic, Pacific and Indian Ocean Inorganic Carbon Inventories by Christopher L. Sabine (PMEL), Richard A. Feely (PMEL), Simone Alin (PMEL), Frank Millero (RSMAS), Andrew Dickson (SIO), Rik Wanninkhof (RSMAS), Dana Greeley (PMEL) and Esa Peltola (RSMAS)

  2. Global Carbon Budget for 1990s published in the Nov. 2007 First State of the Carbon Cycle Report (SOCCR) Coastal C Exchanges Air-sea Flux Inventory changes adapted from Sabine et al., 2004

  3. A first look at the distribution of anthropogenic CO2 in the ocean was based on the WOCE/JGOFS/OACES global survey of carbon conducted in the 1990s. Global Ocean Anthropogenic CO2 Inventory (1800-1994): 118±19 PgC Column Inventory (mol m-2) We see deep penetration in the North Atlantic compared to the North Pacific. Generally deeper penetration in subtropics vs. tropics. Relatively little penetration in the high latitude S.O. Anthropogenic CO2 estimates are accumulation between 1800 and 1994 based on the DC* approach.

  4. CLIVAR/CO2 Repeat Hydrography R.A. Feely, C.L. Sabine, R. Wanninkhof, G.C. Johnson, J.L. Bullister, M. Barringer, C.W. Mordy, J.-Z. Zhang, D. Greeley, F.J. Millero, and A.G. Dickson Goal: To quantify decadal changes in the inventory and transport of heat, fresh water, carbon dioxide (CO2), chlorofluorocarbon tracers and related parameters in the oceans. Approach: The sequence and timing of the CLIVAR/CO2 Repeat Hydrography cruises have been selected so that there is roughly a decade between them and the WOCE/JGOFS global survey. Achievements: The U.S. CLIVAR/CO2 Repeat Hydrography Program has completed 11 of 18 lines and is on schedule to complete global survey by 2012. Global map of planned CLIVAR/CO2 Repeat Hydrography Program hydrographic sections http://ushydro.ucsd.edu/

  5. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. P02 along 30°N Japan to San Diego, CA June-August 2004 P16N along 152°W Tahiti to Kodiak, AK Feb.-March 2006 Comparison of crossover and overlap stations indicate the DIC data are good to +/- 1 µmol kg-1 and alkalinity data are good to +/- 2 µmol kg-1

  6. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. 1991 and 2006 P16N data along 41.425-41.450 σ3 surface. Deep comparisons in the Pacific also indicate no biases between WOCE and CLIVAR data. Comparison of crossover and overlap stations indicate the DIC data are good to +/- 1 µmol kg-1 and alkalinity data are good to +/- 2 µmol kg-1

  7. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. • Meridional sections in the Atlantic, Pacific and Indian oceans show that there are significant and measureable inorganic carbon changes in all three ocean basins over the last decade.

  8. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. • Meridional sections in the Atlantic, Pacific and Indian oceans show that there are significant and measureable inorganic carbon changes in all three ocean basins over the last decade. • We are working to improve our tools for isolating the anthropogenic component of the decadal carbon changes, including working with modelers to compare and interpret results. Figure from R. Sonnerup

  9. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. • Meridional sections in the Atlantic, Pacific and Indian oceans show that there are significant and measureable inorganic carbon changes in all three ocean basins over the last decade. • We are working to improve our tools for isolating the anthropogenic component of the decadal carbon changes, including working with modelers to compare and interpret results. • Diagnoses of the DIC changes suggest that variations in ocean circulation can have an important, and sometimes dominant, impact on the observed regional carbon distributions. Deutsch et al., 2006

  10. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. • Meridional sections in the Atlantic, Pacific and Indian oceans show that there are significant and measureable inorganic carbon changes in all three ocean basins over the last decade. • We are working to improve our tools for isolating the anthropogenic component of the decadal carbon changes, including working with modelers to compare and interpret results. • Diagnoses of the DIC changes suggest that variations in ocean circulation can have an important, and sometimes dominant, impact on the observed regional carbon distributions. • Preliminary analyses suggest that the regional anthropogenic carbon inventory changes over the last decade may have a different pattern from the long-term carbon storage distributions.

  11. CLIVAR/CO2 Repeat Hydrography Interim Results • Global Survey is 60% complete with all measurements meeting or exceeding anticipated quality requirements. • Meridional sections in the Atlantic, Pacific and Indian oceans show that there are significant and measureable inorganic carbon changes in all three ocean basins over the last decade. • We are working to improve our tools for isolating the anthropogenic component of the decadal carbon changes, including working with modelers to compare and interpret results. • Diagnoses of the DIC changes suggest that variations in ocean circulation can have an important, and sometimes dominant, impact on the observed regional carbon distributions. • Preliminary analyses suggest that the regional anthropogenic carbon inventory changes over the last decade may have a different pattern from the long-term carbon storage distributions.

  12. Thank you for your time! The NOAA Ship Ronald H. Brown Arriving in Easter Island for the 2nd Leg of P18 January 2008

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