Keith Lindsay

Project Scientist
TIIMES - CGD
BGS

Contact Information:
PO Box 3000, Boulder, CO 80307-3000
Office: ML - 428B
Telephone: 303-497-1722
Email: klindsay@ucar.edu
Home Page

Project Summary:

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Annual global carbon dioxide concentration
(23 February 2007)

My research concerns the global carbon cycle, particularly in the ocean and how the oceanic carbon cycle couples to the terrestrial carbon cycle via concentrations of atmospheric of CO2. My research is conducted with global coupled climate models that have parameterizations of biogeochemical cycles incorporated into them. My work is done primarily with other members of the Biogeochemistry Working Group of CCSM, of which I am the community liaison.

In the last fiscal year, Oct. 2006 - Sep. 2007, we have performed extensive experiments with the BEC oceanic ecosystem model (Moore, Doney and Lindsay, GBC, 2004) and the terrestrial carbon-nitrogen model of Peter Thornton in the fully coupled CCSM3 model in its low resolution configuration (~3 degree for the ocean, T31 for the atmosphere). Feedbacks between biogeochemistry and climate are being analyzed and compared to previous studies and observational constraints.

In the near future, we plan to initiate spinup runs of the above biogeochemical parameterizations in configuration of CCSM that uses higher resolution, ~1 degree for the ocean, ~2x2.5 degree for the atmosphere, and more recent physical parameterizations. These runs are being performed in anticipation of incorporating a prognostic biogeochemical package into CCSM4, the construction of which will begin in the next fiscal year.

Presentations:

• Spinup Plans for CCSM3.5 Physics & BGC; Status of BEC for CCSM3.5, Boulder USA, February 2007
• Update on T31 Coupled Runs with BGC in CCSM3, Boulder USA, February 2007
• Update on T31 Coupled Runs with BGC in CCSM3, Breckenridge USA, June 2007

TIIMES External Collaborators:

Scott Doney, Woods Hole Oceanographic Institution (WHOI)
Keith Moore, University of California, Irvine

Publications:

Najjar, R. G., X. Jin, F. Louanchi, O. Aumont, K. Caldeira, S. C. Doney, J. C. Dutay, M. Follows, N. Gruber, F. Joos, K. Lindsay, E. Maier-Reimer, R. J. Matear, K. Matsumoto, P. Monfray, A. Mouchet, J. C. Orr, G. K. Plattner, J. L. Sarmiento, R. Schlitzer, R. D. Slater, M. F. Weirig, Y. Yamanaka, A. Yool, 2007: Impact of circulation on export production, dissolved organic matter, and dissolved oxygen in the ocean: Results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2). Global Biogeochemical Cycles, 21, GB3007, doi: 10.1029/2006GB002857.

Mikaloff-Fletcher, S. E., N. Gruber, A. R. Jacobson, M. Gloor, S. C. Doney, S. Dutkiewicz, M. Gerber, M. Follows, F. Joos, K. Lindsay, D. Menemenlis, A. Mouchet, S. A. Muller, J. L. Sarmiento, 2007: Inverse estimates of the oceanic sources and sinks of natural CO2 and the implied oceanic carbon transport. Global Biogeochemical Cycles, 21, GB1010, doi: 10.1029/2006GB002751.

Moore, J. K., S. C. Doney, K. Lindsay, N. Mahowald, A. F. Michaels, 2006: Nitrogen fixation amplifies the ocean biogeochemical response to decadal timescale variations in mineral dust deposition. Tellus, 58B, 560-572.

Bryan, F. O., G. Danabasoglu, P. R. Gent, K. Lindsay, 2006: Changes in ocean ventilation during the 21st century in the CCSM3. Ocean Modelling, 15, 141-156.