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Report of the CCSM Land Model Working Group
Wednesday, 22 June 2005
The Village at Breckenridge

The Land Model Working Group (LMWG) met on Wednesday, 22 June 2005. The format consisted of three short talks that provided updates on ongoing core projects and one extended talk and discussion on the hydrology project, an area of particular focus for the LMWG during the past year.

Carbon/Nitrogen model update - P. Thornton (NCAR)
        Complex feedback in global total land carbon in C4MIP integrations with P. Thornton (stable land carbon) and D. Lawrence (downward trending land carbon) hydrology is related to biases in model climate. It appears that the simulated Amazon precipitation is only barely sufficient to support a tropical rainforest and is essentially on the threshold of being a savanna.
        Preliminary C/N runs indicate reduced warming in future due to improved conditions for vegetation, e.g., nitrogen fertilization.

Prognostic canopy airspace I. Baker (CSU)
        A major goal for the LMWG is to implement a prognostic canopy airspace similar to that in SiB later this year. This should enable the land model to contribute to scientific research related to isotopes and other chemical species. This effort will require significant restructuring of land model code and is likely to be a significant software engineering challenge.
        Baker showed that prognostic canopy airspace coupled to 2-leaf radiative submodel (SiB3.0) significantly improves surface fluxes (particularly sensible heat flux) for Wisconsin Tower site.

Land cover change J. Feddema (U. Kansas)
        Update on land cover change experiments with released version of CCSM3.        Plan to evaluate sensitivity of land cover change to proposed hydrology and surface data set changes
        Showed data from P. Lawrence indicating that the recently adopted surface data set may be improved with use of MODIS data to identify bare soil fraction and PFT distribution.

Hydrology project K. Oleson (NCAR)
Oleson showed results from the three versions of hydrology modifications (Georgia Tech, U. Texas, NCAR). In general, these three solutions show largely similar improvements in hydrology. Overall, soils are notably wetter for all the new schemes and the partitioning of evapotranspiration into transpiration, soil evaporation, and canopy evaporation is much improved, although soil evaporation remains somewhat unrealistically high.
        Solicited working group for help with Tower Site data for validation of these and future changes to model. Reto Stockli and Steve Running both indicated that they have compiled Tower data from a number of sites that may serve to kick start this effort.


Richard Anyah, North Carolina State University
Ian Baker, Colorado State University
Gordon Bonan, NCAR
Marcia Branstetter, Oak Ridge National Laboratory
Sheri Conner Gausepohl, Colorado State University
Aiguo Dai, NCAR
Noah Diffenbaugh, Purdue University
Arthur Few, Rice University
Mark Flanner, University of California - Irvine
Inez Fung, University of California - Berkeley
Steven Ghan, Pacific Northwest National Laboratory
Lindsey Gulden, University of Texas at Austin
Andrea Hahmann, NCAR
Natalia Hasler, NCAR
Thomas Hilinski, Colorado State University
Forrest Hoffman, Oak Ridge National Laboratory
Anthony King, Oak Ridge National Laboratory
Hideyuki Kitabata, Central Research Institute of Electric Power Industry (CRIEPI)
Benjamin Lamptey, Pennsylvania State University
Peter Lawrence, University of Colorado
David Lawrence, NCAR
Samuel Levis, NCAR
Jicheng Liu, Boston University
Rebecca McKeown, Natural Resource Ecology Laboratory
Cynthia Nevison, NCAR/University of Colorado
Guo-Yue Niu, University of Texas at Austin
David Noone, University of Colorado
Keith Oleson, NCAR
Francis Otieno, Iowa State University
Lara Prihodko, Colorado State University
Taotao Qian, NCAR
Kevin Rader, NCAR
Jaganathan Ramasamy Gowder, University of Madras
James Randerson, University of California - Irvine
Diandong Ren, University of Oklahoma
Nan Rosenbloom, NCAR
Steven Running, University of Montana
Ulrike Seibt, Carnegie Institution
Muhammad Shaikh, Georgia Institute of Technology
Willis Shem, Georgia Institute of Technology
Peter Snyder, University of Illinois at Urbana-Champaign
Reto Stockli, NASA/ETH
Neil Suits, Colorado State University
Eric Sundquist, U. S. Geological Survey
Anastasia Svirejeva-Hopkins, Potsdam Institute for Climate Impact Research
Bin Tan, Boston University
Peter Thornton, NCAR
Bin Shui, NCAR
Shuyu Wang, State University of New York
Jih-Wang Wang, Colorado State University
Jiangfeng Wei, Georgia Institute of Technology
Zhenghui Xie, LASG Institute of Atmosphere
Jinho Yoon, University of Maryland
Xuejin Zhang, North Carolina State University