- Director's Message
- Table of Contents
- Strategic Goals: Science, Facilities & Technology
- 1. Exploring atmospheric, Earth system, and solar processes, variability, and change
- 2. Investigating the interaction of the atmosphere, the broader Earth system, and human society
- 3. Improving prediction of weather, climate, and other atmospheric phenomena
- 4. Developing community models
- 5. Enabling innovative field experiments and measurement campaigns
- 6. Developing new instrumentation
- Research Catalog
Samuel Levis
General Information
|
CGD & TIIMES
Project Scientist
BGS
Contact Information:
PO Box 3000, Boulder, CO 80307-3000
Office: ML - 202D
Telephone: 303-497-1627
Email: slevis@ucar.edu
Home Page | Group Webpage - Vita
Research Focus FY08:
Difference in 2-m air temperature for all four seasons between the dynamic vegetation case and control run (DV-Y97 minus CTRL). Insignificant differences have been masked out.
High resolution figure
Sam Levis continues to work with, develop, and support the Community Land Model (CLM). Regarding model development, Sam upgraded CLM's CN module (Peter Thornton's Carbon-Nitrogen cycling model) to Dynamic Global Vegetation Model (dgvm) status. This means that CN can now simulate the movement of plant types across model grid cells (the way that the CLM-dgvm could before), instead of using satellite derived plant type distributions. Furthermore, Sam introduced to CN the "agro" part of the IBIS dgvm. As a result, now CLM-CN can simulate life cycles for maize, wheat, and soybean that respond to environmental conditions. Preliminary results suggest that such life cycles look more realistic than the simulated phenology of CLM-CN's generic crop. Regarding support, Sam continues to respond to hundreds of community (NCAR and external) requests per year regarding the CLM. This year for the first time Sam gave talks about Global Warming to high school students and to the Colorado Public Utilities Commission. Sam also spoke to a USDA panel visiting NCAR about recent advances in the CLM.
Community Service FY08:
- Guest Editor: Journal of Hydrology
Scientific Talks FY08:
- Vegetation modeling in the Community Land Model (Boulder, CO February 2008)
Publications FY08 (abstracts):
Cook, B., G. Bonan, S. Levis, H. Epstein, 2008: The thermoinsulation effect of snow cover within a climate model. Clim. Dyn., 31, 107-124.
Wang, Y., M. Notaro, Z. Liu, R. Gallimore, S. Levis, J. Kutzbach, 2008: Detecting vegetation-precipitation feedbacks in mid-Holocene North Africa from two climate models. Clim. Past, 4, 59-67.
Sacks, W., B. Cook, N. Buenning, S. Levis, J. Helkowski, 2008: Effects of global irrigation on the near-surface climate. Clim. Dyn., doi: 10.1007/s00382-008-0445-z.
Oleson, K. W., G.-Y. Niu, Z.-L. Yang, D. M. Lawrence, P. Thornton, P. Lawrence, R. Stockli, R. Dickinson, G. Bonan, S. Levis, A. Dai, T. Qian, 2008: Improvements to the community land model and their impact on the hydrological cycle. J. Geophys. Res., 113, G01021, doi: 10.1029/2007JG000563.
Cook, B. I., G. B. Bonan, S. Levis, H. E. Epstein, 2008: Rapid vegetation responses and feedbacks amplify climate model response to snow cover changes. Clim. Dyn., 30, 391-406, doi: 10.1007/s00382-007-0296-z.
Notaro, M., Y. Wang, Z. Liu, R. Gallimore, S. Levis, 2008: Combined statistical and dynamical assessment of simulated vegetation-rainfall interactions in North Africa during the mid-Holocene. Global Change Biology, 14, 347-368, doi: 10.1111/j.1365-24866.2007.001495.x.