- 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
Mukul Tewari
General Information
|
RAL & TIIMES
Associate Scientist
Water System
Contact Information:
PO Box 3000, Boulder, CO 80307-3000
Office: FL2-3089
Tel: 303-497-2840
Email: muku@ucar.edu
Vita
Research Focus FY08:
IHOP_2002 data : WRF-ARW Comparison
In continuation of the earlier work (Lemone et al., 2008), we have compared the WRF (ARW) model simulation with the IHOP_2002 data. The model was initialized using land surface states from High Resolution Land Data assimilation system. We have used the 30 arcsec Modis Land use data instead of the old USGS landuse data for these simulations. The purpose of this work is to gain insight into how the surface influences convective boundary layer (CBL) fluxes and structure.
We find that the modeled sensible heat flux H is significantly larger than observed, while the latent heat flux LE is much closer to observed values. The fluxes follow the soil moisture largely because the input land use map does not capture the observed variation in vegetation. Because of the too-high H, the model overestimates the CBL depth, but the timing of cumulus cloudiness is reproduced for three of the four days we selected for our investigation.
WRF reproduces the cloud structure quite well and also the westward rise of the boundary layer depth. Further investigation for the roll generated cloud streets, their modulation is under progress.
Top view of adult Mountain Pine Beetle (actual size, 1/8 to 1/3 inch). Picture: Colorado State University)
Manitou Spring Bark Beetle Infestation : WRF Simulations
In order to assess the impact of landuse of mesoscale flow over the Manitou Spring (CO) region, the area where forest area is killed by bark beetle, we conducted high resolution WRF simulation introducing new landuse map for forest killed regions. The work is conducted in collaboration with Christine Wiedinmyer (ACD) and the analysis of the work is under progress.
Headwater - Noah Land Surface Model - SNODAS - WRF
In context with the Headwater Project, Livneh's formulation for the modification of albedo in Noah Land Surface Model (LSM) is implemented and tested for the 20 Nov 2003 snow case. The results are verified against SNOw Data Assimilation System (SNODAS - NOAA) and Modis data and coupled WRF simulations showed promising results.
Publications FY08:
Miao, S., F. Chen, M. A. LeMone, M. Tewari, Q. Li, Y. Wang, 2008: An observational and modeling study of characteristics of urban heat island and boundary layer structures in Beijing. J. Appl. Meteor. Climat.. (In Press)
LeMone, M. A., M. Tewari, F. Chen, J. G. Alfieri, D. Niyogi, 2008: Evaluation of the Noah land-surface model using data from a fair-weather IHOP_2002 day with heterogeneous surface fluxes. Mon. Wea. Rev.. (In Press)
Tewari M., F. Chen, W. Coirier, S. Kim, 2008: Impact of coupling a microscale computational fluid dynamics model with a mesoscale model on urban scale contaminant transport and dispersion. Submitted to Geophysical Research Letters.
Hong, S.,V. Lakshmi , E. E. Small, F. Chen, M. Tewari, and K. W. Manning, 2008: Simulation and validation of land surface variables using the Noah land and WRF Models compared to IHOP and MODIS observations. Submitted to J. Hydro. Meteor.