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Aiguo Dai

General Information

Aiguo Dai

CGD & TIIMES
Scientist III
Water System

Contact Information:
PO Box 3000, Boulder, CO 80307-3000
Office: ML-274
Telephone: 303-497-1357
Email: adai@ucar.edu
Home Page - Vita

Research Focus FY08:

The phase (local solar time in hrs of the maximum, left column) and amplitude (in % of daily mean, right column) of the 24-hr harmonic estimated from the mean diurnal anomalies of JJA precipitation frequency for non-drizzle and showery precipitation from surface weather reports (top two rows), and of JJA precipitation amount from MI (3rd row), TRMM 3B42 (4th row), PRESIANN (5th row), and CMORPH (bottom row). Note the normalized amplitude is not shown (i.e., white color) over the subtropical areas where the mean precipitation is less than 0.1 mm/day.

High resolution figure

In FY08, Dr. Dai continues his research in the fields of the hydrologic cycle, hydrometeorology, and climate change. In particular, he has expanded his research in applying satellite observations to document precipitation variability and evaluate models. His Climate Dynamics study is the first comprehensive analysis to quantify the frequency, intensity and diurnal cycle of precipitation over the globe using both in-situ surface and satellite observations. His GRL paper presents the first global analysis of the temperature and pressure dependence of the snow-rain phase transition and provides an analytic parameterization for use in climate and hydrologic modeling and remote sensing. During this period, Dr. Dai also has had productive collaborations with several non-NCAR groups, including scientists in Australia and China.

Community Service FY08:

  • AMS Committee on Climate Variability and Change, American Meteorological Society (AMS)
  • NASA's Precipitation Science Team, NASA
  • NRC Committee to Review of CCSP Report SAP 1.3, The National Research Council (NRC)
  • Co-Chair: Organizing Committee for AMS 19th Symposium on Climate Variability and Change, American Meteorological Society (AMS)
  • Chair: Organizing Committee for AMS 20th Symposium on Climate Variability and Change, American Meteorological Society (AMS)
  • Overseas Team on Coupled Model Development, Chinese Academy of Sciences
  • Graduate Research Advisor: Hongmei Li, Institute of Atmospheric Research, Chinese Academy of Sciences (Beijing)
  • Thesis Committee (PhD): Todd Ellis, Colorado State University, Fort Collins, CO

Publications FY08 (abstracts):

Wang, J., A. Dai, 2008: Understanding warm-season precipitation diurnal cycle over the central U.S.. Geophys. Res. Lett.. (Submitted)1

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: 10.1029/2007JG000563.4

Hobbins, M. T., A. Dai, M. L. Roderick, G. D. Farquhar, 2008: Revisiting the parameterization of potential evaporation as a driver of long-term water balance trends. Geophys. Res. Lett., 35, L12403, doi: 10.1029/2008GL033840.2

Zhou, L., A. Dai, Y. Dai, R. S. Vose, C.-Z. Zou, Y. Tian, H. Chen, 2008: Spatial dependence of diurnal temperature range trends on precipitation from 1950 to 2004. Clim. Dyn., doi: 10.1007/s00382-008-0387-5.4

Dai, A., 2008: Temperature and pressure dependence of the rain-snow phase transition over land and ocean. Geophys. Res. Lett., 35, L12802, doi: 10.1029/2008GL033295.1

Tian, X., Z. Xie, A. Dai, 2008: A land surface soil moisture data assimilation system based on the dual-UKF method and the Community Land Model. J. Geophys. Res., 113, D14127, doi: 10.1029/2007JD009650.3

Wang, J., L. Zhang, A. Dai, T. VanHove, J. Van Baelen, 2007: A near-global, 2-hourly data set of atmospheric precipitable water from ground-based GPS measurements. J. Geophys. Res., 112, D11107, doi: 10.1029/2006JD007529.3

Sun, Y., S. Solomon, A. Dai, R. Portmann, 2007: How often will it rain? J. Climate, 20, 4801-4818, doi: 10.1175/JCLI4263.1.3