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Home » Staff Profiles
Siwei He
Research Scientist
325 Broadway
Boulder, CO 80305-3328



Siwei He
Research Scientist I at CIRES


My research mainly focuses on the land surface modeling, especially on the subgrid processes and snow processes. I have developed a stochastic subgrid snow model, the FPE snow model (, for representing subgrid variability of snow in land surface and hydrological models. I also developed a scale-aware parameterization for estimating subgrid variability of downward shortwave radiation (, which could be potentially used to estimate subgrid variability of the radiation-driven variables. I am also interested in hydrological modeling, land-atmosphere interactions, and stochastic modeling. 

Research Interests

  • Hydrological and land surface modeling
  • Subgrid variability in numerical modeling (scale-aware parameterization)
  • Land-atmosphere interactions
  • Hydrology (snow, surface and subsurface hydrology, and post-wildfire impacts)


  • PhD, Hydrology, University of Wyoming, 2018
  • M.E., Hydrology and Water Resources, Sichuan University, 2013
  • B.E., hydraulics and Hydro-power, Xi’an University of Technology, 2010   


  • Mar 2020 - present, Research Scientist, Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder
  • Aug 2018 - Feb 2020, NRC Research Associate, NOAA/ESRL/GSL
  • Sep 2014 - May 2018, Graduate Research Assistant, University of Wyoming, Laramie, US
  • Feb 2018 - May 2018, Graduate Teaching Assistant, University of Wyoming, Laramie, US
  • Jun 2017 - Jul 2017, Summer Institute Student Research Fellow, NOAA National Water Center, Tuscaloosa, US
  • Jul 2013 - Jul 2014, Internship, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, China


Ohara, Noriaki, Siwei He, Andrew D Parsekian, Benjamin M Jones, Rodrigo C Rangel, Ian O Nichols, and Kenneth M Hinkel, (2022). Spatial Snowdrift Modeling for an Open Natural Terrain using a Physically- based Linear Particle Distribution Equation. Hydrological Processes 36(1), e14468.

He, Siwei, Tatiana G Smirnova, and Stanley G Benjamin, (2021). Single-Column Validation of a Snow Subgrid Parameterization in the Rapid Update Cycle Land-Surface Model (RUC LSM). Water Resources Research 57(8), e2021WR029955.

He, Siwei, Tatiana G Smirnova, and Stanley G Benjamin, (2019). A scale‐aware parameterization for estimating subgrid variability of downward solar radiation using high‐resolution digital elevation model data. Journal of Geophysical Research: Atmospheres, 2019; 124: 13680– 13692.

He, Siwei and Noriaki Ohara, (2019). Modeling subgrid variability of snow depth using the Fokker‐Planck equation approach. Water Resources Research, 55, 3137– 3155.

He, Siwei, Noriaki Ohara, and Scott N Miller, (2019). Understanding subgrid variability of snow depth at 1‐km scale using Lidar measurements. Hydrological Processes, 33: 1525– 1537.

He, Siwei and Noriaki Ohara, (2017). A new formula for estimating the threshold wind speed for snow movement. Journal of Advances in Modeling Earth Systems, 9, 2514– 2525.