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Evaluation of SHAW Model in Simulating Energy Balance, Leaf Temperature, and Micrometeorological Variables within a Maize Canopy

^a Dep. of Environmental Sciences, Nanjing Univ. of Information Science & Technology, Nanjing 210044, China
^b Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
^c USDA-ARS, Northwest Watershed Research Center, 800 Park Blvd., Suite 105, Boise, ID 83712

View larger version (20K): [in a new window]   Fig. 1. Simulated vs. measured values for air temperature, relative humidity, and wind speed in each canopy layer from 3 to 5 August (Day 215–217) of 1999 after Simultaneous Heat and Water (SHAW) model modification for wind speed within the canopy. RH = relative humidity.

View larger version (39K): [in a new window]   Fig. 2. Simulated vs. measured net radiation (Rn), latent heat flux (LvE), sensible heat flux (Hs), and ground heat flux (G) from 15 June to 9 October (Day 166–282) of 2003 (All fluxes are in W m–2 and assumed positive toward the surface).

View larger version (26K): [in a new window]   Fig. 3. The difference of net radiation and ground heat flux vs. the sum of latent and sensible heat flux from 15 June to 9 October (Day 166–282) of 2003 (all fluxes are in W m–2 and assumed positive toward the surface).

View larger version (27K): [in a new window]   Fig. 4. Measured and simulated net radiation (Rn), latent heat flux (LvE), sensible heat flux (Hs), and ground heat flux (G) for a maize canopy in Yucheng from 15 to 30 August of 2003 (Day 227–242). (Precipitation, P, is in mm; all energy fluxes are in W m–2 and assumed positive toward the surface).

View larger version (31K): [in a new window]   Fig. 5. Simulated vs. measured radiometric surface temperature from 6 July to 9 October (Day 187–282) of 2003.

View larger version (26K): [in a new window]   Fig. 6. Simulated vs. measured leaf temperatures in different layers on clear days from 17 August to 17 September (Day 229–260) of 2003.

View larger version (26K): [in a new window]   Fig. 7. Profile of temperatures from canopy top to underlying soil from 9 to 14 September (Day 252 through 257) of 2003 (––––, simulated values; ......, measured values).