TY - JOUR
T1 - A land surface process/radiobrightness model with coupled heat and moisture transport in soil
AU - Liou, Yuei An
AU - England, Anthony W.
N1 - Funding Information:
Manuscript received February 9, 1996; revised April 25, 1997. This work was supported by NASA Grant NAGW-3430.
PY - 1998
Y1 - 1998
N2 - Heat and moisture transport in soil are coupled processes that jointly determine temperature and moisture profiles. We present a physically based, one-dimensional (1-D), coupled heat and moisture transport hydrology (1-DH) model for bare, unfrozen, moist soils subject to insolation, radiant heating and cooling, and sensible and latent heat exchanges with the atmosphere. A 60-day simulation is conducted to study the effect of dry-down on soil temperature and moisture distributions in summer for bare soil in the Midwest United States. Given a typical initial moisture content of 38% by volume, we find that temperature differences between the water transport and no water transport cases exhibit a diurnal oscillation with a slowly increasing amplitude, but never exceed 4.4 K for the 60day period. However, moisture content of the surface decreases significantly with time for the water transport case and becomes only about 21 % at the end of the same period. The 1-DH model is linked to a radiobrightness (1-DH/R) model as a potential means for soil moisture inversion. The model shows that radiobrightness thermal inertia (RTI) correlates with soil moisture if the two radiobrightnesses are taken from times near the thermal extremes, e.g., 2 a.m. and 2 p.m., and that RTI appears temperature-dependent at the ending stages of the drydown simulations where soils are dry and their moisture contents vary slowly. Near times of thermal crossover, the RTI technique is insensitive to soil moisture.
AB - Heat and moisture transport in soil are coupled processes that jointly determine temperature and moisture profiles. We present a physically based, one-dimensional (1-D), coupled heat and moisture transport hydrology (1-DH) model for bare, unfrozen, moist soils subject to insolation, radiant heating and cooling, and sensible and latent heat exchanges with the atmosphere. A 60-day simulation is conducted to study the effect of dry-down on soil temperature and moisture distributions in summer for bare soil in the Midwest United States. Given a typical initial moisture content of 38% by volume, we find that temperature differences between the water transport and no water transport cases exhibit a diurnal oscillation with a slowly increasing amplitude, but never exceed 4.4 K for the 60day period. However, moisture content of the surface decreases significantly with time for the water transport case and becomes only about 21 % at the end of the same period. The 1-DH model is linked to a radiobrightness (1-DH/R) model as a potential means for soil moisture inversion. The model shows that radiobrightness thermal inertia (RTI) correlates with soil moisture if the two radiobrightnesses are taken from times near the thermal extremes, e.g., 2 a.m. and 2 p.m., and that RTI appears temperature-dependent at the ending stages of the drydown simulations where soils are dry and their moisture contents vary slowly. Near times of thermal crossover, the RTI technique is insensitive to soil moisture.
UR - http://www.scopus.com/inward/record.url?scp=0031675582&partnerID=8YFLogxK
U2 - 10.1109/36.655336
DO - 10.1109/36.655336
M3 - 期刊論文
AN - SCOPUS:0031675582
SN - 0196-2892
VL - 36
SP - 273
EP - 286
JO - IEEE Transactions on Geoscience and Remote Sensing
JF - IEEE Transactions on Geoscience and Remote Sensing
IS - 1
ER -