NDLI: Simulation and improvement of land surface processes in Nameqie, Central Tibetan Plateau, using the Community Land Model (CLM3.5)

Content Provider	Springer Nature Link
Author	Wang, Xuejia Yang, Meixue Pang, Guojin Wan, Guoning Chen, Xiaolei
Copyright Year	2014
Abstract	Accurate simulation of thermal and hydrological soil processes is highly important for studying cold region climates. In this paper, two thermal conductivity parameterization schemes for soil proposed by Johansen and Luo were combined with a groundwater parameterization scheme (JN and LN schemes) to modify the soil water and heat parameterization schemes in the Community Land Model (CLM3.5). Land surface processes in the Central Tibetan Plateau were simulated based on the original scheme (Farouki scheme), JN scheme, and LN scheme using the atmospheric forces from meteorological observations at Nameqie, and they were compared with observed data in the same period. We found that all three schemes underestimated the upward shortwave radiation and overestimated the upward longwave radiation and net radiation, but the predictions from the modified scheme better agreed with the observations. The three schemes simulated the average soil temperatures higher than the observation data. The modified schemes, particularly the LN scheme, resulted in better predictions of the soil temperature compared with the original CLM3.5. More thawing days were simulated by three schemes. The observed freezing and thawing proceeded from the upper layers to the lower layers; however, the frozen soil in the Farouki and LN schemes began to thaw in the upper layers and below ~160 cm. The differences in the simulated soil thermal conductivity among the three schemes increased with depth. The soil thermal conductivity simulated by the Farouki scheme was the highest, while the smallest values were generated by the JN scheme. The soil volumetric water content of the Farouki scheme below a 100 cm depth was obviously larger than the observed data. After considering water exchange between the soil column and its underlying aquifer, the JN scheme and, particularly, the LN scheme, simulated the soil volumetric water content slightly higher than but similarly to the observed data.
Starting Page	7343
Ending Page	7357
Page Count	15
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	11
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-12-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Community Land Model Land surface process Soil thermal conductivity Soil temperature Freeze/thaw Soil volumetric water content Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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