Abstract
| Language | English |
|---|---|
| Pages | 5735-5755 |
| Journal | Water resources research |
| Volume | 51 |
| Issue number | 7 |
| DOIs | |
| State | Published - 2015 |
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Keywords
- IR-101233
- METIS-311342
- ITC-ISI-JOURNAL-ARTICLE
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Under-canopy turbulence and root water uptake of a Tibetan meadow ecosystem modeled by Noah-MP. / Zheng, Donghai; van der Velde, Rogier; Su, Zhongbo; Wen, Jun; Booij, Martijn J.; Hoekstra, Arjen Ysbert; Wang, Xin.
In: Water resources research, Vol. 51, No. 7, 2015, p. 5735-5755.Research output: Contribution to journal › Article
TY - JOUR
T1 - Under-canopy turbulence and root water uptake of a Tibetan meadow ecosystem modeled by Noah-MP
AU - Zheng,Donghai
AU - van der Velde,Rogier
AU - Su,Zhongbo
AU - Wen,Jun
AU - Booij,Martijn J.
AU - Hoekstra,Arjen Ysbert
AU - Wang,Xin
PY - 2015
Y1 - 2015
N2 - The Noah-MP land surface model adopts a multiparameterization framework to accommodate various alternative parameterizations for more than 10 physical processes. In this paper, the parameterizations implemented in Noah-MP associated with under-canopy turbulence and root water uptake are enhanced with: (i) an under-canopy turbulence scheme currently adopted by the Community Land Model (CLM), (ii) two vertical root distribution functions, i.e., an exponential and an asymptotic formulation, and (iii) three soil water stress functions (βt) controlling root water uptake, e.g., a soil water potential (ψ)-based function, a nonlinear soil moisture (θ)-based power function and an empirical threshold approach considering preferential uptake from the moist part of the soil column. A comprehensive data set of in situ micrometeorological observations and profile soil moisture/temperature measurements collected from an alpine meadow site in the northeastern Tibetan Plateau is utilized to assess the impact of the augmentations on the Noah-MP performance. The results indicate that (i) implementation of the CLM under-canopy turbulence scheme greatly resolves the overestimation of sensible heat flux and underestimation of soil temperature across the profile, (ii) both exponential and asymptotic vertical root distribution functions better represent the Tibetan conditions enabling a better representation of the measured soil moisture dynamics, and (iii) the ψ-based βt functions overestimate surface soil moisture, the default linear θ-based βt function underestimates latent heat flux during the dry-down, while both the nonlinear power function and empirical threshold approach simultaneously simulate well soil moisture, and latent and sensible heat fluxes. Additionally, the parameter uncertainty associated with soil water stress function and hydraulic parameterization is addressed.
AB - The Noah-MP land surface model adopts a multiparameterization framework to accommodate various alternative parameterizations for more than 10 physical processes. In this paper, the parameterizations implemented in Noah-MP associated with under-canopy turbulence and root water uptake are enhanced with: (i) an under-canopy turbulence scheme currently adopted by the Community Land Model (CLM), (ii) two vertical root distribution functions, i.e., an exponential and an asymptotic formulation, and (iii) three soil water stress functions (βt) controlling root water uptake, e.g., a soil water potential (ψ)-based function, a nonlinear soil moisture (θ)-based power function and an empirical threshold approach considering preferential uptake from the moist part of the soil column. A comprehensive data set of in situ micrometeorological observations and profile soil moisture/temperature measurements collected from an alpine meadow site in the northeastern Tibetan Plateau is utilized to assess the impact of the augmentations on the Noah-MP performance. The results indicate that (i) implementation of the CLM under-canopy turbulence scheme greatly resolves the overestimation of sensible heat flux and underestimation of soil temperature across the profile, (ii) both exponential and asymptotic vertical root distribution functions better represent the Tibetan conditions enabling a better representation of the measured soil moisture dynamics, and (iii) the ψ-based βt functions overestimate surface soil moisture, the default linear θ-based βt function underestimates latent heat flux during the dry-down, while both the nonlinear power function and empirical threshold approach simultaneously simulate well soil moisture, and latent and sensible heat fluxes. Additionally, the parameter uncertainty associated with soil water stress function and hydraulic parameterization is addressed.
KW - IR-101233
KW - METIS-311342
KW - ITC-ISI-JOURNAL-ARTICLE
UR - https://ezproxy2.utwente.nl/login?url=http://dx.doi.org/10.1002/2015WR017115
UR - https://ezproxy2.utwente.nl/login?url=https://webapps.itc.utwente.nl/library/2015/isi/zheng_und.pdf
U2 - 10.1002/2015WR017115
DO - 10.1002/2015WR017115
M3 - Article
VL - 51
SP - 5735
EP - 5755
JO - Water resources research
T2 - Water resources research
JF - Water resources research
SN - 0043-1397
IS - 7
ER -