• 5 Citations

Abstract

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.
Original languageEnglish
Pages (from-to)5735-5755
JournalWater resources research
Volume51
Issue number7
DOIs
StatePublished - 2015

Fingerprint

soil moisture
water uptake
turbulence
canopy
parameterization
latent heat flux
sensible heat flux
water stress
meadow
soil water
soil water potential
soil column
soil temperature
land surface
plateau
hydraulics
ecosystem
temperature

Keywords

  • IR-101233
  • METIS-311342
  • ITC-ISI-JOURNAL-ARTICLE

Cite this

Zheng, Donghai; van der Velde, Rogier; Su, Zhongbo; Wen, Jun; Booij, Martijn J.; Hoekstra, Arjen Ysbert; Wang, Xin / Under-canopy turbulence and root water uptake of a Tibetan meadow ecosystem modeled by Noah-MP.

In: Water resources research, Vol. 51, No. 7, 2015, p. 5735-5755.

Research output: Scientific - peer-reviewArticle

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title = "Under-canopy turbulence and root water uptake of a Tibetan meadow ecosystem modeled by Noah-MP",
abstract = "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.",
keywords = "IR-101233, METIS-311342, ITC-ISI-JOURNAL-ARTICLE",
author = "Donghai Zheng and {van der Velde}, Rogier and Zhongbo Su and Jun Wen and Booij, {Martijn J.} and Hoekstra, {Arjen Ysbert} and Xin Wang",
year = "2015",
doi = "10.1002/2015WR017115",
volume = "51",
pages = "5735--5755",
journal = "Water resources research",
issn = "0043-1397",
publisher = "Wiley-Blackwell",
number = "7",

}

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: Scientific - peer-reviewArticle

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 -