A simple TOPMODEL-based runoff parameterization (SIMTOP) for use in global climate models

Guo-Yue Niu, Zong Liang Yang, Robert E. Dickinson, Lindsey E. Gulden

Research output: Contribution to journalArticle

231 Citations (Scopus)

Abstract

This paper develops a simple TOPMODEL-based runoff parameterization (hereinafter SIMTOP) for use in global climate models (GCMs) that improves the runoff production and the partitioning of runoff between surface and subsurface components. SIMTOP simplifies the TOPMODEL runoff formulations in two ways: (1) SIMTOP represents the discrete distribution of the topographic index as an exponential function, not as a three-parameter gamma distribution; this change improves the parameterization of the fractional saturated area, especially in mountainous regions. (2) SIMTOP treats subsurface runoff as a product of an exponential function of the water table depth and a single coefficient, not as a product of several parameters that depend on topography and soil properties; this change facilitates applying TOPMODEL-based runoff schemes on global scale. SIMTOP is incorporated into the National Center for Atmospheric Research (NCAR) Community Land Model version 2.0 (CLM 2.0). SIMTOP is validated at a watershed scale using data from the Sleepers River watershed in Vermont, USA. It is also validated on a global scale using the monthly runoff data from the University of New Hampshire Global Runoff Data Center (UNH-GRDC). SIMTOP performs favorably when compared to the baseline runoff formulation used in CLM2.0. Realistic simulations can be obtained using two distinct saturated hydraulic conductivity (Ksat) profiles. These profiles include (1) exponential decay of Ksat with depth (as is typically done in TOPMODEL-based runoff schemes) and (2) the definition of Ksat using the soil texture profile data (as is typically done in climate models) and the concordant reduction of the gravitational drainage from the bottom of the soil column.

Original languageEnglish (US)
Article numberD21106
Pages (from-to)1-15
Number of pages15
JournalJournal of Geophysical Research: Space Physics
Volume110
Issue number21
DOIs
StatePublished - Nov 16 2005
Externally publishedYes

Fingerprint

Climate models
climate models
Parameterization
drainage
Runoff
parameterization
global climate
climate modeling
runoff
soils
Exponential functions
exponential functions
Watersheds
Soils
profiles
watershed
water tables
formulations

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

A simple TOPMODEL-based runoff parameterization (SIMTOP) for use in global climate models. / Niu, Guo-Yue; Yang, Zong Liang; Dickinson, Robert E.; Gulden, Lindsey E.

In: Journal of Geophysical Research: Space Physics, Vol. 110, No. 21, D21106, 16.11.2005, p. 1-15.

Research output: Contribution to journalArticle

Niu, Guo-Yue ; Yang, Zong Liang ; Dickinson, Robert E. ; Gulden, Lindsey E. / A simple TOPMODEL-based runoff parameterization (SIMTOP) for use in global climate models. In: Journal of Geophysical Research: Space Physics. 2005 ; Vol. 110, No. 21. pp. 1-15.
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