The Interplay between Transpiration and Runoff Formulations in Land Surface Schemes Used with Atmospheric ModelsSource: Journal of Climate:;1997:;volume( 010 ):;issue: 007::page 1578DOI: 10.1175/1520-0442(1997)010<1578:TIBTAR>2.0.CO;2Publisher: American Meteorological Society
Abstract: The Project for Intercomparison of Land-surface Parameterization Schemes (PILPS) has shown that different land surface models (LSMs) driven by the same meteorological forcing can produce markedly different surface energy and water budgets, even when certain critical aspects of the LSMs (vegetation cover, albedo, turbulent drag coefficient, and snowcover) are carefully controlled. To help explain these differences, the authors devised a monthly water balance model that successfully reproduces the annual and seasonal water balances of the different PILPS schemes. Analysis of this model leads to the identification of two quantities that characterize an LSM?s formulation of soil water balance dynamics: 1) the efficiency of the soil?s evaporation sink integrated over the active soil moisture range, and 2) the fraction of this range over which runoff is generated. Regardless of the LSM?s complexity, the combination of these two derived parameters with rates of interception loss, potential evaporation, and precipitation provides a reasonable estimate for the LSM?s simulated annual water balance. The two derived parameters shed light on how evaporation and runoff formulations interact in an LSM, and the analysis as a whole underscores the need for compatibility in these formulations.
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contributor author | Koster, Randal D. | |
contributor author | Milly, P. C. D. | |
date accessioned | 2017-06-09T15:35:38Z | |
date available | 2017-06-09T15:35:38Z | |
date copyright | 1997/07/01 | |
date issued | 1997 | |
identifier issn | 0894-8755 | |
identifier other | ams-4803.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4187323 | |
description abstract | The Project for Intercomparison of Land-surface Parameterization Schemes (PILPS) has shown that different land surface models (LSMs) driven by the same meteorological forcing can produce markedly different surface energy and water budgets, even when certain critical aspects of the LSMs (vegetation cover, albedo, turbulent drag coefficient, and snowcover) are carefully controlled. To help explain these differences, the authors devised a monthly water balance model that successfully reproduces the annual and seasonal water balances of the different PILPS schemes. Analysis of this model leads to the identification of two quantities that characterize an LSM?s formulation of soil water balance dynamics: 1) the efficiency of the soil?s evaporation sink integrated over the active soil moisture range, and 2) the fraction of this range over which runoff is generated. Regardless of the LSM?s complexity, the combination of these two derived parameters with rates of interception loss, potential evaporation, and precipitation provides a reasonable estimate for the LSM?s simulated annual water balance. The two derived parameters shed light on how evaporation and runoff formulations interact in an LSM, and the analysis as a whole underscores the need for compatibility in these formulations. | |
publisher | American Meteorological Society | |
title | The Interplay between Transpiration and Runoff Formulations in Land Surface Schemes Used with Atmospheric Models | |
type | Journal Paper | |
journal volume | 10 | |
journal issue | 7 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/1520-0442(1997)010<1578:TIBTAR>2.0.CO;2 | |
journal fristpage | 1578 | |
journal lastpage | 1591 | |
tree | Journal of Climate:;1997:;volume( 010 ):;issue: 007 | |
contenttype | Fulltext |