Parameterization of sub-grid scale processes in climate models

A. J. Pitman

Parameterization of sub-grid scale processes in climate models

A. J. Pitman^*

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution

Abstract

Three methods of increasing sub-grid scale heterogeneity in the representation of the land surface in AGCMs are described: a method of spatial aggregation of parameter data to AGCM resolution which retains the original variability in the data in subsequent climate simulations; a parameterization of sub-grid scale precipitation, interception and runoff; and an attempt at a model of sub-grid scale lakes for climate models. The relative sensitivity of the land surface to these modifications is discussed. It is shown that the aggregation of data is likely to improve simulations while incorporating the precipitation or lake parameterizations will improve the level of realism in the land surface models, but may not improve the climate simulations.

Original language	English
Title of host publication	Hydrological Interactions Between Atmosphere, Soil and Vegetation
Publisher	Publ by IAHS
Pages	65-74
Number of pages	10
Edition	204
ISBN (Print)	0947571132
Publication status	Published - 1991
Event	20th General Assembly of the International Union of Geodesy and Geophysics - Vienna, Austria Duration: 11 Aug 1991 → 24 Aug 1991

Other

Other	20th General Assembly of the International Union of Geodesy and Geophysics
City	Vienna, Austria
Period	11/08/91 → 24/08/91

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abstract = "Three methods of increasing sub-grid scale heterogeneity in the representation of the land surface in AGCMs are described: a method of spatial aggregation of parameter data to AGCM resolution which retains the original variability in the data in subsequent climate simulations; a parameterization of sub-grid scale precipitation, interception and runoff; and an attempt at a model of sub-grid scale lakes for climate models. The relative sensitivity of the land surface to these modifications is discussed. It is shown that the aggregation of data is likely to improve simulations while incorporating the precipitation or lake parameterizations will improve the level of realism in the land surface models, but may not improve the climate simulations.",

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AB - Three methods of increasing sub-grid scale heterogeneity in the representation of the land surface in AGCMs are described: a method of spatial aggregation of parameter data to AGCM resolution which retains the original variability in the data in subsequent climate simulations; a parameterization of sub-grid scale precipitation, interception and runoff; and an attempt at a model of sub-grid scale lakes for climate models. The relative sensitivity of the land surface to these modifications is discussed. It is shown that the aggregation of data is likely to improve simulations while incorporating the precipitation or lake parameterizations will improve the level of realism in the land surface models, but may not improve the climate simulations.

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M3 - Conference proceeding contribution

SN - 0947571132

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EP - 74

BT - Hydrological Interactions Between Atmosphere, Soil and Vegetation

PB - Publ by IAHS

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