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Surface fluxes of water vapour, momentum and CO{sub 2} over a savanna in Niger. A contribution to HAPEX-SAHEL

Conference:

Abstract

For large scale models such as Global Circulation Models (GCM) the lower boundary condition is often provided by a SVAT model (Soil-Vegetation-Atmosphere Transfer). A wide range of SVATs is in use nowadays, varying from models based on the simple big-leaf concept to complicated multiple source models. Obviously, a SVAT intended to provide the lower boundary condition in GCM`s needs to be able to describe a wide range of surface types, varying from completely vegetated to sparsely vegetated or completely bare surfaces. Especially sparse canopy surface types exhibit rather demanding features with respect to the exchange of momentum, water vapour, CO{sub 2} and heat between the surface and the atmosphere. In this paper attention is focused on a sparse canopy. We will compare SVAT model simulations with data collected in 1992 at a Savannah site, in the framework of the HAPEX-SAHEL project (a large-scale study of land atmosphere interactions in the semi-arid tropics). Two existing SVAT models are considered (Choudhury-Monteith and Deardorff). In a separate study these models have been tested. A combined model has been constructed, consisting of the `best` parts of the original SVAT`s. Some preliminary results will be presented. 4 figs., 14 refs., 1 appendix
Authors:
Verhoef, A; De Bruin, H A.R.; Krikke, R [1] 
  1. Dept. of Meteorology. Landbouwuniversiteit, Wageningen (Netherlands)
Publication Date:
Nov 01, 1995
Product Type:
Conference
Report Number:
CONF-9412115-
Reference Number:
SCA: 540220; PA: ECN-96:0E1248; EDB-96:108546; SN: 96001614594
Resource Relation:
Conference: International climate change research conference, Maastricht (Netherlands), 6-9 Dec 1994; Other Information: PBD: Nov 1995; Related Information: Is Part Of Climate change research. Evaluation and policy implications. Proceedings of the International Climate Change Research Conference; Zwerver, S.; Van Rompaey, R.S.A.R.; Kok, M.T.J.; Berk, M.M. [eds.]; PB: 704 p.; Studies in Environmental Science, v. 65A
Subject:
54 ENVIRONMENTAL SCIENCES; SAVANNAS; AIR-BIOSPHERE INTERACTIONS; GENERAL CIRCULATION MODELS; WATER VAPOR; HEAT FLUX; CARBON DIOXIDE; NIGER; CANOPIES; BOUNDARY CONDITIONS; SIMULATION
OSTI ID:
250296
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Other: CNN: Contract NWO 750.650.37; Contract EU EPOC-0024-C(CD); Contract EU EV5V-CT91-0033; ISBN 0-444-82143-0; TRN: NL96E1248
Availability:
distributed in the USA and Canada by Elsevier Science Publishing Co., Inc., P.O. Box 945, Madison Square Station, New York, NY 10160-0757 (United States)
Submitting Site:
ECN
Size:
pp. 411-416
Announcement Date:
Jan 18, 2004

Conference:

Citation Formats

Verhoef, A, De Bruin, H A.R., and Krikke, R. Surface fluxes of water vapour, momentum and CO{sub 2} over a savanna in Niger. A contribution to HAPEX-SAHEL. Netherlands: N. p., 1995. Web.
Verhoef, A, De Bruin, H A.R., & Krikke, R. Surface fluxes of water vapour, momentum and CO{sub 2} over a savanna in Niger. A contribution to HAPEX-SAHEL. Netherlands.
Verhoef, A, De Bruin, H A.R., and Krikke, R. 1995. "Surface fluxes of water vapour, momentum and CO{sub 2} over a savanna in Niger. A contribution to HAPEX-SAHEL." Netherlands.
@misc{etde_250296,
title = {Surface fluxes of water vapour, momentum and CO{sub 2} over a savanna in Niger. A contribution to HAPEX-SAHEL}
author = {Verhoef, A, De Bruin, H A.R., and Krikke, R}
abstractNote = {For large scale models such as Global Circulation Models (GCM) the lower boundary condition is often provided by a SVAT model (Soil-Vegetation-Atmosphere Transfer). A wide range of SVATs is in use nowadays, varying from models based on the simple big-leaf concept to complicated multiple source models. Obviously, a SVAT intended to provide the lower boundary condition in GCM`s needs to be able to describe a wide range of surface types, varying from completely vegetated to sparsely vegetated or completely bare surfaces. Especially sparse canopy surface types exhibit rather demanding features with respect to the exchange of momentum, water vapour, CO{sub 2} and heat between the surface and the atmosphere. In this paper attention is focused on a sparse canopy. We will compare SVAT model simulations with data collected in 1992 at a Savannah site, in the framework of the HAPEX-SAHEL project (a large-scale study of land atmosphere interactions in the semi-arid tropics). Two existing SVAT models are considered (Choudhury-Monteith and Deardorff). In a separate study these models have been tested. A combined model has been constructed, consisting of the `best` parts of the original SVAT`s. Some preliminary results will be presented. 4 figs., 14 refs., 1 appendix}
place = {Netherlands}
year = {1995}
month = {Nov}
}