DOI: 10.1002/joc.3370020202. A study of the influence of surface albedo on July circulation in semi‐arid regions using the glas GCM

A study of the influence of surface albedo on July circulation in semi‐arid regions using the glas GCM

10.1002/joc.3370020202

Crossref journal-article

Wiley

Journal of Climatology (311)

Abstract

AbstractA numerical simulation study of the influence of surface albedo on July circulation in semi‐arid regions, using the general circulation model (GCM) of the Goddard Laboratory of Atmospheric Sciences (GLAS) is presented. The results are based on two 47‐day integrations. In the first integration, called the control run, the surface albedo was normally prescribed, whereas in the second integration, called the anomaly run, the surface albedo was modified in four regions: the Sahel in Africa, the western Great Plains in the United States, the Thar Desert border in the Indian subcontinent, and northeast Brazil in South America. This experiment is similar to that of Charneyet al.(1977); however, it was performed with the GLAS model with vastly different boundary forcings and several changes in the physical parameterizations.Each run was started from observed initial conditions for 15 June 1979, based on NMC analysis. An analysis of the two simulations shows that in the Sahel, and the Thar Desert border regions the current results again show reduced precipitation with increased surface albedo in accordance with Charneyet al.(1977) and Charney (1975). The semi‐arid northeast Brazil region, which had a winter circulation, also conforms with Charney's (1975) hypothesis. However, the Great Plains region was an exception. There the total precipitation in two simulations was unchanged, as was the total cloudiness. In this region, the convective precipitation was reduced somewhat, while the large‐scale precipitation compensated this decrease by approximately the same amount. The lack of albedo impact on precipitation in the Great Plains region could be due to the influence of the Rocky Mountains in generating variations in the large‐scale flow.The purpose of repeating Charney's albedo experiment was to test the sensitivity of his earlier results with the current GLAS GCM which has substantially modified physical parameterizations, particularly the planetary boundary layer (PBL), crucially important for such impact studies. Taking into account that both the GCM and the initial conditions of the atmosphere were different, it is worth noting that this experiment still provides support for Charney's hypothesis (1975) regarding the influence of surface albedo on mean‐monthly climatology in the subtropical desert margin regions.Another important influence noted was the variability of mean monthly simulation in areas far away from the albedo anomaly regions. Because the differences occur in regions of high observed climatological variability, it is necessary to separate the contribution of albedo anomalies as opposed to the model variability. The influence of surface albedo changes to produce large changes in the mean montly circulation elsewhere is very intriguing and needs further investigation.

Bibliography

Sud, Y. C., & Fennessy, M. (1982). A study of the influence of surface albedo on July circulation in semiâarid regions using the glas GCM. Journal of Climatology, 2(2), 105â125. Portico.

Authors 2

Y. C. Sud (first)
M. Fennessy (additional)

References 22 Referenced 132

10.1175/1520-0450(1976)015<1139:TEOVSA>2.0.CO;2
{'volume-title': 'Monthly Sea Ice Charts', 'year': '1977', 'author': 'British Meteorological Office', 'key': 'e_1_2_1_3_1'} / Monthly Sea Ice Charts by British Meteorological Office (1977)
10.1002/qj.49710142802
10.1175/1520-0469(1977)034<1366:ACSOTE>2.0.CO;2
Godbole R. V.andShukla J.1981. ‘Global analysis of July and January sea‐level pressure’ NASA Tech. Memo. 82097.
{'key': 'e_1_2_1_7_1', 'series-title': 'GARP Publ. Series No. 22', 'first-page': '207', 'volume-title': 'Comparisons of observed seasonal climate features with a winter and summer numerical simulation produced with the GLAS general circulation model', 'author': 'Halem M.', 'year': '1979'} / Comparisons of observed seasonal climate features with a winter and summer numerical simulation produced with the GLAS general circulation model / GARP Publ. Series No. 22 by Halem M. (1979)
Hummel J. R.andReck R. A.1978. ‘A global surface albedo model’ Research Publication GMR‐2607 Physics Department General Motors Research Laboratories Warren MI 48090. (Submitted for publication inJ. Appl. Meteor.)
10.1175/1520-0450(1978)017<0560:COEOVS>2.0.CO;2
10.1038/289451a0
10.1175/1520-0493(1979)107<0395:CROEFE>2.0.CO;2
10.1175/1520-0450(1979)018<1252:AIOSAV>2.0.CO;2
10.22201/igeof.2954436xe.1964.4.1.1654 / Geofisica Internacional / Global distribution of normal surface albedos by Posey J. W. (1964)
10.1175/1520-0493(1980)108<0267:TSCOSC>2.0.CO;2
10.1126/science.215.4539.1498
Shukla J. Randall D. A. Straus D. M. Sud Y.andMarx L.1981. ‘Winter and summer simulations with a GLAS general circulation model’ NASA Tech. Memo. 83866;Presented at theFirst Conference on Climate Variations of the Amer. Met. Soc. Jan. 19–23 San Diego Calif.
Sud Y.andAbeles J.1980. ‘A non‐iterative calculation for the surface temperature and surface fluxes in the GLAS GCM’ NASA Tech. Memo. 80650.
Sud Y. Kirshnamurthy V.andMarx L.1981. ‘A documentation of the GLAS general circulation model’ Climate Modeling Group Goddard Modeling and Simulation Facility NASA/Goddard Space Flight Center Greenbelt MD 20771 (in preparation).
10.1002/qj.49710343503
Wu M. L.1976. ‘Longwave radiation and its effect on the atmosphere’ PhD. Thesis The University of Chicago 160pp.
10.1029/JC085iC07p04084
Wu M. L. Kaplan L. D.andGodbole R.1978. ‘Influence of systematic radiation differences on the dynamics of a model atmosphere’ Third Conf. on Atmos. Rod. of the Amer. Meteor. Soc. June 28–30 1978 Davis CA.
Zwally H. J. Comiso J. C. Parkinson C. L. Campbell W. J. Carsey F.andGloersen P.1981. ‘Antarctic sea‐ice cover 1973–76 from satellite passive microwave’ (to be published).

Dates

Type	When
Created	18 years, 7 months ago (Feb. 5, 2007, 6:44 p.m.)
Deposited	7 months, 3 weeks ago (Jan. 13, 2025, 10:16 a.m.)
Indexed	1 month, 3 weeks ago (July 12, 2025, 6:52 p.m.)
Issued	43 years, 5 months ago (April 1, 1982)
Published	43 years, 5 months ago (April 1, 1982)
Published Online	18 years, 9 months ago (Nov. 28, 2006)
Published Print	43 years, 5 months ago (April 1, 1982)

Funders 0

None

BibTeX

@article{Sud_1982, title={A study of the influence of surface albedo on July circulation in semi‐arid regions using the glas GCM}, volume={2}, ISSN={0196-1748}, url={http://dx.doi.org/10.1002/joc.3370020202}, DOI={10.1002/joc.3370020202}, number={2}, journal={Journal of Climatology}, publisher={Wiley}, author={Sud, Y. C. and Fennessy, M.}, year={1982}, month=apr, pages={105–125} }

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