Impact of vegetation and preferential source areas on global dust aerosol: Results from a model study

American Geophysical Union (AGU) - Tập 107 Số D21 - 2002
Ina Tegen1, Sandy P. Harrison1, Karen E. Kohfeld1, I. Colin Prentice1, Michael T. Coe2, Martin Heimann1
1Max Planck Institute for Biogeochemistry, Jena, Germany
2University of Madison Madison Wisconsin USA

Tóm tắt

We present a model of the dust cycle that successfully predicts dust emissions as determined by land surface properties, monthly vegetation and snow cover, and 6‐hourly surface wind speeds for the years 1982–1993. The model takes account of the role of dry lake beds as preferential source areas for dust emission. The occurrence of these preferential sources is determined by a water routing and storage model. The dust source scheme also explicitly takes into account the role of vegetation type as well as monthly vegetation cover. Dust transport is computed using assimilated winds for the years 1987–1990. Deposition of dust occurs through dry and wet deposition, where subcloud scavenging is calculated using assimilated precipitation fields. Comparison of simulated patterns of atmospheric dust loading with the Total Ozone Mapping Spectrometer satellite absorbing aerosol index shows that the model produces realistic results from daily to interannual timescales. The magnitude of dust deposition agrees well with sediment flux data from marine sites. Emission of submicron dust from preferential source areas are required for the computation of a realistic dust optical thickness. Sensitivity studies show that Asian dust source strengths are particularly sensitive to the seasonality of vegetation cover.

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Tài liệu tham khảo

10.1029/97JD00403

10.1029/98GL51811

Bagnold R. A., 1941, The Physics of Blown Sands and Desert Dunes

10.1029/1999GB900098

10.1126/science.278.5339.870

10.1038/17276

Claquin T., 2002, Radiative forcing of climate by ice‐age atmospheric dust, Clim. Dyn.

10.1029/98PA02131

10.1038/383495a0

10.1029/98JD00347

10.1029/2000JD900587

d'Almeida G. A., 1986, A model for Saharan dust transport, J. Geophys. Res., 91, 903

10.1006/jare.1997.0369

DKRZ Model User Support Group, 1992, ECHAM3—Atmospheric general circulation model, tech. rep.

Duce R. A., 1995, in Aerosol Forcing of Climate, 43

10.1029/91GB01778

10.1038/335426a0

10.1357/0022240963213484

Fitzpatrick E. A., 1980, Soils

10.1175/1520-0442(1996)009<0409:SCASMI>2.0.CO;2

10.1034/j.1600-0889.49.issue2.5.x

Genthon C., 1992, Simulations of desert dust and sea salt aerosols in Antarctica with a general circulation model of the atmosphere, Tellus, Ser. B, 44, 371, 10.3402/tellusb.v44i4.15464

10.1016/0004-6981(78)90322-0

Gillette D. A., 1999, A qualitative geophysical explanation for “hot spot” dust emitting source regions, Contrib. Atmos. Phys., 72, 67

10.1029/2000JD000053

10.1016/0967-0637(93)90114-I

10.1016/S0967-0637(00)00077-7

Harrison S. P., 1983, in Global Climates Since the Last Glacial Maximum, 468

10.1016/S0012-8252(01)00041-1

10.2307/2390165

Heimann M. The global atmospheric tracer model TM2 (model description and user manual) Tech. Rep. 10 47 pp. Deutsches Klimarechenzentrum Hamburg Germany 1995.

10.1029/96JD03680

10.1029/97GB02733

10.1126/science.218.4575.883

10.1016/0967-0645(93)90034-K

10.1029/1998JD200086

10.1029/96JD04009

10.1038/31203

Intergovernmental Panel on Climate Change, 2001, Climate Change 2001

10.1111/j.1365-3091.1982.tb01713.x

10.1111/j.1600-0889.1983.tb00023.x

10.1029/97GB03368

10.1016/0967-0637(96)00063-5

10.1029/JD095iD02p01909

Kaplan J. O. Geophysical applications of vegetation modeling Ph.D. thesis 113 pp. Dep. of Ecol. Lund Univ. Lund Sweden 2001.

10.1175/1520-0450(1968)007<0944:FSOAP>2.0.CO;2

10.1016/S0399-1784(98)80035-2

10.2343/geochemj.32.125

10.1016/S0967-0637(00)00025-X

10.1071/MF99057

Kempe S., 1996, in Particle Flux in the Ocean, 313

10.1175/1520-0477(1999)080<2229:RSOTAF>2.0.CO;2

10.1034/j.1600-0889.47.issue4.7.x

10.1016/S0012-8252(01)00042-3

10.1016/0967-0637(93)90131-L

10.1016/S0967-0637(98)00059-4

10.1016/0198-0149(92)90106-4

Legrand M., 1995, in Aerosol Forcing of Climate, 123

10.1029/95JD03426

Livingston I., 1996, Aeolian Geomorphology

10.1016/0031-0182(95)00060-Y

10.1029/1999JD900084

10.1029/95JD00690

10.1029/96JD02964

10.1038/353123b0

10.1175/1520-0450(1997)036<0868:TDASCO>2.0.CO;2

McTainsh G., 1987, Desert loess in northern Nigeria, Z. Geomorph., 31, 145, 10.1127/zfg/31/1987/145

10.1016/0169-555X(95)00106-F

Middleton N. J., 1984, Dust storms in Australia: Frequency, distribution and seasonality, Search, 15, 46

10.1002/joc.3370060207

10.1016/0198-0149(86)90005-1

10.1016/0004-6981(76)90136-0

F. Parungo 1995 Natl. Oceanic and Atmos. Admin. Silver Spring Md.

10.1038/343056a0

10.1016/0899-5362(91)90063-5

Petit‐Maire N., 1999, Natural variability of the Earth's environments: The last two climatic extremes (18000 ± 2000 and 8000 ± 1000 yrs BP), Compt. R. Acad. Sci., II A, 328, 273

Prospero J. M., 1996, in Particle Flux in the Ocean

Prospero J. M., 2002, Environmental characteristics of global sources of atmospheric soil dust derived from the NIMBUS‐7 TOMS absorbing aerosol product, Rev. Geophys., 10.1029/2000RG000095

10.1038/320735a0

Pye K., 1987, Aeolian Dust and Dust Deposits

10.1016/0198-0149(91)90078-T

10.1002/jpln.1998.3581610404

10.1016/S0967-0637(99)00008-4

10.1029/1999JD900033

10.1029/94JD03245

10.1175/1520-0450(1981)020<1483:ANFDSF>2.0.CO;2

10.1016/0198-0149(92)90071-Z

10.1130/SPE186-p87

10.1029/93JD00396

10.1038/381681a0

10.1175/1520-0477(1984)065<0004:CAFEDF>2.0.CO;2

10.1029/97JC01490

Street‐Perrott F. A., 1989, Global Lake‐Level Variations From 18,000 to 0 Years Ago: A Paleoclimatic Analysis, 10.2172/5609291

Street‐Perrott F. A., 1985, in Paleoclimate Analysis and Modeling, 291

10.1034/j.1600-0889.1992.t01-1-00005.x

10.1029/94JD01928

10.1029/95JD02051

10.1029/98JD02345

10.1038/380419a0

Thompson R. S., 1993, in Global Climates Since the Last Glacial Maximum, 468

10.1175/1520-0477(1988)069<1047:AEAIOG>2.0.CO;2

10.1029/JC088iC09p05343

10.1016/S0304-4203(09)90045-7

10.1016/0967-0637(93)90019-Y

10.1016/0198-0149(88)90066-0

10.1029/JB084iB09p04643

10.1002/(SICI)1096-9837(199607)21:7<607::AID-ESP660>3.0.CO;2-1

10.1139/e17-121

L. Zobler 1986 NASA Washington D.C.

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American Geophysical Union (AGU)

Tập 107 Số D21

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