DOI: 10.1029/2000jd900508. Understanding the Indian Ocean Experiment (INDOEX) aerosol distributions with an aerosol assimilation

Understanding the Indian Ocean Experiment (INDOEX) aerosol distributions with an aerosol assimilation

10.1029/2000jd900508

Crossref journal-article

American Geophysical Union (AGU)

Journal of Geophysical Research: Atmospheres (13)

Abstract

We use the aerosol assimilation procedure described by Collins et al. [2000] to help explain INDOEX aerosol distributions. The procedure combines modeled aerosol with AVHRR satellite estimates. The result is consistent with satellite measurements, regular in space and time, and provides information where retrievals are difficult (over land, coincident with clouds, and at night). Extra information on aerosol composition, vertical distribution, and region of origin is also produced. Carbonaceous, sulfate, and sea salt aerosols agree with the in situ measurements to 10–20%. Carbonaceous aerosols were estimated to be the dominant contributor (36%) to the aerosol optical depth (AOD); dust (31%) and sulfate (26%) were also important. The residence time for sulfate and carbon is ∼7 and ∼8 days respectively, longer than globally averaged residence times of many modeling studies. Thus aerosols produced here during the winter monsoon may have a larger climate impact than the same emissions occurring where the residence time is shorter. Three points of entry are found for anthropogenic aerosol to the INDOEX region: a strong near surface southward flow near Bombay; a deeper plume flowing south and east off Calcutta and a westward flow originating from southeast Asia and entering the Bay of Bengal. All three plumes are strongly modulated by a low‐frequency change of meteorological regime associated with the Madden Julian Oscillation. The analysis suggests that India is the dominant source of aerosol in the Arabian Sea and Bay of Bengal near the surface but that Asia, Africa and the rest of world also contribute at higher altitudes. India and Asia contribute ∼40% each to the total column mass of air reaching the Maldives, the balance of air comes from other source regions. The assimilation procedure produces an analysis that is a synergy in information about aerosols, that is not easily accessible by independent estimates from remote sensing, in situ measurements, or global transport models by themselves.

Bibliography

Rasch, P. J., Collins, W. D., & Eaton, B. E. (2001). Understanding the Indian Ocean Experiment (INDOEX) aerosol distributions with an aerosol assimilation. Journal of Geophysical Research: Atmospheres, 106(D7), 7337â7355. Portico.

Authors 3

Philip J. Rasch (first)
William D. Collins (additional)
Brian E. Eaton (additional)

References 28 Referenced 158

10.1126/science.245.4923.1227
10.1126/science.276.5315.1052
10.1029/1999JD900773
10.1111/j.1749-6632.1980.tb17130.x
Caplan P. H.‐L.Pan Changes to the 1999 NCEP Operational MRF Model Analysis/Forecast System Publ. 452 20 Environ. Model. Cent. Natl. Cent. for Environ. Prediction Silver Spring Md. 1999.
10.1126/science.255.5043.423
10.1029/2000JD900507
10.1029/96JD01818
Derber J. H.‐L.Pan P.Caplan G.White M.Iredell Y.‐T.Hou K.Campana S.Moorthi Changes to the 1998 NCEP Operational MRF Model Analysis/Forecast System Publ. 449 20 Environ. Model. Cent. Natl. Cent. for Environ. Pred. Silver Spring Md. 1998.
10.1029/93JD00466
10.1029/JD094iD04p05029
10.1034/j.1600-0889.2000.01146.x
{'key': 'e_1_2_1_14_1', 'volume-title': 'Climate Change, 1995: The Science of Climate Change', 'author': 'Intergovernment Panel on Climate Change', 'year': '1996'} / Climate Change, 1995: The Science of Climate Change by Intergovernment Panel on Climate Change (1996)
10.1175/1520-0477(1999)080<2229:RSOTAF>2.0.CO;2
10.1175/1520-0493(1987)115<1407:DAOCLC>2.0.CO;2
10.1007/BF01029690
10.1175/1520-0450(1967)006<0791:EEOSLP>2.0.CO;2
10.1175/1520-0469(1971)028<0702:DOADOI>2.0.CO;2
10.1175/1520-0469(1972)029<1109:DOGSCC>2.0.CO;2 / J. Atmos. Sci. / Description of global‐scale circulation cells in the tropics wath a 40–50 day period by Madden R. (1972)
10.1029/PA005i001p00001
McNally A. P. J. C.Derber W. S.Wu B. B.Katz Further changes to the 1997 NCEP Operational MRF Model Analysis/ Forecast System: The use of TOVS level 1‐b radiances and increased vertical diffusion Publ. 445 20 Environ. Model. Cent. Natl. Cent. for Environ. Prediction Silver Spring Md. 1997.
10.1029/97JD02087
10.1029/1999JD900777
10.1034/j.1600-0889.2000.00980.x
10.1175/1520-0442(1997)010<2299:SASRII>2.0.CO;2
10.1029/97JD01864
10.1016/0004-6981(74)90004-3
Wu W.‐S. M.Iredell S.Saha P.Caplan Changes to the 1997 NCEP Operational MRF Model Analysis/Forecast System Publ. 443 20 Environ. Model. Cent. Natl. Cent. for Environ. Prediction Silver Spring Md. 1997.

Dates

Type	When
Created	21 years, 6 months ago (Feb. 3, 2004, 8:14 p.m.)
Deposited	1 year, 11 months ago (Sept. 22, 2023, 10:48 p.m.)
Indexed	1 week, 6 days ago (Aug. 12, 2025, 5:27 p.m.)
Issued	24 years, 4 months ago (April 1, 2001)
Published	24 years, 4 months ago (April 1, 2001)
Published Online	24 years, 4 months ago (April 1, 2001)
Published Print	24 years, 4 months ago (April 16, 2001)

Funders 0

None

BibTeX

@article{Rasch_2001, title={Understanding the Indian Ocean Experiment (INDOEX) aerosol distributions with an aerosol assimilation}, volume={106}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/2000jd900508}, DOI={10.1029/2000jd900508}, number={D7}, journal={Journal of Geophysical Research: Atmospheres}, publisher={American Geophysical Union (AGU)}, author={Rasch, Philip J. and Collins, William D. and Eaton, Brian E.}, year={2001}, month=apr, pages={7337–7355} }

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