Retrieval of vertical columns of sulfur dioxide from SCIAMACHY and OMI: Air mass factor algorithm development, validation, and error analysis

Journal of Geophysical Research Atmospheres

Volumn 114, Issue 22, 2009, Pages

  Lee, Chulkyu ^a   Martin, Randall V ^a,b   Van Donkelaar, Aaron ^a   O'Byrne, Gray ^a   Krotkov, Nickolay ^c   Richter, Andreas ^d   Huey, L Gregory ^e   Holloway, John S ^f,g  

^a DALHOUSIE UNIVERSITY   (Canada)

^b HARVARD SMITHSONIAN CENTER FOR ASTROPHYSICS   (United States)

^c UNIVERSITY OF MARYLAND BALTIMORE COUNTY   (United States)

^d UNIVERSITY OF BREMEN   (Germany)

^e GEORGIA INSTITUTE OF TECHNOLOGY   (United States)

^f UNIVERSITY OF COLORADO   (United States)

^g EARTH SYSTEM RESEARCH LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; AEROSOLS; ATMOSPHERIC CHEMISTRY; DUST; ERROR ANALYSIS; OCEANOGRAPHY; OZONE; RADIATIVE TRANSFER; SCATTERING; SULFUR; SULFUR DIOXIDE;

AIR MASS FACTOR; ALGORITHM DEVELOPMENT; ANNUAL MEAN; ATMOSPHERIC CHEMISTRY MODEL; EAST ASIA; EAST CHINA; ERROR ASSESSMENT; IN-SITU MEASUREMENT; LINE-OF-SIGHT; MINERAL DUST; RADIATIVE TRANSFER MODEL; SATELLITE INSTRUMENTS; SCATTERING AND ABSORPTION; SEASONAL MEAN; SENSITIVITY STUDIES; SHAPE FACTOR; SURFACE ALBEDO; VERTICAL COLUMNS;

ULTRAVIOLET SPECTROMETERS;

AIR MASS; ALGORITHM; ANTHROPOGENIC SOURCE; ATMOSPHERIC CHEMISTRY; BACKSCATTER; DUST; ERROR ANALYSIS; OZONE; RADIATIVE TRANSFER; SCIAMACHY; SULFUR DIOXIDE; ULTRAVIOLET RADIATION;

EID: 72049114692     PISSN: 01480227     EISSN: None     Source Type: Journal    
DOI: 10.1029/2009JD012123     Document Type: Article

References (81)

1. Afe, O. T, A. Richter, B. Sierk, F. Wittrock, and J. P. Burrows (2004), BrO emission from volcanoes: A survey using GOME and SCIAMACHY measurements, Geophys. Res. Lett., 31, L24113, doi:10.1029/2004GL020994. (Pubitemid 40301185)
2. Alexander, B., J. Savarino, C. C. W. Lee, R. J. Park, D. J. Jacob, M. H. Thiemens, Q. B. Li, and R. M. Yantosca (2005), Sulfate formation in sea-salt aerosols: Constraints from oxygen isotopes, J. Geophys. Res., 110, D10307, doi:10.1029/2004JD005659. (Pubitemid 40919779)
3. Andres, R. J., and A. D. Kasgnoc (1998), A time-averaged inventory of subaerial volcanic sulfur emissions. J. Geophys. Res., 103(D\9). 25,251 -25,261, doi: 10.1029/98JD02091.
4. Barnard, J. C, R. Volkamer, and E. I. Kassianov (2008), Estimation of the mass absorption cross section of the organic carbon component of aerosols in the Mexico City Metropolitan Area (MCMA), Atmos. Chem. Phys., 8, 6665-6679.
5. Beirle, S., U. Piatt, R. Von Glasow, M. Wenig, and T. Wagner (2004), Estimate of nitrogen oxide emissions from shipping by satellite remote sensing, Geophys. Res. Lett., 31, L18102, doi:10.1029/2004GL020312. (Pubitemid 39660772)
6. Bey, I., D. J. Jacob, R. M. Yantosca, J. A. Logan, B. D. Field, A. M. Fiore, Q. Li, H. Y. Liu, L. J. Mickley, and M. G. Schultz (2001), Global modeling of tropospheric chemistry with assimilated meteorology: Model description and evaluation, J. Geophys. Res., 106(D\9). 23,073-23,095, doi: 10.1029/2001JD000807.
7. Bhartia, P. K., and C. W. Wellemeyer (2002), TOMS-V8 total O3 algorithm, version 2.0, ATBD-OMI-02, NASA Goddard Space Flight Cent, Green-belt, Md. (Available at http://eospso.gsfc.nasa.gov/eos-homepage/for-scientists/atbd/ docs/OMI/ATBD-OMl-02.pdf).
8. Boersma, K. F., H. J. Eskes, and E. J. Brinksma (2004), Error analysis for tropospheric NO2 retrieval from space, J. Geophys. Res., 109, D04311, doi: 10.1029/2003JD003962.
9. Bogumil, K., et al. (2003), Measurements of molecular absorption spectra with the SCIAMACHY Pre-Flight Model: Instrument characterization and reference data for atmospheric remote sensing in the 230-2380 nm region, J. Photochem. Photobiol. A, 157, 167-184.
10. Cam, S. A., N. A. Krotkov, M. A. Gray, and A. J. Krueger (2004), Fire at Iraqi sulfur plant emits SOi clouds detected by Earth probe TOMS, Geophys. Res. Lett., 31, L19105, doi:10.1029/2004GL020719. (Pubitemid 40046919)
11. Cam, S. A., A. J. Krueger, N. A. Krotkov, K. Yang, and P. F. Levelt (2007), Sulfur dioxide emissions from Peruvian copper smelters detected by the Ozone Monitoring Instrument, Geophys. Res. Lett., 34, L09801, doi: 10.1029/2006GL029020. (Pubitemid 47008168)
12. Chance, K. (2005), Ultraviolet and visible spectroscopy and spaceborne remote sensing of the Earth's atmosphere, C. R. Phys., 6, 836-847.
13. Chin, M., and D. J. Jacob (1996), Anthropogenic and natural contributions to tropospheric sulfate: A global model analysis, J. Geophys. Res., 101(D13), 18,691-18,699.
14. Climate Change Science Program (CCSP) (2009), Atmospheric aerosol properties and climate impacts, report, NASA, Washington, D. C.
15. Colarco, P. R., O. B. Toon, O. Torres, and F. J. Rasch (2002), Determining the U V imaginary part of refractive index of Saharan dust particles from TOMS data and a three dimensional model of dust transport, J. Geophys. Res., /07(D16), 4289, doi: 10.1029/2001JD000903. (Pubitemid 43206164)
16. Corr, C. A., N. Krotkov, S. Madronich, J. R. Slusser, B. Holben, W. Gao, J. Flynn, B. Lefer, and S. M. Kreidenweis (2009), Retrieval of aerosol single scattering albedo at ultraviolet wavelengths at the Tl site during MILAGRO, Atmos. Chem. Phys., 9, 5813-5827.
17. de Rooij, W. A., and C. C. A. H. van der Stap (1984), Expansion of Mie scattering matrics in generalized spherical functions, Astron. Astrophys., 131, 237-248.
18. Dickerson, R. R., et al. (2007), Aircraft observations of dust and pollutants over northeast China: Insight into the meteorological mechanisms of transport, J. Geophys. Res., 112, D24S90, doi:10.1029/2007JD008999.
19. Eisinger, M., and J. P. Burrows (1998), Tropospheric sulfur dioxide observed by the ERS-2 GOME instrument, Geophys. Res. Lett., 25(22), 4177-4180, doi:10.1029/1998GL900128.
20. Evans, M. J., and D. J. Jacob (2005), Impact of new laboratory studies of N2O5 hydrolysis on global model budgets of tropospheric nitrogen oxides, ozone, and OH, Geophys. Res. Lett. 32, L09813, doi: 10.1029/2005GL022469. (Pubitemid 40875844)
21. Fairlie, T. D., D. J. Jacob, and R. J. Park (2007), The impact of transpacific transport of mineral dust in the United States, Atmos. Environ., 41, 1251-1266, doi: 10.1016/j.atmosenv.2006.09.048. (Pubitemid 46043443)
22. Fishman, J., et al. (2008), Remote sensing of tropospheric pollution from space, Bull. Am. Meteorol. Soc., 89, 805-821. doi: 10.1175/2008BAMS2526.1.
23. Hains, J. C. (2007), A chemical climatology of lower tropospheric trace gases and aerosols over the mid-Atlantic region, Ph.D. dissertation, Univ. of Md. at College Park, College Park.
24. Heald, C. L., D. J. Jacob, R. J. Park, B. Alexander, T. D. Fairlie, R. M. Yantosca, and D. A. Chu (2006), Transpacific transport of Asian anthropogenic aerosols and its impact on surface air quality in the United States, J. Geophys. Res., 111, D14310, doi:10.1029/2005JD006847. (Pubitemid 46055362)
25. Herman, J. R., and E. A. Celarier (1997), Earth surface reflectivity climatology at 340-380 nm from TOMS data, J. Geophys. Res., 102(D23), 28,003-28,011, doi: 10.1029/97JD02074.
26. Hirsch, R. M., and E. J. Gilroy (1984), Methods of fitting a straight line to data: Examples in water resources, Water Resour. Bull., 20(5), 705-711.
27. Hudman, R. C, et al. (2007), Surface and lightning sources of nitrogen oxides over the United States: Magnitudes, chemical evolution, and outflow, J. Geophys. Res., 112, D12S05, doi:10.1029/2006JD007912. (Pubitemid 47241661)
28. Inn, E. C. Y., and J. F. Vedder (1981), Measurement of stratospheric sulfur constituents, Geophys. Res. Lett., 5(1), 5-8, doi:10.1029/ GL008i001p00005.
29. Intergovernmental Panel on Climate Change (IPCC) (2007), Climate Change 2007: The Physical Science Basis, Contribution of Working Group 1 to the Fourth Assessment, Report of the Intergovernmental Panel on Climate Change, edited by S. Solomon et al, Cambridge Univ. Press, Cambridge, U. K.
30. Jacob, D. J. (2000), Heterogeneous chemistry and tropospheric ozone, Atmos. Environ., 34, 2131-2159, doi:10.1016/S1352-2310(99)00462-8. (Pubitemid 30151069)
31. Joiner, J., and A. P. Vasilkov (2006), First results from the OMI rotational Raman scattering cloud pressure algorithm, IEEE Trans. Geosci. Remote Sens., 44(5), 1272-1282, doi:10.1109/TGRS.2005.861385.
32. Khokhar, M. F., C. Frankenberg, M. Van Roozendael, S. Beirle, S. K̈ril, A. Richter, U. Platt, and T. Wagner (2005), Satellite observation of atmospheric SO2 from volcanic eruptions during the time-period of 1996-2002, Adv. Space Res., 36, 879-887, doi:10.1016/j.asr.2005.04.114.
33. Kim, S., et al. (2007), Measurement of HO2 NO2 in the free troposphere during the Intercontinental Chemical Transport Experiment-North America 2004, J. Geophys. Res., 112, D12S01, doi: 10.1029/2006JD007676. (Pubitemid 47241658)
34. Krotkov, N. A., P. K. Bhartia, J. Herman. J. Slusser, G. Scott, G. Labow, A. Vasilkov, T. Eck, O. Dubovik, and B. Holben (2005), Aerosol UV absorption experiment (2002-04), 2. Absorption optical thickness, refractive index, and single scattering albedo, Opt. Eng., 44(4), 041005, doi:10.1117/1.1886819. (Pubitemid 41047055)
35. Krotkov, N. A., S. A. Cam, A. J. Krueger, P. K. Bhartia, and K. Yang (2006), Band residual difference algorithm for retrieval of SO2 from the Aura Ozone Monitoring Instrument (OMI), IEEE Trans. Geosci. Remote Sens., 44(5), 1259-1266, doi:10.1109/TGRS.2005.861932.
36. Krotkov, N. A., et al. (2008), Validation of SO2 retrievals from the Ozone Monitoring Instrument (OMI) over NE China, J. Geophys. Res., 113, D16S40, doi: 10.1029/2007JD008818.
37. Krueger, A. (1983), Sighting of El Chichon sulfur dioxide clouds with the Nimbus 7 total ozone mapping spectrometer, Science, 220, 1377-1379, doi:10.1126/science.220.4604.1377.
38. Krueger, A., L. Walter, P. Bhartia, C. Schnetzler, N. Krotkov, I. Sprod, and G. Bluth (1995), Volcanic sulfur dioxide measurements from the total ozone mapping spectrometer instruments, J. Geophys. Res., 100(D1), 14,057-14,076, doi: 10.1029/95JD01222.
39. Kuhns, H., E. M. Knipping, and J. M. Vukovich (2005), Development of a United States-Mexico emissions inventory for the Big Bend Regional Aerosol and Visibility Observational (BRAVO) study, J. Air Waste Manage. Assoc., 55, 677-692.
40. Lee, C, A. Richter, J. P. Burrows, H. Lee, Y. J. Kim, Y. G. Lee, and B. C. Choi (2008a), Impact of transport of sulfur dioxide from the Asian continent on the air quality over Korea during May 2005, Atmos. Environ., 42, 1461-1475, doi:10.1016/j.atmosenv.2007.11.006.
41. Lee. C, A. Richter, M. Weber, and J. P. Burrows (2008b), SO2 retrieval from SCIAMACHY using the Weighting Function DOAS (WFDOAS) technique: Comparison with standard DOAS retrieval, Atmos. Chem. Phys., 8, 17,297-17,341.
42. Martin, R. V., et al. (2002), An improved retrieval of tropospheric nitrogen dioxide from GOME, J. Geophys. Res., 107(D20), 4437, doi:10.1029/2001JD001027.
43. Martin, R. V., D. J. Jacob, K. Chance, T. P Kurosu, P. I. Palmer, and M. J. Evans (2003a), Global inventory of nitrogen oxide emissions constrained by space-based observations of NO2 columns. J. Geophys. Res., 108(D17). 4537, doi:10.1029/2003JD003453.
44. Martin, R. V., D. J. Jacob, R. M. Yantosca, M. Chin, and P. Ginoux (2003b), Global and regional decreases in tropospheric oxidants from photochemical effects of aerosols, J. Geophys. Res., 108(D3), 4097, doi: 10.1029/2002JD002622.
45. Millet, D. B., et al. (2006), Formaldehyde distribution over North America: Implications for satellite retrievals of formaldehyde columns and isoprene emission, J. Geophys. Res., 111, D24S02, doi:10.1029/2005JD006853. (Pubitemid 47260805)
46. Mishchenko, M. I., J. M. Dlugach, E. G. Yanovitskij, and N. T. Zakharova (1999), Bidirectional reflectance of flat, optically thick particulate layers: An efficient radiative transfer solution and applications to snow and soil surfaces, J. Quant. Spectrosc. Radiat. Transfer, 63, 409-432, doi: 10.1016/S0022-4073(99)00028-X.
47. Newhall, C. G., and S. Self (1982), The volcanic explosivity index (VEI): An estimate of explosive magnitude for historical volcanism, J. Geophys. Res., 87(C2), 1231-1238, doi:10.1029/JC087iCO2p01231.
48. Olivier, J. G. J., J. J. M. Berdowski, J. A. H. W. Peters, J. Bakker, A. J. H. Visschedijk, and J. P. J. Bloos (2001), Applications of EDGAR including a description of EDGAR 3.2: Reference database with trend data for 1970-1995, RIVM Rep. 773301001, Natl. Inst, of Public Health and the Environ., Bilthoven.
49. Palmer, P. L., D. J. Jacob, K. Chance, R. V. Martin, R. J. D. Spurr, T. P. Kurosu, I. Bey, R. Yantosca, A. Fiore, and Q. Li (2001), Air mass factor formulation for spectroscopic measurements from satellites: Application to formaldehyde retrievals from the Global Ozone Monitoring Experiment,J. Geophys. Res., 106(D13), 14,539-14,550, doi:10.1029/2000JD900772.
50. Park, R. J., D. J. Jacob, M. Chin, and R. V. Martin (2003), Sources of carbonaceous aerosols over the United States and implications for natural visibility, J. Geophys. Res., 108(D12), 4355, doi:10.1029/2002JD003190.
51. Park, R. J., D. J. Jacob, B. D. Field, and R. M. Yantosca (2004), Natural and transboundary pollution influences on sulphate-nitrate ammonium aerosols in the United States: Implications for policy, J. Geophys. Res., 109, D15204, doi: 10.1029/2003JD004473.
52. Patterson, E. M., D. A. Gillet, and B. H. Stockton (1977), Complex index of refraction between 300 and 700 nm for Saharan aerosol, J. Geophys. Res., 52(21), 3153-3160, doi:10.1029/JC082i021p03153.
53. Prata, A. J., S. A. Cam, A. Stohl, and J. Kerkmann (2007), Long range transport and fate of a stratospheric volcanic cloud from Soufriere Hills volcano, Montserrat, Atmos. Chem. Phys., 7, 5093-5103. (Pubitemid 47537999)
54. Pyle, D. M., P. D. Beattie, and G. J. S. Bluth (1996), Sulphur emissions to the stratosphere from explosive volcanic eruptions, Bull. Volcanol., 57, 663-671, doi: 10.1007/s004450050119.
55. Richter, A., and J. P. Burrows (2002), Tropospheric NO2 from GOME measurements, Adv. Space Res., 29, 1673-1683, doi: 10.1016/S0273-1177(02)00100- X. (Pubitemid 34781376)
56. Richter, A., V. Eyring, J. P. Burrows, H. Bovensmann, A. Lauer, B. Sierk, and P. J. Crutzen (2004), Satellite measurements of NO2 from international shipping emissions, Geophys. Res. Lett., 31, L23110, doi:10.1029/2004GL020822. (Pubitemid 40482418)
57. Richter, A., F. Wittrock, and J. P. Burrows (2006), SO2 Measurements with SCIAMACHY, paper presented at Atmospheric Science Conference 2006, Eur. Space Agency, Frascati, Italy.
58. Ryerson, T. B., et al. (1998), Emissions lifetimes and ozone formation in power plant plumes, J. Geophys. Res., 103(D17), 22,569-22,583, doi: 10.1029/98JDO1620.
59. Sauvage, B., R. V. Martin, A. van Donkelaar, X. Liu, K. Chance, L. Jaegĺ, P. I. Palmer, S. Wu, and T.-M. Fu (2007), Remote sensed and in situ constraints on processes affecting tropical tropospheric ozone, Atmos. Chem. Phys., 7, 815-838.
60. Simkin, T., and L. Siebert (1994), Volcanoes of the World, 2nd ed., 368 pp., Geosci. Press, Tucson, Ariz.
61. Singh, H. B., W. H. Brune, J. H. Crawford, D. J. Jacob, and P. B. Russell (2006), Overview of the summer 2004 Intercontinental Chemical Transport Experiment-North America (INTEX-A), J. Geophys. Res., 111, D24S01, doi:10.1029/2006JD007905. (Pubitemid 47260804)
62. Singh, H. B., W. H. Brune, J. H. Crawford, F. Flocke, and D. J. Jacob (2009), Chemistry and transport of pollution over the Gulf of Mexico and the Pacific: Spring 2006 INTEX-B Campaign overview and first results, Atmos. Chem. Phys., 9, 2301-2318.
63. Sinyuk, A., O. Torres, and O. Dubovik (2003), Combined use of satellite and surface observations to infer the imaginary part of refractive index of Saharan dust, Geophys. Res. Lett., 30(2), 1081. doi:10.1029/2002GL016189.
64. Spurr, R. J. D. (2002), Simultaneous derivation of intensities and weighting functions in a general pseudo-spherical discrete ordinate radiative transfer treatment, J. Quant. Spectrosc. Radiat. Transfer, 75, 129-175, doi: 10.1016/S0022-4073(01)00245-X. (Pubitemid 34869927)
65. Spurr, R. J. D., T. P. Kurosu, and K. V. Chance (2001), A linearized discrete ordinate radiative transfer model for atmospheric remote-sensing retrieval, J. Quant. Spectrosc. Radiat. Transfer, 68, 689-735, doi:10.1016/'S0022-4073(00)00055-8.
66. Streets, D. G., and S. T. Waldhoff (2000), Present and future emissions of air pollutants in China: SO2, NOx, and CO, Atmos. Environ., 34, 363-374, doi: 10.1016/S1352-2310(99)00167-3. (Pubitemid 32210624)
67. Taubman, B. F. J. C. Mains, A. M. Thompson, L. T. Marufu, B. G. Doddridge, J. W. Stehr, C. A. Piety, and R. R. Dickerson (2006), Aircraft vertical profiles of trace gas and aerosol pollution over the mid-Atlantic United States: Statistics and meteorological cluster analysis. J. Geophys. Res., 111, D10S07, doi:10.1029/2005JD006196. (Pubitemid 44043266)
68. Thomas, W., T. Erbertseder, T. Ruppert, M. Van Roozendael, J. erdebout, D. Balis, C. Meleti, and C. Zerefos (2005), On the retrieval of volcanic sulfur dioxide emissions from GOME backscatter measurements, J. Atmos. Chem., 50, 295-320, doi:10.1007/sl0874-005-5544-l.
69. Torres, O., and P. K. Bhartia (1999), Impact of tropospheric aerosol absorption on ozone retrieval from backscattered ultraviolet measurements. J. Geophys. Res., 104(D17), 21,569-21,577.
70. Torres, O., A. Tanskanen, B. Veihelmann, C. Ahn, R. Braak, P. K. Bhartia, P. Veefkind, and P. Levelt (2007), Aerosols and surface UV products from Ozone Monitoring Instrument observations: An overview, J. Geophys. Res., 112, D24S47, doi:10.1029/2007JD008809.
71. Vandaele, A. C, P. C. Simon, J. M. Guilmot, M. Carleer, and R. Colin (1994), SO2 absorption cross section measurement in the UV using a Fourier transform spectrometer, J. Geophys. Res., 99(D12), 25,599-25,605, doi:10.1029/94JD02187.
72. van Donkelaar, A., et al. (2008), Analysis of aircraft and satellite mea surements from the Intercontinental Chemical Transport Experiment (INTEX-B) to quantify long-range transport of East Asian sulfur to Canada, Atmos. Chem. Phys., 8, 2999-3014.
73. Van Roozendael, M., V. Soevijanta, C. Fayt, and J.-C. Lamvert (2002), Investigation of DOAS issues affecting the accuracy of the GDP version 3.0 total ozone product, in ERS-2 GOME GDP 3.0 Implementation and Delta Validation, pp. 97-129, Eur. Space Agency, Frascati,Italy.
74. Vasilkov, A., J. Joiner, R. Spurr, P. K. Bhartia, P. Levelt, and G. Stephens (2008), Evaluation of the OMI cloud pressures derived from rotational Raman scattering by comparisons with other satellite data and radiative transfer simulations, J. Geophys. Res., 113, D15S19, doi:10.1029/2007JD008689.
75. Vountas M.,V. V. Rozanov, J. P. Burrows, Ring effect: Impact of rotational Raman scattering on radiative transfer in Earth's atmosphere. J. Quant. Spectrosc. Radiat. Transfer, 60, 943-961, doi:10.1016/S0022-4073(97) 00186-6 (Pubitemid 29105871)
76. Wang, C, J. J. Corbett, and J. Firestone (2008), Improving spatial representation of global ship emissions inventories, Environ. Sci. Technol., 42, 193-199, doi:10.1021/es0700799.
77. Wang, P., P. Starnmes, R. van der A, G. Pinardi, and M. van Roozendael (2008), FRESCO+: An improved O2 A-band cloud retrieval algorithm for tropospheric trace gas retrievals, Atmos. Chem. Phys., 8, 6565-6576.
78. Weber, M., L, N. Lamsal, and J. P. Burrows (2007), Improved SCIAMACHY total ozone retrieval: Steps towards homogenizing long-term total ozone datasets from GOME, SCIAMACHY, and GOME2, paper presented at 2007 ESA ENVISAT Symposium, Eur. Space Agency, Montreux, Switzerland.
79. Wenig, M. O., A. M. Cede, E. J. Bucsela, E. A. Celarier, K. F. Boersma, J. P. Veefkind, E. J. Brinksma, J. F. Gleason, and J. R. Herman (2008), Validation of OMI tropospheric NO2 column densities using direct-sun mode Brewer measurements at NASA Goddard Space Flight Center, J. Geophys. Res., 113, D16S45, doi: 10.1029/2007JD008988.
80. Yang, K., N. A. Krotkov, A. J. Krueger, S. A. Cam, P. K. Bhartia, and P. F. Levelt (2007), Retrieval of large volcanic SO2 columns from the Aura Ozone Monitoring Instrument: Comparison and limitations. J. Geophys. Res., 112. D24S43. doi:10.1029/2007JD008825.
81. Zhang, Q., et al. (2009), Asian emissions in 2006 for the NASA INTEX-B mission, Atmos. Chem. Phys. Discuss., 9, 4081-4139.