Lok Lamsal, Senior Scientist, Earth Sciences

Lok Lamsal

Contact Info

NASA Goddard Space Flight Center
Bldg. 33
Greenbelt, MD 20771
Phone: 301-614-5160
Email: lok.lamsal@nasa.gov

Research Interests

Retrieval and validation of trace gases from satellite measurements, Interpretation of satellite observations and model simulation for surface air quality and emissions, Radiative transfer.


Dr. Lok Lamsal received a Ph.D. in Atmospheric Science from the Institute of Remote Sensing, University of Bremen, Germany in 2006. His doctoral research focused on developing improved total ozone retrieval algorithm for hyper-spectral satellite instrument: GOME and SCIAMACHY. From 2006 to 2010, he worked as a postdoctoral fellow at Dalhousie University, Halifax, Canada, where his research focus was on interpreting NO2 observations from satellite using in-situ measurements and a chemistry transport model (GEOS-Chem). He developed methods to infer ground-level NO2 concentration and to timely update bottom-up NOx emission using satellite data, and helped improve tropospheric NO2 retrievals from the OMI satellite instrument. In 2011, he joined GEST/UMBC and later GESTAR/USRA working at NASA/GSFC. His current research areas include development/improvement of retrieval algorithm for OMI and future satellite instruments, validation of algorithm/product, and interpretation of satellite observations using in-situ data and model simulations.


84) Seo, S., Kim, S.-W., Kim, K.-M., Lamsal, L.N., Jin, H., Reduction in NO2 concentrations in Seoul, South Korea detected from Space and ground-based monitors prior to and during the COVID-19 pandemic, Environ. Res. Commun., https://doi.org/10.1088/2515-7620/abed92, 2021.

83) Campbell, P., C. Campbell, D. Tong, Y. Tang, B. Baker, P. Lee, R. Saylor, A. Stein, S. Ma, L. N. Lamsal, Impacts of the COVID-19 Economic Slowdown on Ozone Pollution in the U.S., Atmos. Env., 2020 (submitted).

82) Tang, W., Edwards, D. P., Emmons, L. K., Worden, H. M., Judd, L. M., Lamsal, L. N., Al-Saadi, J. A., Janz, S. J., Crawford, J. H., Deeter, M. N., Pfister, G., Buchholz, R. R., Gaubert, B., and Nowlan, C. R.: Assessing sub-grid variability within satellite pixels using airborne mapping spectrometer measurements, Atmos. Meas. Tech. Discuss. [preprint], https://doi.org/10.5194/amt-2020-509, in review, 2021.

81) Ma, S., Tong, D., Lamsal, L., Wang, J., Zhang, X., Tang, Y., Saylor, R., Chai, T., Lee, P., Campbell, P., Baker, B., Kondragunta, S., Judd, L., Berkoff, T. A., Janz, S. J., and Stajner, I.: Improving predictability of high ozone episodes through dynamic boundary conditions, emission refresh and chemical data assimilation during the Long Island Sound Tropospheric Ozone Study (LISTOS) field campaign, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1291, in review, 2021.

80) Lamsal, L. N., Krotkov, N. A., Vasilkov, A., Marchenko, S., Qin, W., Yang, E.-S., Fasnacht, Z., Joiner, J., Choi, S., Haffner, D., Swartz, W. H., Fisher, B., and Bucsela, E.: Ozone Monitoring Instrument (OMI) Aura nitrogen dioxide standard product version 4.0 with improved surface and cloud treatments, Atmos. Meas. Tech., 14, 455–479, https://doi.org/10.5194/amt-14-455-2021, 2021.

79) Sathe, Y., Gupta, P., Bawase, M., Lamsal, L.N., Patadia, F., Thipse, S., Surface and satellite observations of air pollution in India during COVID-19 lockdown: Implication to air quality, Sustainable Cities and Society, 66, https://doi.org/10.1016/j.scs.2020.102688, 2021.

78) Allen, D.J., Pickering, K.E., Lamsal, L.N., Mach, D., Quick, M.G., Lapierre, J., Janz, S., Koshak, W., Kowalewski, M., and Blakeslee, R., Observations of Lightning NOx Production from 4 GOES-R Post Launch Test Field Campaign Flights, J. Geophys. Res., DOI: 10.1029/2020JD033769, 2021.

77) Li, J., Wang, Y., Zhang, R., Smeltzer, C., Weinheimer, A., Herman, J., Boersma, K. F., Celarier, E. A., Long, R. W., Szykman, J. J., Delgado, R., Thompson, A. M., Knepp, T. N., Lamsal, L. N., Janz, S. J., Kowalewski, M. G., Liu, X., and Nowlan, C. R.: Comprehensive evaluations of diurnal NO2 measurements during DISCOVER-AQ 2011: Effects of resolution dependent representation of NOx emissions, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1193, in review, 2021.

76) Soni, M., Verma, S., Jethava, H., Payra, S., Lamsal, L., Gupta, P., Singh, J. Impact of COVID-19 on the Air Quality over China and India Using Long-term (2009-2020) Multi-Satellite Data. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.06.0295, 2020.

75) Liu, F., A. Page, Strode, S.A., Yoshida, Y., Choi, S., Zheng, B., Lamsal, L.N., Li, C., Krotkov, N.A., Eskes, H., van der A, R., Veefkind, P., Levelt, P.F., Hauser, O.P., and Joiner, J., Abrupt decline in tropospheric nitrogen dioxide over China after the outbreak of COVID-19, Science Adv., eabc2992 10.1126/sciadv.abc2992, 2020.

74) Vasilkov, A., Krotkov, N., Yang, E.-S., Lamsal, L.N., Joiner, J., Castellanos, P., Fasnacht, Z., and Spurr, R.: Explicit and consistent aerosol correction for visible wavelength satellite cloud and nitrogen dioxide retrievals based on optical properties from a global aerosol analysis, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2019-458, in review, 2020.

73) Choi, S., Lamsal, L. N., Follette-Cook, M., Joiner, J., Krotkov, N. A., Swartz, W. H., Pickering, K. E., Loughner, C. P., Appel, W., Pfister, G., Saide, P. E., Cohen, R. C., Weinheimer, A. J., and Herman, J. R.: Assessment of NO2 observations during DISCOVER-AQ and KORUS-AQ field campaigns, Atmos. Meas. Tech., 13, 2523–2546, https://doi.org/10.5194/amt-13-2523-2020, 2020.

72) Souri, A.H., Nowlan, C.R., Wolfe, G.M., Lamsal, L.N., Chan Miller, C.E., González Abad, G., Janz, S.J., Fried, A., Blake, D.R., Weinheimer, A.J., Diskin, G.S., Liu, X., Chance, K., Revisiting the effectiveness of HCHO/NO2 ratios for inferring ozone sensitivity to its precursors using high resolution airborne remote sensing observations in a high ozone episode during the KORUS-AQ campaign, Atmos. Environ., 224, 117341, ISSN 1352-2310, 2020.

71) Goldberg, Daniel; Lu, Zifeng; Oda, Tomohiro; Lamsal, Lok; Liu, Fei; Griffin, Debora; Mclinden, Chris; Krotkov, Nickolay; Duncan, Bryan; Streets, David, Exploiting OMI NO2 satellite observations to infer fossil-fuel CO2 emissions from U.S. megacities. Sci. Tot. Environ, 695, 133805, 10.1016/j.scitotenv.2019.133805, 2019.

70) Goldberg, Daniel; Lu, Zifeng; Streets, David G.; de Foy, Benjamin; Griffin, Debora; McLinden, Chris; Lamsal, Lok; Krotkov, Nickolay; Eskes, Henk, Enhanced capabilities of TROPOMI NO2: Estimating NOx from North American cities and power plants, Environ. Sci. Technol., in press, 2019.

69) Liu, F., Duncan, B. N., Krotkov, N. A., Lamsal, L. N., Beirle, S., Griffin, D., McLinden, C. A., Goldberg, D. L., and Lu, Z.: A methodology to constrain carbon dioxide emissions from coal-fired power plants using satellite observations of co-emitted nitrogen dioxide, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2019-521, in review, 2019.

68) Silvern, R. F., Jacob, D. J., Mickley, L. J., Sulprizio, M. P., Travis, K. R., Marais, E. A., Cohen, R. C., Laughner, J. L., Choi, S., Joiner, J., and Lamsal, L. N.: Using satellite observations of tropospheric NO2 columns to infer long-term trends in US NOx emissions: the importance of accounting for the free tropospheric NO2 background, Atmos. Chem. Phys., 19, 8863–8878, https://doi.org/10.5194/acp-19-8863-2019, 2019.

67) Gonzalo Gonzalez Abad, Amir Hossein Souri, Juseon Bak, Kelly Chance, Lawrence E. Flynn, Nickolay A. Krotkov, Lok Lamsal, Can Li, Xiong Liu, Christopher Chan Miller, Caroline R. Nowlan, Raid Suleiman, Huiqun Wang, Five decades observing Earth’s atmospheric trace gases using ultraviolet and visible backscatter solar radiation from space, J. Quant. Spectro. Rad. Trans., ISSN 0022-4073, https://doi.org/10.1016/j.jqsrt.2019.04.030, 2019.

66) Griffin, D., Zhao, X., McLinden, C. A., Boersma, F., Bourassa, A., Dammers, E., Degenstein, D., Eskes, H., Fehr, L., Fioletov, V., Hayden, K., Kharol, S.K., Li, S.-M., Makar, P., Martin, R.V., Mihele, C., Mittermeier, R.L., Krotkov, N., Sneep, M., Lamsal, L.N., Linden, M., van Geffen, J., Veefkind, P., Wolde, M., High?resolution mapping of nitrogen dioxide with TROPOMI: First results and validation over the Canadian oil sands. Geophysical Research Letters, 46, 1049– 1060. https://doi.org/10.1029/2018GL081095, 2019.

65) Adams, C., McLinden, C. A., Shephard, M. W., Dickson, N., Dammers, E., Chen, J., Makar, P., Cady-Pereira, K. E., Tam, N., Kharol, S. K., Lamsal, L. N., and Krotkov, N. A.: Satellite-derived emissions of carbon monoxide, ammonia, and nitrogen dioxide from the 2016 Horse River wildfire in the Fort McMurray area, Atmos. Chem. Phys., 19, 2577-2599, https://doi.org/10.5194/acp-19-2577-2019, 2019.

64) Sarah A. Strode, Jerald R. Ziemke, Luke D. Oman, Lok N. Lamsal, Mark A. Olsen, Junhua Liu, Global Changes in the Diurnal Cycle of Surface Ozone, Atmos. Env., 199 323-333, 2019.

63) Anenberg, S. C., Henze,D. K., Tinney, V., Kinney, P.L., Raich, W., Fann, N., Malley, C.S., Roman, H., Lamsal, L.N., Duncan, B., Martin, R.V., van Donkelaar, A., Brauer, M., Doherty, R., Jonson, J.E., Davila, Y., Sudo, K., and Kuylenstierna, J.C.I., Estimates of the Global Burden of Ambient PM2.5, Ozone, and NO2 on Asthma Incidence and Emergency Room Visits, Environ. Heal. Perspect. 126:10 CID: 107004 https://doi.org/10.1289/EHP3766, 2018.

62) Tzortziou, M.; Parker, O.; Lamb, B.; Herman, J.R.; Lamsal, L.; Stauffer, R.; Abuhassan, N. Atmospheric Trace Gas (NO2 and O3) Variability in South Korean Coastal Waters, and Implications for Remote Sensing of Coastal Ocean Color Dynamics. Remote Sens., 10, 1587, 2018.

61) Goldberg, D. L., Saide, P. E., Lamsal, L. N., de Foy, B., Lu, Z., Woo, J.-H., Kim, Y., Kim, J., Gao, M., Carmichael, G., and Streets, D. G.: A top-down assessment using OMI NO2 suggests an underestimate in the NOx emissions inventory in Seoul, South Korea, during KORUS-AQ, Atmos. Chem. Phys., 19, 1801-1818, https://doi.org/10.5194/acp-19-1801-2019, 2019.

60) Zara, M., Boersma, K. F., De Smedt, I., Richter, A., Peters, E., van Geffen, J. H. G. M., Beirle, S., Wagner, T., Van Roozendael, M., Marchenko, S., Lamsal, L. N., and Eskes, H. J.: Improved slant column density retrieval of nitrogen dioxide and formaldehyde for OMI and GOME-2A from QA4ECV: intercomparison, uncertainty characterisation, and trends, Atmos. Meas. Tech., 11, 4033-4058, https://doi.org/10.5194/amt-11-4033-2018, 2018.

59) Vasilkov, A., Yang, E.-S., Marchenko, S., Qin, W., Lamsal, L., Joiner, J., Krotkov, N., Haffner, D., Bhartia, P. K., and Spurr, R.: A cloud algorithm based on the O2-O2 477?nm absorption band featuring an advanced spectral fitting method and the use of surface geometry-dependent Lambertian-equivalent reflectivity, Atmos. Meas. Tech., 11, 4093-4107, https://doi.org/10.5194/amt-11-4093-2018, 2018.

58) Levelt, P. F., Joiner, J., Tamminen, J., Veefkind, J. P., Bhartia, P. K., Stein Zweers, D. C., Duncan, B. N., Streets, D. G., Eskes, H., van der A, R., McLinden, C., Fioletov, V., Carn, S., de Laat, J., DeLand, M., Marchenko, S., McPeters, R., Ziemke, J., Fu, D., Liu, X., Pickering, K., Apituley, A., González Abad, G., Arola, A., Boersma, F., Chan Miller, C., Chance, K., de Graaf, M., Hakkarainen, J., Hassinen, S., Ialongo, I., Kleipool, Q., Krotkov, N., Li, C., Lamsal, L., Newman, P., Nowlan, C., Suleiman, R., Tilstra, L. G., Torres, O., Wang, H., and Wargan, K.: The Ozone Monitoring Instrument: overview of 14 years in space, Atmos. Chem. Phys., 18, 5699-5745, https://doi.org/10.5194/acp-18-5699-2018, 2018.

57) Aman Majid, Maria Val Martin, Lok N. Lamsal, Bryan N. Duncan, A decade of changes in nitrogen oxides over regions of oil and natural gas activity in the United States. Elem Sci Anth. 2017;5:76. DOI: http://doi.org/10.1525/elementa.259

56) Goldberg, D. L., Lamsal, L. N., Loughner, C. P., Swartz, W. H., Lu, Z., and Streets, D. G.: A high-resolution and observationally constrained OMI NO2 satellite retrieval, Atmos. Chem. Phys., 17, 11403-11421, https://doi.org/10.5194/acp-17-11403-2017, 2017.

55) Jin, X., Fiore, A. M., Murray, L. T., Valin, L. C., Lamsal, L. N., Duncan, B., Tonnesen, G. S., Evaluating a space-based indicator of surface ozone-NOx-VOC sensitivity over midlatitude source regions and application to decadal trends. J. Geophys. Res, 122. https://doi.org/10.1002/2017JD026720, 2017.

54) Krotkov, N. A., Lamsal, L. N., Celarier, E. A., Swartz, W. H., Marchenko, S. V., Bucsela, E. J., Chan, K. L., and Wenig, M.: The version 3 OMI NO2 standard product, Atmos. Meas. Tech., doi:10.5194/amt-2017-44, 2017.

53) Lorente, A., Folkert Boersma, K., Yu, H., Dörner, S., Hilboll, A., Richter, A., Liu, M., Lamsal, L. N., Barkley, M., De Smedt, I., Van Roozendael, M., Wang, Y., Wagner, T., Beirle, S., Lin, J.-T., Krotkov, N., Stammes, P., Wang, P., Eskes, H. J., and Krol, M.: Structural uncertainty in air mass factor calculation for NO2 and HCHO satellite retrievals, Atmos. Meas. Tech., 10, 759-782, https://doi.org/10.5194/amt-10-759-2017, 2017.

52) Ialongo, I., Herman, J., Krotkov, N., Lamsal, L., Boersma, K. F., Hovila, J., and Tamminen, J.: Comparison of OMI NO2 observations and their seasonal and weekly cycles with ground-based measurements in Helsinki, Atmos. Meas. Tech., 9, 5203-5212, doi:10.5194/amt-9-5203-2016, 2016.

51) P. Zoogman, X. Liu, R.M. Suleiman, W.F. Pennington, D.E. Flittner, J.A. Al-Saadi, B.B. Hilton, D.K. Nicks, M.J. Newchurch, J.L. Carr, S.J. Janz, M.R. Andraschko, A. Arola, B. D. Baker, B.P. Canova, C. Chan Miller, R.C. Cohen, J.E. Davis, M.E. Dussault, D.P. Edwards, J. Fishman, A. Ghulam, G. González Abad, M. Grutter, J.R. Herman, J. Houck, D.J. Jacob, J. Joiner, B.J. Kerridge, J. Kim, N.A. Krotkov, L. Lamsal, C. Li, A. Lindfors, R.V. Martin, C.T. McElroy, C. McLinden, V. Natraj, D.O. Neil, C.R. Nowlan, E.J. O’Sullivan, P.I. Palmer, R. B. Pierce, M.R. Pippin, A. Saiz-Lopez, R.J.D. Spurr, J.J. Szykman, O. Torres, J.P. Veefkind, B. Veihelmann, H. Wang, J. Wang, K. Chance, Tropospheric Emissions: Monitoring of Pollution (TEMPO), JQSRT, DOI: 10.1016/j.jqsrt.2016.05.008, 2016.

50) Lok Lamsal, Scott Janz, Nickolay A. Krotkov, Kenneth Pickering, Robert Spurr, Matthew Kowalewski, Christopher Loughner, James Crawford, William Swartz, Jay Herman, High-resolution NO2 observations from the Airborne Compact Atmospheric Mapper: Retrieval and validation, J. Geophys. Res., 122, doi:10.1002./2016JD025483, 2017.

49) Li Zhang, Daven Henze, Georg A. Grell, Omar Torres, Hiren Jethva, Lok Lamsal, What factors control the trend of increasing AAOD over the United States in the last decade?, J. Geophys. Res., 122, doi:10.1002/2016JD025472, 2017.

48) Rasool, Q. Z., Zhang, R., Lash, B., Cohan, D. S., Cooter, E., Bash, J., and Lamsal, L. N.:
Enhanced representation of soil NO emissions in the Community Multiscale Air Quality (CMAQ) model version 5.0.2, Geosci. Model Dev., 9, 3177-3197, doi:10.5194/gmd-9-3177-2016, 2016.

47) A. Vasilkov, W. Qin, N. Krotkov, L. Lamsal, R. Spurr, D. Haffner, J. Joiner, E.-S. Yang, and S. Marchenko, Accounting for the effects of surface BRDF on satellite cloud and trace-gas retrievals: A new approach based on geometry-dependent Lambertian-equivalent reflectivity applied to OMI algorithms, Atmos. Meas. Tech., 10, 333-349, doi:10.5194/amt-10-333-2017, 2017.

46) Daniel Tong, Li Pan, Weiwei Chen, Lok Lamsal, Pius Lee, Youhua Tang, Hyuncheol Kim, Shobha Kondragunta, and Ivanka Stajner, Impact of the 2008 Global Recession on air quality over the United States: Implications for surface ozone level, Geophys. Res. Lett, 43,
doi:10.1002/2016GL069885, 2016.

45) Can Li, N. Christina Hsu, Andrew M. Sayer, Nickolay A. Krotkov, Joshua S. Fu, Lok N. Lamsal, Jaehwa Lee, Si-Chee Tsay, Satellite observation of pollutant emissions from gas flaring activities near the Arctic, Atmos. Env., Vol. 133, p. 1-11, 2016.

44) Bryan N. Duncan, Lok N. Lamsal, Anne M. Thompson, Yasuko Yoshida, Zifeng Lu, David G. Streets, Margaret M. Hurwitz, Kenneth E. Pickering, A space-based, high-resolution view of notable changes in urban NOx pollution around the world (2005-2014), J. Geophys. Res., 121, 976–996, doi:10.1002/2015JD024121, 2016.

43) N. A. Krotkov, C. A. McLinden, C. Li, L. N. Lamsal, E. A. Celarier, S. V. Marchenko, W. H. Swartz, E. J. Bucsela, J. Joiner, B. N. Duncan, K. F. Boersma, J. P. Pepijn, P. F. Levelt, V. E. Fioletov, R. R. Dickerson, H. He, Z. Lu, and D. G. Streets, Aura OMI observations of regional SO2 and NO2 pollution changes from 2005 to 2015, 16, 4605-4629, Atmos. Chem. Phys., doi:10.5194/acp-16-4605-2016, 2016.

42) C. Liu, X. Liu, M. G. Kowalewski, S. J. Janz, G. González Abad, K. E. Pickering, K. Chance, and L. N. Lamsal, Analysis of ACAM Data for Trace Gas Retrievals during the 2011 DISCOVER-AQ Campaign, J. Spec., Vol. 2015, 827160, 2015.

41) Lu, Z., Streets, D. G., de Foy, B., Lamsal, L. N., Duncan, B. N., and Xing, J.: Emissions of nitrogen oxides from US urban areas: estimation from Ozone Monitoring Instrument retrievals for 2005–2014, Atmos. Chem. Phys., 15, 10367-10383, doi:10.5194/acp-15-10367-2015, 2015.

40) S. K. Kharol, R. V. Martin, S. Philip, B. Boys, L. N. Lamsal, M. Jerrett, M. Brauer, D. L. Crouse, C. McLinden, R. T. Burnett, Assessment of the Magnitude and Recent Trends in Satellite-Derived Ground-Level Nitrogen Dioxide over North America, Atmos. Env., 118, 236–245, doi:10.1016/j.atmosenv.2015.08.011, 2015.

39) Benjamin de Foy, Zifeng Lu, David G Streets, Lok N Lamsal, Bryan N Duncan, Obtaining accurate estimates of power plant NOx emissions from satellite data, Atmos. Env., 116, 1–11, doi:10.1016/j.atmosenv.2015.05.056, 2015.

38) Lok N. Lamsal, Bryan N. Duncan, Yosuko Yoshida, Nickolay A. Krotkov, Kenneth E. Pickering, David G Streets, Zifeng Lu, U.S. NO2 trends (2005–2013): EPA Air Quality System (AQS) data versus improved observations from the Ozone Monitoring Instrument (OMI), Atmos. Env., 110, pp:130-143, doi:10.1016/j.atmosenv.2015.03.055, 2015.

37) S. A. Strode, J. M. Rodriguez, J. A. Logan, O. R. Cooper, J. C. Witte, L. N. Lamsal, M. Damon, B. Van Aartsen, S. D. Steenrod, S. E. Strahan, Trends and variability in surface ozone over the United States, J. Geophys. Res., DOI: 10.1002/2014JD022784, 2015.

36) S. Marchenko, N.A. Krotkov, L.N. Lamsal, E.A. Celarier, W.H. Swartz, E.J. Bucsela, Revising the slant- column density retrieval of nitrogen dioxide observed by the Ozone Monitoring Instrument, J. Geophys. Res., DOI: 10.1002/2014JD022913, 2015.

35) Daniel Tong, Lok N. Lamsal, Li Pan, Hyuncheol Kim, Pius Lee, Tianfeng Chai, Kenneth E. Pickering, Long-term NOx trends over large cities in the United States during the Great Recession: Intercomparison of satellite retrievals, ground observations, and emission inventories, Atmos. Env., 109, DOI: 10.1016/j.atmosenv.2015.01.035, 2015.

34) Liu, C., Liu, X., Kowalewski, M. G., Janz, S. J., González Abad, G., Pickering, K. E., Chance, K., and Lamsal, L. N.: Characterization and verification of ACAM slit functions for trace gas retrievals during the 2011 DISCOVER-AQ flight campaign, Atmos. Meas. Tech., 8, 751-759, doi:10.5194/amt-8-751-2015, 2015.

33) Tang, W., Cohan, D. S., Pour-Biazar, A., Lamsal, L. N., White, A. T., Xiao, X., Zhou, W., Henderson, B. H., and Lash, B. F.: Influence of satellite-derived photolysis rates and NOx emissions on Texas ozone modeling, Atmos. Chem. Phys., 15, 1601-1619, doi:10.5194/acp-15-1601-2015, 2015.

32) Lamsal, L. N., Krotkov, N. A., Celarier, E. A., Swartz, W. H., Pickering, K. E., Bucsela, E. J., Gleason, J. F., Martin, R. V., Philip, S., Irie, H., Cede, A., Herman, J., Weinheimer, A., Szykman, J. J., and Knepp, T. N.: Evaluation of OMI operational standard NO2 column retrievals using in situ and surface-based NO2 observations, Atmos. Chem. Phys., 14, 11587-11609, doi:10.5194/acp-14-11587-2014, 2014.

31) Bryan N. Duncan, Ana I. Prados, Lok N. Lamsal, Yang Liu, David Streets, Pawan Gupta, Ernest Hilsenrath, Ralph Kahn, J. Eric Nielsen, Andreas Beyersdorf, Sharon Burton, Arlene M. Fiore, Jack Fishman, Daven Henze, Chris Hostetler, Nickolay A. Krotkov, Pius Lee, Meiyun Lin, Steven Pawson, Gabriele Pfister, Kenneth E. Pickering, Brad Pierce, Yasuko Yoshida, Luke Ziemba, Satellite Data for U.S. Air Quality Applications: Examples of Applications, Summary of Data End-User Resources, Answers to FAQs, and Common Mistakes to Avoid, Atmos. Environ., 94, 647-662, 2014.

30) Nowlan, C. R., R. V. Martin, S. Philip, L.N. Lamsal, N. A. Krotkov, E. A. Marais, S. Wang, and Q. Zhang, Global Dry Deposition of Nitrogen Dioxide and Sulfur Dioxide Inferred from Space-Based Measurements, Global Biogeochemical Cycles, 28, 10, doi: 10.1002/2014GB004805, 2014.

29) Flynn, C.M., K.E. Pickering, J.H. Crawford, L.N. Lamsal, N.A. Krotkov, J. Herman, A. Weinheimer, G. Chen, X. Liu, J. Szykman, S.-C. Tsay, C. Loughner, J. Hains, P. Lee, R.R. Dickerson, J. Stehr, L. Brent, The relationship between column-density and surface mixing ratio: statistical analysis of O3 and NO2 data from the July 2011 Maryland DISCOVER-AQ mission, Atmos. Environ., 92, 429-441, 2014.

28) David G. Streets, Benjamin de Foy, Bryan N. Duncan, Lok N. Lamsal, Can Li, Zifeng Lu, Using satellite observations to measure power-plant emissions and their trends, Air & Waste Management Association, 16, em, Feb, 2014.

27) McLinden, C.A., V. Fioletov, K.F. Boersma, S. Kharol, N.A. Krotkov, L.N. Lamsal, P.A. Makar, R.V. Martin, J.P. Veefkind, K. Yang, Improved satellite retrievals of NO2 and SO2 over the Canadian oil sands and comparisons with surface measurements, Atmos. Chem. Phys., 14, 3637-3656, 2014.

26) Philip, S., R. V. Martin, J. R. Pierce, J. L. Jimenez, Q. Zhang, M. R. Canagaratna, D. V. Spracklen, C. R. Nowlan, L. N. Lamsal, M. J. Cooper, and N. A. Krotkov, Spatially and seasonally resolved estimate of the ratio of global organic matter to organic carbon, Atmos. Environ., 87, 34-40, 2014.

25) Duncan, B.N., Y. Yoshida, B. de Foy, L.N. Lamsal, D. Streets, Zifeng Lu, K. E. Pickering, and N. A. Krotkov, The observed response of the Ozone Monitoring Instrument (OMI) NO2 column to NOx emission controls on power plants in the United States: 2005-2011, Atmos. Environ., 81, 102-111, 2013.

24) Prud’homme, G., N.A. Dobbin, L. Sun, R.T. Burnett, R.V. Martin, A. Davidson, S. Cakmak, P.J. Villeneuve, L.N. Lamsal, A. van Donkelaar, P.A. Peters, M. Johnson, Comparison of remote sensing and fixed-site monitoring approaches for examining health effects on a national study population, Atmos. Environ., 161-171, 2013.

23) Tang, W., D. Cohan, L.N. Lamsal, X. Xiao, W. Zhou, Inverse modeling of Texas NOx emissions using space-based and ground-based NO2 observations, Atmos. Chem. Phys., 13, 11005-11018, 2013.

22) Lamsal, L.N., R.V. Martin, D.D. Parrish, N.A. Krotkov, Scaling relationship for NO2 pollution and population size: A satellite perspective, Environ. Sci. Technol, 47, 7855-7861, 2013.

21) Streets, D.G., G.R. Carmichael, B. de Foy, R. R. Dickerson, B.N. Duncan, D.P. Edwards, J.A. Haynes, D.K. Henze, M.R. Houyoux, D.J. Jacob, N.A. Krotkov, L.N. Lamsal, Y. Liu, Z. Lu, R.V. Martin, G.G. Pfister, R.W. Pinder, K.J. Wecht, Emissions estimation from satellite retrievals: A review of current capability, Atmos. Environ., 77, 1011-1042, 2013.

20) Oetjen, H., S. Baidar, N.A. Krotkov, L.N. Lamsal, M. Lechner, R. Volkamer, Airborne MAX-DOAS measurements over California: testing the NASA OMI tropospheric NO2 product, J. Geophys. Res., 118, DOI: 10.1002/jgrd.50550, 2013.

19) Bucsela, E. J., Krotkov, N. A., Celarier, E. A., Lamsal, L. N., Swartz, W. H., Bhartia, P. K., Boersma, K. F., Veefkind, J. P., Gleason, J. F., and Pickering, K. E.: A new stratospheric and tropospheric NO2 retrieval algorithm for nadir-viewing satellite instruments: applications to OMI, Atmos. Meas. Tech., 6, 2607-2626, doi:10.5194/amt-6-2607-2013, 2013.

18) Cooper, M.J., R.V. Martin, A. van Donkelaar, L. N. Lamsal, M. Brauer, J. R. Brook, A satellite-based multi-pollutant index of global air quality, Environ. Sci. Technol., pp 8523-8524, doi: 10.1021/es302672p, 2012.

17) Walter, D., K.-P. Heue, A. Rauthe-Schoech, C.A.M. Brenninkmeijer, L.N. Lamsal, N. Krotkov, U. Platt , Flux calculation using CARIBIC DOAS aircraft measurements – SO2 emissions of Norilsk, J. Geophys. Res., doi:10.1029/2011JD017335, 2012.

16) Wang, S.W., Q. Zhang, D.G. Streets, K.B. He, R.V. Martin, L.N. Lamsal, D. Chen, Y. Lei, and Z. Lu, Growth in NOx emissions from power plants in China: bottom-up estimates and satellite observations, Atmos. Chem. Phys., 12, 4429-4447, 2012.

15) Anderson, H.R., B. Butland, A. van Donkelaar, M. Bauer, D.P. Strachan, T. Clayton, R. van Dingenen, M. Amann, B. Brunekreef, A. Cohen, F. Dentener, C. Lai, L.N. Lamsal, R.V. Martin, and the ISAAC Phase One and Phase Three study groups, Satellite-based estimates of ambient air pollution and global variation in childhood asthma prevalence, Environ. Health Perspec., doi:10.1289/ehp.1104724, 2012.

14) Hystad, P. P.A. Semers, K.C. Johnson, J. Brook, A. van Donkelaar, L.N. Lamsal, R. Martin, and M. Brauer, Spatiaotemporal air pollution exposure assessment for a Canadian population-based lung cancer case-control study, Env. Health, 11:22, doi:10.1186/1476-069X-11-22, 2012.

13) Matus, K., K.-M. Nam, N.E. Selin, L.N. Lamsal, J.M. Reilly, and S. Paltsev, Health Damages from Air Pollution in China, Glob. Env. Change, 22(1), 55-66, 2012.

12) Hystad, P., E. Setton, A. Cervantes, K. Poplawski, S. Deschenes, M. Brauer, A. van Donkelaar, L. Lamsal, R.V. Martin, M. Jerrett, and P. Demers, Creating National Air Pollution Models for Population Exposure Assessment in Canada, Environ. Health Perspec., 119:1123-1129. http://dx.doi.org/10.1289/ehp.1002976, 2011.

11) Lamsal, L.N., R.V. Martin, A. Padmanabhan, A. van Donkelaar, Q. Zhang, C.E. Sioris, K. Chance, T.P. Kurosu, and M.J. Newchurch, Application of satellite observations for timely updates to global anthropogenic NOx emission inventories, Geophys. Res. Lett, 38, L05810, doi:10.1029/2010GL046476, 2011.

10) Duncan, B., Y. Yoshida, J. Olson, S. Sillman, R.V. Martin, L.N. Lamsal, Y. Hu, K. Pickering, C. Retscher, D. Allen, and J. Crawford, Application of OMI observations to a space-based indicator of NOx and VOC controls on surface ozone formation, Atmos. Environ., 44, 2213-2223, 2010.

9) Lamsal, L.N., R.V. Martin, A. van Donkelaar, E.A. Celarier, E.J. Bucsela, K.F. Boersma, R. Dirksen, C. Luo, and Y. Wang, Indirect validation of tropospheric nitrogen dioxide retrieved from the OMI satellite instrument: Insight into the seasonal variation of nitrogen oxides at northern midlatitude, J. Geophys. Res., 115, doi:10.1029/2009JD013351, 2010.

8) Lamsal, L.N., R.V. Martin, M. Steinbacher, E.A. Celarier, E. Bucsela, E.J. Dunlea, and J. Pinto, Ground level nitrogen dioxide concentrations inferred from the satellite-borne Ozone Monitoring Instrument, J. Geophys. Res., 113, doi:10:1029/2007DJ009235, 2008.

7) Lamsal. L.N., M. Weber, G. Labow, and J.P. Burrows, Influence of ozone and temperature climatology on the accuracy of total ozone retrieval, J. Geophys. Res., 112, doi:10.1029/2005JD006865, 2007.

6) Kokhanovsky, A. A., B. Mayer, V.V. Rozanov, K. Wapler, L.N. Lamsal, M. Weber, J.P. Burrows, and U. Schumann, Satellite ozone retrieval under broken cloud conditions: An error analysis based on Monte-Carlo simulations, IEEE Trans. Geo. Rem. Sens., 45, 187-194, 2007.

5) Amekudzi, L.K., B.-M. Sinnhuber, N.V. Sheode, J. Meyer, A. Rozanov, L.N. Lamsal, H. Bovensmann, and J.P. Burrows, Retrieval of stratospheric NO3 vertical profiles from SCIAMACHY lunar accultation measurement over the Antarctic, J. Geophys. Res., 110, doi:10.1029/2004JD005748, 2005.

4) Bracher, A., L.N. Lamsal, M. Weber, K. Bramstedt, M. Coldewey, and J.P. Burrows, Global satellite validation of SCIAMACHY O3 columns with GOME WFDOAS, Atmos. Chem. Phys., Sref-ID: 1680-7324/acp/2005-5-2357, 2005.

3) Coldewey-Egbers, M., M. Weber, L.N. Lamsal, R. de Beek, M. Buchwitz, and J. P. Burrows, Total ozone retrieval from GOME UV spectral data using the weighting function DOAS approach”, M. Coldewey-Egbers, Atmos. Chem. Phys., Sref-ID: 1680-7324/acp/2005-5-1015, 2005.

2) Weber, L.N. Lamsal, M. Coldewey-Egbers, K. Bramstedt, and J.P. Burrows, Pole-to-pole validation of GOME WFDOAS total ozone with groundbased data, Atmos. Chem. Phys., Sref-ID: 1680-7324/acp/2005-5-1341, 2005.

1) Lamsal, L.N., M. Weber, S. Tellmann, and J.P. Burrows, Ozone column classified climatology of ozone and temperature profiles based on ozonesonde and satellite data, J. Geophy. Res., 109, doi:10.1029/2004JD004680, 2004.