Brief Bio

Doctoral, master’s, and bachelor’s degrees in experimential physics. Five years research experience in experimental plasma physics. 23 years experience in the calibration, characterization and development of remote sensing instruments for atmospheric applications in the retrieval of ozone and other trace gases important to understanding tropospheric and stratospheric chemistry. Broad experience in experimental physics, measurement techniques, optical systems, spectroscopic measurements, computer controlled data acquisition, numerical techniques in data analysis and modeling, and computer programming.
 

Publications

Refereed

Chen, X., J. Wang, X. Xu, et al. M. Zhou, H. Zhang, L. Castro Garcia, P. R. Colarco, S. J. Janz, J. Yorks, M. McGill, J. S. Reid, M. de Graaf, and S. Kondragunta. 2021. "First retrieval of absorbing aerosol height over dark target using TROPOMI oxygen B band: Algorithm development and application for surface particulate matter estimates." Remote Sensing of Environment 265 112674 [10.1016/j.rse.2021.112674]

Swartz, W. H., N. Krotkov, L. Lamsal, et al. G. Otter, F. van Kempen, J. Boldt, F. Morgan, L. van der Laan, W. Zimbeck, S. Storck, Z. Post, S. Janz, M. Kowalewski, C. Li, P. Veefkind, and P. Levelt. 2021. "CHAPS: a sustainable approach to targeted air pollution observation from small satellites." Sensors, Systems, and Next-Generation Satellites XXV [10.1117/12.2600175]

Li, J., Y. Wang, R. Zhang, et al. C. Smeltzer, A. Weinheimer, J. Herman, K. F. Boersma, E. A. Celarier, R. W. Long, J. J. Szykman, R. Delgado, A. M. Thompson, T. N. Knepp, L. N. Lamsal, S. J. Janz, M. G. Kowalewski, X. Liu, and C. R. Nowlan. 2021. "Comprehensive evaluations of diurnal NO2 measurements during DISCOVER-AQ 2011: effects of resolution-dependent representation of NO_<i>x</i> emissions." Atmospheric Chemistry and Physics 21 (14): 11133-11160 [10.5194/acp-21-11133-2021]

Allen, D. J., K. E. Pickering, L. Lamsal, et al. D. M. Mach, M. G. Quick, J. Lapierre, S. Janz, W. Koshak, M. Kowalewski, and R. Blakeslee. 2021. "Observations of Lightning NOx Production From GOES‐R Post Launch Test Field Campaign Flights." Journal of Geophysical Research: Atmospheres 126 (8): [10.1029/2020jd033769]

Chong, H., S. Lee, J. Kim, et al. U. Jeong, C. Li, N. A. Krotkov, C. R. Nowlan, J. A. Al-Saadi, S. J. Janz, M. G. Kowalewski, M.-H. Ahn, M. Kang, J. Joiner, D. P. Haffner, L. Hu, P. Castellanos, L. G. Huey, M. Choi, C. H. Song, K. M. Han, and J.-H. Koo. 2020. "High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals." Remote Sensing of Environment 241 111725 [10.1016/j.rse.2020.111725]

Sullivan, J. T., T. J. McGee, R. M. Stauffer, et al. A. M. Thompson, A. Weinheimer, C. Knote, S. Janz, A. Wisthaler, R. Long, J. Szykman, J. Park, Y. Lee, S. Kim, D. Jeong, D. Sanchez, L. Twigg, G. Sumnicht, T. Knepp, and J. R. Schroeder. 2019. "Taehwa Research Forest: a receptor site for severe domestic pollution events in Korea during 2016." Atmospheric Chemistry and Physics 19 5051-5067 [https://doi.org/10.5194/acp-19-5051-2019]

Behrenfeld, M. J., R. H. Moore, C. A. Hostetler, et al. J. Graff, P. Gaube, L. M. Russell, G. Chen, S. C. Doney, S. Giovannoni, H. Liu, C. Proctor, L. M. Bolaños, N. Baetge, C. Davie-Martin, T. K. Westberry, T. S. Bates, T. G. Bell, K. D. Bidle, E. S. Boss, S. D. Brooks, B. Cairns, C. Carlson, K. Halsey, E. L. Harvey, C. Hu, L. Karp-Boss, M. Kleb, S. Menden-Deuer, F. Morison, P. K. Quinn, A. J. Scarino, B. Anderson, J. Chowdhary, E. Crosbie, R. Ferrare, J. W. Hair, Y. Hu, S. Janz, J. Redemann, E. Saltzman, M. Shook, D. A. Siegel, A. Wisthaler, M. Y. Martin, and L. Ziemba. 2019. "The North Atlantic Aerosol and Marine Ecosystem Study (NAAMES): Science Motive and Mission Overview." Frontiers in Marine Science 6 (122): 25 [10.3389/fmars.2019.00122]

Lennartson, E. M., J. Wang, J. Gu, et al. L. Castro Garcia, C. Ge, M. Gao, M. Choi, P. E. Saide, G. R. Carmichael, J. Kim, and S. J. Janz. 2018. "Diurnal variation of aerosol optical depth and PM2.5 in South Korea: a synthesis from AERONET, satellite (GOCI), KORUS-AQ observation, and the WRF-Chem model." Atmospheric Chemistry and Physics 18 (20): 15125-15144 [10.5194/acp-18-15125-2018]

Zhang, M., C. Hu, M. G. Kowalewski, and S. J. Janz. 2018. "Atmospheric Correction of Hyperspectral GCAS Airborne Measurements Over the North Atlantic Ocean and Louisiana Shelf." IEEE Transactions on Geoscience and Remote Sensing 56 (1): 168-179 [10.1109/tgrs.2017.2744323]

Zhang, M., C. Hu, J. Cannizzaro, M. G. Kowalewski, and S. J. Janz. 2018. "Diurnal changes of remote sensing reflectance over Chesapeake Bay: Observations from the Airborne Compact Atmospheric Mapper." Estuarine, Coastal and Shelf Science 200 181-193 [10.1016/j.ecss.2017.10.021]

Lamsal, L. N., S. J. Janz, N. A. Krotkov, et al. K. E. Pickering, R. J. Spurr, M. G. Kowalewski, C. P. Loughner, J. H. Crawford, W. H. Swartz, and J. R. Herman. 2017. "High-resolution NO2 observations from the Airborne Compact Atmospheric Mapper: Retrieval and validation." Journal of Geophysical Research: Atmospheres 122 (3): 1953-1970 [10.1002/2016jd025483]

Zhang, M., C. Hu, M. G. Kowalewski, et al. S. J. Janz, Z. Lee, and J. Wei. 2017. "Atmospheric correction of hyperspectral airborne GCAS measurements over the Louisiana Shelf using a cloud shadow approach." International Journal of Remote Sensing 38 (4): 1162-1179 [10.1080/01431161.2017.1280633]

Nowlan, C. R., X. Liu, J. W. Leitch, et al. K. Chance, G. González Abad, C. Liu, P. Zoogman, J. Cole, T. Delker, W. Good, F. Murcray, L. Ruppert, D. Soo, M. B. Follette-Cook, S. J. Janz, M. G. Kowalewski, C. P. Loughner, K. E. Pickering, J. R. Herman, M. R. Beaver, R. W. Long, J. J. Szykman, L. M. Judd, P. Kelley, W. T. Luke, X. Ren, and J. A. Al-Saadi. 2016. "Nitrogen dioxide observations from the Geostationary Trace gas and Aerosol Sensor Optimization (GeoTASO) airborne instrument: Retrieval algorithm and measurements during DISCOVER-AQ Texas 2013." Atmospheric Measurement Techniques 9 (6): 2647-2668 [10.5194/amt-9-2647-2016]

Zoogman, P., X. Liu, R. Suleiman, et al. W. Pennington, D. Flittner, J. Al-Saadi, B. Hilton, D. Nicks, M. Newchurch, J. Carr, S. Janz, M. Andraschko, A. Arola, B. Baker, B. Canova, C. Chan Miller, R. Cohen, J. Davis, M. Dussault, D. Edwards, J. Fishman, A. Ghulam, G. González Abad, M. Grutter, J. Herman, J. Houck, D. Jacob, J. Joiner, B. Kerridge, J. Kim, N. Krotkov, L. Lamsal, C. Li, A. Lindfors, R. Martin, C. McElroy, C. McLinden, V. Natraj, D. Neil, C. Nowlan, E. O׳Sullivan, P. Palmer, R. Pierce, M. Pippin, A. Saiz-Lopez, R. Spurr, J. Szykman, O. Torres, J. Veefkind, B. Veihelmann, H. Wang, J. Wang, and K. Chance. 2016. "Tropospheric emissions: Monitoring of pollution (TEMPO)." Journal of Quantitative Spectroscopy and Radiative Transfer 186 17-39 [10.1016/j.jqsrt.2016.05.008]

Liu, C., X. Liu, M. G. Kowalewski, et al. S. J. Janz, G. González Abad, K. E. Pickering, K. Chance, and L. N. Lamsal. 2015. "Characterization and verification of ACAM slit functions for trace-gas retrievals during the 2011 DISCOVER-AQ flight campaign." Atmospheric Measurement Techniques 8 (2): 751-759 [10.5194/amt-8-751-2015]

Kowalewski, M. G., and S. J. Janz. 2015. "Comparison of spectral radiance responsivity calibration techniques used for backscatter ultraviolet satellite instruments." Metrologia 52 (1): 145-154 [10.1088/0026-1394/52/1/145]

Liu, C., X. Liu, M. G. Kowalewski, et al. S. J. Janz, G. González Abad, K. E. Pickering, K. Chance, and L. N. Lamsal. 2015. "Analysis of ACAM Data for Trace Gas Retrievals during the 2011 DISCOVER-AQ Campaign." Journal of Spectroscopy 2015 1-7 [10.1155/2015/827160]

Wu, X., Q. Liu, J. Zeng, et al. M. Grotenhuis, H. Qian, M. Caponi, L. Flynn, G. Jaross, B. Sen, J. R. Buss, W. Johnsen, S. J. Janz, C. Pan, J. Niu, T. Beck, E. Beach, W. Yu, M. K. Rama Varma Raja, D. Stuhmer, D. Cumpton, C. Owen, and W.-H. Li. 2014. "Evaluation of the Sensor Data Record from the nadir instruments of the Ozone Mapping Profiler Suite (OMPS)." J. Geophys. Res. Atmos. 119 (10): 6170-6180 [10.1002/2013JD020484]

Aslam, S., G. Gronoff, T. Hewagama, S. Janz, and C. Kotecki. 2012. "GaN-based Detector Technology for Next Generation Ultraviolet Planetary Missions." International Workshop on Instrumentation for Planetary Missions (IPM-2012)

Butler, J., S. Janz, B. Johnson, et al. R. Saunders, J. W. Cooper, M. Kowalewski, and R. Barnes. 2008. "Calibration of a radiance standard for the NPP/OMPS instrument." Proc. SPIE 7106, Sensors, Systems, and Next-Generation Satellites XII 7106 71060Z [10.1117/12.800194]

Janz, S. J., E. Hilsenrath, R. P. Cebula, and T. J. Kelly. 1996. "Observations of the lunar geometric albedo during the ATLAS-3 mission." Geophysical Research Letters 23 (17): 2297-2300 [10.1029/96gl01122]

Janz, S., E. Hilsenrath, J. Butler, D. F. Heath, and R. P. Cebula. 1995. "Uncertainties in radiance calibrations of backscatter ultraviolet (BUV) instruments." Metrologia 32 (6): 637-641 [10.1088/0026-1394/32/6/48]