Dr. Jay R. Herman Profile

Dr. Jay R. Herman

Project Scientist at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (34)

Proceedings Article | 10 October 2019 Presentation + Paper

Presentation + Paper

TEMPO Green Paper: Chemistry, physics, and meteorology experiments with the Tropospheric Emissions: monitoring of pollution instrument

K. Chance, X. Liu, C. Chan Miller, G. González Abad, G. Huang, C. Nowlan, A. Souri, R. Suleiman, K. Sun, H. Wang, L. Zhu, P. Zoogman, J. Al-Saadi, J. -C. Antuña-Marrero, J. Carr, R. Chatfield, M. Chin, R. Cohen, D. Edwards, J. Fishman, D. Flittner, J. Geddes, M. Grutter, J. Herman, D. Jacob, S. Janz, J. Joiner, J. Kim, N. Krotkov, B. Lefer, R. Martin, O. Mayol-Bracero, A. Naeger, M. Newchurch, G. Pfister, K. Pickering, R. Pierce, C. Rivera Cárdenas, A. Saiz-Lopez, W. Simpson, E. Spinei, R. J. Spurr, J. Szykman, O. Torres, J. Wang

Proceedings Volume 11151, 111510B (2019) https://doi.org/10.1117/12.2534883

KEYWORDS: Pollution, Aerosols, Clouds, Atmospheric modeling, Ozone, Satellites, Chemistry, Agriculture, Ultraviolet radiation, Soil science

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Proceedings Article | 25 August 2009 Paper

Paper

Global increases in UVB irradiance from changes in ozone and cloud-aerosol amounts 1979 to 2008

Jay Herman

Proceedings Volume 7462, 746206 (2009) https://doi.org/10.1117/12.828296

KEYWORDS: Ozone, Ultraviolet radiation, Clouds, Reflectivity, Aerosols, Satellites, Roentgenium, Absorption, Linear filtering, Radiative transfer

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Proceedings Article | 25 August 2009 Paper

Paper

The CLEO spectrometer system: first results

N. Abuhassan, A. Cede, J. Herman, N. Krotkov

Proceedings Volume 7462, 74620I (2009) https://doi.org/10.1117/12.828337

KEYWORDS: Spectroscopy, Sun, Diffusers, Sensors, Charge-coupled devices, Head, Ultraviolet radiation, Aerosols, Metals, Visible radiation

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Proceedings Article | 20 August 2009 Paper

Paper

Balloon exoplanet nulling interferometer (BENI)

Richard Lyon, Mark Clampin, Robert Woodruff, Gopal Vasudevan, Holland Ford, Larry Petro, Jay Herman, Stephen Rinehart, Kenneth Carpenter, Joe Marzouk

Proceedings Volume 7440, 74401A (2009) https://doi.org/10.1117/12.827411

KEYWORDS: Planets, Interferometers, Telescopes, Stars, Digital signal processing, Sensors, Exoplanets, Mirrors, Wavefronts, Cameras

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Proceedings Article | 12 August 2009 Paper

Paper

Aerosol column absorption measurements using co-located UV-MFRSR and AERONET CIMEL instruments

N. Krotkov, G. Labow, J. Herman, J. Slusser, R. Tree, G. Janson, B. Durham, T. Eck, B. Holben

Proceedings Volume 7462, 746205 (2009) https://doi.org/10.1117/12.826880

KEYWORDS: Aerosols, Ultraviolet radiation, Calibration, Absorption, Scattering, Visible radiation, Atmospheric modeling, Atmospheric optics, Atmospheric particles, Radiometry

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Proceedings Article | 12 October 2006 Paper

Paper

Validation of TOMS UV irradiance with Brewer ground-based measurements at southwestern Spain

Manuel Antón, Victoria Cachorro, José Vilaplana, Nikolay Krotkov, Antonio Serrano, Carlos Toledano, Benito de la Morena, Jay Herman, María Cancillo

Proceedings Volume 6362, 63622D (2006) https://doi.org/10.1117/12.689921

KEYWORDS: Ultraviolet radiation, Aerosols, Clouds, Satellites, Ozone, Atmospheric particles, Reflectivity, Spectrophotometry, Electroluminescence, Calibration

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Proceedings Article | 10 September 2005 Paper

Paper

Measurements of O3, SO2, NO2 and HCHO column amounts using a Brewer spectrometer

Alexander Cede, Jay Herman

Proceedings Volume 5886, 588602 (2005) https://doi.org/10.1117/12.620167

KEYWORDS: Ozone, Sun, Calibration, Aerosols, Spectroscopy, Gases, Algorithm development, NOx, Atmospheric optics, Optical testing

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Proceedings Article | 10 September 2005 Paper

Paper

Partitioning between aerosol and NO2 absorption in the UV spectral region

N. Krotkov, J. Herman, A. Cede, G. Labow

Proceedings Volume 5886, 588601 (2005) https://doi.org/10.1117/12.615285

KEYWORDS: Aerosols, Absorption, Ultraviolet radiation, NOx, Atmospheric modeling, Visible radiation, Scattering, Atmospheric particles, Ozone, Radiometry

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Proceedings Article | 19 August 2005 Paper

Paper

Long-term UV irradiance changes over Moscow and comparisons with UV estimates from TOMS and METEOSAT

Natalia Chubarova, Yelena Nezval', Jean Verdebout, N. Krotkov, J. Herman

Proceedings Volume 5886, 58860A (2005) https://doi.org/10.1117/12.620303

KEYWORDS: Ultraviolet radiation, Aerosols, Clouds, Atmospheric modeling, Satellites, Data modeling, Ozone, UV optics, Reflectivity, Calibration

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We analyzed long-term variations of UV irradiance 300-380 nm over Moscow 55.7N, 37.5E since 1968 using a complex dataset that includes ground-based UV measurements, UV retrievals from two satellites, and the results of a previously developed empirical model. Long-term interannual changes of UV irradiance, 300-380nm, during 1968-2003 show the absence of any linear trends although an increase is detected in the late 90-s due to cloud amount and aerosol content decrease. The ground-based data are compared with UV satellite retrievals from two independent methods as well as with the results of an empirical model that accounts for the physical dependence of UV on cloud parameters (amount and optical thickness), surface albedo, total ozone, and aerosol properties of the atmosphere. UV datasets over Moscow obtained from different satellite instruments: from the Total Ozone Mapping Spectrometer (TOMS) data (version 8) since 1979 and from METEOSAT/MVIRI since 1984. The original METEOSAT processor, using visibility observations at a nearby meteorological station to quantify the aerosol load, leads to a significant underestimation of the UV daily doses (-23% in warm period and -31% in cold period). Substituting the visibility observations by in situ monthly mean aerosol optical depth improves significantly the agreement in both warm and cold periods (respectively, -9% and -10%) but the bias still remains. The difference between TOMS UV retrievals and ground-based data has different signs in warm (+6%) and cold (-15%) periods. Applying off-line absorbing aerosol correction in TOMS UV retrievals eliminates the positive bias in warm period. The negative bias during the cold period can be due to the application of minimum Lambertian effective reflectivity (MLER) approach to determine the surface albedo especially in conditions with non stable snow cover (end of February- March, and November-December). Model reconstruction of UV variability demonstrates high correlation with aerosol corrected satellite UV retrievals (0.83-0.94) as well as with ground data (0.82) during warm period. During cold months the correlation between satellite UV retrievals and ground-based measurements is much worse.

SPIE Journal Paper | 1 April 2005

Aerosol ultraviolet absorption experiment (2002 to 2004), part 1: ultraviolet multifilter rotating shadowband radiometer calibration and intercomparison with CIMEL sunphotometers

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gordon Labow, Gwendolyn Scott, George Janson, Tom Eck, Brent Holben

OE, Vol. 44, Issue 04, 041004, (April 2005) https://doi.org/10.1117/12.10.1117/1.1886818

KEYWORDS: Calibration, Aerosols, Ultraviolet radiation, Absorption, Ozone, Diffusers, Atmospheric modeling, Atmospheric optics, Sun, Radiometry

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SPIE Journal Paper | 1 April 2005

Aerosol ultraviolet absorption experiment (2002 to 2004), part 2: absorption optical thickness, refractive index, and single scattering albedo

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gwendolyn Scott, Gordon Labow, Alexander Vasilkov, Tom Eck, Oleg Doubovik, Brent Holben

OE, Vol. 44, Issue 04, 041005, (April 2005) https://doi.org/10.1117/12.10.1117/1.1886819

KEYWORDS: Aerosols, Ultraviolet radiation, Absorption, Refractive index, Atmospheric modeling, Ozone, Atmospheric particles, Calibration, Visible radiation, Scattering

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SPIE Journal Paper | 1 April 2005 Open Access

Open Access

Editorial: Advances in UV Ground- and Space-based Measurements and Modeling II

James Slusser, Wei Gao, Jay Herman

OE, Vol. 44, Issue 04, 041001, (April 2005) https://doi.org/10.1117/12.10.1117/1.1885026

Proceedings Article | 14 October 2004 Paper

Paper

Measuring aerosol UV absorption optical thickness by combining use of shadowband and almucantar techniques

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gwen Scott, Gordon Labow, Alexander Vasilkov, Thomas Eck, Oleg Dubovik, Brent Holben

Proceedings Volume 5545, (2004) https://doi.org/10.1117/12.559557

KEYWORDS: Aerosols, Ultraviolet radiation, Absorption, Refractive index, Visible radiation, Scattering, Ozone, Radiometry, Calibration, Atmospheric modeling

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We report final results of an aerosol UV absorption closure experiment where a UV-shadow-band radiometer (UV-MFRSR, USDA UVB Monitoring and Research Network) and 4 rotating sun-sky radiometers (CIMEL, NASA AERONET network) were run side-by-side continuously for 17 months at NASA/GSFC site in Greenbelt, MD. The aerosol extinction optical thickness τ_ext, was measured by the CIMEL direct-sun technique in the visible and at two UV wavelengths 340 and 380 nm. These results were used for UV-MFRSR daily on-site calibration and 3-min measurements of τ_ext at 325nm, 332nm and 368nm. The τ_ext measurements were used as input to the radiative transfer model along with AERONET retrievals of the column-integrated particle size distribution (PSD)to infer an effective imaginary part of the UV aerosol refractive index, k, by fitting MFRSR measured voltage ratios. Using all cases for cloud-free days, we derive diurnal and seasonal dependence of the aerosol absorption optical thickness, τ_abs with an uncertainty 0.01-0.02. At our site τ_abs follows pronounced seasonal dependence with maximum values ~0.07 at 368nm (~0.15 at 325nm) occurring in summer hazy conditions and <0.02 in winter-fall seasons, when aerosol loadings are small. Inferred values of k allow calculation of the single scattering albedo, ω, in UVA and comparisons with AERONET almucantar ω₄₄₀ retrievals at 440nm. Overall, ω was slightly lower in UV than in the visible: case average <ω₃₆₈>=0.93 compared to <ω₄₄₀>=0.95. However, the differences (<ω₄₄₀ - ω₃₆₈> ~0.02, rms difference ~0.016) are smaller than uncertainties of both retrievals (δω~0.03). Low <ω₃₆₈> values are consistent with higher values for imaginary refractive index, k: <k₃₆₈> ~0.01 compare to <k₄₄₀> ~0.006. However, mean differences in k (<k₃₆₈-k₄₄₀>~0.004) were only slightly larger than AERONET retrieval uncertainty δk ~0.003²⁷. We also found that ω decreases with decrease in τ_ext, suggesting different aerosol composition in summer and winter months. So far, our results do not allow explaining the causes of apparent larger aerosol absorption in UV. Continuing co-located measurements at GFSC is important to improve the comparison statistics, but conducting aerosol absorption measurements at different sites with varying conditions is also desirable.

Proceedings Article | 14 October 2004 Paper

Paper

The effect of polarization sensitivity of Brewer spectrometers on Direct Sun measurements

Alexander Cede, Gordon Labow, Matthew Kowalewski, Jay Herman

Proceedings Volume 5545, (2004) https://doi.org/10.1117/12.572430

KEYWORDS: Polarization, Quartz, Sun, Quantum wells, Polarizers, Spectrometers, Solids, Aerosols, Optical components, Prisms

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Proceedings Article | 14 October 2004 Paper

Paper

Assessment of TOMS UV bias due to absorbing aerosols

Antti Arola, Stelios Kazadzis, Nickolay Krotkov, Alkis Bais, Jay Herman, Kaisa Lakkala

Proceedings Volume 5545, (2004) https://doi.org/10.1117/12.558691

KEYWORDS: Aerosols, Ultraviolet radiation, Absorption, Artificial intelligence, Clouds, Satellites, Reflectivity, Calibration, Atmospheric modeling, Evolutionary algorithms

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Proceedings Article | 12 October 2004 Paper

Paper

Solar viewing interferometer prototype

Richard Lyon, Jay Herman, Nader Abuhassan, Catherine Marx, Semion Kizhner, Julie Crooke, Ronald Toland, Albert Mariano, Cheryl Salerno, Gary Brown, Tony Cazeau, Peter Petrone, Billy Mamakos, Severine Tournois

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.552237

KEYWORDS: Sensors, Space telescopes, Telescopes, Mirrors, Digital signal processing, Beam splitters, Interferometers, Wavefronts, Control systems, Prototyping

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Proceedings Article | 4 November 2003 Paper

Paper

Estimating UV index climatology over North America

Vitali Fioletov, James Kerr, L. J. McArthur, David Wardle, Tom Mathews, Michael Kimlin, Richard Meltzer, Nickolay Krotkov, Jay Herman

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.505921

KEYWORDS: Ultraviolet radiation, Ozone, Climatology, Solar radiation, Aerosols, Reflectivity, Satellites, Clouds, Pollution, Data analysis

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Proceedings Article | 4 November 2003 Paper

Paper

Seasonal variation of UV radiation in the ocean under clear and cloudy conditions

Ziauddin Ahmad, Jay Herman, Alexander Vasilkov, Maria Tzortziou, B. Mitchell, Mati Kahru

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.505298

KEYWORDS: Clouds, Ozone, Ultraviolet radiation, Absorption, Aerosols, Reflectivity, Atmospheric particles, Radiative transfer, Ocean optics, Scattering

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Proceedings Article | 4 November 2003 Paper

Paper

Goddard UV aerosol absorption closure experiment (2002-03)

Nickolay Krotkov, Pawan Bhartia, Jay Herman, James Slusser, Gwendolyn Scott, Gordon Labow, Alexander Vasilkov, Tom Eck, Oleg Dubovik, Brent Holben

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.508967

KEYWORDS: Aerosols, Ultraviolet radiation, Refractive index, Clouds, Absorption, Atmospheric modeling, Scattering, Calibration, Atmospheric particles, Radiometry

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Proceedings Article | 4 November 2003 Paper

Paper

A model for the assessment of UV penetration into ocean waters from space-based measurements and full radiative transfer calculations

Alexander Vasilkov, Jay Herman, Ziauddin Ahmad, B. Mitchell, Mati Kahru

Proceedings Volume 5156, (2003) https://doi.org/10.1117/12.506030

KEYWORDS: Atmospheric modeling, Ultraviolet radiation, Absorption, Data modeling, Reflectivity, Signal attenuation, Water, Clouds, Scattering, Radiative transfer

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Proceedings Article | 1 July 2003 Paper

Paper

Spectrally resolved comparison of TOMS estimates of surface UV irradiances with those of ground-based measurements at time of overpass

Michael Kimlin, Thomas Taylor, Jay Herman, John Rives, Blake Cannon, Richard Meltzer

Proceedings Volume 4896, (2003) https://doi.org/10.1117/12.466187

KEYWORDS: Ultraviolet radiation, Deep ultraviolet, Ozone, Clouds, Calibration, Satellites, Time metrology, Lamps, Stray light, Statistical analysis

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Proceedings Article | 1 July 2003 Paper

Paper

Effect of aerosol on UV radiation: an overview

N. Hsu, Jay Herman, Brent Holben

Proceedings Volume 4896, (2003) https://doi.org/10.1117/12.466137

KEYWORDS: Aerosols, Ultraviolet radiation, Atmospheric modeling, Satellites, Ozone, Signal attenuation, Atmospheric particles, Clouds, Radiation effects, Absorption

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Proceedings Article | 1 July 2003 Paper

Paper

Possible changes in reflectivity of the Earth at 360 nm: 1980–2001

Jay Herman

Proceedings Volume 4896, (2003) https://doi.org/10.1117/12.466130

KEYWORDS: Reflectivity, Clouds, Calibration, Aerosols, Ultraviolet radiation, Absorption, Solar processes, Ozone, Satellites, Statistical analysis

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SPIE Journal Paper | 1 December 2002

Comparisons between ground measurements of broadband ultraviolet irradiance (300 to 380 nm) and total ozone mapping spectrometer ultraviolet estimates at Moscow for 1979 to 2000

Nataly Chubarova, Alla Yurova, Nickolay Krotkov, Jay Herman, Pawan Bhartia

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1516819

KEYWORDS: Ultraviolet radiation, Aerosols, Clouds, Molybdenum, Satellites, Line edge roughness, UV optics, Ozone, Radiometry, Reflectivity

SPIE Journal Paper | 1 December 2002

Version 2 total ozone mapping spectrometer ultraviolet algorithm: problems and enhancements

Nickolay Krotkov, Jay Herman, Pawan Bhartia, Colin Seftor, Antti Arola, Jussi Kaurola, S. Kalliskota, Petteri Taalas, Igor Geogdzhayev

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1519541

KEYWORDS: Clouds, Ultraviolet radiation, Aerosols, Satellites, Atmospheric modeling, Reflectivity, Data modeling, Ozone, Spectroscopy, 3D modeling

SPIE Journal Paper | 1 December 2002

Problems in assessment of the ultraviolet penetration into natural waters from space-based measurements

Alexander Vasilkov, Jay Herman, Nickolay Krotkov, Mati Kahru, Brian Mitchell, Christina Hsu

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1516822

KEYWORDS: Ultraviolet radiation, Absorption, Atmospheric modeling, Clouds, Aerosols, Data modeling, Visible radiation, Satellites, Optical properties, Water

SPIE Journal Paper | 1 December 2002

Comparison of Brewer ultraviolet irradiance measurements with total ozone mapping spectrometer satellite retrievals

Vitali Fioletov, James Kerr, David Wardle, Nickolay Krotkov, Jay Herman

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1516818

KEYWORDS: Ultraviolet radiation, Clouds, Ozone, Aerosols, Reflectivity, Satellites, Absorption, Atmospheric modeling, Transmittance, Error analysis

Proceedings Article | 17 January 2002 Paper

Paper

Comparisons between ground measurements of UV irradiance 290 to 380nm and TOMS UV estimates over Moscow for 1979-2000

Nataly Chubarova, Alla Yurova, Nickolay Krotkov, Jay Herman, Pawan Bhartia

Proceedings Volume 4482, (2002) https://doi.org/10.1117/12.452945

KEYWORDS: Ultraviolet radiation, Clouds, Aerosols, Satellites, Line edge roughness, Atmospheric modeling, Reflectivity, Molybdenum, Atmospheric particles, Error analysis

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Proceedings Article | 17 January 2002 Paper

Paper

Comparison of Brewer UV irradiance measurements with TOMS satellite retrievals

Vitali Fioletov, James Kerr, David Wardle, Nickolay Krotkov, Jay Herman

Proceedings Volume 4482, (2002) https://doi.org/10.1117/12.452952

KEYWORDS: Ultraviolet radiation, Clouds, Satellites, Aerosols, Ozone, Transmittance, Data modeling, Reflectivity, Atmospheric modeling, Meteorology

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Proceedings Article | 17 January 2002 Paper

Paper

Version 2 TOMS UV algorithm: problems and enhancements

Nickolay Krotkov, Jay Herman, Pawan Bhartia, Colin Seftor, Antti Arola, Jussi Kaurola, Lasse Koskinen, S. Kalliskota, Petteri Taalas, Igor Geogdzhaev

Proceedings Volume 4482, (2002) https://doi.org/10.1117/12.452956

KEYWORDS: Clouds, Ultraviolet radiation, Aerosols, Satellites, Reflectivity, Data modeling, Atmospheric modeling, Evolutionary algorithms, Signal attenuation, Ozone

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Proceedings Article | 17 January 2002 Paper

Paper

Problems in assessment of the UV penetration into natural waters from space-based measurements

Alexander Vassilkov, Jay Herman, Nickolay Krotkov, B. Greg Mitchell, Mati Kahru

Proceedings Volume 4482, (2002) https://doi.org/10.1117/12.452912

KEYWORDS: Ultraviolet radiation, Absorption, Atmospheric modeling, Clouds, Satellites, Data modeling, Visible radiation, Radiative transfer, Optical properties, Water

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Proceedings Article | 17 January 2002 Paper

Paper

Comparisons of USDA UV shadow-band irradiance measurements with TOMS satellite and DISORT model retrievels under all sky conditions

James Slusser, Nickolay Krotkov, Wei Gao, Jay Herman, Gordon Labow, Gwen Scott

Proceedings Volume 4482, (2002) https://doi.org/10.1117/12.452954

KEYWORDS: Aerosols, Ultraviolet radiation, Clouds, Atmospheric modeling, Satellites, Ozone, Radiometry, Calibration, Signal attenuation, Head

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Proceedings Article | 28 December 1999 Paper

Paper

Prelaunch tests for the calibration of Total Ozone Mapping Spectrometer (TOMS) flight model 5 (FM-5)

Hongwoo Park, F. Cunningham, Jay Herman, Richard McPeters, Pawan Bhartia, Ulli Hartmann, Robert Haring

Proceedings Volume 3870, (1999) https://doi.org/10.1117/12.373203

KEYWORDS: Calibration, Diffusers, Ozone, Free electron lasers, Monochromators, Optical spheres, Satellites, Polarization, Sensors, Lamps

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Proceedings Article | 21 December 1998 Paper

Paper

Joint Russian-USA Meteor-3M(2)/TOMS-5 mission

Hongwoo Park, Shahid Habib, F. Cunningham, Jay Herman, Pawan Bhartia, Rashid Salikhov, Albert Chernikov

Proceedings Volume 3498, (1998) https://doi.org/10.1117/12.333659

KEYWORDS: Ozone, Space operations, Diffusers, Interfaces, Control systems, Spectroscopy, Data processing, Calibration, Satellites, Aerosols

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Showing 5 of 34 publications

Proceedings Volume Editor (6)

SPIE Conference Volume | 11 August 2009

Ultraviolet and Visible Ground- and Space-based Measurements, Trace Gases, Aerosols and Effects VI

SPIE Conference Volume | 18 August 2005

Ultraviolet Ground- and Space-based Measurements, Models, and Effects V

SPIE Conference Volume | 14 October 2004

Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV

SPIE Conference Volume | 4 November 2003

Ultraviolet Ground- and Space-based Measurements, Models, and Effects III

SPIE Conference Volume | 1 July 2003

Ultraviolet Ground- and Space-based Measurements, Models, and Effects II

Showing 5 of 6 publications

Conference Committee Involvement (6)

Ultraviolet and Visible Ground- and Space-based Measurements, Trace Gases, Aerosols and Effects VI

3 August 2009 | San Diego, California, United States

Ultraviolet Ground- and Space-based Measurements, Models, and Effects V

31 July 2005 | San Diego, California, United States

Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV

5 August 2004 | Denver, Colorado, United States

Ultraviolet Ground- and Space-based Measurements, Models, and Effects III

4 August 2003 | San Diego, California, United States

Ultraviolet Ground- and Space-based Measurements, Models, and Effects II

25 October 2002 | Hangzhou, China

Showing 5 of 6 Conference Committees

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