Dr. Amir Ibrahim is a scientist at the Ocean Ecology Lab (OEL) at NASA Goddard Space Flight Center (GSFC) and he leads the atmospheric correction algorithm development for NASA's Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) mission. Dr. Ibrahim is a member of the PACE project science team and his research activities involve developing and evaluating atmospheric correction methods for derivation of ocean color from the Ocean Color Instrument (OCI) combined with multi-angle polarimeters (SPEXone and HARP2)
Dr. Ibrahim obtained his PhD. degree in February 2015 from the Electrical Engineering Dept. at the City College of the City University of New York (CCNY). His doctoral dissertation focused on ocean color remote sensing using polarimetric observation of light. He developed an inversion algorithm (c/a algorithm) based on Vector Radiative Transfer (VRT) models to retrieve macro- and micro-physical properties of oceanic hydrosols that helps in improving our understandings of the ocean geochemical properties and carbon cycle, in addition to improving the estimates of global chlorophyll and suspended minerals concentrations.
Vector Radiative Transfer modeling, polarimetric remote sensing, hyperspectral remote sensing
• Inversion of the vector radiative transfer equation in the coupled ocean-atmosphere system.
• Retrieval of useful optical and microphysical properties of aerosols/hydrosols using the polarization of light.
• Improvement of atmospheric correction procedures for ocean color remote sensing.
• Assessment of the impact of atmospheric aerosols on the observed spectral scalar and polarized radiance at both sea surface level and at top of the atmosphere.
• Hyperspectral data processing and analysis of underwater, shipborne, airborne, and satellite measurements.
Plankton, Aerosol, Cloud, and ocean Ecosystem (PACE)
Develop and evaluate atmospheric correction methods for derivation of ocean color from a hyperspectral space-borne and air-borne radiometer and combined multi-angle polarimeter.
The Hyperspectral Imager for the Coastal Ocean (HICO)
Develop and validate a hyperspectral atmospheric correction algorithm of molecular and aerosol scattering and compensate for gaseous absorption in the atmosphere (such as water vapor, oxygen, and ozone) for the HICO sensor in order to retrieve a hyperspectral remote sensing reflectance to derive ocean color products.
3/2021
-
Present
Research Oceanographer
Ocean Ecology Laboratory, NASA Goddard Space Flight Center,
Greenbelt, MD
7/2018
-
3/2021
Senior Research Scientist - Atmospheric Correction PACE Project Science Lead
SSAI,
NASA GSFC, Greenbelt, MD
3/2017
-
7/2018
Research Scientist
Universities Space Research Association (USRA) / NASA GSFC,
Greenbelt, MD Atmospheric correction for Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission
6/2015
-
3/2017
Postdoctoral Researcher
Universities Space Research Association (USRA) / NASA GSFC,
Greenbelt Support of the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission's Science Team activities to develop and evaluate atmospheric correction methods for derivation of ocean color from a hyperspectral radiometer and combined multi-angle polarimeter.
1/2015
-
6/2015
Postdoctoral Researcher
Research Foundation of The City University of New York,
New York, NY Polarimetric remote sensing algorithm development and validation with in-situ optics
PhD. in Electrical Engineering, CCNY
Bachelor of Electrical Engineering, CCNY
American Geophysical Union,
2015
-
Present
Institute of Electrical and Electronics Engineers,
2009
-
Present
• Honorary Mention awarded for Best Student Paper titled “Retrievals of the Attenuation and Scattering Coefficients of Marine Particles Using the Polarization of Light” from the oceanography society at the Ocean Optics 2014 conference, Portland, Maine.
• Certificate of Distinguished Achievement in Academic Excellence, NOAA-CREST Institute, 2013, The City College of New York.
• Honorary Mention awarded for Best Student Paper titled “The Relationship between Upwelling Polarized Radiance and In-Water Attenuation to Absorption Ratio” from the oceanography society at the Ocean Optics 2012 conference, Glasgow, Scotland.
• Graduate Teaching Fellowship, 2011-2013.
10/12/2017 -
10/09/2020
Remote Sensing of Water Quality,
UMBC, NASA NRA #: NNH16ZDA001N-RSWQ
Atmospheric correction for complex scenes using co-located polarimetric and ocean color observations.
;
Co-I
;
0.1 FTE
01/31/2018
The Science of TERRA, AQUA, and SUOMI NPP,
NASA
Advancing the Quality and Continuity of Marine Remote Sensing Reflectance and Derived Ocean Color Products from MODIS to VIIRS
;
Co-I
01/31/2018
The Science of TERRA, AQUA, and SUOMI NPP,
NASA
Joint MISR/MODIS ocean color atmospheric correction with a new algorithm that utilizes reflected sun glint
;
Co-I
Refereed
Gao, M., K. Knobelspiesse, B. Franz, et al. 2022. "Effective uncertainty quantification for multi-angle polarimetric aerosol remote sensing over ocean."
Atmos. Meas. Tech.,
15
(16):
4859–4879
[10.5194/amt-15-4859-2022]
Zhang, M., A. Ibrahim, B. A. Franz, Z. Ahmad, and A. M. Sayer. 2022. "Estimating pixel-level uncertainty in ocean color retrievals from MODIS."
Optics Express,
30
(17):
31415
[10.1364/oe.460735]
Ibrahim, A., B. Franz, A. Sayer, et al. 2022. "Optimal Estimation Framework for Ocean Color Atmospheric Correction and Pixel-level Uncertainty Quantification."
Applied Optics,
Vol. 61 No. 20:
[10.1364/ao.461861]
Gilerson, A., E. Herrera-Estrella, R. Foster, et al. 2022. "Determining the Primary Sources of Uncertainty in Retrieval of Marine Remote Sensing Reflectance From Satellite Ocean Color Sensors."
Frontiers in Remote Sensing,
3:
[10.3389/frsen.2022.857530]
Zhai, P.-W., M. Gao, B. A. Franz, et al. 2022. "A Radiative Transfer Simulator for PACE: Theory and Applications."
Frontiers in Remote Sensing,
3:
[10.3389/frsen.2022.840188]
Gao, M., K. Knobelspiesse, B. A. Franz, et al. 2021. "Adaptive Data Screening for Multi-Angle Polarimetric Aerosol and Ocean Color Remote Sensing Accelerated by Deep Learning."
Frontiers in Remote Sensing,
2:
[10.3389/frsen.2021.757832]
Korkin, S., A. Sayer, A. Ibrahim, and A. Lyapustin. 2021. "A practical guide to writing a radiative transfer code."
Computer Physics Communications,
271:
108198
[10.1016/j.cpc.2021.108198]
Bisson, K. M., E. Boss, P. J. Werdell, et al. 2021. "Seasonal bias in global ocean color observations."
Applied Optics,
60
(23):
6978
[10.1364/ao.426137]
Gao, M., B. A. Franz, K. Knobelspiesse, et al. 2021. "Efficient multi-angle polarimetric inversion of aerosols and oceancolor powered by a deep neural network forward model."
Atmospheric Measurement Techniques,
14
(6):
4083–4110
[https://doi.org/10.5194/amt-14-4083-2021]
Knobelspiesse, K., A. Ibrahim, B. Franz, et al. 2021. "Analysis of simultaneous aerosol and ocean glint retrieval using multi-angle observations."
Atmospheric Measurement Techniques,
14:
3233-3252
[10.5194/amt-14-3233-2021]
Hannadige, N. K., P.-W. Zhai, M. Gao, et al. 2021. "Atmospheric correction over the ocean for hyperspectral radiometers using multi-angle polarimetric retrievals."
Optics Express,
29
(3):
4504
[10.1364/oe.408467]
Bisson, K. M., E. Boss, P. J. Werdell, A. Ibrahim, and M. J. Behrenfeld. 2020. "Particulate backscattering in the global ocean: A comparison of independent assessments."
Geophysical Research Letters,
[10.1029/2020gl090909]
Gao, M., P.-W. Zhai, B. A. Franz, et al. 2020. "Inversion of multiangular polarimetric measurements from the ACEPOL campaign: an application of improving aerosol property and hyperspectral ocean color retrievals."
Atmospheric Measurement Techniques,
13:
3939–3956
[10.5194/amt-13-3939-2020]
Gilerson, A., C. Carrizo, A. Ibrahim, et al. 2020. "Hyperspectral polarimetric imaging of the water surface and retrieval of water optical parameters from multi-angular polarimetric data."
Applied Optics,
59
(10):
C8
[10.1364/ao.59.0000c8]
Frouin, R. J., B. A. Franz, A. Ibrahim, et al. 2019. "Atmospheric Correction of Satellite Ocean-Color Imagery During the PACE Era."
Frontiers in Earth Science,
7:
[10.3389/feart.2019.00145]
Remer, L. A., K. Knobelspiesse, P.-W. Zhai, et al. 2019. "Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry."
Frontiers in Environmental Science,
7:
[10.3389/fenvs.2019.00094]
Remer, L. A., A. B. Davis, S. Mattoo, et al. 2019. "Retrieving Aerosol Characteristics From the PACE Mission, Part 1: Ocean Color Instrument."
Frontiers in Earth Science,
7:
[10.3389/feart.2019.00152]
Gao, M., P.-W. Zhai, B. A. Franz, et al. 2019. "Inversion of multi-angular polarimetric measurements over open and coastal ocean waters: a joint retrieval algorithm for aerosol and water leaving radiance properties."
Atmospheric Measurement Techniques,
12
(7):
3921–3941
[10.5194/amt-12-3921-2019]
Chowdhary, J., P. Zhai, E. Boss, et al. 2019. "Modeling Atmosphere-Ocean Radiative Transfer: A PACE Mission Perspective."
Frontiers in Earth Science,
7:
100 pp.
[10.3389/feart.2019.00100]
Ibrahim, A., B. A. Franz, Z. Ahmad, and S. W. Bailey. 2019. "Multiband Atmospheric Correction Algorithm for Ocean Color Retrievals."
Frontiers in Earth Science,
7:
[10.3389/feart.2019.00116]
Jamet, C., A. Ibrahim, Z. Ahmad, et al. 2019. "Going Beyond Standard Ocean Color Observations: Lidar and Polarimetry."
Frontiers in Marine Science,
6:
[10.3389/fmars.2019.00251]
Gao, M., P.-W. Zhai, B. Franz, et al. 2018. "Retrieval of aerosol properties and water-leaving reflectance from multi-angular polarimetric measurements over coastal waters."
Optics Express,
26
(7):
8968
[10.1364/oe.26.008968]
Ottaviani, M., R. Foster, A. Gilerson, et al. 2018. "Airborne and shipborne polarimetric measurements over open ocean and coastal waters: Intercomparisons and implications for spaceborne observations."
Remote Sensing of Environment,
206:
375-390
[10.1016/j.rse.2017.12.015]
Ibrahim, A., B. Franz, Z. Ahmad, et al. 2018. "Atmospheric correction for hyperspectral ocean color retrieval with application to the Hyperspectral Imager for the Coastal Ocean (HICO)."
Remote Sensing of Environment,
204:
60-75
[10.1016/j.rse.2017.10.041]
Zhai, P.-W., K. Knobelspiesse, A. Ibrahim, et al. 2017. "Water-leaving contribution to polarized radiation field over ocean."
Optics Express,
25
(16):
A689
[10.1364/oe.25.00a689]
Ibrahim, A., A. Gilerson, J. Chowdhary, and S. Ahmed. 2016. "Retrieval of macro- and micro-physical properties of oceanic hydrosols from polarimetric observations."
Remote Sensing of Environment,
186:
548-566
[10.1016/j.rse.2016.09.004]
Gu, Y., C. Carrizo, A. A. Gilerson, et al. 2016. "Polarimetric imaging and retrieval of target polarization characteristics in underwater environment."
Applied Optics,
55
(3):
626--637
[10.1364/AO.55.000626]
Brady, P. C., A. A. Gilerson, G. W. Kattawar, et al. 2015. "Open-ocean fish reveal an omnidirectional solution to camouflage in polarized environments."
Science,
350
(6263):
965-969
[10.1126/science.aad5284]
Ibrahim, A., A. Gilerson, T. Harmel, et al. 2012. "The relationship between upwelling underwater polarization and attenuation/absorption ratio."
Opt. Express,
20
(23):
25,662-25,680
[10.1364/OE.20.025662]
Tonizzo, A., A. Gilerson, T. Harmel, et al. 2011. "Estimating particle composition and size distribution from polarized water-leaving radiance."
Applied Optics,
50
(25):
5047-5058
[10.1364/AO.50.005047]
Non-Refereed
Foster, R., A. Ibrahim, A. Gilerson, et al. 2015. "Polarized above sea surface hyperspectral observations and their relationship with measured water properties."
Hyperspectral Imaging and Sounding of the Environment
HT3B--4.
Gilerson, A., C. Carrizo, A. Tonizzo, et al. 2013. "Polarimetric imaging of underwater targets."
SPIE Defense, Security, and Sensing
872403--872403.
Ahmed, S., A. Tonizzo, A. Ibrahim, et al. 2012. "Algal fluorescence: impact and potential for retrieval from measurements of the underwater degree of polarization."
SPIE Remote Sensing
85320I--85320I.
Gilerson, A., A. Ibrahim, T. Harmel, A. Tonizzo, and S. Ahmed. 2012. "Polarization techniques for the retrieval of water parameters from above and below water polarimetric observations."
Proc. of SPIE Vol
8372:
83720T--1.
Harmel, T., A. Tonizzo, A. Ibrahim, et al. 2011. "Measuring underwater polarization field from above-water hyperspectral instrumentation for water composition retrieval."
SPIE Remote Sensing
817509--817509.
Ibrahim, A., T. Harmel, A. Tonizzo, et al. 2011. "Exploring the relation between polarized light fields and physical-optical characteristics of the ocean for Remote Sensing applications."
SPIE Optical Engineering+ Applications
81600H--81600H.
Hlaing, S., T. Harmel, A. Ibrahim, et al. 2010. "Validation of ocean color satellite sensors using coastal observational platform in Long Island Sound."
Remote Sensing
782504--782504.
Refereed
Gao, M., K. Knobelspiesse, B. Franz, et al. 2022. "Effective uncertainty quantification for multi-angle polarimetric aerosol remote sensing over ocean."
Atmos. Meas. Tech.
15
(16):
4859–4879
[10.5194/amt-15-4859-2022]
Zhang, M., A. Ibrahim, B. A. Franz, Z. Ahmad, and A. M. Sayer. 2022. "Estimating pixel-level uncertainty in ocean color retrievals from MODIS."
Optics Express
30
(17):
31415
[10.1364/oe.460735]
Ibrahim, A., B. Franz, A. Sayer, et al. 2022. "Optimal Estimation Framework for Ocean Color Atmospheric Correction and Pixel-level Uncertainty Quantification."
Applied Optics
Vol. 61 No. 20
[10.1364/ao.461861]
Gilerson, A., E. Herrera-Estrella, R. Foster, et al. 2022. "Determining the Primary Sources of Uncertainty in Retrieval of Marine Remote Sensing Reflectance From Satellite Ocean Color Sensors."
Frontiers in Remote Sensing
3
[10.3389/frsen.2022.857530]
Zhai, P.-W., M. Gao, B. A. Franz, et al. 2022. "A Radiative Transfer Simulator for PACE: Theory and Applications."
Frontiers in Remote Sensing
3
[10.3389/frsen.2022.840188]
Gao, M., K. Knobelspiesse, B. A. Franz, et al. 2021. "Adaptive Data Screening for Multi-Angle Polarimetric Aerosol and Ocean Color Remote Sensing Accelerated by Deep Learning."
Frontiers in Remote Sensing
2
[10.3389/frsen.2021.757832]
Korkin, S., A. Sayer, A. Ibrahim, and A. Lyapustin. 2021. "A practical guide to writing a radiative transfer code."
Computer Physics Communications
271
108198
[10.1016/j.cpc.2021.108198]
Bisson, K. M., E. Boss, P. J. Werdell, et al. 2021. "Seasonal bias in global ocean color observations."
Applied Optics
60
(23):
6978
[10.1364/ao.426137]
Gao, M., B. A. Franz, K. Knobelspiesse, et al. 2021. "Efficient multi-angle polarimetric inversion of aerosols and oceancolor powered by a deep neural network forward model."
Atmospheric Measurement Techniques
14
(6):
4083–4110
[https://doi.org/10.5194/amt-14-4083-2021]
Knobelspiesse, K., A. Ibrahim, B. Franz, et al. 2021. "Analysis of simultaneous aerosol and ocean glint retrieval using multi-angle observations."
Atmospheric Measurement Techniques
14
3233-3252
[10.5194/amt-14-3233-2021]
Hannadige, N. K., P.-W. Zhai, M. Gao, et al. 2021. "Atmospheric correction over the ocean for hyperspectral radiometers using multi-angle polarimetric retrievals."
Optics Express
29
(3):
4504
[10.1364/oe.408467]
Bisson, K. M., E. Boss, P. J. Werdell, A. Ibrahim, and M. J. Behrenfeld. 2020. "Particulate backscattering in the global ocean: A comparison of independent assessments."
Geophysical Research Letters
[10.1029/2020gl090909]
Gao, M., P.-W. Zhai, B. A. Franz, et al. 2020. "Inversion of multiangular polarimetric measurements from the ACEPOL campaign: an application of improving aerosol property and hyperspectral ocean color retrievals."
Atmospheric Measurement Techniques
13
3939–3956
[10.5194/amt-13-3939-2020]
Gilerson, A., C. Carrizo, A. Ibrahim, et al. 2020. "Hyperspectral polarimetric imaging of the water surface and retrieval of water optical parameters from multi-angular polarimetric data."
Applied Optics
59
(10):
C8
[10.1364/ao.59.0000c8]
Frouin, R. J., B. A. Franz, A. Ibrahim, et al. 2019. "Atmospheric Correction of Satellite Ocean-Color Imagery During the PACE Era."
Frontiers in Earth Science
7
[10.3389/feart.2019.00145]
Remer, L. A., K. Knobelspiesse, P.-W. Zhai, et al. 2019. "Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry."
Frontiers in Environmental Science
7
[10.3389/fenvs.2019.00094]
Remer, L. A., A. B. Davis, S. Mattoo, et al. 2019. "Retrieving Aerosol Characteristics From the PACE Mission, Part 1: Ocean Color Instrument."
Frontiers in Earth Science
7
[10.3389/feart.2019.00152]
Gao, M., P.-W. Zhai, B. A. Franz, et al. 2019. "Inversion of multi-angular polarimetric measurements over open and coastal ocean waters: a joint retrieval algorithm for aerosol and water leaving radiance properties."
Atmospheric Measurement Techniques
12
(7):
3921–3941
[10.5194/amt-12-3921-2019]
Chowdhary, J., P. Zhai, E. Boss, et al. 2019. "Modeling Atmosphere-Ocean Radiative Transfer: A PACE Mission Perspective."
Frontiers in Earth Science
7
100 pp.
[10.3389/feart.2019.00100]
Ibrahim, A., B. A. Franz, Z. Ahmad, and S. W. Bailey. 2019. "Multiband Atmospheric Correction Algorithm for Ocean Color Retrievals."
Frontiers in Earth Science
7
[10.3389/feart.2019.00116]
Jamet, C., A. Ibrahim, Z. Ahmad, et al. 2019. "Going Beyond Standard Ocean Color Observations: Lidar and Polarimetry."
Frontiers in Marine Science
6
[10.3389/fmars.2019.00251]
Gao, M., P.-W. Zhai, B. Franz, et al. 2018. "Retrieval of aerosol properties and water-leaving reflectance from multi-angular polarimetric measurements over coastal waters."
Optics Express
26
(7):
8968
[10.1364/oe.26.008968]
Ottaviani, M., R. Foster, A. Gilerson, et al. 2018. "Airborne and shipborne polarimetric measurements over open ocean and coastal waters: Intercomparisons and implications for spaceborne observations."
Remote Sensing of Environment
206
375-390
[10.1016/j.rse.2017.12.015]
Ibrahim, A., B. Franz, Z. Ahmad, et al. 2018. "Atmospheric correction for hyperspectral ocean color retrieval with application to the Hyperspectral Imager for the Coastal Ocean (HICO)."
Remote Sensing of Environment
204
60-75
[10.1016/j.rse.2017.10.041]
Zhai, P.-W., K. Knobelspiesse, A. Ibrahim, et al. 2017. "Water-leaving contribution to polarized radiation field over ocean."
Optics Express
25
(16):
A689
[10.1364/oe.25.00a689]
Ibrahim, A., A. Gilerson, J. Chowdhary, and S. Ahmed. 2016. "Retrieval of macro- and micro-physical properties of oceanic hydrosols from polarimetric observations."
Remote Sensing of Environment
186
548-566
[10.1016/j.rse.2016.09.004]
Gu, Y., C. Carrizo, A. A. Gilerson, et al. 2016. "Polarimetric imaging and retrieval of target polarization characteristics in underwater environment."
Applied Optics
55
(3):
626--637
[10.1364/AO.55.000626]
Brady, P. C., A. A. Gilerson, G. W. Kattawar, et al. 2015. "Open-ocean fish reveal an omnidirectional solution to camouflage in polarized environments."
Science
350
(6263):
965-969
[10.1126/science.aad5284]
Ibrahim, A., A. Gilerson, T. Harmel, et al. 2012. "The relationship between upwelling underwater polarization and attenuation/absorption ratio."
Opt. Express
20
(23):
25,662-25,680
[10.1364/OE.20.025662]
Tonizzo, A., A. Gilerson, T. Harmel, et al. 2011. "Estimating particle composition and size distribution from polarized water-leaving radiance."
Applied Optics
50
(25):
5047-5058
[10.1364/AO.50.005047]
Non-Refereed
Foster, R., A. Ibrahim, A. Gilerson, et al. 2015. "Polarized above sea surface hyperspectral observations and their relationship with measured water properties."
Hyperspectral Imaging and Sounding of the Environment
HT3B--4
Gilerson, A., C. Carrizo, A. Tonizzo, et al. 2013. "Polarimetric imaging of underwater targets."
SPIE Defense, Security, and Sensing
872403--872403
Ahmed, S., A. Tonizzo, A. Ibrahim, et al. 2012. "Algal fluorescence: impact and potential for retrieval from measurements of the underwater degree of polarization."
SPIE Remote Sensing
85320I--85320I
Gilerson, A., A. Ibrahim, T. Harmel, A. Tonizzo, and S. Ahmed. 2012. "Polarization techniques for the retrieval of water parameters from above and below water polarimetric observations."
Proc. of SPIE Vol
8372
83720T--1
Harmel, T., A. Tonizzo, A. Ibrahim, et al. 2011. "Measuring underwater polarization field from above-water hyperspectral instrumentation for water composition retrieval."
SPIE Remote Sensing
817509--817509
Ibrahim, A., T. Harmel, A. Tonizzo, et al. 2011. "Exploring the relation between polarized light fields and physical-optical characteristics of the ocean for Remote Sensing applications."
SPIE Optical Engineering+ Applications
81600H--81600H
Hlaing, S., T. Harmel, A. Ibrahim, et al. 2010. "Validation of ocean color satellite sensors using coastal observational platform in Long Island Sound."
Remote Sensing
782504--782504
