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Tamas Varnai

Research Associate Professor

Joint Center for Earth Systems Technology
Nasa/Gsfc Location--Off Campus
Ph D, McGill University (1996)
Other, Eotvos Lorand University (1989)

Prior to joining UMBC in 1999, Dr. Varnai worked as researcher at the Hungarian Meteorological Service, and as postdoctoral fellow at McGill University and at the University of Arizona.

Research Interests

Dr. Varnai’s research aims at improving our ability to measure the properties of clouds and atmospheric aerosols from space, and to use satellite data for better understanding the impact of clouds and aerosols on the solar heating of our planet. He is particularly interested in the way the three-dimensional nature of atmospheric radiative processes affects satellite observations, and in understanding the way atmospheric particle populations change in the vicinity of clouds. His work involves analyzing data from satellite instruments such as MODIS or CALIOP and airborne instruments such as THOR or CAR, and combining the data with theoretical simulations of radiative processes.

Selected Classes
Spring 2020 PHYS 640/440 – Computational Physics
Contracts, Fellowships, Grants, and Sponsored Research

Varnai, Tamas (Principal) Marshak, Alexander (Co-Principal) Levy, Robert (Co-Principal) Wen, Guoyong (Co-Principal) MODIS and VIIRS aerosol properties in partly cloudy regions Grant (Funded) Sponsored by NASA

Varnai, Tamas (Co-Principal) Marshak, Alexander (Principal) Yang, Weidong (Co-Principal) Use of CALIOP data for understanding cloud-related variations in aerosol properties and aerosol radiative effects Grant (Funded) Sponsored by NASA

Intellectual Contributions

Deep space observations of sun glints from marine ice clouds vol. 17 IEEE Geosci. Rem. Sens. Lett.

Developing an aircraft-based angular distribution model of solar reflection from wildfire smoke to aid satellite-based radiative flux estimation 1509 vol. 11 doi:10.3390/rs11131509 Remote Sensing

MISR radiance anomalies induced by stratospheric volcanic aerosols vol. 10 1875, doi:10.3390/rs10121875 Remote Sensing

Satellite observations of cloud-related variations in aerosol properties vol. 9 doi: 10.3390/atmos9110430 Atmosphere

Scale dependence of cirrus heterogeneity effects. Part II: MODIS NIR and SWIR channels vol. 18 12105–12121, doi: 10.5194/acp-18-12105-2018 Atmos. Chem. Phys.

EPIC spectral observations of variability in Earth's global reflectance vol. 10 doi:10.3390/rs10020254 Remote Sensing

Observation-based study on aerosol optical depth and particle size in partly cloudy regions vol. 122 doi: 10.1002/2017JD027028 J. Geophys. Res.

Scale dependence of cirrus heterogeneity effects. Part I: MODIS thermal infrared channels vol. 17 8489-8508, doi: 10.5194/acp-17-8489-2017 Atmos. Chem. Phys.

Terrestrial glint seen from deep space: oriented ice crystals detected from the Lagrangian point vol. 44 doi:10.1002/2017GL073248 Geophys. Res. Lett.

Testing the two-layer model for correcting near cloud reflectance enhancement using LES/SHDOM simulated radiances vol. 121 9661–9674 Journal of Geophysical Research

Radiative characteristics of clouds embedded in smoke derived from airborne multiangular measurements vol. 121 doi:10.1002/2016JD025309 J. Geophys. Res.

Effect of cloud fraction on near-cloud aerosol behavior in the MODIS atmospheric correction ocean color product vol. 7 5283-5299 Remote Sensing

CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction vol. 41 9150-9157 Geophys. Res. Lett.

Extending 3D near-cloud corrections from shorter to longer wavelengths vol. 147 79-85 J. Quant. Spect. Radiative Transfer

Near-cloud aerosol properties from the 1-km resolution MODIS ocean product 3 vol. 119 1546–1554 Journal of Geophysical Research

Improvement of MODIS aerosol retrievals near clouds vol. 118 9168–9181 Journal of Geophysical Research

Shape-induced gravitational sorting of Saharan dust during transatlantic voyage: Evidence from CALIOP lidar depolarization measurements 12 vol. 40 3281-3286 Geophysical Research Letters

vol. 13 3899-3908 Atmospheric Chemistry and Physics

CALIPSO observations of transatlantic dust: vertical stratification and effect of clouds vol. 12 11339-11354 Atmospheric Chemistry and Physics

Cloud droplet size retrievals from zenith radiance measurements: examples from the Atmospheric Radiation Measurement Program and the Aerosol Robotic Network vol. 12 10313-10329 Atmospheric Chemistry and Physics

Effect of CALIPSO cloud aerosol discrimination (CAD) confidence levels on observations of aerosol properties near clouds vol. 116 131-141 Atmospheric Research

Taking the pulse of pyrocumulus clouds vol. 52 121-130 Atmospheric Environment

Analysis of co-located MODIS and CALIPSO observations near clouds vol. 5 389-396 Atmospheric Measurement Techniques

A variational method to retrieve the extinction profile in liquid clouds using multiple field-of-view lidar vol. 51 350-365 Journal of applied meteorology and climatology

Cloud Impact on Surface Altimetry From a Spaceborne 532-nm Micropulse Photon-Counting Lidar: System Modeling for Cloudy and Clear Atmospheres vol. 49 4910-4919 IEEE Trans. Geosci. Rem. Sens.

Implementation on Landsat data of a simple cloud mask algorithm developed for MODIS land bands vol. 99 597-601 IEEE Geosc. & Rem. Sens. Lett.

Global CALIPSO observations of aerosol changes near clouds vol. 8 19-23 IEEE Geosci. Remote Sens. Lett.