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Browsing College of Earth, Ocean, and Atmospheric Sciences by Author

Browsing College of Earth, Ocean, and Atmospheric Sciences by Author "Tahnk, William R."

Now showing items 1-10 of 10

Aerosol and cloud property relationships for summertime stratiform clouds in the northeastern Atlantic from Advanced Very High Resolution Radiometer observations

Matheson, Mark A.; Coakley, James A.; Tahnk, William R. (American Geophysical Union, 2005)

Advanced Very High Resolution Radiometer (AVHRR) 4-km data collected over the northeastern Atlantic off the coast of the Iberian Peninsula for May to August 1995 were used to investigate the feasibility of empirically de ...
Aerosol optical depth and direct radiative forcing for INDOEX derived from AVHRR: Observations, January–March 1996–2000

Tahnk, William R.; Coakley, James A. (American Geophysical Union, 2002)

Visible and near infrared reflectances from NOAA-14 Advanced Very High Resolution Radiometer (AVHRR) daytime passes are used to derive optical depths at 0.55 μm, an index of aerosol type, continental or marine, and the d ...
Aerosol optical depths and direct radiative forcing for INDOEX derived from AVHRR: Theory

Coakley, James A.; Tahnk, William R.; Jayaraman, A.; Quinn, Patricia K.; Devaux, Claude; Tanré, Didier (American Geophysical Union, 2002)

A scheme is presented for retrieving aerosol properties for ocean regions from reflected sunlight at both the visible and near infrared wavelengths measured by the NOAA advanced very high resolution radiometer (AVHRR). F ...
Effect of changes in relative humidity on aerosol scattering near clouds

Twohy, Cynthia; Coakley, James A. Jr.; Tahnk, William R. (American Geophysical Union, 2009)

Many investigations using satellite data have determined that aerosol optical depth and cloud cover are correlated and some have interpreted the correlation as evidence of an aerosol indirect effect on clouds. This study ...
Effects of Aerosols on the Radiative Properties of Clouds

Taylor, Jonathan P.; Glew, Martin D.; Coakley, James A., Jr.; Tahnk, William R.; Platnick, Steven; Hobbs, Peter V.; Ferek, Ronald J. (American Meteorological Society, 2000-08)

The influence of anthropogenic aerosols, in the form of ship exhaust effluent, on the microphysics and radiative properties of marine stratocumulus is studied using data gathered from the U.K. Met. Office C-130 and the U ...
Effects of threshold retrievals on estimates of the aerosol indirect radiative forcing

Matheson, Mark A.; Coakley, James A.; Tahnk, William R. (American Geophysical Union, 2006)

Empirical estimates of the aerosol indirect radiative forcing often rely on threshold cloud retrievals applied to multispectral satellite imagery data. In such retrievals, pixels having radiances that surpass prescribed ...
Improved Calibration Coefficients for NOAA-12 and NOAA-15 AVHRR Visible and Near-IR Channels

Tahnk, William R.; Coakley, James A. Jr. (American Meteorological Society, 2002-11)

A time history of the calibration coefficients for channels 1 and 2 of the Advanced Very High Resolution Radiometer (AVHRR) on the NOAA-12 and NOAA-15 spacecraft is presented. The history is based on reflectances observe ...
Morning-to-Afternoon Evolution of Marine Stratus Polluted by Underlying Ships: Implications for the Relative Lifetimes of Polluted and Unpolluted Clouds

Christensen, Matthew W.; Coakley, James A., Jr.; Tahnk, William R. (American Meteorological Society, 2009-07)

Ship tracks appearing in both the morning and afternoon Moderate Resolution Imaging Spectroradiometer (MODIS) imagery for the Pacific Ocean off the west coast of the United States were used to study the morning-to-afte ...
Retrieval of Cloud Properties for Partly Cloudy Imager Pixels

Coakley, James A. Jr.; Friedman, Michael A.; Tahnk, William R. (American Meteorological Society, 2005-01)

Retrievals of cloud properties from satellite imagery often invoke the assumption that the fields of view are overcast when cloud-contaminated, even though a significant fraction are only partially cloud-covered. The ove ...
Using Sun Glint to Check the Relative Calibration of Reflected Spectral Radiances

Luderer, Gunnar; Coakley, James A. Jr.; Tahnk, William R. (American Meteorological Society, 2005-10)

Observations of sunlight reflected from regions of sun glint are used to check the relative calibration of spectral radiances obtained with imaging radiometers. Reflectances at different wavelengths for sun-glint regions ...