Professor Emeritus


Research Interests

Radiative transfer; remote sensing of cloud and aerosol properties; earth’s energy budget; radiative forcing and climate change.

Current Research

Indirect radiative forcing of aerosols using CALIPSO LIDAR and A-train data.

Limits to indirect radiative forcing of aerosols as deduced from ship tracks.

Application of partly cloudy pixel retrievals to MODIS imagery data.

Surface radiation budget of the northeastern Pacific.


BS, University of California, Los Angeles (Physics), 1968
MA, University of California, Berkeley (Physics), 1970
PhD, University of California, Berkeley (Physics), 1972


Hayes, C.R., J.A. Coakley, Jr., and W.R. Tahnk, 2009: Relationships among properties of marine stratocumulus derived from collocated CALIPSO and MODIS observations. J. Geophys. Res. (in press).

Christensen, M.W., J.A. Coakley, Jr., and W.R. Tahnk, 2009: Morning to afternoon evolution of marine stratus polluted by underlying ships: Impications for the relative lifetimes of polluted and unpolluted clouds. J. Atmos. Sci., 66, 2097-2106.

Twohy, C.H., J.A. Coakley, Jr., and W.R. Tahnk, 2009: Effects of changes in relative humidity on aerosol scattering near clouds. J. Geophys. Res., 114, D05205, doi:10.1029/2008JD010991.

Marshak., A., G. Wen, J.A. Coakley, Jr., L.A. Remer, N.G. Loeb, and R.F. Cahalan, 2008: A simple model for the cloud adjacency effect and the apparent bluing of aerosols near clouds. J. Geophys., Res., 113, D14S17, doi:10.1029/2007JD009196.

Guo, G. and J.A. Coakley, Jr., 2008: Satellite estimates and shipboard observations of downward radiative fluxes at the ocean surface. J. Atmos. Ocean. Tech. 25, 429-441.

Chang, F.-L. and J.A. Coakley, Jr., 2007: Relationships between marine stratus cloud optical depth and temperature: Inferences from AVHRR observations. J. Climate, 20, 2022-2036.

Segrin, M.S., J.A. Coakley, Jr., and W.R. Tahnk, 2007: Summertime observations of ship tracks off the west coast of the U.S. in MODIS Terra and Aqua data. J. Atmos. Sci., 64, 4330-4345.

Matheson, M.A., J.A. Coakley, Jr., and W.R. Tahnk, 2006: Multiyear Advanced Very High Resolution Radiometer observations of summertime stratocumulus collocated with aerosols in the northeastern Atlantic. J. Geophys. Res., 111, D15206, doi:10.1029/2005JD006890.

Matheson, M. A., J. A. Coakley, Jr., and W. R. Tahnk, 2006: Effects of threshold retrievals on estimates of the aerosol indirect radiative forcing, Geophys. Res. Lett., 33, L07705, doi:10.1029/2005GL025614.

Matheson, M. A., J. A. Coakley, Jr., and W. R. Tahnk, 2005: Aerosol and cloud property relationships for summertime stratiform clouds in the northeastern Atlantic from Advanced Very High Resolution Radiometer observations, J. Geophys. Res. 110, D24204, doi:10.1029/2005JD006165.

Luderer, G., J.A. Coakley, Jr., and W.R. Tahnk, 2005: Using sun glint to check the relative calibration of reflected spectral radiances. J. Atmos. Ocean. Tech. 22, 1480-1493.

Coakley, J.A., Jr., M.A. Friedman, and W.R. Tahnk, 2005: Retrievals of cloud properties for partly cloudy imager pixels. J. Atmos. Ocean. Tech. 22, 3-17.

A.S. Ackerman, O.B. Toon, D.E. Stevens, and J.A. Coakley, Jr., 2003: Enhancement of cloud cover and suppression of nocturnal drizzle in stratocumulus polluted by haze. Geophys. Res. Lett., 30, 10.1029/2003GL017189.

Liu, G., H. Shao, J.A. Coakley, Jr., J.A. Curry, J.A. Haggerty, and M.A. Tschudi, 2003: Retrieval of cloud droplet size from visible and microwave radiometric measurements during INDOEX: Implication for aerosols’ indirect radiative effect. J. Geophys. Res. 108, 10.1029/2001JD001395.

Coakley, J.A., Jr., 2002: Reflectance and albedo, surface. Encyclopedia of the Atmosphere. J.R. Holton and J.A. Curry, Eds. Academic Press. 1914-1923.

Tahnk, W.R. and J.A. Coakley, Jr., 2002: Improved calibration coefficients for NOAA-12 and NOAA-15 AVHRR visible and near-IR channels. J. Atmos. Ocean. Tech. 19, 1826-1833.

Coakley, J.A., Jr., W.R. Tahnk, A. Jayaraman, P.K. Quinn, C. Devaux, and D. Tanré, 2002: Aerosol optical depths and direct radiative forcing for INDOEX derived from AVHRR: Theory. J. Geophys. Res. 107, 10.1029/2000JD000182.

Tahnk, W.R. and J.A. Coakley, Jr., 2002: Aerosol optical depths and direct radiative forcing for INDOEX Derived from AVHRR: Observations, January - March, 1996 – 2002. J. Geophys. Res. 107, 10.1029/2000JD000183.

Coakley, J.A., Jr. and C.D. Walsh, 2002: Limits to the aerosol indirect radiative effect derived from observations of ship tracks. J. Atmos. Sci., 59, 668-680.

Ramanathan, V., et al., 2001: Indian Ocean Experiment: An integrated analysis of the climate forcing and effects of the great Indo-Asian haze. J. Geophys. Res., 106, 28,371-28,398.

Tahnk, W.R. and J.A. Coakley, Jr., 2001: Improved calibration coefficients for NOAA-14 AVHRR visible and near-IR channels. Int. J. Remote Sens., 22, 1269-1283.

Taylor, J.P., M.D. Glew, J.A. Coakley, Jr., W.R. Tahnk, S. Platnick, P.V. Hobbs and R.J. Ferek, 2000: The effects of aerosols on the radiative properties of clouds. J. Atmos. Sci., 57, 2656-2670.

Coakley, J.A., Jr., P.A. Durkee, K. Nielsen, J.P. Taylor, S. Platnick, B.A. Albrecht, D. Babb, F-L. Chang, W.R. Tahnk, C.S. Bretherton, and P.V. Hobbs , 2000: The appearance and disappearance of ship tracks on large spatial scales. J. Atmos. Sci., 57, 2765-2778.