His primary research is the development and operation of the Second-generation Optimized Fabry-Perot Doppler Imager (SOFDI), which is a novel, one-of-a-kind, triple-etalon Fabry-Perot designed for 24-hour observations of thermospheric and mesospheric winds and temperatures. Concurrently, Andrew is working with an all-sky imager from Cornell University that will be used in conjunction with SOFDI to observe mesospheric gravity waves and thermospheric plasma irregularities. Andrew is also working on a number of related numerical modeling projects; notably the development of the community-accessible FOREGRATS model which tracks the generation and propagation of tropospherically-generated and secondary in-situ generated gravity waves. The SOFDI measurements, the all-sky imager data, and the FOREGRATS modeling efforts will be brought together to synergistically support the Air Force C/NOFS program that will study and forecast the occurrence of equatorial spread-F; a high priority “hot topic” research issue in the fields of space weather and plasma physics. This line of research is Andrew’s short-term research emphasis, though he has a number of spin-off projects.
Professional Review Papers
Meriwether, J. W., and A. J. Gerrard, Mesosphere inversion layers and stratosphere temperature enhancements, Rev. Geophys., 42, RG3003, doi:10.1029/2003RG000133, 2004.Peer-Reviewed Papers Appearing in Books
Gerrard, A. J., T. J. Kane, and J. P. Thayer, Year-round temperature and wave measurements of the Arctic middle atmosphere for 1995-1998, Atmospheric Science Across the Stratopause, D. E. Siskind, S. D. Eckermann, and M. E. Summers, Eds., Geophysical Monograph Series 123, American Geophysical Union, Washington, D.C., 2000.Professional (Peer-Reviewed) Journal Publications
Brown, L. B., A. J. Gerrard, J. W. Meriwether, and J. J. Makela, All-sky imaging observations of mesospheric fronts in OI 557.7 nm and broadband OH airglow emissions: Analysis of frontal structure, atmospheric background conditions, and potential sourcing mechanisms, J. Geophys. Res., 109, D19104, doi:10.1029/2003JD004223, 2004.Gerrard, A. J., T. J. Kane, S. D. Eckermann, and J. P. Thayer, Gravity waves and mesospheric clouds in the summer middle atmosphere: A comparison of lidar measurements and ray modeling of gravity waves over Sondrestrom, Greenland, J. Geophys. Res., 109(D10), D1010310.1029/2002JD002783, 2004.Gerrard, A. J., T. J. Kane, J. P. Thayer, and S. D. Eckermann, Concerning the upper stratospheric gravity wave and mesospheric cloud relationship over Sondrestrom, Greenland, J. Atmos. Solar-Terr.Phys., 66, 229-240, 2004.Thayer, J. P., M. Rapp, A. J. Gerrard, E. Gudmundsson, T. J. Kane, Gravity-wave influences on Arctic mesospheric clouds as determined by a Rayleigh lidar at Sondrestrom, Greenland, J. Geophys. Res., 108(D8), 8449, doi:10.1029/2002JD002363, 2003.Collins, S. C., J. M. C. Plane, M. C. Kelley, T. G. Wright, P. Soldán, R. J. Rollason, T. J. Kane, A. J. Gerrard, B. W. Grime, J. S. Friedman, S. A. González, Q. Zhou, and M. P. Sulzer, A study of the role of ion-molecule chemistry in the formation of sporadic sodium layers, J. Atmos. Solar-Terr. Physics, 64, 7, 845-860, 2002.Gerrard, A. J., T. J. Kane, J. P. Thayer, T. J. Duck, J. A. Whiteway, and J. Fiedler, Synoptic-scale study of the Arctic polar vortex’s influence on the middle atmosphere: I. Observations, J. Geophys. Res., 107(D16), 4276, doi: 10.1029/2001JD000681, 2002.Gerrard, A. J., T. J. Kane, J. P. Thayer, C. S. Ruf, and R. L. Collins, Consideration of non-Poisson distributions for Lidar applications, App. Optics, 40, 1488-1492, 2001.Gerrard, A. J., T. J. Kane, and J. P. Thayer, Noctilucent clouds and wave dynamics: Observations at Sondrestrom, Greenland, Geophys. Res. Lett., 25, 2817-2820, 1998.Gerrard, A. J., T. J. Kane, D. D. Meisel, J. P. Thayer, and R. B. Kerr, Investigation of a resonance lidar for measurement of thermospheric metastable helium, J. Atmos. Solar-Terr. Phys., 59, 2023-2035, 1997.Other (Peer-Reviewed) Publications
Kane, T. J., A. J. Gerrard, A. Hassiotis, Global forecasts of thermospheric gravity wave activity as generated from tropospheric sources: An overview of the FOREGRATS model with application to the prediction of equatorial spread-F, 85th AMS Annual Meeting, 9–13 January 2005, San Diego, California.Gerrard, A. J., Future CEDAR Lidar-Science Challenges, contribution to: CEDAR LIDAR BEYOND PHASE III; ACCOMPLISHMENTS, REQUIREMENTS AND GOALS, A self-assessment by the CEDAR lidar community for the National Science Foundation, R. L. Collins, ed., November 2003.Gerrard, A. J., J. P. Thayer, and T. J. Kane, Mesospheric clouds and the duality of gravity waves, Eos Transactions of the American Geophysical Union, 83(43), 488, 2002.Gerrard, A. J., Synoptic-scale Variability of Arctic Gravity Wave Activity During Summer and the Potential Impacts on the High Latitude Middle Atmosphere, Ph.D. Thesis, The Pennsylvania State University, 183 pp, 2002.Gerrard, A. J., C. M. Gerrard, M. A. London, K. A. Soldavin, T. J. Kane, and A. Freed, The Groundhog Oscillation (GO): Further Evidence For Global Change, Annals of Improbable Research, 7, Jan-Feb, 2001.