Sharon Vadas

Sharon and Berlin

NorthWest Research Associates, Inc.; CoRA office; 3380 Mitchell Lane; Boulder, CO 80301, USA;

Phone: (303) 415-9701 (x 202); Fax: (303) 415-9702;

vasha at nwra.com


Senior Research Scientist, NorthWest Research Associates, Inc., CoRA, Boulder, CO

Specialized professional competence:

* Theoretical and numerical work with atmospheric gravity waves (GWs)

* Modeling of the gravity waves excited by deep convection, body forces/heat/coolings, tsunamis and ocean wave packets

* Propagation and dissipation of GWs in the thermosphere via ray tracing

* Reconstruction of the GW field in the thermosphere via ray tracing with GW phases

Representative recent research:

* Developed a new compressible model for the excitation of GWs from tsunamis and oceans wave packets. Developed a new model for sprinkling GW spectra (with unique phases) into the ocean wave packet region, ray tracing the GWs into the thermosphere (with thermospheric dissipation), and reconstructing the GW field there.

* Calculated the response of the thermosphere and ionosphere to gravity wave (GW) dissipation in the thermosphere from force/heat/cooling. Found that this dissipation process creates localized thermospheric body forces. Determined that these body forces excite medium and large-scale secondary GWs and horizontal neutral winds that are variable in space and time

* Extracted the neutral, background winds at z=180-250 km using PFISR data of a propagating GWs. Also estimated the source of this wave to be secondary GWs excited from mountain wave breaking NW of Poker Flat, Alaska

* Estimated the thermospheric spectra from a deep convective plume and white noise, and found that the GW horizontal and vertical wavelengths increase significantly with altitude.

* Calculated the dissipation altitudes, maximum vertical wavelengths, horizontal distances traveled, and time take to travel these distances for a wide range of GWs in a variety of thermospheric temperatures and from launch altitudes in the lower atmosphere and thermosphere

* Developed a 3D ray-trace code which includes the most important forms of thermospheric dissipation for high-frequency GWs from the lower atmopshere

* Derived an anelastic GW dispersion relation which includes the most important forms of dissipation for high-frequency GWs from the lower atmopshere

* Derived the Boussinesq and compressible GW and mean responses to intermittent body forces and heatings

* Studied the excitation of GWs from deep convective plumes, clusters and mesoscale convective complexes, ray traced the GWs into the mesosphere, and compared with OH data of concentric rings from deep convection

* Studied the excitation of waves from multiple and intermittent horizontal and vertical body forcings

Other professional experience:

* Postdoc at LASP with Dr. D. Fritts at the University of Colorado, Boulder, Oct. 1995 - Jan. 1997;

* President's Postdoctoral Fellow, Center for Particle Astrophysics, University of California, Berkeley, Sept. 1993 - Sept. 1995;

* Guest Scientist in Numerical Cosmology, Theoretical Astrophysics, Fermi National Accelerator Lab, Jan. - Aug. 1993.

Academic Background:

* B.A. in physics and chemistry (1987), University of Rochester, USA;

* M.A. in physics (1990), University of Chicago, USA;

* Ph.D. in physics (1993), University of Chicago, USA.

Awards and Honors:

* CEDAR Prize Lecturer (2008): "The coupling of the lower atmosphere to the thermosphere via gravity wave excitation, propagation and dissipation"

* Associate Editor, Journal of Geophysical Research, Space Physics, Jan 1, 2010-2015.

SUBMITTED: None at this time.

IN PRESS: None at this time.

PEER-REVIEWED PUBLICATIONS:

* Vadas, S.L., J. Zhao, X. Chu and E. Becker, 2018, "The Excitation of secondary gravity waves from local body forces: Theory and observation", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1029/2017JD027970. Pdf version of this paper

* Vadas, S.L. and E. Becker, 2018, "Numerical modeling of the Excitation, propagation, and dissipation of primary and secondary gravity waves during wintertime at McMurdo Station in the Antarctic", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1029/2017JD027974. Pdf version of this paper

* Negale, M.R., M.J. Taylor , M.J. Nicolls, S.L. Vadas, K. Nielsen and Craig Heinselman, 2018, "Seasonal propagation characteristics of MSTIDs observed at high latitudes over central Alaska using the Poker Flat Incoherent Scatter Radar", J. Geophys. Res. Space Physics, https://doi.org/10.1029/2017JA024876. Pdf version of this paper

* Becker, E. and S.L. Vadas, 2018, "Secondary gravity waves in the winter mesosphere: Results from a high-resolution, gravity-wave resolving global circulation model", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1002/2017JD027460. Pdf version of this paper

* Lu, X., X. Chu, H. Li, C. Chen,, J. A. Smith, and S. L. Vadas, 2017 , "Statistical characterization of high-to-medium frequency mesoscale gravity waves by lidar-measured vertical winds and temperatures in the MLT", J. Atmos. Solar Terres. Phys., 162 , 3–15, https://doi.org/10.1016/j.jastp.2016.10.009. Pdf version of this paper

* Vadas, S. L. and G. Crowley, 2017, "Neutral wind and density perturbations in the thermosphere created by gravity waves observed by the TIDDBIT sounder", J. Geophys. Res. Space Physics, 122, doi:10.1002/2016JA023828. Pdf version of this paper

* Azeem, I., S. L. Vadas, G. Crowley, and J. J. Makela, 2017, Traveling ionospheric disturbances over the United States induced by gravity waves from the 2011 Tohoku tsunami and comparison with gravity wave dissipative theory, J. Geophys. Res. Space Physics, 122, 3430–3447, doi:10.1002/2016JA023659. Pdf version of this paper

* Paulino, I., A. F. Medeiros, S. L. Vadas, C. M. Wrasse, H. Takahashi, R. A. Buriti, D. Leite, S. Filgueira, J. V. Bageston, J. H. A. Sobral, and D. Gobbi, 2016, Periodic waves in the lower thermosphere observed by OI630 nm airglow images, Ann. Geophys., 34, 293-301, doi:10.5194/angeo-34-293-2016. Pdf version of this paper

* Vadas, S. L., J. J. Makela, M. J. Nicolls, and R. F. Milliff, 2015, Excitation of gravity waves by ocean surface wave packets: Upward propagation and reconstruction of the thermospheric gravity wave field, JGR Space Physics, 120, doi:10.1002/2015JA021430. Pdf version of this paper

* J. Westerhoff, G. Earle, R. Bishop, G. R. Swenson, S. Vadas, J. Clemmons, R. Davidson, L. Fanelli, C. Fish, V. Garg, A. Ghosh, B. B. Jagannatha, E. Kroeker, P. Marquis, D. Martin, S. Noel, C. Orr, R. Robertson, 2015, “LAICE CubeSat mission for gravity wave studies”, Advances in Space Research, 56 (7), 1413—1427.

* Vadas, S.L., H.-L. Liu, and R.S. Lieberman, 2014, "Numerical modeling of the global changes to the thermosphere and ionosphere from the dissipation of gravity waves from deep convection", JGR Space Physics, 119, doi:10.1002/2014JA020280. Pdf version of this paper

* Vadas, S.L., H. Suzuki, M.J. Nicolls, T. Nakamura, Robert O. Harmon, 2014, "Acoustic and atmospheric gravity waves excited by a fireball meteor: observations and modeling" J. Geophys. Res. Atmospheres, 119, doi:10.1002/2014JD021664. Pdf version of this paper and Na airglow movie (supplemental movie)

* Nicolls, M.J., S.L. Vadas, N. Aponte, and M.P. Sulzer, 2014, "Horizontal parameters of daytime thermospheric gravity waves and E region neutral winds over Puerto Rico", J. Geophys. Res. Space Physics, 119, doi:10.1002/2013JA018988. Pdf version of this paper

* Suzuki, S., S.L. Vadas, K. Shiokawa, and Y. Otsuka, S. Kawamura, and Y. Murayama, 2013, “Typhoon-induced concentric airglow structures in the mesopause region", GRL, 40, 1–5, doi:10.1002/2013GL058087. Pdf version of this paper

* Vadas, S.L. and D.C, Fritts, 2013, "Corrigendum" to "Gravity wave radiation and mean responses to local body forces in the atmosphere", Jour. Atmos. Sci., 70, 2680. Pdf version of this paper

* Smith, S.M., S.L. Vadas, W.J. Baggaley, G. Hernandez, and J. Baumgardner, 2013, "Gravity Wave Coupling Between the Mesosphere and Thermosphere Over New Zealand", J. Geophys. Res, 118, doi:10.1002/jgra.50263. Pdf version of this paper

* Vadas, S.L. and H.-L. Liu, 2013: "The large-scale neutral and plasma responses to the body forces created by the dissipation of gravity waves from 6 hours of deep convection in Brazil", J. Geophys. Res, 118, 1–25, doi:10.1002/jgra.50249. Pdf version of this paper

* Suzuki, H., T. Nakamura, S.L. Vadas, M. Tsutsumi, M. Taguchi, and Y. Fujiwara, 2013, “Inertial gravity wave in the polar mesopause region infered from successive images of a meteor train”, J. Geophys. Res, 118, 3047–3052, doi:10.1002/jgrd.50228. Pdf version of this paper

* Liu, H.-L. and S. L. Vadas, 2013: "Large-scale ionospheric disturbances due to the dissipation of convectively-generated gravity waves over Brazil", J. Geophys. Res, 118, 2419–2427, doi:10.1002/jgra.50244. Pdf version of this paper

* Vadas, S. L., 2013: "Compressible f-plane solutions to body forces, heatings, and coolings, and application to the primary and secondary gravity waves generated by a deep convective plume", J. Geophys. Res., 118, doi:10.1002/jgra.50163. Pdf version of this paper

* Chen, C., X. Chu, A. J. McDonald, S.L. Vadas, Z. Yu, W. Fong and X. Lu, 2013, “Inertia-gravity waves in Antarctica: A case study using simultaneous lidar and radar measurements at McMurdo/Scott Base (77.8° S, 166.7° E)”, JGR, 118, 1–15, doi:10.1002/jgrd.50318. Pdf version of this paper

* Liu, X. Xu, J., Yue, J. and S. L. Vadas, 2013, "Numerical modeling study of the momentum deposition of small amplitude gravity waves in the thermosphere", Ann. Geophy., 31, 1–14. Pdf version of this paper

* Paulino, I., H. Takahashi, S.L. Vadas, C.M. Wrasse, J.H.A. Sobral, A.F. Medeiros, R.A. Buriti, D. Gobbi, 2012, "Forward ray tracing for medium-scale gravity waves observed during the COPEX campaign", J. Atmos. Solar Terres. Phys., 90-91, 117-123. Pdf version of this paper

* Vadas, S. L. and M. J. Nicolls, 2012, "The Phases and Amplitudes of Gravity Waves Propagating and Dissipating in the Thermosphere: Theory", J. Geophys. Res, 117, A05322, doi:10.1029/2011JA017426. Pdf version of this paper

* Nicolls, M. J., S. L. Vadas, J. W. Meriwether, M. G. Conde, and D. Hampton, 2012, “The Phases and Amplitudes of Gravity Waves Propagating and Dissipating in the Thermosphere: Application to Measurements over Alaska”, J. Geophys. Res, 117, A05323, doi:10.1029/2012JA017542. Pdf version of this paper

* Vadas, S.L., J. Yue, and T. Nakamura, 2012, ``Mesospheric concentric gravity waves generated by multiple convection storms over the North America Great Plain'', JGR, 117, D7, doi:10.1029/2011JD017025. Pdf version of this paper

* Nicolls, M. J., R. H. Varney, S. L. Vadas, P.A. Stamus, C. J. Heinselman, R. B. Cosgrove, and M. C. Kelley, 2010, "Case Study of an Inertia-Gravity Wave in the Mesosphere over Alaska with the Poker Flat Incoherent Scatter Radar", JGR, 115, D00N02, doi:10.1029/2010JD014042. Pdf version of this paper

* Makela, J.J., S.L. Vadas, R. Muryanto, T. Duly, and G. Crowley, 2010: "Periodic spacing between consecutive equatorial plasma bubbles", GRL, 37, L14103, doi:10.1029/2010GL043968. Pdf version of this paper

* Vadas, S.L. and G. Crowley, 2010: "Sources of the traveling ionospheric disturbances observed by the ionospheric TIDDBIT sounder near Wallops Island on October 30, 2007", JGR, 115, A07324, doi:10.1029/2009JA015053. Pdf version of this paper

* Earle, G.D. P. Bhaneja, P.A. Roddy, C.M. Swenson, A. Barjatya, R.L. Bishop, T.W. Bullett, G. Crowley, R. Redmon, K. Groves, R. Cosgrove, and S.L. Vadas, 2010. “A comprehensive rocket and radar study of midlatitude spread F'”, J. Geophys. Res., 115, A12339, doi:10.1029/2010JA015503. Pdf version of this paper

* Takahashi, H., M. A. Abdu, M. J. Taylor, P.‐D. Pautet, E. de Paula, E. A. Kherani, A. F. Medeiros, C. M. Wrasse, I. S. Batista, J. H. A. Sobral, D. Gobbi, D. Arruda, I. Paulino, S. Vadas, D. Fritts, 2010, "Equatorial ionosphere bottom-type spread F observed by OI 630.0 nm airglow imaging", GRL, 37, L03102, doi:10.1029/2009GL041802.

* Sharon L. Vadas and M.J. Keskinen, 2010: Correction to “Three-dimensional nonlinear evolution of equatorial ionospheric bubbles with gravity wave seeding and tidal wind effects'', GRL, 37, L03101, doi:10.1029/2009GL041216. Pdf version of this paper

* Sharon L. Vadas and Han-Li Liu, 2009: ``The Generation of Large-Scale Gravity Waves and Neutral Winds in the Thermosphere From the Dissipation of Convectively-Generated Gravity Waves'', JGR, 114, A10310, doi:10.1029/2009JA014108. pdf version of this paper

* Sharon L. Vadas and Mike Nicolls, 2009: "Temporal Evolution of Neutral, Thermospheric Winds and Plasma Response using PFISR Measurements of Gravity Waves" JASTP, 71, 740-770. Pdf version of this paper

* Taylor, M.J., P.-D. Pautet, A.F. Medeiros, R.A. Buriti, J. Fechine, D.C. Fritts, S.L. Vadas, H. Takahashi, and F.T. Sao Sabbas, 2009: "Characteristics of mesospheric gravity waves near the magnetic equator, Brazil during the SpreadFEx campaign", Ann. Geophys., 27, 461-472. Pdf version of this paper

* Fritts, D. C., Abdu, M. A., Batista, B. R., Batista, I. S., Batista, P. P., Buriti, R., Clemesha, B. R., Comberiate, J., Dautermann, T., de Paula, E., Fechine, B. J., Fejer, B., D.Gobbi, Haase, J., Kamalabadi, F., Laughman, B., Lima, P. P., Liu, H., Medeiros, A., Pautet, D., ao Sabbas, F. S., Sobral, J. H. A., Stamus, P., Takahashi, H., Taylor, M. J., Vadas, S. L., and Wrasse, C., 2007: "The Spread F Experiment (SpreadFEx): Program overview and first results", Earth, Planets and Space, 61, 411-430, 2009. Pdf version of this paper

* Fritts, D.C., M. A. Abdu, B. R. Batista, I. S. Batista, P. P. Batista, R. Buriti, B. R. Clemesha, T. Dautermann, E. de Paula, B. J. Fechine, B. Fejer, D. Gobbi, J. Haase, F. Kamalabadi, E. R. Kherani, B. Laughman, P. P. Lima, H.-L. Liu, A. Medeiros, D. Pautet, D. M. Riggin, F. S. Rodrigues, F.T. Sao Sabbas, J. H. A. Sobral, P. Stamus, H. Takahashi, M. J. Taylor, S. L. Vadas, F. Vargas, C. Wrasse, 2009: "Overview and Summary of the Spread F Experiment (SpreadFEx)", Annals Geoph., 27, 1-15. Pdf version of this paper

* Sharon L. Vadas, Jia Yue, Joe She, Pete Stamus, and Alan Liu, 2009: "A model study of the effects of winds on concentric rings of gravity waves from a convective plume near Fort Collins on 11 May 2004", Jour. Geoph. Res, 114, D06103, doi:10.1029/2008JD010753. Pdf version of this paper

* Yue, J., S.L. Vadas, C.-Y. She, T. Nakamura, S. Reising, D. Krueger, H.-Li Liu, P. Stamus, D. Thorsen, W. Lyons, T. Li, 2009: "A study of OH imager observed concentric gravity waves near Fort Collins on 11 May 2004", Jour. Geoph. Res, 114, D06104, doi:10.1029/2008JD011244. Pdf version of this paper

* Takahashi, H., M. J. Taylor, P.-D. Pautet, A. F. Medeiros, D. Gobbi, C. M. Wrasse, J. Fechine, M. A. Abdu, I. S. Batista, E. Paula, J.H.A. Sobral, D. Arruda, S. L. Vadas, F. S. Sabbas and D. C. Fritts, 2008: "Simultaneous observation of ionospheric plasma bubbles and mesospheric gravity waves during the SpreadFEx Campaign", Annals Geoph., 27, 1477-1487

* Sao Sabbas, F.T., V. T. Rampinelli, J. Santiago, P. Stamus, S.L. Vadas, G. Dolif Neto, 2008: "Characterization of convective gravity wave sources in satellite IR imagery", Annals Geoph., 27, 1279-1293.

* Fritts, D.C., S.L. Vadas, D.M. Riggin, M.A. Abdu, I.S. Batista, H. Takahashi, A. Medeiros, F. Kamalabadi, H.-L. Liu, B. J. Fejer,and M.J. Taylor, 2008: "Gravity wave and tidal influences on equatorial spread F based on observations during the spread F experiment (SpreadFEx)", Annals Geoph., 26, 3235-3252.

* Sharon L. Vadas and Dave C. Fritts, 2009: "Reconstruction of the gravity wave field excited by convective plumes via ray tracing in real space", Annals. Geophys., 27, 147-177. Pdf version of this paper

* Sharon L. Vadas, M.J. Taylor, P.-D. Pautet, P.A. Stamus, D.C. Fritts, H.-L. Liu, F.T. Sao Sabbas, V.T.Rampinelli, P. Batista, and H. Takahashi, 2009: "Convection: the likely source of the medium-scale gravity waves observed in the OH airglow layer near Brasilia, Brazil, during the SpreadFEx campaign", Ann. Geophys, 27, 231-259. Pdf version of this paper

* Dave C. Fritts and Sharon L. Vadas, 2008: "Gravity wave penetration into the thermosphere: Sensitivity to solar cycle variations and mean winds", Annals. Geophys, 26, 3841-3861. pdf version of this paper

* Sharon L. Vadas and Mike Nicolls, 2008: "Using PFISR Measurements and Gravity Wave Dissipative Theory to Determine the Neutral, Background Thermospheric Winds" Geoph. Res. Letters, 35, {L02105, doi:10.1029/2007GL031522} Pdf version of this paper

* Earle, G.D., A. Mwene-Musumba, and S.L. Vadas, 2008: "Satellite-Based measurements of gravity wave-induced Mid-latitude plasma density perturbations" J. Geoph. Res, 113, A03303, doi:10.1029/2007JA012766. Pdf version of this paper

* Sharon L. Vadas, 2007: "Horizontal and vertical propagation, and dissipation of gravity waves in the thermosphere from lower atmospheric and thermospheric sources", J. Geoph. Res., {112}'{A06305, doi:10.1029/2006JA011845}. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2006: "The influence of solar variability on gravity wave structure and dissipation in the thermosphere from tropospheric convection", J. Geoph. Res., {111, A10S12}'{doi:10.1029/2005JA011510}. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2005: "Thermospheric responses to gravity waves: Influences of increasing viscosity and thermal diffusivity", J. Geoph. Res.,{110, D15103}'{doi:10.1029/2004JD005574}. Pdf version of this paper

* Fritts, D. C., S. L. Vadas, K. Wan, and J. A. Werne, 2006: Mean and variable forcing of the middle atmosphere by gravity waves", J. Atmos. Solar-Terres. Phys., 68, 247-265.

* Sharon L. Vadas and David C. Fritts, 2004: "Thermospheric responses to gravity waves arising from mesoscale convective complexes", J. Atmos. Terr. Sci., 66, 781-804. Pdf version of this paper

* Sharon L. Vadas, David C. Fritts, and M. Joan Alexander, 2003: "Mechanism for the generation of secondary waves in wave breaking regions", Jour. Atmos. Sci., 60, 194--214. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2002: "The Importance of spatial variability in the generation of secondary gravity waves from local body forces," Geophys. Res. Lett., 29(20) 10.1029/2002GL015574 Pdf version of this paper

* David C. Fritts, Sharon L. Vadas, and Y. Yamada, 2002: "An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations", Geophy. Res. Lett, 29(10) 10.1029/2001GL013753 Pdf version of this paper

* Ben Balsley, David C. Fritts, R. Frehlich, M. Jones, S.L. Vadas, R. Coulter, 2002: "Up-gully flow in the great plains region: a mechanism for perturbing the nightime lower atmosphere", Geophys. Res. Lett., 29(19) 10.1029/2002GL015435 Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2001: "Gravity wave radiation and mean responses to local body forces in the atmosphere,"Jour. Atmos. Sci., 58, 2249--2279. Pdf version of this paper

* David C. Fritts, Sharon L. Vadas and Oyvind Andreassen, 1998: "Gravity wave excitation and momentum transport in the solar interior: Implications for a residual circulation and lithium depletion," Astronomy & Astrophysics, 333, 343-361

click here for 2006-2009 Aeronomy NSF studies .

Sharon and Berlin in High Plains show, spring 2015