keywords Earth's middle atmosphere dynamics and chemistry, Lagrangian transport, vertical coupling, data analysis
selected publications chapter Sudden Stratospheric Warming Impacts on the Ionosphere-Thermosphere System: A Review of Recent Progress. Geophysical Monograph. 369-400. 2021 conference proceeding Estimations of forest fire smoke forcing from surface measurements, satellite data, and trajectory modeling. 47-50. 2002 journal article A Statistical Study of Polar Mesospheric Cloud Fronts in the Northern Hemisphere. Journal of Geophysical Research: Atmospheres. 2024 The Influence of Space Traffic on AIM/CIPS PMC Frequencies at 80°N. Earth and Space Science. 2024 Seasonal Distribution of Gravity Waves Near the Stratopause in 2019-2022. Earth and Space Science. 2024 Planetary Wave Modulation of Gravity Waves Over the Andes in 2016. Journal of Geophysical Research: Atmospheres. 2023 Mesospheric Temperature and Circulation Response to the Hunga Tonga-Hunga-Ha'apai Volcanic Eruption. Journal of Geophysical Research: Atmospheres. 2023 Polar Vortex Strength Impacts on the Longitudinal Structure of Thermospheric Composition and Ionospheric Electron Density. Journal of Geophysical Research: Space Physics. 2023 Importance of satellite constellations to measure global ionosphere- thermosphere-mesosphere composition, temperature and winds 2023 Improving ionospheric predictability requires accurate simulation of the mesospheric polar vortex 2023 Measurements of the mean structure, temperature, and circulation of the MLT 2023 Sun-Earth Coupling via Energetic Particle Precipitation 2023 CIPS Observations of Gravity Wave Activity at the Edge of the Polar Vortices and Coupling to the Ionosphere. Journal of Geophysical Research: Atmospheres. 2023 Modeling the Day-To-Day Variability of Midnight Equatorial Plasma Bubbles With SAMI3/SD-WACCM-X. Journal of Geophysical Research: Space Physics. 2023 Spatial analysis of the ancient proteome of archeological teeth using mass spectrometry imaging. Rapid Communications in Mass Spectrometry. 2023 Polar vortex strength impacts on the longitudinal structure of thermospheric composition and ionospheric electron density 2023 Algorithm Stability and the Long-Term Geospace Data Record From TIMED/SABER. Geophysical Research Letters. 2023 The Role of the Quasi 5-Day Wave on the Onset of Polar Mesospheric Cloud Seasons in the Northern Hemisphere. Journal of Geophysical Research: Atmospheres. 2023 Secondary Gravity Waves From the Stratospheric Polar Vortex Over ALOMAR Observatory on 12-14 January 2016: Observations and Modeling. Journal of Geophysical Research: Atmospheres. 2023 Algorithm Stability and the Long-Term Geospace Data Record from TIMED/SABER 2022 Multi-Step Vertical Coupling During the January 2017 Sudden Stratospheric Warming. Journal of Geophysical Research: Space Physics. 2022 Cooling and Contraction of the Mesosphere and Lower Thermosphere From 2002 to 2021. Journal of Geophysical Research: Atmospheres. 2022 Improving ionospheric predictability requires accurate simulation of the mesospheric polar vortex. Frontiers in Astronomy and Space Sciences. 2022 Perturbations in stratospheric aerosol evolution due to the water-rich plume of the 2022 Hunga-Tonga eruption. Communications Earth & Environment. 2022 Evaluation of Polar Winter Mesopause Wind in WACCMX plus DART. Journal of Geophysical Research: Atmospheres. 2022 Sounding Rocket Observation of Nitric Oxide in the Polar Night. Journal of Geophysical Research: Space Physics. 2022 Impact of Strong and Weak Stratospheric Polar Vortices on the Mesosphere and Lower Thermosphere. Geophysical Research Letters. 2022 Travelling Ionospheric Disturbances Detected by the Scintillation Observations and Response of The Ionosphere to Electrodynamics (SORTIE) CubeSat at 420 km Altitude 2022 Influence of stratospheric gravity waves on TID activity at middle latitudes 2022 Multi-step vertical coupling from the troposphere to the thermosphere due to gravity waves 2022 Planetary wave-driven enhanced NO descent into the top of the Arctic polar vortex during major and minor sudden stratospheric warmings 2022 Climatology of Traveling Ionospheric Disturbances Observed by HamSCI Amateur Radio with Connections to Geospace and Neutral Atmospheric Sources. 2022 A High-Resolution Whole-Atmosphere Model With Resolved Gravity Waves and Specified Large-Scale Dynamics in the Troposphere and Stratosphere. Journal of Geophysical Research: Atmospheres. 2022 Observations of Pole-to-Pole, Stratosphere-to-Ionosphere Connection. Frontiers in Astronomy and Space Sciences. 2022 Intercomparison of middle atmospheric meteorological analyses for the Northern Hemisphere winter 2009-2010. Atmospheric Chemistry and Physics. 17577-17605. 2021 A New MEPED-Based Precipitating Electron Data Set. Journal of Geophysical Research: Space Physics. 2021 Planetary wave-driven enhanced NO descent into the top of the Arctic polar vortex during major and minor SSWs 2021 Troposphere-Mesosphere Coupling by Convectively Forced Gravity Waves During Southern Hemisphere Monsoon Season as Viewed by AIM/CIPS. Journal of Geophysical Research: Space Physics. 2021 Two- and three-dimensional structures of the descent of mesospheric trace constituents after the 2013 sudden stratospheric warming elevated stratopause event. Atmospheric Chemistry and Physics. 14059-14077. 2021 Lower Thermospheric Material Transport via Lagrangian Coherent Structures. Journal of Geophysical Research: Space Physics. 2021 Impact of September 2019 Antarctic Sudden Stratospheric Warming on Mid-Latitude Ionosphere and Thermosphere Over North America and Europe. Geophysical Research Letters. 2021 Transport of Nitric Oxide Via Lagrangian Coherent Structures Into the Top of the Polar Vortex. Journal of Geophysical Research: Atmospheres. 2021 Intercomparison of Middle Atmospheric Meteorological Analyses for the Northern Hemisphere Winter 2009–2010 2021 Supplementary material to "Intercomparison of Middle Atmospheric Meteorological Analyses for the Northern Hemisphere Winter 2009–2010" 2021 Residual temperature bias effects in stratospheric species distributions from LIMS. Atmospheric Measurement Techniques. 2185-2199. 2021 Impact of Antarctic Sudden Stratospheric Warming on Mid-Latitude Thermosphere and Ionosphere over USA and Europe 2021 Tidal Variations in the Mesosphere and Lower Thermosphere Before, During, and After the 2009 Sudden Stratospheric Warming. Journal of Geophysical Research: Space Physics. 2021 2 and 3-dimensional structure of the descent of mesospheric trace; constituents after the 2013 SSW elevated stratopause event 2021 Observations of Stratospheric Gravity Waves Over Europe on 12 January 2016: The Role of the Polar Night Jet. Journal of Geophysical Research: Atmospheres. 2020 First Lidar Observations of Quasi-Biennial Oscillation-Induced Interannual Variations of Gravity Wave Potential Energy Density at McMurdo via a Modulation of the Antarctic Polar Vortex. Journal of Geophysical Research: Atmospheres. 2020 Longitudinally Dependent Low-Latitude Ionospheric Disturbances Linked to the Antarctic Sudden Stratospheric Warming of September 2019. Journal of Geophysical Research: Space Physics. 2020 Longitudinally-Dependent Low-Latitude Ionospheric Disturbances Linked to the Antarctic Sudden Stratospheric Warming of September 2019 2020 Technical note: LIMS observations of lower stratospheric ozone in the southern polar springtime of 1978. Atmospheric Chemistry and Physics. 3663-3668. 2020 Perturbations of Global Wave Dynamics During Stratospheric Warming Events of the Solar Cycle 24 2020 LIMS observations of lower stratospheric ozone in the southern polar springtime of 1978 2019 Evaluation of the Mesospheric Polar Vortices in WACCM. Journal of Geophysical Research: Atmospheres. 10626-10645. 2019 Atmospheric Effects of >30-keV Energetic Electron Precipitation in the Southern Hemisphere Winter during 2003. Journal of Geophysical Research: Space Physics. 8138-8153. 2019 Beware of Inertial Instability Masquerading as Gravity Waves in Stratospheric Temperature Perturbations. Geophysical Research Letters. 1740-1745. 2019 Observations of Reduced Turbulence and Wave Activity in the Arctic Middle Atmosphere Following the January 2015 Sudden Stratospheric Warming. Journal of Geophysical Research: Atmospheres. 13259-13276. 2018 Stratospheric Aerosols, Polar Stratospheric Clouds, and Polar Ozone Depletion After the Mount Calbuco Eruption in 2015. Journal of Geophysical Research: Atmospheres. 12308-12331. 2018 On the Upward Extension of the Polar Vortices Into the Mesosphere. Journal of Geophysical Research: Atmospheres. 9171-9191. 2018 Deep Ionospheric Hole Created by Sudden Stratospheric Warming in the Nighttime Ionosphere. Journal of Geophysical Research: Space Physics. 7621-7633. 2018 Lidar Observations of Stratospheric Gravity Waves From 2011 to 2015 at McMurdo (77.84°S, 166.69°E), Antarctica: 2. Potential Energy Densities, Lognormal Distributions, and Seasonal Variations. Journal of Geophysical Research: Atmospheres. 7910-7934. 2018 Effects of the september 2005 Solar Flares and Solar Proton Events on the Middle Atmosphere in WACCM. Journal of Geophysical Research: Space Physics. 5747-5763. 2018 On the consistency of HNO3 and NO2 in the Aleutian High region from the Nimbus 7 LIMS Version 6 data set. Atmospheric Measurement Techniques. 3611-3626. 2018 Local and Remote Planetary Wave Effects on Polar Mesospheric Clouds in the Northern Hemisphere in 2014. Journal of Geophysical Research: Atmospheres. 5149-5162. 2018 New AIM/CIPS global observations of gravity waves near 50-55 km. Geophysical Research Letters. 7044-7052. 2017 HEPPA-II model-measurement intercomparison project: EPP indirect effects during the dynamically perturbed NH winter 2008-2009. Atmospheric Chemistry and Physics. 3573-3604. 2017 Role of Wind Filtering and Unbalanced Flow Generation in Middle Atmosphere Gravity Wave Activity at Chatanika Alaska. Atmosphere. 2017 Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems. Atmospheric Chemistry and Physics. 1417-1452. 2017 Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems 2016 Effects of polar stratospheric clouds in the Nimbus-7 LIMS version 6 data set 2016 Effects of polar stratospheric clouds in the Nimbus 7 LIMS Version 6 data set. Atmospheric Measurement Techniques. 2927-2946. 2016 Chemical definition of the mesospheric polar vortex. Journal of Geophysical Research: Atmospheres. 2015 Chemical definition of the mesospheric polar vortex. Journal of Geophysical Research: Atmospheres. 10166-10179. 2015 Is a high-altitude meteorological analysis necessary to simulate thermosphere-stratosphere coupling?. Geophysical Research Letters. 8225-8230. 2015 Extreme stratospheric springs and their consequences for the onset of polar mesospheric clouds. Journal of Atmospheric and Solar: Terrestrial Physics. 74-81. 2015 Modeling and mechanisms of polar winter upper stratosphere/lower mesosphere disturbances in WACCM. Journal of Geophysical Research: Atmospheres. 7635-7647. 2015 Simulated solar cycle effects on the middle atmosphere: WACCM3 Versus WACCM4. Journal of Advances in Modeling Earth Systems. 806-822. 2015 Simulation of energetic particle precipitation effects during the 2003-2004 Arctic winter. Journal of Geophysical Research: Space Physics. 5035-5048. 2015 A climatology of planetary wave-driven mesospheric inversion layers in the extratropical winter. Journal of Geophysical Research: Atmospheres. 399-413. 2015 A multi tracer analysis of thermosphere to stratosphere descent triggered by the 2013 Stratospheric Sudden Warming. Geophysical Research Letters. 5216-5222. 2014 Stratosphere-mesosphere coupling during stratospheric sudden warming events. Advances in Space Research. 1265-1289. 2014 Middle atmospheric changes caused by the January and March 2012 solar proton events. Atmospheric Chemistry and Physics. 1025-1038. 2014 The influence of major sudden stratospheric warming and elevated stratopause events on the effects of energetic particle precipitation in WACCM. Journal of Geophysical Research: Atmospheres. 11636-11646. 2013 The influence of major sudden stratospheric warming and elevated stratopause events on the effects of energetic particle precipitation in WACCM. Journal of Geophysical Research: Atmospheres. 2013 Middle atmospheric changes caused by the January and March 2012 solar proton events 2013 Nighttime secondary ozone layer during major stratospheric sudden warmings in specified-dynamics WACCM. Journal of Geophysical Research: Atmospheres. 8346-8358. 2013 Satellite observations of ozone in the upper mesosphere. Journal of Geophysical Research: Atmospheres. 5803-5821. 2013 The solar proton events in 2012 as observed by MIPAS. Geophysical Research Letters. 2339-2343. 2013 A climatology of polar winter stratopause warmings and associated planetary wave breaking. Journal of Geophysical Research: Atmospheres. 4168-4180. 2013 A climatology of the stratopause in WACCM and the zonally asymmetric elevated stratopause. Journal of Geophysical Research: Atmospheres. 2241-2254. 2013 A climatology of elevated stratopause events in the whole atmosphere community climate model. Journal of Geophysical Research: Atmospheres. 1234-1246. 2013 High Resolution Dynamics Limb Sounder observations of the gravity wave-driven elevated stratopause in 2006. Journal of Geophysical Research: Atmospheres. 2012 On the onset of polar mesospheric cloud seasons as observed by SBUV. Journal of Geophysical Research: Atmospheres. 2012 A climatology of stratopause temperature and height in the polar vortex and anticyclones. Journal of Geophysical Research: Atmospheres. 2012 Atmospheric effects of energetic particle precipitation in the Arctic winter 1978-1979 revisited. Journal of Geophysical Research: Atmospheres. 2012 On the seasonal onset of polar mesospheric clouds and the breakdown of the stratospheric polar vortex in the Southern Hemisphere. Journal of Geophysical Research: Atmospheres. 2011 A climatology of cold air outbreaks over North America: WACCM and ERA-40 comparison and analysis. Journal of Geophysical Research: Atmospheres. 2011 Modelling the effect of denitrification on polar ozone depletion for Arctic winter 2004/2005. Atmospheric Chemistry and Physics. 6559-6573. 2011 Gravity wave activity in the Arctic stratosphere and mesosphere during the 2007-2008 and 2008-2009 stratospheric sudden warming events. Journal of Geophysical Research: Atmospheres. 2010 Front-like behavior in the Arctic wintertime upper stratosphere and lower mesosphere. Journal of Geophysical Research: Atmospheres. 2010 Rayleigh lidar observations of reduced gravity wave activity during the formation of an elevated stratopause in 2004 at Chatanika, Alaska (65°N, 147°W). Journal of Geophysical Research: Atmospheres. 2010 Breakdown of potential vorticity-based equivalent latitude as a vortex-centered coordinate in the polar winter mesosphere. Journal of Geophysical Research: Atmospheres. 2009 Intra-seasonal variability of polar mesospheric clouds due to inter-hemispheric coupling. Geophysical Research Letters. 2009 NOx descent in the Arctic middle atmosphere in early 2009. Geophysical Research Letters. 2009 Low-ozone pockets observed by EOS-MLS. Journal of Geophysical Research: Atmospheres. 2008 Numerical simulations of the three-dimensional distribution of meteoric dust in the mesosphere and upper stratosphere. Journal of Geophysical Research: Atmospheres. 2008 Global observations of HNO3 from the High Resolution Dynamics Limb Sounder (HIRDLS): First results. Journal of Geophysical Research: Atmospheres. 2008 High Resolution Dynamics Limb Sounder: Experiment overview, recovery, and validation of initial temperature data. Journal of Geophysical Research: Atmospheres. 2008 Initial validation of ozone measurements from the High Resolution Dynamics Limb Sounder. Journal of Geophysical Research: Atmospheres. 2008 Solar occultation satellite data and derived meteorological products: Sampling issues and comparisons with Aura Microwave Limb Sounder. Journal of Geophysical Research: Atmospheres. 2007 Sensitivity of chemical tracers to meteorological parameters in the MOZART-3 chemical transport model. Journal of Geophysical Research: Atmospheres. 2007 Energetic particle precipitation effects on the Southern Hemisphere stratosphere in 1992-2005. Journal of Geophysical Research: Atmospheres. 2007 Quantifying Arctic ozone loss during the 2004-2005 winter using satellite observations and a chemical transport model. Journal of Geophysical Research: Atmospheres. 2007 Enhanced NOx in 2006 linked to strong upper stratospheric Arctic vortex. Geophysical Research Letters. 2006 Validation of Polar Ozone and Aerosol Measurement (POAM) III version 4 stratospheric water vapor. Journal of Geophysical Research: Atmospheres. 2006 Southern tropical upper tropospheric zonal ozone wave-1 from SAGE II observations (1985-2002). Journal of Geophysical Research: Atmospheres. 2006 Global climatology of inertial instability and Rossby wave breaking in the stratosphere. Journal of Geophysical Research: Atmospheres. 2005 Stratospheric effects of energetic particle precipitation in 2003-2004. Geophysical Research Letters. 2005 2002-2003 Arctic ozone loss deduced from POAM III satellite observations and the SLIMCAT chemical transport model. Atmospheric Chemistry and Physics. 597-609. 2005 On the distribution of ozone in stratospheric anticyclones. Journal of Geophysical Research: Atmospheres. 2004 The Nimbus 7 LIMS version 6 radiance conditioning and temperature retrieval methods and results. Journal of Quantitative Spectroscopy and Radiative Transfer. 395-424. 2004 SAGE III observations of Arctic polar stratospheric clouds - December 2002. Geophysical Research Letters. 2003 On the verification of the quality of SABER temperature, geopotential height, and wind fields by comparison with Met Office assimilated analyses. Journal of Geophysical Research: Atmospheres. 2003 Large-scale chemical evolution of the Arctic vortex during the 1999/2000 winter: HALOE/POAM III Lagrangian photochemical modeling for the SAGE III-Ozone Loss and Validation Experiment (SOLVE) campaign. Journal of Geophysical Research: Atmospheres. 2002 A climatology of stratospheric polar vortices and anticyclones. Journal of Geophysical Research. 2002 Tropical aerosol in the Aleutian High. Journal of Geophysical Research: Atmospheres. 6281-6290. 1999 Mean winds in the tropical stratosphere and mesosphere during January 1993, March 1994, and August 1994. Journal of Geophysical Research: Atmospheres. 26033-26052. 1997 A climatology of the Aleutian high. Journal of the Atmospheric Sciences. 2088-2101. 1996
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