Cynthia Twohy

Organization

NorthWest Research Associates

Email

Contact person by email

Business Address

PO Box 3027
Bellevue, WA 98009-3027
United States

First Author Publications

Twohy, C.H., et al. (2021), Deep convection as a source of new particles in the midlatitude upper troposphere, J. Geophys. Res., 107, 4560, doi:10.1029/2001JD000323.
Twohy, C.H., et al. (2017), Saharan dust, convective lofting, aerosol enhancement zones, and potential impacts on ice nucleation in the tropical upper troposphere, J. Geophys. Res., 122, 8833-8851, doi:10.1002/2017JD026933.
Twohy, C.H. (2015), Measurements of Saharan Dust in Convective Clouds over the Tropical Eastern Atlantic Ocean*, J. Atmos. Sci., 72, 75-81, doi:10.1175/JAS-D-14-0133.1.
Twohy, C.H. (2009), Dust Devilry: Saharan dust particles nucleate droplets in eastern Atlantic clouds, Nature Research Highlight, 457, 514-515, doi:10.1038/457514f.
Twohy, C.H., et al. (2009), Saharan dust particles nucleate droplets in eastern Atlantic clouds, Geophys. Res. Lett., 36, L01807, doi:10.1029/2008GL035846.
Twohy, C.H., and M.R. Poellot (2005), Chemical characteristics of ice residual nuclei in anvil cirrus clouds: evidence for homogeneous and heterogeneous ice formation, Atmos. Chem. Phys., 5, 2289-2297, doi:10.5194/acp-5-2289-2005.
Twohy, C.H., and B.W. Gandrud (1998), Electron microscope analysis of residual particles from aircraft contrails, Geophys. Res. Lett., 25, 1359-1362, doi:10.1029/97GL03162.
Twohy, C.H., et al. (1997), Measurement of condensed water content in liquid and ice clouds using an airborne counterflow virtual impactor, J. Atmos. Oceanic Technol., 14, 197-202.

Note: Only publications that have been uploaded to the ESD Publications database are listed here.

Co-Authored Publications

Cziczo, D.J., et al. (2013), Clarifying the Dominant Sources and Mechanisms of Cirrus Cloud Formation, Science, 340, 1320-1324.
Baumgardner, D., et al. (2012), In Situ, Airborne Instrumentation: Addressing and Solving Measurement Problems in Ice Clouds, Bull. Am. Meteorol. Soc., ES29-ES34.
Chen, G., et al. (2011), Observations of Saharan dust microphysical and optical properties from the Eastern Atlantic during NAMMA airborne field campaign, Atmos. Chem. Phys., 11, 723-740, doi:10.5194/acp-11-723-2011.
Stith, J.L., et al. (2011), Observations of ice nuclei and heterogeneous freezing in a Western Pacific extratropical storm, Atmos. Chem. Phys., 11, 6229-6243, doi:10.5194/acp-11-6229-2011.
Avery, M.A., et al. (2010), Convective distribution of tropospheric ozone and tracers in the Central American ITCZ region: Evidence from observations during TC4, J. Geophys. Res., 115, D00J21, doi:10.1029/2009JD013450.
DeMott, P.J., et al. (2010), Predicting global atmospheric ice nuclei distributions and their impacts on climate, Proc. Natl. Acad. Sci., 11217-11222, doi:10.1073/pnas.0910818107.
Eidhammer, T., et al. (2010), Ice Initiation by Aerosol Particles: Measured and Predicted Ice Nuclei Concentrations versus Measured Ice Crystal Concentrations in an Orographic Wave Cloud, J. Atmos. Sci., 67, 2417-2436, doi:10.1175/2010JAS3266.1.
HEYMSFIELD, A.J., et al. (2010), Improved Representation of Ice Particle Masses Based on Observations in Natural Clouds, J. Atmos. Sci., 67, 3303-3318, doi:10.1175/2010JAS3507.1.
Scheuer, E., et al. (2010), Evidence of nitric acid uptake in warm cirrus anvil clouds during the NASA TC4 campaign, J. Geophys. Res., 115, D00J03, doi:10.1029/2009JD012716.
Tian, L., et al. (2010), A Study of Cirrus Ice Particle Size Distribution Using TC4 Observations, J. Atmos. Sci., 67, 195-216, doi:10.1175/2009JAS3114.1.
Zipser, E.J., et al. (2009), The Saharan Air Layer And The Fate Of African Easterly Waves: NASA’s AMMA Field Study of Tropical Cyclogenesis, Bull. Am. Meteorol. Soc., 1137-1156, doi:10.1175/2009BAMS2728.1.
Field, P., et al. (2008), Determination of the Combined Ventilation Factor and Capacitance for Ice Crystal Aggregates from Airborne Observations in a Tropical Anvil Cloud, J. Atmos. Sci., 65, 376-391, doi:10.1175/2007JAS2391.1.
Davis, S., et al. (2007), Comparisons of in situ measurements of cirrus cloud ice water content, J. Geophys. Res., 112, D10212, doi:10.1029/2006JD008214.
HEYMSFIELD, A.J., et al. (2007), Refinements to Ice Particle Mass Dimensional and Terminal Velocity Relationships for Ice Clouds. Part I: Temperature Dependence, J. Atmos. Sci., 64, 1047-1067, doi:10.1175/JAS3890.1.
HEYMSFIELD, A.J., et al. (2007), Reply, J. Atmos. Oceanic Technol., 24, 1511-1518, doi:10.1175/JTECH2077.1.
Park, S., et al. (2007), The CO2 tracer clock for the Tropical Tropopause Layer, Atmos. Chem. Phys., 7, 3989-4000, doi:10.5194/acp-7-3989-2007.
Prenni, A., et al. (2007), Examinations of ice formation processes in Florida cumuli using ice nuclei measurements of anvil ice crystal particle residues, J. Geophys. Res., 112, D10221, doi:10.1029/2006JD007549.
Clement, C., et al. (2006), Analytic and numerical calculations of the formation of a sulphuric acid aerosol in the upper troposphere, Aerosol Science, 37, 1717-1729, doi:10.1016/j.jaerosci.2006.06.007.
HEYMSFIELD, A.J., et al. (2006), Effective Radius of Ice Cloud Particle Populations Derived from Aircraft Probes, J. Atmos. Oceanic Technol., 23, 361-380.
Mace, G.G., et al. (2006), Cloud radiative forcing at the Atmospheric Radiation Measurement Program Climate Research Facility: 1. Technique, validation, and comparison to satellite-derived diagnostic quantities, J. Geophys. Res., 111, D11S90, doi:10.1029/2005JD005921.
Garrett, T., et al. (2005), Evolution of a Florida Cirrus Anvil, J. Atmos. Sci., 62, 2352-2372.
HEYMSFIELD, A.J., et al. (2005), Homogeneous Ice Nucleation in Subtropical and Tropical Convection and Its Influence on Cirrus Anvil Microphysics, J. Atmos. Sci., 62, 41-64.
HEYMSFIELD, A.J., et al. (2004), Effective Ice Particle Densities Derived from Aircraft Data, J. Atmos. Sci., 61, 982.
Garrett, T., et al. (2003), Small, highly reflective ice crystals in low-latitude cirrus, Geophys. Res. Lett., 30, 2132, doi:10.1029/2003GL018153.
Jensen, E.J., et al. (2001), Prevalence of Ice-supersaturated regions in the upper troposphere: Implications for optically thin ice cloud formation, J. Geophys. Res., 106, 17253-17266.

Note: Only publications that have been uploaded to the ESD Publications database are listed here.

National Aeronautics and Space Administration

National Aeronautics and
Space Administration