[PHOTO]

Ian Folkins (Retired January 1 2025)

Academic Background

1981 - 1986: BSc in Physics, Dalhousie University
1986 - 1991: MSc and PhD in Physics, University of Toronto, Condensed Matter Theory
1991 - 1993: Post-doc at the National Center for Atmospheric Research, Boulder, Colorado
1993 - 2024: Assistant and Associate Professor, Dalhousie University
2025 - present: Retired Adjunct professor

Cloud Pictures

Atmospheric Chemistry (Fall 2020)

Atmospheric Dynamics I (Fall 2020)

Atmospheric Dynamics II (Winter 2024)

Introduction to Atmospheric Science (Fall 2019)

Atmospheric Physics (Winter 2024)

Publications

A Toy Model of the Madden-Julian Oscillation

Ian Folkins

Toy Model Main Program

Toy Model Help Program (Thermodynamic Solvers)

Nocturnal Relative Humidity Maxima above the Boundary Layer in the U.S. Midwest: A Diagnostic for the Mountain–Plains Solenoidal Circulation

A. Mercer, R. Chang, and I. Folkins, Mon Wea. Rev. 106, 641 - 658, DOI: 10.1175/MWR-D-17-0189.1, 2018.

Anomaly patterns about strong convective events in the tropics and mid-latitudes: observations from radiosondes and surface weather stations,

T. Mitovski and I. Folkins, J. Geophys. Res. Atmos., 119, 385-406, doi:10.1002/2013JD020447, 2014.

A simple way to improve the diurnal cycle in convective rainfall over land in climate models,

Ian Folkins, T. Mitovskii and J. R. Pierce, J. Geophys. Res. Atmos., 119, doi:10.1002/2013JD020149, 2014.

Improved statistical downscaling of general circulation models,

M. L. Titus, J. Sheng, R. J. Greatbatch, I. Folkins, Atmosphere-Ocean, 51 (2), 213-225, 2013.

The melting level stability anomaly in the tropics,

I. Folkins, Atmos. Chem. Phys., 13, 1167-1176, 2013.

Testing convective transport on short timescales: comparisons with mass divergence and ozone anomaly patterns about high rain events,

Toni Mitovski, I. Folkins, R. V. Martin, and M. Cooper, J. Geophys. Res., 117, D02109, doi:10.1029/2011JD016321, 2012.

Temperature, Relative Humidity, and Divergence Response to High Rainfall Events in the Tropics: Observations and Models

Toni Mitovski, I. Folkins, K von Salzen, and M. Sigmond, Journal of Climate, 23, 3613 - 3625, July 2010.

A one-dimensional cloud model with trimodal convective outflow

Ian Folkins, Journal of Climate, 22, 6437 - 6455, 2009.

Tropical tropopause layer

Fueglistaler, S., A. E. Dessler, T. J. Dunkerton, I. Folkins, Q. Fu, and P. W. Mote, 2009: Tropical tropopause layer, Rev. Geophys., 47, RG1004, doi:10.1029/2008RG000267, February 2009.

A Low-Level Circulation in the Tropics

Folkins, I., S. Fueglistaler, G. Lesins, and T. Mitovski, J. Atmos. Sci., 65, 1019 - 1034, 2008.

Martin, R.V., B. Sauvage, I. Folkins, C.E. Sioris, C. Boone, P. Bernath, and J.R. Ziemke, Space-based constraints on the production of nitric oxide by lightning, J. Geophys. Res., 112, D09309, doi:10.1029/2006JD007831, 2007.

Seasonal cycles of O3, CO, and convective outflow at the tropical tropopause

Folkins, I., P. Bernath, C. Boone, G. Lesins, N. Livesey, A. M. Thompson, K. Walker, and J. C. Witte (2006), Geophys. Res. Lett., 33, L16802, doi:10.1029/2006GL026602.

Testing convective parameterizations with tropical measurements of HNO3, CO, H2O, and O3: Implications for the water vapor budget

Folkins, I., P. Bernath, C. Boone, L. J. Donner, A. Eldering, G. Lesins, R. V. Martin, B.-M. Sinnhuber, and K. Walker (2006), J. Geophys. Res., 111, D23304, doi:10.1029/2006JD007325.

Convective damping of buoyancy anomalies and its effect on lapse rates in the tropical lower troposphere

Ian Folkins, Atmos. Chem. Phys., 6, 1-12, 2006.

Estimating the contribution of bromoform to stratospheric bromine and its relation to dehydration in the tropical tropopause layer

B.-M. Sinnhuber and I. Folkins, Atmos. Chem. Phys., 6, 4755 - 4761, 2006.

Temperatures, Transport, and Chemistry in the TTL Ian Folkins, SPARC Newsletter 25 - July 2005,

ONLINE VERSION

The vertical structure of tropical convection, and its impact on the budgets of water vapor and ozone

Ian Folkins and Randall Martin, J. Atmos. Sci., 62, 1560 - 1573, 2005.

Tropical rainfall and boundary layer entropy

Ian Folkins and Chris Braun, J. Clim. 16, 1807 - 1820, 2003.

A simple explanation for the increase in relative humidity between 11 and 14 km in the tropics

Ian Folkins, K. K. Kelly, and E. M. Weinstock, J. Geophys. Res. 107, 10.1029/2002JD002185, 14 December 2002, 2002.

Tropical ozone as an indicator of deep convection

Ian Folkins, C. Braun, A. M. Thompson, and J. C. Witte, J. Geophys. Res., 10.1029/2001JD001178, 12 July 2002

Origin of lapse rate changes in the upper tropical troposphere

Ian Folkins, J. Atmos. Sci., 59, 992 - 1005, (2002).

Mercury flux measurements over air and water on Kejimkujik National Park, Nova Scotia

F. S. Boudala, I. Folkins, S. Beauchamp, R. Tordon, J. Neima, and B. Johnson, Water Air Soil Pollut., 122, 183 - 202, (2000).

A relationship between convective outflow and surface equivalent potential temperatures in the tropics

I. Folkins, S. J. Oltmans, and A. Thompson, Geophys. Res. Lett. 27, 2549-2552, (2000).

Impact of acetone on ozone production and OH in the upper troposphere at high NO

Ian Folkins and Robert Chatfield, J. Geophys. Res. 105, 11585-11599, (2000).

A barrier to vertical mixing at 14 km in the tropics: Evidence from ozonesondes and aircraft measurements

Ian Folkins, M. Loewenstein, J. Podolske, S. Oltmans, and M. Proffitt, J. Geophys. Res., 104, 22095-22102, (1999).

Ozone production efficiencies of acetone and peroxides in the upper troposphere

Ian Folkins, R. Chatfield, H. Singh, Y. Chen, and B. Heikes, Geophys. Res. Lett., 25, 1305 - 1308, (1998).

OH, HO₂, NO, and O₃ in two biomass burning plumes: Implications for ozone production

Ian Folkins, P. Wennberg, T. Hanisco, J. G. Anderson. R. Salawitch, Geophys. Res. Lett., 24, 3185-3188, (1997).

Large scale enhancements in NO/NO_y from subsonic aircraft emissions: Comparisons with Observations

Jacquelyn Witte, I. Folkins, J. Neima, B. Ridley, J. Walega, and A. Weinheimmer, J. Geophys. Res., 102, 28,169-28,175, (1997).

Biomass burning and deep convection in Southeast Asia: Results from ASHOE/MAESA

Folkins, I., R. Chatfield, D. Baumgardner, and M. Proffitt, J. Geophys. Res., 102, 13291-13299, (1997).

Ozone and potential vorticity at the subtropical tropopause break

Ian Folkins and Christof Appenzeller, J. Geophys. Res., 101, 18787-18792, (1996).

I. Folkins, G. Brasseur and Claire Granier, Comparison of models of middle atmosphere composition with observations, Chapter 11 of Adv. Space. Res. 18, 241-254, (1996).

I. A. Folkins, A. J. Weinheimer, B. A. Ridley, J. G. Walega, B. Anderson, J. E. Collins, G. Sachse, R. F. Pueschel, D. R. Blake, O₃, NO_y, and NO_x/NO_y in the upper troposphere of the Equatorial Pacific, J. Geophys. Res., 100, 20913-20926, (1995).

Lefevre, F., G. Brasseur, I. Folkins, A. Smith, and P. Simon, Chemistry of the 1991-92 stratospheric winter: Three-dimensional model simulations, J. Geophys. Res., 99, 8183-8191, (1994).

I. A. Folkins, A. J. Weinheimer, Guy Brasseur, Franck Lefevre, Brian A. Ridley, James G. Walega, James E. Collins, and R. F. Pueschel, Three-dimensional model interpretation of NO_x measurements from the lower stratosphere, J. Geophys. Res., 99, 23117-23129, (1994).

Ian Folkins and Guy Brasseur, The Chemical Mechanisms Behind Ozone Depletion, Chemistry and Industry, April 20, pp 294-297, (1992).

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