CLOUD PROCESSES RESEARCH GROUP


Susan C. van den Heever
Monfort Professor
 

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Adele Igel

Adele Igel


adele.igel (at) colostate.edu
(970) 491-8592
About Me: I have always had an interest in the weather, and it was during an internship at my local NWS forecast office that realized I wanted to pursue meteorology academically. Currently I am studying the modeling of cloud microphysics, from single-moment schemes through to bin schemes. Outside of research, I enjoy hiking and skiing with my husband Matt, as well as cooking and most crafts involving yarn, thread, or fabric.
 
Education: Ph.D. in Atmospheric Science, 2015 Colorado State University
   Dissertation: A Theoretical and Numerical Investigation of Warm-Phase Microphysical Processes
M.S. in Atmospheric Science, 2012 Colorado State University
   Thesis: Latent Heating and Cloud Processes in Warm Fronts
B.S. in Physics and in Meteorology, 2010, North Carolina State University
 
Awards: 2015 Alumni Award - Dept. of Atmospheric Science
2015 IGBP Travel Grant to attend the AGU Fall Meeting
2015 AMS Travel Grant to attend the AMS Mesoscale Meeting
2014 NSF GROW Award - Award is for 3 months travel to work with Annica Ekman at Stockholm Univeristy
2013 Herbert Riehl Memorial Award
2010 NSF Graduate Research Fellowship Recipient
2009 AMS Graduate Fellowship Recipient
 
Highlighted Research: Aerosol Impacts in Arctic Clouds
 
Publications: Igel, A. L., M. R. Igel, and S. C. van den Heever, 2015: Make it a double? Sobering results from single- and double-moment microphysics simulations. J. Atmos. Sci. 72, 910-925. [Link]
There are many papers in the published literature that demonstrate that double-moment microphysics schemes produce more accurate simulations than single-moment schemes. This paper summarizes those results and systematically argues for the use of double-moment schemes. These figures demonstrate that there is a wide variability in hydrometeor properties that cannot be captured by single-moment schemes. In our work we found was that the single-moment scheme under-predicted the low-level cloud fraction substantially in radiative-convective equilibrium simulations.

Igel, A. L., S. C. van den Heever, 2014: The role of latent heating in warm frontogenesis. Q. J. Roy. Meteor. Soc. 140, 139-150. [Link]
Panels from Figures 8, 11, and 12 showing the role of latent heating in frontogenesis, frontal stability, and the frontal slope. The values in the first two panels are combined mathematically to arrive at the values in the third panel. The results indicate that one impact of latent heating is to weaken the warm front in the sense that the slope is reduced and thus weaker vertical velocities may be expected.

Igel, A. L., S. C. van den Heever, C. M. Naud, S. M. Saleeby, and D. J. Posselt, 2013: Sensitivity of warm frontal processes to cloud-nucleating aerosol concentrations. J. Atmos. Sci. 70, 1768-1783. [Link]

Fig. 13. Summary schematic showing the changes to the microphysical properties of the mixed-phase portion of the warm-frontal cloud and the total precipitation. Vapor deposition onto pristine ice, snow and aggregates (PSA) increases (as indicated by the change in arrow thickness) while riming of the mixed-phase species (GH) decreases. These two trends in the growth of ice mass cancel one another resulting in little change in the total ice mass and little change in rain production through melting. Differences in size and number of hydrometeors between the clean and polluted scenarios indicate qualitative changes.

Fallest, D. W., A. M. Lichtenberger, C. J. Fox, and K. E. Daniels, 2010: Fluorescent visualization of a spreading surfactant. New J. Phys. 12, 073029. [Link]

Meskhidze, N., L. A. Remer, S. Platnick, R. N. Juarez, A. M. Lichtenberger, and A.R. Aiyyer (2009), Exploring the differences in cloud properties observed by the Terra and Aqua MODIS Sensors, Atmos. Chem. Phys., 9, 3461-3475. [Link]
 
Conference Presentations: Igel, A. L. and S. C. van den Heever (2016), The cloud droplet relative dispersion effect - Does it exist? AMS 96th Annual Meeting, New Orleans, LA. (P)

Igel, A. L., A. M. L. Ekman, C. Leck, J. Savre, M. Tjernström, and J. Sedlar (2015), The influence of free tropospheric aerosol on the boundary layer aerosol budget in the Arctic. AGU Fall Meeting, San Francisco, CA. (O)

Igel, A. L. and S. C. van den Heever (2014), Investigation of the Gamma Distribution Shape Parameter in Shallow Cumulus Clouds. AGU Fall Meeting, San Francisco, CA. (P)

Igel, A. L. and S. C. van den Heever (2014), A comparison of bin-emulating and spectral bin microphysics schemes in RAMS. AMS 14th Conference on Cloud Physics, Boston, MA. (P)

Igel, A. L. and S. C. van den Heever (2014), Aerosol impacts in continental shallow cumuli using bin and bulk microphysical schemes. EGU General Assembly 2014, Vienna, Austria. (P)

Igel, A. L. and S. C. van den Heever (2014), Aerosol impacts in shallow convection as simulated by bin and bulk microphysical schemes in RAMS. AMS 94th Annual Meeting, Atlanta, GA. (O)

Igel, A. L., S. M. Saleeby, L. D. Grant, and S. C. van den Heever (2013), Feedbacks between vertical velocity and microphysical processes in a single-column model. AGU Fall Meeting, San Francisco, CA. (P)

Parker, E., Igel, A. L. and S. C. van den Heever (2013), The impact of one- and two-moment microphysical schemes on precipitation in an ordinary thunderstorm. AGU Fall Meeting, San Francisco, CA. (P)

Igel, A. L., S. C. van den Heever, C. M. Naud, S. M. Saleeby, and D. J. Posselt (2013), Impacts of cloud condensation nuclei on deep stratus clouds. 19th International Conference on Nucleation and Atmospheric Aerosols, Fort Collins, CO. (O)

Igel, A. L., S. C. van den Heever, S. M. Saleeby, C. M. Naud, and D. J. Posselt (2012), Warm frontal cloud response to cloud-nucleating aerosols, AGU Fall Meeting, San Francisco, CA. (P)

Igel, A. L., S. C. van den Heever, S. M. Saleeby, C. M. Naud, and D. J. Posselt (2011),Indirect effects of aerosols on warm frontal processes, AMS 14th Conf. on Mesoscale Processes. (O)

Posselt, D., C. Naud, S. van den Heever, and A. Lichtenberger (2010), A-Train-Based examination of the relationship between aerosols, cloud vertical structure, and cloud radiative forcing in midlatitude cyclones, A-Train Symposium (P)

Lichtenberger, A. M., W. J. Shaw, L. K. Berg, C. M. Berkowitz, J. A. Ogren,and E. Andrews (2008), Digital inversion and initial analysis of nephelometer data from the CHAPS campaign, Eos Trans. AGU, 89(53), Fall Meet. Suppl.(P)

Lichtenberger, A. M., and S. Zubrick, (2007), A comparison of precipitable water measurements from radiosondes, ground-based GPS receivers and GOES sounders., NWA Annual Meet. (P)
 
Mentoring: Summer 2013: CMMAP Student Intern (Emily Parker)
 
TA Experience: Fall 2015: ATS620 - Thermodynamics and Cloud Physics
Spring 2013: ATS780 - Cloud Microphysical Analysis and Modeling
Fall 2011: ATS540 - Introduction to Weather and Climate
 
Field Experience: Dec 2011-Jan2012: DYNAMO radar operator on board the R/V Revelle
 
Last updated: 3/2016

Prof. Susan C. van den Heever
Monfort Professor
Department of Atmospheric Science
Colorado State University
Fort Collins, Colorado, USA
email: sue (at) atmos.colostate.edu

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