Mixed-phase orographic cloud microphysics during StormVEx and IFRACS
Abstract
Wintertime mixed-phase orographic cloud (MPC) measurements were conducted at the Storm Peak Laboratory (SPL) during the Storm Peak Lab Cloud Property Validation Experiment (StormVEx) and Isotopic Fractionation in Snow (IFRACS) programs in 2011 and 2014, respectively. The data include 92 h of simultaneous measurements of supercooled liquid cloud droplet and ice particle size distributions (PSDs). Average cloud droplet number concentration (CDNC), droplet size (NMD), and liquid water content (LWC) were similar in both years, while ice particle concentration (Ni) and ice water content (IWC) were higher during IFRACS. The consistency of the liquid cloud suggests that SPL is essentially a cloud chamber that produces a consistent cloud under moist, westerly flow during the winter. A variable cloud condensation nuclei (CCN)-related inverse relationship between CDNC and NMD strengthened when the data were stratified by LWC. Some of this variation is due to changes in cloud base height below SPL. While there was a weak inverse correlation between LWC and IWC in the data as a whole, a stronger relationship was demonstrated for a case study on 9 February 2014 during IFRACS. A minimum LWC of 0.05 g m–3 showed that the cloud was not completely glaciated on this day. Erosion ofmore »
- Authors:
-
[3];
- Desert Research Inst. (DRI), Reno, NV (United States)
- Desert Research Inst. (DRI), Reno, NV (United States); Univ. of Utah, Salt Lake City, UT (United States)
- ETH Zurich (Switzerland)
- Univ. of Utah, Salt Lake City, UT (United States)
- Publication Date:
- Research Org.:
- Univ. of Nevada, Reno, NV (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1612140
- Grant/Contract Number:
- SC0014304; AGS-1260462
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Atmospheric Chemistry and Physics (Online)
- Additional Journal Information:
- Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 19; Journal Issue: 8; Journal ID: ISSN 1680-7324
- Publisher:
- European Geosciences Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
Citation Formats
Lowenthal, Douglas H., Hallar, A. Gannet, David, Robert O., McCubbin, Ian B., Borys, Randolph D., and Mace, Gerald G. Mixed-phase orographic cloud microphysics during StormVEx and IFRACS. United States: N. p., 2019.
Web. doi:10.5194/acp-19-5387-2019.
Lowenthal, Douglas H., Hallar, A. Gannet, David, Robert O., McCubbin, Ian B., Borys, Randolph D., & Mace, Gerald G. Mixed-phase orographic cloud microphysics during StormVEx and IFRACS. United States. https://doi.org/10.5194/acp-19-5387-2019
Lowenthal, Douglas H., Hallar, A. Gannet, David, Robert O., McCubbin, Ian B., Borys, Randolph D., and Mace, Gerald G. Wed .
"Mixed-phase orographic cloud microphysics during StormVEx and IFRACS". United States. https://doi.org/10.5194/acp-19-5387-2019. https://www.osti.gov/servlets/purl/1612140.
@article{osti_1612140,
title = {Mixed-phase orographic cloud microphysics during StormVEx and IFRACS},
author = {Lowenthal, Douglas H. and Hallar, A. Gannet and David, Robert O. and McCubbin, Ian B. and Borys, Randolph D. and Mace, Gerald G.},
abstractNote = {Wintertime mixed-phase orographic cloud (MPC) measurements were conducted at the Storm Peak Laboratory (SPL) during the Storm Peak Lab Cloud Property Validation Experiment (StormVEx) and Isotopic Fractionation in Snow (IFRACS) programs in 2011 and 2014, respectively. The data include 92 h of simultaneous measurements of supercooled liquid cloud droplet and ice particle size distributions (PSDs). Average cloud droplet number concentration (CDNC), droplet size (NMD), and liquid water content (LWC) were similar in both years, while ice particle concentration (Ni) and ice water content (IWC) were higher during IFRACS. The consistency of the liquid cloud suggests that SPL is essentially a cloud chamber that produces a consistent cloud under moist, westerly flow during the winter. A variable cloud condensation nuclei (CCN)-related inverse relationship between CDNC and NMD strengthened when the data were stratified by LWC. Some of this variation is due to changes in cloud base height below SPL. While there was a weak inverse correlation between LWC and IWC in the data as a whole, a stronger relationship was demonstrated for a case study on 9 February 2014 during IFRACS. A minimum LWC of 0.05 g m–3 showed that the cloud was not completely glaciated on this day. Erosion of the droplet distribution at high IWC was attributed to the Wegener–Bergeron–Findeisen process as the high IWC was accompanied by a 10-fold increase in Ni. A relationship between large cloud droplet concentration (25–35 µm) and small ice particles (75–200 µm) under cold (<–8 °C) but not warm (>–8 °C) conditions during IFRACS suggests primary ice particle production by contact or immersion freezing. The effect of blowing snow was evaluated from the relationship between wind speed and Ni and by comparing the relative (percent) ice particle PSDs at high and low wind speeds. These were similar, contrary to expectation for blowing snow. However, the correlation between wind speed and ice crystal concentration may support this explanation for high crystal concentrations at the surface. Secondary processes could have contributed to high crystal concentrations but there was no direct evidence to support this. Further experimental work is needed to resolve these issues.},
doi = {10.5194/acp-19-5387-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 8,
volume = 19,
place = {United States},
year = {Wed Apr 24 00:00:00 EDT 2019},
month = {Wed Apr 24 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Mixed-phase orographic cloud microphysics during StormVEx and IFRACS
dataset, January 2021
- Lowenthal, Douglas; Hallar, A. Gannet; David, Robert O.
- Dryad
Mixed-phase orographic cloud microphysics during StormVEx and IFRACS
dataset, January 2021
- Lowenthal, Douglas; Hallar, A. Gannet; David, Robert O.
- Dryad