Preprints
https://doi.org/10.5194/egusphere-2022-906
https://doi.org/10.5194/egusphere-2022-906
01 Dec 2022
 | 01 Dec 2022

Systematic analysis of virga and its impact on surface particulate matter observations

Nakul Nitin Karle, Ricardo Kendi Sakai, Rosa Maximilia Fitzgerald, Charles Ichoku, Fernando Mercado, and William Ross Stockwell

Abstract. Studies focusing on virga are rare, even though it is a commonly occurring phenomenon. In this study, we investigated aerosol backscatter profiles from a ceilometer located on the University of Texas at El Paso (UTEP) campus from 2015–2021 to identify virga events. Ceilometer data effectively captured virga events from regular precipitation based on the backscattering intensities. To characterize the virga phenomena, a systematic method was developed using ceilometer profiles, soundings, surface rain gauges, and radar data from the nearest National Weather Service (NWS). A total of 50 virga events were identified during the study period. These events appeared only during a specific time of the year, revealing a seasonal occurrence pattern. We identified and classified these virga events and investigated their impact on the surface measurements recorded by the on-campus Continuous Ambient Air Monitoring Station (CAMS). Virga events were classified as columnar and non-columnar events based on their aerosol profiles. We observed that during some of the columnar virga events, surface PM levels displayed a sudden upward trend indicating aerosol loading in the surface layer after precipitation evaporation. Twenty of the virga events showed a columnar structure out of the fifty identified in this study. More detailed analysis of selected events shows that virga affects regional air quality. A significant result of this study is that analysis of sudden changes in local air quality need to consider the possible effects of virga on the surface layer.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Share

Journal article(s) based on this preprint

02 Mar 2023
Systematic analysis of virga and its impact on surface particulate matter observations
Nakul N. Karle, Ricardo K. Sakai, Rosa M. Fitzgerald, Charles Ichoku, Fernando Mercado, and William R. Stockwell
Atmos. Meas. Tech., 16, 1073–1085, https://doi.org/10.5194/amt-16-1073-2023,https://doi.org/10.5194/amt-16-1073-2023, 2023
Short summary
Download

The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Extensive virga research is uncommon, even though it is a common phenomenon. A systematic method...
Share