2007 Cumulus Humilis Aerosol Process Study (CHAPS)

4 June 2007 - 25 June 2007

Lead Scientist: Carl Berkowitz

Observatory: OSC

The primary goal of this campaign was to characterize and contrast freshly emitted aerosols above, within and below fields of cumulus humilis (or fair-weather cumulus, FWC) and to use these observations to address how below-cloud and above-cloud aerosol optical and cloud nucleating properties differ downwind of a mid-size city relative to similar aerosols in air less affected by emissions. The observations from this campaign can also be used to aid in the development and evaluation of parameterizations of the transformation and transport of these aerosols by FWC for use in regional-scale and Global Climate Models. This final product has the potential to reduce the uncertainties associated with the treatment of aerosols by these models.

During CHAPS, the DOE Gulfstream-1 (G-1) aircraft carried two broad categories of instruments to measure climate-relevant properties of aerosols. One set of instruments measured the properties of aerosols found within individual cloud droplets. The other set of instruments measured these same properties both for aerosols not incorporated into cloud droplets as well as aerosols found outside of the larger cloudy environment. Joining the G-1 was the NASA Langley Research Center’s King Air Be-200. This aircraft had a High Spectral Resolution Lidar (HSRL) onboard to obtain profiles of aerosol backscatter and extinction in the vicinity of these clouds. Measurements were also made of the composition of aerosols inside and outside of the urban plume in order to characterize both activated and interstitial aerosols. Due to the transient nature and the small spatial scale of the individual FWC, this study looked at the aerosol properties in aggregate, rather than data from individual transects through a cloud. Surface measurements made just north of Oklahoma City can be used to continuously characterize aerosol and chemical features within the boundary layer.

Co-Investigators

Larry Berg
Richard Ferrare
Chris Hostetler
John Ogren

Related Publications

2015

Berg LK, M Shrivastava, RC Easter, JD Fast, EG Chapman, Y Liu, and RA Ferrare. 2015. "A new WRF-Chem treatment for studying regional-scale impacts of cloud processes on aerosol and trace gases in parameterized cumuli." Geoscientific Model Development, 8(2), 10.5194/gmd-8-409-2015.

2013

Shrivastava M, L Berg, J Fast, D Easter, A Laskin, E Chapman, W Gustafson, Y Liu, and C Berkowitz. 2013. Modeling Aerosols and Their Interactions with Shallow Cumuli. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.

Shrivastava M, LK Berg, J Fast, R Easter, A Laskin, WI Gustafson, Y Liu, and CM Berkowitz. 2013. "Modeling aerosols and their interactions with shallow cumuli during the 2007 CHAPS field study." Journal of Geophysical Research: Atmospheres, 118(3), 10.1029/2012jd018218.

2011

Farrare R, M Clayton, D Turner, C Hostetler, J Hair, M Obland, R Rogers, A Swanson, A Jefferson, and H Jonsson. 2011. Raman Lidar and HSRL Measurements of Aerosol and Water Vapor Variability. Presented at 2nd Atmospheric System Research (ASR) Science Team Meeting. San Antonio, TX.

Berkowitz C, LK Berg, E Andrews, X Yu, J Ogren, and Y Lee. 2011. Observations of single scattering Albedo made during the 2007 cumulus humilis aerosol processing study: size or composition? Presented at 91th Annual American Meteorological Society (AMS) Meeting. Seattle, WA.

Fast J, M Shrivastava, E Champman, R Ferrare, C Hostetler, and L Berg. 2011. Simulating Aerosols Entrained Into Fair Weather Cumulus During CHAPS. Presented at 2nd Atmospheric System Research (ASR) Science Team Meeting. San Antonio, TX.

Yu X, L Berg, C Berkowitz, Y Lee, L Alexander, J Ogren, and E Andrews. 2011. Size-resolved CCN Composition in Cumulus Humilis. Presented at 2nd Atmospheric System Research (ASR) Science Team Meeting. San Antonio, TX.

2010

Kassianov EI, M Ovchinnikov, LK Berg, SA McFarlane, C Flynn, R Ferrare, C Hostetler, and M Alexandrov. 2010. "Retrieval of aerosol optical depth in vicinity of broken clouds from reflectance ratios: case study." Atmospheric Measurement Techniques, 3(5), 10.5194/amt-3-1333-2010.


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Campaign Data Sets

IOP Participant Data Source Name Final Data
Larry Berg Total Sky Imager- Ground Order Data
Manvendra Dubey Photoacoustic Instrument (CVI inlet) Order Data
Manvendra Dubey Photoacoustic Instrument (ISO inlet) Order Data
Richard Ferrare HSR Lidar Order Data
John Hubbe Passive Cavity Aerosol Spectrometer Probe- G1 Aircraft Order Data
Alexander Laskin Cloud Condensation Nuclei Counter (ISO inlet) Order Data
Alexander Laskin Time Resolved Aerosol Collectors (CVI inlet) Order Data
Alexander Laskin Time Resolved Aerosol Collectors (ISO inlet) Order Data
Yin-Nan Lee Aerosol Mass Spectrometer- G1 Aircraft Order Data
John Ogren Condensation Particle Counter (CVI inlet) Order Data
John Ogren Condensation Particle Counter (ISO inlet) Order Data
John Ogren Nephelometer (CVI inlet) Order Data
John Ogren Nephelometer (ISO inlet) Order Data
John Ogren Particle Soot Absorption Photometer (CVI) Order Data
John Ogren Particle Soot Absorption Photometer (ISO inlet) Order Data
John Ogren Tunable Diode Laser (CVI) Order Data
Jason Olfert Fast Integrated Mobility Spectrometer- G1 Aircraft Order Data
Mikhail Pekour Aerosol Monitoring System- Ground Order Data
Mikhail Pekour Radiosonde- Ground Order Data
Gunnar Senum Cloud Aerosol Precip Spectrometer(CAPS)/Cloud Imaging Probe(CIP) Order Data
Gunnar Senum Cloud Aerosol Precip Spectrometer(CAPS)/Cloud and Aerosol Spectrometer (CAS) Order Data
Jian Wang Differential Mobility Analyzer Order Data