Two-Column Aerosol Project (TCAP)
1 July 2012 - 30 June 2013
Lead Scientist: Larry Berg
Observatory: AMF, PVC
There remain many key knowledge gaps despite advances in the scientific understanding of how aerosols and clouds evolve and affect climate. Many climatically important processes depend on particles that undergo continuous changes within a size range spanning a few nanometers to a few microns, and with compositions that consist of a variety of carbonaceous materials, soluble inorganic salts and acids and insoluble mineral dust. Primary particles, which are externally-mixed when emitted, are subject to coagulation and chemical changes associated with the condensation of semi-volatile gases to their surface resulting in a spectrum of compositions or mixing-states with a range of climate-affecting optical and hygroscopic properties. The numerical treatments of aerosol transformation and cloud-aerosol interactions are highly simplified in large-scale models, contributing to the uncertainties associated with aerosol direct and indirect forcing in climate models used to determine safe levels of greenhouse gases for the Earth system.
This campaign was designed to provide a detailed set of observations with which to:
- perform radiative and cloud condensation nuclei (CCN) closure studies
- evaluate a new retrieval algorithm for aerosol optical depth (AOD) in the presence of clouds using passive remote sensing
- extend a previously developed technique to investigate aerosol indirect effects, and
- evaluate the performance of a detailed regional-scale model and a more parameterized global-scale model in simulating particle activation and AOD associated with the aging of anthropogenic aerosols.
To meet these science objectives, the ARM Mobile Facility (AMF) and the Mobile Aerosol Observing System (MAOS) was deployed on Cape Cod, Massachusetts, for a 12-month period starting in the summer of 2012 in order to quantify aerosol properties, radiation, and cloud characteristics at a location subject to both clear and cloudy conditions, and clean and polluted conditions. These observations were supplemented by two aircraft intensive observational periods, one in the summer and a second in the winter. Each intensive observational period required two aircraft.
Niple ER, HE Scott, JA Conant, SH Jones, FJ Iannarilli, and WE Pereira. 2016. "Application of oxygen A-band equivalent width to disambiguate downwelling radiances for cloud optical depth measurement." Atmospheric Measurement Techniques, 9(9), amt-9-4167-2016, 10.5194/amt-9-4167-2016.
Cziczo D. 2016. Understanding the Effect of Aerosol Properties on Cloud Droplet Formation during TCAP Field Campaign Report. Ed. by Robert Stafford, DOE ARM Climate Research Facility. DOE/SC-ARM-15-055.
Shinozuka Y, AD Clarke, A Nenes, A Jefferson, R Wood, CS McNaughton, J Strom, P Tunved, J Redemann, KL Thornhill, RH Moore, TL Lathem, JJ Lin, and YJ Yoon. 2015. "The relationship between cloud condensation nuclei (CCN) concentration and light extinction of dried particles: indications of underlying aerosol processes and implications for satellite-based CCN estimates." Atmospheric Chemistry and Physics, 15(13), 10.5194/acp-15-7585-2015.
Kassianov E, J Barnard, M Pekour, LK Berg, J Shilling, C Flynn, F Mei, and A Jefferson. 2014. "Simultaneous retrieval of effective refractive index and density from size distribution and light scattering data: Weakly absorbing aerosol." Atmospheric Measurement Techniques, 7, 10.5194/amt-7-3247-2014.
Titos G, A Jefferson, PJ Sheridan, E Andrews, H Lyamani, L Alados-Arboledas, and JA Ogren. 2014. "Aerosol light-scattering enhancement due to water uptake during the TCAP campaign." Atmospheric Chemistry and Physics, 14(13), 10.5194/acp-14-7031-2014.
Lamer K, A Taterevic, I Jo, and P Kollias. 2013. "Evaluation of gridded Scanning ARM Cloud Radar reflectivity observations and vertical Doppler velocity retrievals." Atmospheric Measurement Techniques Discussions, 6(6), 10.5194/amtd-6-9579-2013.
Aiken A, M Dubey, and S Liu. 2013. PASS3 Measurements from Two DOE ARM Aerosol Observing Systems (AOS): SGP and the Recent MAOS Deployments for PACE and TCAP. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.
Chand D, L Berg, J Fast, B Schmid, J Barnard, C Berkowitz, E Chapman, J Comstock, C Flynn, J Hubbe, E Kassianov, C Kluzek, M Pekour, A Sedlacek, J Shilling, Y Shinozuka, J Tomlinson, J Wilson, and A Zelenyuk-Imre. 2013. In situ derived aerosol optical properties during the TCAP Phase-I Campaign. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.
Senum G and J Tomlinson. 2013. Aerosol Flux Measurements in CARES and TCAP. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.
Miller M, V Ghate, S Decker, and B Raney. 2013. Forward Modeling of Radar Observables Using a Large-eddy Simulation Model: A New Approach to Optimization of Cloud Radar Scan Strategies. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.
View All Related Publications
Campaign Data Sets
|IOP Participant||Data Source Name||Final Data|
|Brian Cairns||Research Scanning Polarimeter- B200 Aircraft||Order Data|
|Duli Chand||Nephelometer - G1 Aircraft||Order Data|
|Duli Chand||Particle Soot Absorption Photometer - G1 Aircraft||Order Data|
|Duli Chand||f_RH - G1 Aircraft||Order Data|
|Jennifer Comstock||Altitude Data - G1 Aircraft||Order Data|
|Jennifer Comstock||Cloud Aerosol Precip Spectrometer- G1 Aircraft||Order Data|
|Jennifer Comstock||Cloud Droplet Probe - G1 Aircraft||Order Data|
|Jennifer Comstock||Cloud Imaging Probe - G1 Aircraft||Order Data|
|Jennifer Comstock||Water Content - G1 Aircraft||Order Data|
|Daniel Cziczo||Aerosol Mass Spectrometer||Order Data|
|Daniel Cziczo||Cloud Condensation Nuclei Counter||Order Data|
|Chris Hostetler||High Spectral Resolution Lidar-2 - G1 Aircraft||Order Data|
|John Hubbe||Meteorology/State/Position Parameters- G1 Aircraft||Order Data|
|Chuck Long||Radiometers - G1 Aircraft||Order Data|
|Joseph Michalsky||MFRSR||Order Data|
|Mikhail Pekour||Aerodynamic Particle Sizer||Order Data|
|Mikhail Pekour||Counterflow Virtual Impactor Inlet - G1 Aircraft||Order Data|
|Phil Russell||4STAR - Aerosol Optical Depth||Order Data|
|Phil Russell||4STAR - Columnar Water Vapor - G1 Aircraft||Order Data|
|Herman Scott||Three Waveband Spectrally-agile Technique Sensor||Order Data|
|Arthur Sedlacek||Aethalometer||Order Data|
|Arthur Sedlacek||Single Particle Soot Photometer||Order Data|
|Arthur Sedlacek||Single Particle Soot Photometer- G1 Aircraft||Order Data|
|John Shilling||Aerosol Mass Spectrometer- G1 Aircraft||Order Data|
|Stephen Springston||Carbon Monoxide - G1 Aircraft||Order Data|
|Stephen Springston||Meteorological Data||Order Data|
|Stephen Springston||Particle Soot Absorption Photometer||Order Data|
|Stephen Springston||Trace Gases||Order Data|
|Jason Tomlinson||Condensation Particle Counters - G1 Aircraft||Order Data|
|Jason Tomlinson||Dual Column Cloud Condensation Nuclei Counter - G1 Aircraft||Order Data|
|Jason Tomlinson||Video - G1 Aircraft||Order Data|
|Thomas Watson||Particle-Into-Liquid Sampler (PILS)||Order Data|
|Thomas Watson||Particle-Into-Liquid Sampler (PILS)- G1 Aircraft||Order Data|
|Alla Zelenyuk-Imre||Mini Single Particle Mass Spectrometer - G1 Aircraft||Order Data|