Calwater Field Campaign
1 February 2011 - 7 March 2011
Lead Scientist: Kimberly Prather
The goal of this project involved determining how aerosols impact clouds and precipitation patterns in California. Specifically flights were conducted through precipitating and non-precipitating clouds to determine whether there were chemical or physical differences in the cloud nuclei forming the clouds. The sources of the key cloud seeds were determined using single particle mass spectrometry. Cloud physics and chemistry were probed in addition to high level meteorological data. Met data were acquired during flights as well as at several sampling ground level sampling sites. The goal was to unravel the key parameters leading to high levels of rain and snow in California versus sustained cloud cover with very little precipitation.
Neiman P, N Gaggini, C Fairall, J Aikins, J Spackman, L Leung, J Fan, J Hardin, N Nalli, and A White. 2017. "An Analysis of Coordinated Observations from NOAA's Ronald Brown Ship and G-IV Aircraft in a Landfalling Atmospheric River over the North Pacific during CalWater-2015." Monthly Weather Review, 145(9), 10.1175/MWR-D-17-0055.1.
Cordeira J, F Ralph, A Martin, N Gaggini, J Spackman, P Neiman, J Rutz, and R Pierce. 2017. "Forecasting Atmospheric Rivers during CalWater 2015." Bulletin of the American Meteorological Society, 98(3), 10.1175/BAMS-D-15-00245.1.
Fan J, L Leung, D Rosenfeld, and P DeMott. 2017. "Effects of cloud condensation nuclei and ice nucleating particles on precipitation processes and supercooled liquid in mixed-phase orographic clouds." Atmospheric Chemistry and Physics, 17(2), 10.5194/acp-17-1017-2017.
Nalli N, C Barnet, T Reale, Q Liu, V Morris, J Spackman, E Joseph, C Tan, B Sun, F Tilley, L Leung, and D Wolfe. 2016. "Satellite Sounder Observations of Contrasting Tropospheric Moisture Transport Regimes: Saharan Air Layers, Hadley Cells, and Atmospheric Rivers." Journal of Hydrometeorology, 17(12), 10.1175/JHM-D-16-0163.1.
Creamean JM, AB White, P Minnis, R Palikonda, DA Spangenberg, and KA Prather. 2016. "The relationships between insoluble precipitation residues, clouds, and precipitation over California’s southern Sierra Nevada during winter storms." Atmospheric Environment, 140, 10.1016/j.atmosenv.2016.06.016.
Creamean JM, AP Ault, AB White, PJ Nieman, FM Ralph, P Minnis, and KA Prather. 2015. "Impact of interannual variations in sources of insoluble aerosol species on orographic precipitation over California's central Sierra Nevada." Atmospheric Chemistry and Physics, 15(11), 10.5194/acp-15-6535-2015.
Fan J, LR Leung, PJ DeMott, JM Comstock, B Singh, D Rosenfeld, JM Tomlinson, A White, KA Prather, P Minnis, JK Ayers, and Q Min. 2014. "Aerosol impacts on California winter clouds and precipitation during CalWater 2011: local pollution versus long-range transported dust." Atmospheric Chemistry and Physics, 14(1), 10.5194/acp-14-81-2014.
Rosenfeld D, R Chemke, K Prather, K Suski, J Comstock, B Schmid, J Tomlinson, and H Jonsson. 2014. "Polluting of winter convective clouds upon transition from ocean inland over Central California: Contrasting Case Studies." Atmospheric Research, 135-136, 10.1016/j.atmosres.2013.09.006.
Rosenfeld D, R Chemke, P DeMott, RC Sullivan, R Rasmussen, F McDonough, JM Comstock, B Schmid, J Tomlinson, H Jonsson, K Suski, A Cazorla, and K Prather. 2013. "The common occurrence of highly supercooled drizzle and rain near the coastal regions of the western United States." Journal of Geophysical Research: Atmospheres, 118(17), 10.1002/jgrd.50529.
Cazorla A, R Bahadur, KJ Suski, JF Cahill, D Chand, B Schmid, V Ramanathan, and K Prather. 2013. "Relating aerosol absorption due to soot, organic carbon, and dust to emission sources determined from in-situ chemical measurements." Atmospheric Chemistry and Physics, 13(18), 10.5194/acp-13-9337-2013.
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Campaign Data Sets
|IOP Participant||Data Source Name||Final Data|
|Duli Chand||Nephelometer||Order Data|
|Duli Chand||Particle Soot Absorption Photometer||Order Data|
|Jennifer Comstock||2D-Stereo Optical Array Probe||Order Data|
|Jennifer Comstock||High Volume Precip Spectrometer||Order Data|
|Paul DeMott||Continuous Flow Thermal Diffusion Chamber||Order Data|
|John Hubbe||Meteorology/State/Position Parameters- G1 Aircraft||Order Data|
|Haflidi Jonsson||Cloud Imaging Probe||Order Data|
|Haflidi Jonsson||Cloud and Aerosol Spectrometer (CAS)||Order Data|
|Haflidi Jonsson||Liquid Water Content (pvm-100a probe, SEA WCM-2000)||Order Data|
|Athanasios Nenes||Cloud Condensation Nuclei Counter||Order Data|
|Kimberly Prather||Aerosol Time-of-Flight Mass Spectrometer||Order Data|
|Greg Roberts||Mini CCN Spectrometer Data||Order Data|
|Jason Tomlinson||Cloud Droplet Probe (CDP) and Cloud Spectrometer and Impactor (CSI)||Order Data|
|Jason Tomlinson||Condensation Particle Counters||Order Data|
|Jason Tomlinson||Passive Cavity Aerosol Spectrometer||Order Data|
|Jason Tomlinson||Ultra High Sensitivity Aerosol Spectrometer||Order Data|
|Jason Tomlinson||Video||Order Data|
|Xiao-Ying Yu||Trace Gases||Order Data|