C14 measurements from Beachon Rombas Campaign
Manitou Experimental Forest, Colorado, July/August 2011
PIs:  Chris Geron and John Offenberg:

Contact information:
Chris Geron
Senior Scientist
U.S. Environmental Protection Agency
National Risk Management Research Laboratory
Mail Drop E305-02, 109 TW Alexander Dr.
Research Triangle Park, NC 27711
Phone (919) 541-4639
Fax (919) 541-7885
Geron.chris@epa.gov

Filter samplers:  
Tisch 220 Liters per minute (volumetric) samplers.  
PM2.5 cyclone used to exclude all but PM2.5 aerosol.
Sampled for 71.5 hours with filter changes at 4-6pm local time (MST).
Exception:  Filter 1 (day of year 206) = 23.5 hour sample.
90 mm pre-baked Quartz fiber filters; 77mm effective filter diameter
Filters were kept in individual pre-baked sealed packets at -5 C until analysis at RTP, NC.

DOY = Day of Year (July 22, 2011 = 203)
TC is average total PM2.5 carbon concentration for the sampler period in ug/m^3 (Volumetric - Ambient T/P)
OC = organic carbon on filter (area basis):  Units = ug/cm^2
EC = elemental carbon on filter (area basis): Units = ug/cm^2 
fMC = fraction of modern (non-fossil fuel-based) to total C:  unitless
 
Measurement uncertainty
TC: < 5%
fMC:  0.001%
						