TITLE: SP2_ICE-L R0 data
AUTHOR(S): R Subramanian

PI: Gregory L Kok
Droplet Measurement Technologies, 2545 Central Ave, Boulder, CO 80301
Tel: 303-440-5576
E-mail: glkok@dropletmeasurement.com
Data questions: R Subramanian
E-mail: random@dropletmeasurement.com

1.0 DATA SET OVERVIEW:
The single particle soot photometer (SP2) measures black carbon (BC) using laser-induced incandescence.  Non-BC containing particles are detected using scattering at the laser wavelength of 1064 nm.  The SP2 was flown aboard the C-130 during ICE-L, and sampled either ambient air or in-cloud BC through Cynthia Twohy’s counter-flow virtual impactor.
The SP2 dataset uses CVI data from Cynthia Twohy <twohy@coas.oregonstate.edu> and ambient data from “NCAR/NSF C-130 Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data [NCAR/EOL]” files (available at http://data.eol.ucar.edu/codiac/dss/id=105.004), retrieved on 8/21/09.

2.0 INSTRUMENT DESCRIPTION:
Detailed description of the instrument is provided in Baumgardner et al. (2008) and Subramanian et al. (2010).

3.0 DATA FORMAT:
Data are provided as column delimited text files.  Incandescent (BC) and scattering (non-BC) concentrations are presented as 10-second averages.
This is version R0, uploaded to the archives on 2010-08-10.
Data invalidated due to missing ambient temperature and pressure is denoted by 88888.

4.0 DATA REMARKS:
The SP2 performance during ICE-L was limited by the range of the instrument as configured for this campaign, with the incandescence detector saturating at ~10.5 fg-BC/particle.  As a lower bound of the actual BC mass concentration, BC masses that saturate the detector are estimated at the saturation value, and the BC mass concentration is reported as “total incandescent mass.”  “Incandescent mass” does not include these saturated particles.  “Incandescent number” includes all detected particles.  A similar situation arises for the scattering data, with particles that saturated the scattering detector estimated at the saturation size, and included in the “total scattering mass” concentration.

5.0 REFERENCES:
Baumgardner, D., R. Subramanian, C. Twohy, J. Stith, and G. Kok (2008), Scavenging of black carbon by ice crystals over the northern Pacific, Geophys. Res. Lett., 35, L22815, doi:10.1029/2008GL035764.
Subramanian, R., Kok, G. L., Baumgardner, D., Clarke, A., Shinozuka, Y., Campos, T. L., Heizer, C. G., Stephens, B. B., de Foy, B., Voss, P. B., and Zaveri, R. A.: Black carbon over Mexico: the effect of atmospheric transport on mixing state, mass absorption cross-section, and BC/CO ratios, Atmos. Chem. Phys., 10, 219-237, doi:10.5194/acp-10-219-2010, 2010