Howell, S
University of Hawaii
Non-refractory aerosol composition from the Aerodyne AMS on the NCAR C-130
PASE

2007 08 10 2008 09 20

Stop_UTC, (number of seconds from 0000 UTC)
6
1 1 1 1 1 1
-9999 -9999 -9999 -9999 -9999 -9999
Start_UTC, seconds
Mid_UTC, seconds
NO3-, micrograms per standard meter cubed (101325 Pa, 273 K)
SO4=, micrograms per standard meter cubed (101325 Pa, 273 K)
NH4+, micrograms per standard meter cubed (101325 Pa, 273 K)
organic matter, micrograms per standard meter cubed (101325 Pa, 273 K)
0
18

PI_CONTACT_INFO: email: sghowell@hawaii.edu; 
		 phone: 808-956-5185; 
		 address: Univ. Hawaii Dep't Ocean 
			  1000 Pope Rd, Honolulu, HI 96822
PLATFORM: NCAR C-130
LOCATION: Contained in aircraft data files.
ASSOCIATED_DATA: N/A

INSTRUMENT_INFO: Aerodyne aerosol mass spectrometer operating in
		 V-mode, with heater near 700 C. This is bulk
		 composition only (no size distributions).

DATA_INFO: Units are micrograms per standard cubic meter (101325 Pa,
		 273 K). Particle sizes 50 to 500 nm vacuum
		 aerodynamic diameter.

UNCERTAINTY: 50% for accuracy (pending further calibration work),
	     precision is much better, perhaps 10%.  There are
	     unresolved conflicts with concentrations from the
	     impactor, so this data set should be viewed as
	     proportional to the true concentrations.

ULOD_FLAG: -7777 -7777 -7777 -7777 -7777 -7777
ULOD_VALUE: N/A
LLOD_FLAG: -8888 -8888 -8888 -8888 -8888 -8888
LLOD_VALUE: N/A
DM_CONTACT_INFO: N/A

PROJECT_INFO: Pacific Atmospheric Sulfur Experiment (PASE), 
	      4 August to 8 September 2007

STIPULATIONS_ON_USE: This is PRELIMINARY data.  
		     Do not use for publications.

OTHER_COMMENTS: N/A

REVISION: RA

Not all calibration corrections are complete: Ionization
efficiency is close, but transmission efficiency needs more work.

This release has the simplest possible collection efficiency: it is
assumed to be 0.5, which has been regarded as close to accurate except
when NH4+:SO4= ratios are low.  A subsequent release will use more
plausible assumptions.  

Exact sampling times are not known exactly; recorded times are the end
of sampling periods, but the mass spec open mode is 1 of 3 modes being
used and the time of each mode is not recorded, so actual sample times
may be a few seconds earlier than indicated.

No allowances made for sampling delay due to inlet tubing length.

Column headings:

Start_UTC	Stop_UTC	Mid_UTC	NO3	SO4	NH4	ORG