NOAA PMEL Station Chemistry Data
Contact person:  Trish Quinn, patricia.k.quinn@noaa.gov

Station ID
BND = Bondville, IL  (40.05N,88.4W)
BRW = Barrow, AK (71.3N, 156.6W)
CPO = Cheeka Peak, WA  (48.3N, 124.6W)
WSA = Sable Island, Nova Scotia  (43.9N, 60.0W)
KOS = Kosan, Cheju Island, South Korea (33.29N, 126.16E)
THD = Trinidad Head, CA (41.05N, 124.15W)
SGP = Southern Great Plains, Lamont, OK (36.6N, 97.5W)
Chebogue Point, Canada (43.74N, 66.12W)


Except for Barrow, submicron samples are collected on a daily basis and
Supermicron samples are collected on a weekly basis.
At Barrow sample periods change with season and aerosol loading.
The submicron - supermicron split is made with a Berner-type cascade
impactor having a D50,aero of 1.0 um at the RH of the sample stream.
Hence, the submicron data is for particle sizes < 1.0 um and the supermicron
data is for particle sizes > 1.0 um and < 10 um.  The RH of the sampled
aerosol is < 40% at all stations.

All samples have been analyzed by ion chromatography for Cl-, NO3-, SO4-2, Na+, NH4+, K+, Mg2+, and Ca+2.  
Recently, the analysis of MSA-, Br-, and oxalate has been added to some stations.

Samples also are analyzed for total mass by gravimetric analysis at 55 +/- 5% RH.
All ion and mass concentrations are given as ug/m3 at STP.

More details of the sampling and analysis methods can be found in 
Quinn et al., J. Geophys. Res., 105, 6785 - 6805, 2000.

There are two separate files of data for each station:  one for submicron data
and one for supermicron data.

Flags used in the files are:

V = Volume zero or unknown.  
NS = Filter not sampled. 
BDL = Below detection limit.  
NA = Data not available.  
Filters 2 through 8  = submicron filter.
Filter S = supermicron filter.

Detection limit values (ug/m3)

Mass = 0.02
Na = 0.0002
NH4 = 0.0001
K = 0.0001
Mg = 0.0001
Ca = 0.0001
MSA = 0.0001
Cl = 0.0002
Br = 0.0001
NO3 = 0.0001
SO4 = 0.0001
Oxalate = 0.0001