NOAA PMEL Station Chemistry Data
Contact person:  Trish Quinn, quinn@pmel.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)

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.

Samples are analyzed by ion chromatography for Cl-, NO3-, SO4-2, Na+, NH4+, 
K+, Mg2+, and Ca+2.  Barrow samples also are analyzed for MSA-.

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.