Title: Discoverer Impactor (7-stage) Data

Contact:

   Patricia Quinn
   OCRD
   NOAA/Pacific Marine Environmental Laboratory
   7600 Sand Point Way NE
   Seattle, WA, USA, 98115
   Telephone: (206) 526-6892
   Facsimile: (206) 526-6744
   E-Mail Address: quinn@pmel.noaa.gov


Data Set Description:

"ACE 1, Leg 2, PMEL 7-stage impactor data collected onboard the Discoverer."

Format: comma-delimited ASCII, one file per parameter:
br, ca, cl, k, mg, msa, na, nh4, no3, so4_tot (total SO4),
so4_sea (seasalt SO4), so4_nss (non seasalt SO4)

1, Start Date (YYYY/MM/DD) (UTC)
2, Start Time (HH:MM:SS) (UTC)
3, Stop Date (YYYY/MM/DD) (UTC)
4, Stop Time (HH:MM:SS) (UTC)
5, sample number
6, Start time, UTC - Julian Decimal Date
7, Stop time, UTC - Julian Decimal Date
8, start latitude
9, stop latitude
10, start longitude
11, stop longitude
12, average RH of the sampled air stream
13, standard deviation of the RH of the sampled air stream
14, volume of sample, m3 of air
15, ion concentration in ng/m3 for Dp,1
16, ion concentration in ng/m3 for Dp,2
17, ion concentration in ng/m3 for Dp,3
18, ion concentration in ng/m3 for Dp,4
19, ion concentration in ng/m3 for Dp,5
20, ion concentration in ng/m3 for Dp,6
21, ion concentration in ng/m3 for Dp,7

Aerodynamic mean diameter (um) and dlogDp for each stage:
These diameters are reported at the relative humidity of the
sampled air stream.

stage  "mean D,aero"  dlogDp
1      0.149          0.54
2      0.322          0.131
3      0.49           0.233
4      0.89           0.281
5      1.69           0.278
6      3.3            0.309
7      7.4            0.395

Codes used in the file:

"M_Na_BB, Na concentration is below the blank value
          (< 210 ng / sample volume (m3))."

"M_NH4_BB, NH4 concentration is below the blank value
           (< 20 ng / sample volume (m3))."

"M_K_BB, K concentration is below the blank value
         (< 43 ng / sample volume (m3))."

"M_Mg_BB, Mg concentration is below the blank value
          (< 41 ng / sample volume (m3))."

"M_Ca_BB, Ca concentration is below the blank value
          (< 970 ng / sample volume (m3))."

"M_Cl_BB, Cl concentration is below the blank value
          (< 450 ng / sample volume (m3))."

"M_Br_BB, Br concentration is below the detection limit
          (< 8 ng / sample volume (m3))."

"M_NO3_BB, NO3 concentration is below the blank value
          (< 11 ng / sample volume (m3))."

"M_SO4_BB, SO4 concentration is below the blank value
           (< 140 ng / sample volume (m3))."

"T_Na_BB, Na concentration is below the blank value
          (< 350 ng / sample volume (m3))."

"T_NH4_BB, NH4 concentration is below the blank value
           (< 19 ng / sample volume (m3))."

"T_K_BB, K concentration is below the blank value
         (< 105 ng / sample volume (m3))."

"T_Mg_BB, Mg concentration is below the blank value
          (< 88 ng / sample volume (m3))."

"T_Ca_BB, Ca concentration is below the blank value
          (< 2700 ng / sample volume (m3))."

"T_Cl_BB, Cl concentration is below the blank value
          (< 580 ng / sample volume (m3))."

"T_Br_BB, Br concentration is below the detection limit
          (< 30 ng / sample volume (m3))."

"T_NO3_BB, NO3 concentration is below the blank value
           (< 88 ng / sample volume (m3))."

"T_SO4_BB, SO4 concentration is below the blank value
           (< 190 ng / sample volume (m3))."


File Name Conventions:
 PPPPPPP.dat where PPPPPPP is the parameter:
   br, ca, cl, k, mg, msa, na, nh4, no3, so4_tot (total SO4),
   so4_sea (seasalt SO4), so4_nss (non seasalt SO4)


References: None.