Title: Macquarie Island CCN data (NIWA)

Contact:

   Mike Harvey
   National Institute for Water and Atmospheric Research (NIWA)
   P.O. Box 14-901, Kilbirnie
   Wellington, New Zealand
   Telephone: (64) 4 386 0300
   Facsimile: (64) 4 386 2153
   E-Mail Address: m.harvey@niwa.cri.nz


Data Set Description:

Event:           ACE-1 intensive
Record date:     20-Nov-1995 to 3-Jan-1996
Instrument:      DH Associates Model M1 CCN monitor modified by NIWA for
                 supersaturation control
Site:            Macquarie Island Clean Air Laboratory
Operator:        Georgina Sturrock
Contact Person:  Mike Harvey - m.harvey@niwa.cri.nz
Organization:    National Institute for Water and Atmospheric Research (NIWA)
Sponsor:         N.Z. Foundation for Research Science and Technology (FRST)


Format: comma-delimited ASCII.

Data Fields:
Field   Description      Units
1       Date             YYYY/MM/DD (UTC)
2       Time             HH:MM:SS (UTC)
3       Year             Integer (UTC)
4       Julian day       Integer (UTC)
5       Time             HHMM Integer (UTC)
6       Julian day       Real, precision 2
7       Hour             Real, precision 2
8       Chamber supersaturation       %
9       Event log        Integer
10      CCN number       per tenth cm^3
11      CCN number       per cm^3
12      Active Pixels    Integer

Field 9 - event log code
code    meaning
0       no event
1       supersaturation spectra run
2       chamber thermocouple problems
3       some data missing in full record
        (for full record (additional fields) contact m.harvey)
4       calibration run
5       polluted air
6       error value on serial interface > 100 (diagnostic value only)

Events recorded with lowest non-zero value taking precedence.

Field 10 - Active pixels
Number of pixels available to CCD camera for recording CCN. Max = 1024.
A small number usually indicates that the field of view is blocked by a
water drop hanging from the chamber roof.


File Name Conventions:
   niwaccn.dat

References:  None.