Documentation on NIWA CCN data

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
Organisation:    National Institute for Water and Atmospheric Research (NIWA), P.O. BOX 14-901,
                 Kilbirnie, Wellington, New Zealand.
Sponsor:         N.Z. Foundation for Research Science and Technology (FRST)
Datafile:        NIWACCN.CSV (comma separated PC ASCII file)

Data Fields:
Field	Description	Units
1	Year		Integer
2	Julian day	Integer
3	Time		HHMM Integer
4	Julian day	Real, precision 2
5	Hour		Real, precision 2
6	Chamber supersaturation	%
7	Event log	Integer
8	CCN number	per tenth cm^3
9	CCN number	per cm^3
10	Active Pixels	Integer


Data Description:
	Field 7 - event log
Events coded as
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.

MJH 7-Jun-96