Date:  04 Dec 1995
 Time Sent: 09:35 E Summer 
 Reported by: John Gras
 
 
 
 CHECK IF                      COMMENTS/
 OPERATIONAL                   CUT TIME OFF-LINE
 ------------                  -------------------
 
 
   CN, TSI 3020
 
   Static thermal gradient CCN Counter     
 
   Continuous record of CCN at 0.5%
 
   PMS ASASP-X
 
   TSI 3071
 
    Particle number size distribution using an UDMPS
 
    TDMA measurements of hygroscopic growth
 
   Light scattering & backscattering fraction, 2 nephelometers
 
   Magee Scientific Aethalometer
 
   TSI 3760 CN counter Gras
 
   Hivol, PM10
 
   Size selected filter stack
 
   SO2 Saltzman
 
    NH3 Whung, AOML
 
   DMS, automated gas chromatography
 
   Radon (222)
 
   Spectral optical depth
 
    Aerosol chemical composition using mass Spectrometry 
 
    Daily MOUDI samples
 
   Six-stage hi-vol cascade impactor Sievering
 
   Bulk filter concentrations every three hours
 
   NOx, NMHC, O3
 
   Peroxides and aldehydes
 
    Stable sulfur isotopes
 
   Single particle analysis using TEM/SEM/EDXA
 
    Single particle analysis using 
 MassSpec 
    APS

   ISS -operational
 

OTHER COMMENTS:

No changes in instrument status since the last report. Yesterdays conditions after about 1100 EST, (0100 Z) were essentially clean maritime from a particle point of view. CCN @ 0.5% were around 80 cm-3 dropping as low as 20 cm-3 for around two hours around 0800 Z. Currently CCN are around 90 cm-3 and CN around 500 cm-3. THe size distribution shows the typical maritime modes at around 30 nm and 150 nm diam. and also a weak mode around 15 nm diam. Radon is around 28 mBeq m-3. Wind direction presently is around 180-190 so conditions are just on the edge of baseline.

John