CAPE GRIM STATUS REPORT

 Date:  25 Nov 1995
 Time Sent: 10:10 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
 
    Ammonium to nss sulfate molar ratio 
                                using thermal cond. ----->not included 

   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 Spec 
  
    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

Yesterday we were blessed with a large fraction of baseline conditions, , mainly W to WSW winds, CCN concentrations (for 0.5% ss) ranged from around 80 to 120 /cm3 CN concentrations varied from about 300 to 800 with UCN typically equal to CN. SO2 is currently non operational due to inlet problems. NH3 has problems with gas phase collection efficiency calibration because of a dead permeation tube.

John Ivey has given me the DMS data up to about 0Z yesterday. From 16/11 to 21/11 concnetrations were typically 0.2 - 1 nmole /m3. During 21/11 - 23/11 levels increased to around 2-4 nmole/m3 decreasing again to around 1 nmole/m3. By 0900 local on 24/Nov (328) levels again were up to around 3 nmole/m3.

Comments on yesterdays report.

We would like to see a similar vertical structure flight for Cape Grim as was proposed by Barry for Disco. Reinout has already put together a proposed flight plan for such a flight.

Layers with elevated small CN are not uncommon in the FT in this part of the world. We have seen many of these in varying thicknesses from a couple of hundred metres to over a km and with varying lateral dimensions - the longest I have encountered was at about 5 km extended well across the full width of Australia and was present over at least three days.