ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95112919)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 43 14.7S LONGITUDE: 141 53.7E
• LOCATION -6 HOURS: LATITUDE: 42 28.1S LONGITUDE: 142 44.6E
• LOCATION -12 HOURS: LATITUDE: 41 18.5S LONGITUDE: 143 52.4E
• LOCATION -18 HOURS: LATITUDE: 40 48.6S LONGITUDE: 144 11.9E

PRESENT WEATHER:

Winds 300 degrees at 15 m/s, pressure 997.3 and falling, partly cloudy, dry bulb 11.5C, wet bulb 10.0C seawater 11.4C.

SEA STATE:

West southwesterly 4-5 M swell, wind waves from 300 at 2-3M

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS:
  2. DMSP/DMSO: Samples collected every 8 hours for particulate and dissolved DMSP and DMSO.
  3. NH4+NH3/pH:
  4. CO: Surface seawater concentrations have a diurnal cycle with a late night minimum of 0.8 and and an afternoon maximum of 1.2 nM.
  5. NMHC: Butane ~5ppb; Pentane ~0.4ppb in equilibrated air samples.
  6. CO2:
  7. Nitrate/Chlorophyll: Nitrate concentrations are approximately 0.2 uM. Seawater fluorescence is being recorded continuously. Surface seawater samples are being collected every 4 hours for discrete chlorophyll analysis.

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• Atmospheric Measurements:

  1. DMS:
  2. SO2: Concentrations approximately 10 ppt.
  3. NH3: Using oxalic acid coated filters. Concentrations measured with oxalic acid coated filters range from 3 to 10 pptv.
  4. CO: Concenctrations near 60ppb.
  5. NMHC: Butane ~300ppt; Pentane ~30ppt
  6. O3: Concentrations range from 20-24 ppb.
  7. Nitrogen oxides and PAN: NO up to ~40 ppt and NOy ~400 ppt (preliminary values) mid-day. NO2 not operational.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: NW air stream, "open" size distribution, modes at 18, 30 and 110nm . UFCN = 800, CN = 750 pp/cc
  12. Aerosol chemistry: 2-stage and 7-stage impactors currently sampling for time periods ranging from 24 to 72 hours for IC, total organic carbon, speciated organics, and gravimetric analysis.
  13. Aerosol optical properties:
  14. TDMA-RH:
  15. TDMA-Thermal:

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• ISS Status and Schedule:

  ISS status report for ACE-1 for today is here

  System operational with 4 sondes/day.

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• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: None.

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• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  Continue heading to Lagrangian #2 starting point. We are unable to head directly for this point due to heavy seas. Our present course (205 degrees) has the wind on the starboard bow allowing us to continue air and seawater sampling.

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• PAST 24-HR OPERATIONS SUMMARY: Sampling was conducted in the vicinity of Cape Grim although with NW winds we were sampling a continental airmass. We would like to return to the region upwind of Cape Grim when they are in baseline conditions.
• OTHER COMMENTS: