ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95120219)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 46 20.1S LONGITUDE: 147 24.6E
• LOCATION -6 HOURS: LATITUDE: 45 50.9S LONGITUDE: 146 31.6E
• LOCATION -12 HOURS: LATITUDE: 45 29.2S LONGITUDE: 144 14.9E
• LOCATION -18 HOURS: LATITUDE: 45 11.3S LONGITUDE: 141 53.2E

PRESENT WEATHER:

Winds 320 degrees at 15 m/s, pressure 998.2 and starting to rise as the front is now passing us, overcast, light rain, dry bulb 11.5C, wet bulb 10.0C seawater 10.6C.

SEA STATE:

Westerly 2-3 M swell, wind waves from 320 at 1-2 M

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Current concentration 1.3nM
  2. DMSP/DMSO: Dissolved DMSPconcentrations are about 5 nM, particulate DMSP about 15 nM. Incubation from 11/27 showed 10 hour turnover time for DMSP(14 hours on the 22nd).
  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: Low ppb levels of butane. sub ppb levels of pentane in equilibrated air samples.
  6. CO2:
  7. Nitrate/Chlorophyll: Nitrate concentrations are approx 3 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: Current concentrations at 45S are approximately 80 ppt.
  2. SO2: No measurements due to winds abaft the beam.
  3. NH3: Using oxalic acid coated filters. Concentrations measured with oxalic acid coated filters range from 3 to 10 pptv.
  4. CO: Concentrations near 60ppb.
  5. NMHC: Butane ~8ppt; Pentane ~1ppt
  6. O3: Concentrations range from 18-24 ppb.
  7. Nitrogen oxides and PAN: No measurements due to winds abaft the beam. NO2 operational again.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: Aerosol physics: Sizing instrumentation fully operational.
  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:

  System operational with 8 sondes/day during Lagrangian period.

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• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: One cast scheduled for 2230.

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• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  At 1700 this morning Discoverer reached the end of her Lagrangian transect at 46S, 148E and turned to a southwesterly heading. Today’s goal will be to work westward and keep the wind within 45 degrees of the bow for air sampling. Our destination will depend on the start time of the next Lagrangian. We would prefer to start with the frontal system moving past 45S, 140E Monday evening (LT). This would allow us to spend the final days of the project further north and upwind of Cape Grim.

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• PAST 24-HR OPERATIONS SUMMARY: Transit downwind along the balloon trajectory. Seawater sampling was continuout, air sampling was sporadic due to wind direction.
• OTHER COMMENTS: