ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95120119)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 44 53.2S LONGITUDE: 140 47.3E
• LOCATION -6 HOURS: LATITUDE: 44 57.7S LONGITUDE: 140 57.6E
• LOCATION -12 HOURS: LATITUDE: 45 12.1S LONGITUDE: 141 15.9E
• LOCATION -18 HOURS: LATITUDE: 45 21.0S LONGITUDE: 142 23.4E

PRESENT WEATHER:

Winds 285 degrees at 8 m/s, pressure 1006.7 and rising, partly cloudy, dry bulb 10.2C, wet bulb 8.0C seawater 10.2C.

SEA STATE:

Westerly 2-3 M swell, wind waves from 290 at 1 M

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Current concentration 1.3nM
  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 ~2ppb; Pentane ~0.4ppb in equilibrated air samples.
  6. CO2:
  7. Nitrate/Chlorophyll: Nitrate concentrations are approx 6.4 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: Concentrations have increased from approximately 5 to 10 ppt.
  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<4 ppt and NOy ~300 ppt. NO2 not operational.
  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:

  ISS status report for ACE-1 for today is here

  System operational with 4 sondes/day. Extra sondes were launched at 0800 1400, and 2000 to support Lagrangian #2.

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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):

  At 2100 the ship will turn downwind and sample seawater along the Lagrangian path for DMS and NH3 concentrations. Every 4 hours the ship will turn bow to wind for 30 minutes of air sampling.

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• PAST 24-HR OPERATIONS SUMMARY: The primary objective yesterday was to keep the wind within 45 degrees of the bow for clean SO2 sampling. In addition we tried to steam southward to cross the oceanic front at approximately 46S. Due to wind conditions we were unable to accomplish the second objective. At 0900 the ship held station (45S, 141E) to prepare for the second Lagrangian. Extra sondes were launched and a smart balloon (#10) was launched at 1245. A second smart balloon launch at 1400 (#4) was unsuccessful. The ship held station after the balloon launches for air and surface seawater sampling. There was no indication of ultra-fine partilces mixing into the boundary layer after frontal passage.
• OTHER COMMENTS: