ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95121019)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 45 48.5S LONGITUDE: 145 9.0E
• LOCATION -6 HOURS: LATITUDE: 46 43.1S LONGITUDE: 146 5.4E
• LOCATION -12 HOURS: LATITUDE: 47 36.6S LONGITUDE: 147 0.2E
• LOCATION -18 HOURS: LATITUDE: 48 28.4S LONGITUDE: 147 1.4E

PRESENT WEATHER:

Winds 240 degrees at 13 m/s, pressure 996.5 and rising, partly cloudy periodic rain squalls, dry bulb 8.0C, wet bulb 5.5C, SST 11.2

SEA STATE:

Westnorthwesterly 2-3 M swell, wind waves from 240 at 2-3 M

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Average seawater DMS concentration approximately 2nM.
  2. DMSP/DMSO: Incubation from 12/06 showed a 6 hour turnover time for DMSP.
  3. NH4+NH3/pH:
  4. CO: Surface seawater concentrations have a diurnal cycle with a late night minimum of 0.5 and an afternoon maximum of 1.5 nM.
  5. NMHC: Low ppb levels of butane. sub ppb levels of pentane in equilibrated air samples.
  6. CO2:
  7. Nitrate/Chlorophyll: 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 range from 10 to 30 ppt.
  3. NH3: Using oxalic acid coated filters.
  4. CO: Concentrations near 60ppb.
  5. NMHC: ppt levels of a few hydrocarbons. very clean air.
  6. O3: Surface concentrations back in to the 17 to 23 ppb range.
  7. Nitrogen oxides and PAN:
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: 2 postfrontal events: at 01:00 2 major modes - 20 and 80 nm (20nm shifted to 23nm at 6:00). Ntot=900; at 20:00 - 3 modes 10, 23 and 90 nm. Ntot=1500pp/cc. Clean, low soot.
  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: During the last few days we have observed several occasions with low growth factors ~1.4, as we move into high pressure regions.
  15. TDMA-Thermal:

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• ISS Status and Schedule:

  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 transit to 45S, 145E. Expected arrival time 0000Z. The ship will depart this station tomorrow at approximately 0600Z to head for Hobart. Surface seawater and atmospheric sampling continue. An ozonesonde will also be launched today.

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• PAST 24-HR OPERATIONS SUMMARY: Transit north with surface seawater and atmospheric sampling enroute.
• OTHER COMMENTS: