ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95111719)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 54 13.3S LONGITUDE: 159 12.3E
• LOCATION -6 HOURS: LATITUDE: 53 40.5S LONGITUDE: 158 10.9E
• LOCATION -12 HOURS: LATITUDE: 52 48.7S LONGITUDE: 156 24.2E
• LOCATION -18 HOURS: LATITUDE: 51 42.8S LONGITUDE: 155 25.6E

PRESENT WEATHER:

Winds 230 degrees 7 m/s, pressure 998.0 mb, overcast, 1.5C, seawater 4.0C, occasional snow or sleet.

SEA STATE:

Westsouthwest 2-3 M swell/waves

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Instrumentation fully operational. Concentrations are approximately 1 nM.
  2. DMSP/DMSO: Samples collected every 8 hours for particulate and dissolved DMSP and DMSO. Analysis of DMSP to be done every three days. DMSO samples will be taken back to the US for analysis.
  3. NH4+NH3/pH: Both seawater pH and NH4+NH3 are under the weather.
  4. CO: Seawater CO is not operational
  5. NMHC: Equilibrated Seawater/GC-FID system fully operational. Butane ~6 ppb; Pentane ~0.4 ppb at 22h GMT.
  6. CO2: Instrumentation fully operational.
  7. Nitrate/Chlorophyll: Nitrate concentrations are approximately 13 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: Instrumentation fully operational. Concentrations are around 100ppt.
  2. SO2: Instrumentation fully operational. Concentrations are 5-10ppt.
  3. NH3: System not yet operational.
  4. CO: Atmospheric CO measurements fully operational
  5. NMHC: GC/FID system fully operational. Butane ~200ppt; Pentane ~20ppt (22h GMT).
  6. O3: Atmospheric O3 fully operational.
  7. Nitrogen oxides and PAN: no report.
  8. Radon: Instrumentation fully operational.
  9. CO2: Instrumentation fully operational.
  10. Solar Radiation: Solar irradiance spectroradiometer (300-850 nm, 8nm slit width) fully operational.
  11. Aerosol physics: Sizing instrumentation fully operational. Dominant nuclei mode with maximum at 12-15 nm.
  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: Instrumentation (nephelometer and PSAP) fully operational. Absorption coefficient low.
  14. TDMA-RH: Fully operational, running at the following dry sizes: 35nm, 50nm, 75nm, and 165nm. Humidities 50% and 90%. Measurements show no less-hygroscopic peak and the more-hygroscopic peak has an average growth of 1.70. The growth is slightly dry size dependent.
  15. TDMA-Thermal: System up. selecting normally 35, 50 and 150 nm to be heated at 25, 110, 130, & 150deg. C. Added additional 15 nm size due to some nice ultrafine production which became stronger throughout the day.

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• ISS Status and Schedule:

  The profiling radar, rass, and surface met station are all operating well and taking data. The sounding system is currently experiencing problems acquiring Omega Nav lock depending on the time of day and the position of Discoverer, resulting in no position and wind data and therefore no tracking abilities for the balloon. When no Nav lock is acquired, the balloon can not be launched. So far only the Nov 16 23:00 GMT flight has not been launched.

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• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: One cast is scheduled off Macquarie Island at 0700 11/18 GMT.

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• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  1. Transfer personnel and equipment to Macquarie Island (2100-0500).
  2. Radio check with Hobart and aircraft at 0000 and 0300 on freq 5562 and then 5 minutes later 13267.
  3. DMS sampling upwind of the island for measurement intercomparison with Hilton Swan on Macquarie Island (0530-0830).
  4. 150m cast for DOC/DON/DOS sampling (0630).
  5. Ozonesonde (0830).

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• PAST 24-HR OPERATIONS SUMMARY:
• OTHER COMMENTS: Planned course after leaving Macquarie Island is due west along 54 30 S. If NOAA is shut down, ship may be required to return to Hobart.