ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95120719)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 45 33.6S LONGITUDE: 145 01.1E
• LOCATION -6 HOURS: LATITUDE: 45 23.8S LONGITUDE: 145 28.7E
• LOCATION -12 HOURS: LATITUDE: 45 02.4S LONGITUDE: 143 45.3E
• LOCATION -18 HOURS: LATITUDE: 44 59.9S LONGITUDE: 141 24.9E

PRESENT WEATHER:

Winds 265 degrees at 8 m/s, pressure 1011.2 and rising, skies beginning to clear after frontal passage, dry bulb 11.5C, wet bulb 10.0C, SST 11.5

SEA STATE:

Southwesterly 2-3 M swell, wind waves from 265 at 1 M

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Current concentration 1-2nM
  2. DMSP/DMSO: Dissolved DMSPconcentrations are about 5 nM, particulate DMSP about 15 nM. Incubation from 12/03 showed 15 hour turnover time for DMSP.
  3. NH4+NH3/pH:
  4. CO: Surface seawater concentrations have a diurnal cycle with a late night minimum of 1 and and an afternoon maximum of 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 approximately 5 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: Atmospheric DMS concentrations ranged from 100-300 ppt on day 304.
  2. SO2: Current concentrations are 10 ppt at local noon.
  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 range from 17 to 20 ppb.
  7. Nitrogen oxides and PAN: NO, NO2, NOy operational. PAN not functional.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: At 17:00GMT - prefrontal zone , Ntot=250pp/cc, 2 modes - 40 and 160nm.
  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: Absorption coefficient very low.
  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 8 sondes/day through 1100 GMT (12/6) and starting again at 0200 (12/7).

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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):

  Currently proceeding to balloon launch site (45 degrees 18’ S, 145 degrees E). The first of three smart balloons will be launched two hours after the clear skies arrive at the ship. The remaining two balloons will be launched as quickly thereafter as possible. The ship will hold station for the remainder of the day for air sampling.

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• PAST 24-HR OPERATIONS SUMMARY: Discoverer headed for the start of the Lagrangian yesterday with continuous underway air and seawater sampling.
• OTHER COMMENTS: