ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95120819)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 45 33.6S LONGITUDE: 144 19.5E
• LOCATION -6 HOURS: LATITUDE: 45 32.9S LONGITUDE: 144 09.0E
• LOCATION -12 HOURS: LATITUDE: 45 38.3S LONGITUDE: 144 01.1E
• LOCATION -18 HOURS: LATITUDE: 45 32.6S LONGITUDE: 144 18.1E

PRESENT WEATHER:

Winds 010 degrees at 9 m/s, pressure 1003.0 and falling, overcast with periods of drizzle, dry bulb 12.0C, wet bulb 11.0C, SST 11.6

SEA STATE:

Southwesterly 2-3 M swell, wind waves from 010 at 1 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 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 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: Initial concentrations at frontal passage of approximately 200 ppt dropped steadily through the day to 50 ppt.
  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 are in the 15 to 20 ppb range. An ozonesonde was launched between the second and third smart balloon launchs which gave an ozone profile to 34 km. Ozone mixing ratios were 17-20 ppb below 1.4km and in the high 20's and low 30's in the 2km above the boundary layer inversion.
  7. Nitrogen oxides and PAN: NO max ~2pm lt at ~10ppt; NO2 steady 10-12 ppt, NOy ~600 ppt AM but maxed at ~900ppt about 2pm. PAN not operaterational.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics:
  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:

  ISS status report for ACE-1 for today is here

  System operational with 8 sondes/day.

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• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: One cast scheduled for 2330.

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• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  Continue sampling at Lagrangian start point until air mass changes to continental. Discoverer will then follow the smart balloon track to measure surface seawater DMS and NH3 concentrations.

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• PAST 24-HR OPERATIONS SUMMARY: Discoverer passed in and out of the front several times as we were guided to the smart balloon launch point. Three balloons were successfully launched to mark the third and final Lagrangian air mass. Air and surface seawater sampling continued at the final launch location for the remainder of the day.
• OTHER COMMENTS: