ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95120919)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 49 06.5S LONGITUDE: 147 9.1E
• LOCATION -6 HOURS: LATITUDE: 47 59.8S LONGITUDE: 146 6.6E
• LOCATION -12 HOURS: LATITUDE: 46 26.7S LONGITUDE: 145 6.0E
• LOCATION -18 HOURS: LATITUDE: 45 33.8S LONGITUDE: 144 1.8E

PRESENT WEATHER:

Winds315 degrees at 16 m/s, pressure 982.0 and falling, partly cloudy, dry bulb 10.0C, wet bulb 8.0C, SST 8.3

SEA STATE:

Northwesterly 6-7 M swell, wind waves from 310 at 4-5 M

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Average seawater DMS concentration at Lagrangian 3 start = 1.8 nM.
  2. DMSP/DMSO:
  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: 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: . In the clear skies following the frontal passage at the start of Lagrangian 3 the atmospheric DMS concentrations in the MBL varied diurnally from 50-250 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 were in the 15 to 20 ppb range, until the strong northerly winds at noon when concentrations shot up to 35-40 ppb.
  7. Nitrogen oxides and PAN:
  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:

  System operational with 8 sondes/day.

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• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: CTD package lost during yesterday's cast

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• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  Hold on for dear life as we start the slow slog north into the monster seas. Surface seawater and atmospheric sampling will continue. Often they are one in the same.

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• PAST 24-HR OPERATIONS SUMMARY: At 0100 Discoverer left the Lagrangian start position and headed south south east to follow the balloon track. The main emphasis of this trip south was to make surface seawater DMS and NH3 measurements. At 1935 we turned to head back north.
• OTHER COMMENTS: