ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95112519)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 44 13.3S LONGITUDE: 141 56.9E
• LOCATION -6 HOURS: LATITUDE: 45 15.6S LONGITUDE: 142 53.1E
• LOCATION -12 HOURS: LATITUDE: 46 35.1S LONGITUDE: 144 06.8E
• LOCATION -18 HOURS: LATITUDE: 47 38.1S LONGITUDE: 145 07.3E

PRESENT WEATHER:

Winds 060 degrees 15 m/s, pressure 1007.5 mb and falling, partly cloudy, dry bulb 10.5C, wet bulb 9.0C seawater 10.9C.

SEA STATE:

Southeasterly 3-4 M swell/waves

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Concentrations are on average 1.4 nM.
  2. DMSP/DMSO: Samples collected every 8 hours for particulate and dissolved DMSP and MSO. Incubation experiment in progress
  3. NH4+NH3/pH: NH4+NH3 concentration 0.5 umolar. pH 8.09.
  4. CO:
  5. NMHC: Butane ~3ppb; Pentane ~0.3ppb in equilibrated air samples.
  6. CO2:
  7. Nitrate/Chlorophyll: Nitrate concentrations are approximately 12 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: average concentration yesterday = 110 ppt.
  2. SO2: Concentrations approximately 5-10 ppt.
  3. NH3: Using oxalic acid coated filters.
  4. CO:
  5. NMHC:
  6. O3: Concentrations near 18ppb (2200 local time).
  7. Nitrogen oxides and PAN: NO2 system not operational.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: Clean, Ntotal = 250 pp/cc, "closed" size distribution.
  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:
  15. TDMA-Thermal: Observed sudden increase in volatility and different degrees of external mixing last evening--returning slowly back to a 'non volatile' state ---maybe due to slow neutralization of sulfuric acid.

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• ISS Status and Schedule:

  System operational with 4 sondes/day. An extra sonde was launched at 0300 to support aircraft overflight.

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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 Southern Surveyor Station P1 at 42S, 140E. Hold station there until approximately 0000Z on 11/27 to complete 72 hour sampling period.

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• PAST 24-HR OPERATIONS SUMMARY: 1. Intercomparison with Southern Surveyor complete at 2200 on 11/24. included radiosonde, DMS (seawater and atmospheric), and seawater nitrate, ammonium + ammonia, chlorophyll, DOC. 2. Intercomparison with C-130 commenced at 0115 on 11/25.
• OTHER COMMENTS: