ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95112619)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 41 59.7S LONGITUDE: 139 59.8E
• LOCATION -6 HOURS: LATITUDE: 41 59.6S LONGITUDE: 140 02.7E
• LOCATION -12 HOURS: LATITUDE: 42 04.2S LONGITUDE: 140 59.6E
• LOCATION -18 HOURS: LATITUDE: 43 08.6S LONGITUDE: 140 59.6E

PRESENT WEATHER:

Winds 290 degrees at 15 m/s, pressure 995.3 and rising, partly cloudy, dry bulb 12.5C, wet bulb 10.0C seawater 12.2C. A front passed the ship at 1600. Showers persisted for about 1.5 hours. The skies are now clearing.

SEA STATE:

Northwesterly 3-4 M swell/waves

INSTRUMENTS/SYSTEMS STATUS

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• Sea Surface Measurements:

  1. DMS: Concentrations are rising. We measured 2.8 nM DMS at station P1 (42N, 140E), nothering earth schattering but at least it is not the winter low values.
  2. DMSP/DMSO: Samples collected every 8 hours for particulate and dissolved DMSP and DMSO. Dissolved DMSPconcentrations are about 5 nM, particulate DMSP about 15 nM. Incubation from 11/22 showed 14 hour turnover time for DMSP. Another incubation experiment is in progress
  3. NH4+NH3/pH: NH4+NH3 concentration 0.5 umolar. pH 8.09.
  4. CO: Concentrations range from 1 - 1.5 nM.
  5. NMHC: Butane ~2ppb; Pentane ~0.3ppb in equilibrated air samples.
  6. CO2:
  7. Nitrate/Chlorophyll: Nitrate concentrations are approximately 1 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:
  2. SO2: Concentrations increased from ~5 to ~200 ppt at ~1200 then dropped back down to ~30ppt. Concentrations approximately 5-10 ppt.
  3. NH3: Using oxalic acid coated filters. Concentrations measured with oxalic acid coated filters range from 3 to 10 pptv.
  4. CO: Concenctrations near 60ppb.
  5. NMHC: Butane ~100ppt; Pentane ~10ppt
  6. O3: Concentrations are approx 25 ppb.
  7. Nitrogen oxides and PAN: NO2 system not operational.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: NW air stream, "marine" size distribution, modes at 25 and 100nm . UFCN = 500, CN = 450 pp/cc
  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:

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• ISS Status and Schedule:

  System operational with 4 sondes/day.

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• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: Cast scheduled at station P1 at 2200.

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• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  Transit eastward towards Cape Grim. Hold station (GC1) 20 nm from Cape. We would like to stay here several days for air sampling.

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• PAST 24-HR OPERATIONS SUMMARY: Conducted surface seawater and air sampling along Southern Surveyor cruise track to the west of Tasmania.
• OTHER COMMENTS: