ACE-1 R/V DISCOVERER STATUS FORM

DATE/TIME: (95120319)

PREPARED BY: Tim Bates

• LOCATION PRESENT: LATITUDE: 45 12.1S LONGITUDE: 142 42.3E
• LOCATION -6 HOURS: LATITUDE: 46 05.3S LONGITUDE: 143 41.4E
• LOCATION -12 HOURS: LATITUDE: 47 00.5S LONGITUDE: 144 34.6E
• LOCATION -18 HOURS: LATITUDE: 47 03.5S LONGITUDE: 145 58.9E

PRESENT WEATHER:

Winds 230 degrees at 9 m/s, pressure 999.2 and rising, partly cloudly, some showers and rainbows in the area, dry bulb 9.0C, wet bulb 6.0C seawater 9.8C.

SEA STATE:

Westerly 2-3 M swell, wind waves from 230 at 1-2 M

INSTRUMENTS/SYSTEMS STATUS

---

• 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 11/27 showed 10 hour turnover time for DMSP(14 hours on the 22nd).
  3. NH4+NH3/pH:
  4. CO: Surface seawater concentrations have a diurnal cycle with a late night minimum of 0.8 and and an afternoon maximum of 1.2 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 approx 3 uM. Seawater fluorescence is being recorded continuously. Surface seawater samples are being collected every 4 hours for discrete chlorophyll analysis.

  ---

• Atmospheric Measurements:

  1. DMS: Current concentrations at 45S are approximately 80 ppt.
  2. SO2: No measurements due to winds abaft the beam.
  3. NH3: Using oxalic acid coated filters. Concentrations measured with oxalic acid coated filters range from 3 to 10 pptv.
  4. CO: Concentrations near 60ppb.
  5. NMHC: ppt levels of a few hydrocarbons. very clean air.
  6. O3: Concentrations range from 18-24 ppb.
  7. Nitrogen oxides and PAN: Not operated 9-11 LT. NO <4ppt until 4pm LT; then rising to 50 ppt. NO2: ~10 ppt before 9am LT, 35-40 after 11, rising to ~80 after 4pm LT. NOy ~300 ppt.
  8. Radon:
  9. CO2:
  10. Solar Radiation:
  11. Aerosol physics: At 0600 there was an "open" size distribution with modes at 15-20nm and 90nm modes, at 1800GMT JD337 the 10-12nm mode became very dominant with addition modes at 28 and 90nm. UFCN = 600-700 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. Concentrations (ug/m3) for recent time periods: Time subum nss SO4 subum NH4 328.998 to 330.023 (GMT) 0.15 0.036 (airplane in vicinity) 335.287 to 336.929 (GMT) 0.103 0.028 (prior to start of second Lagrangian)
  13. Aerosol optical properties: Absorption coefficient very low.
  14. TDMA-RH:
  15. TDMA-Thermal:

  ---

• ISS Status and Schedule:

  System operational with 8 sondes/day during Lagrangian period, returning to 4 sondes/day as of 0800. Surface met was down from 22:30 Dec 2 to 03:30 Dec 3.

  ---

• Routine Weather Observations: Going well.
• Satellite Observations: None
• CTD Cast Schedule: None.

  ---

• SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):

  Continue transit northwest unless a decision is made to start the next Lagrangian.

  ---

• PAST 24-HR OPERATIONS SUMMARY: After completing the Lagrangian transect at 46S, 148E , Discover headed southwest and intersected the Southern Surveyor station line at 47 18’S, 144 52’E. We are now headed northwest along that trackline toward 42S, 140E. Highest priority has been to keep the wind within 45 degrees of the bow for air sampling.
• OTHER COMMENTS: