Winds 265 degrees at 8 m/s, pressure 1011.2 and rising, skies
beginning to clear after frontal passage,
dry bulb 11.5C, wet bulb 10.0C, SST 11.5
SEA STATE:
Southwesterly 2-3 M swell, wind waves from 265 at 1 M
INSTRUMENTS/SYSTEMS STATUS
Sea Surface Measurements:
DMS: Current concentration 1-2nM
DMSP/DMSO: Dissolved
DMSPconcentrations are about 5 nM, particulate DMSP about 15 nM.
Incubation from 12/03 showed 15 hour turnover time for DMSP.
NH4+NH3/pH:
CO:
Surface seawater concentrations have a diurnal cycle with a late night
minimum of 1 and and an afternoon maximum of 2 nM.
NMHC:
Low ppb levels of butane. sub ppb levels of pentane in equilibrated air
samples.
CO2:
Nitrate/Chlorophyll:
Nitrate concentrations are approximately 5 uM.
Seawater fluorescence is being recorded continuously.
Surface seawater samples are being collected every 4 hours
for discrete chlorophyll analysis.
Atmospheric Measurements:
DMS:
Atmospheric DMS concentrations ranged from 100-300 ppt
on day 304.
SO2:
Current concentrations are 10 ppt at local noon.
NH3:
Using oxalic acid coated filters.
CO:
Concentrations near 60ppb.
NMHC:
ppt levels of a few hydrocarbons. very clean air.
O3:
Surface concentrations range from 17 to 20 ppb.
Nitrogen oxides and PAN:
NO, NO2, NOy operational. PAN not functional.
Radon:
CO2:
Solar Radiation:
Aerosol physics:
At 17:00GMT - prefrontal zone , Ntot=250pp/cc, 2 modes - 40 and 160nm.
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.
Aerosol optical properties: Absorption
coefficient very low.
System operational with 8 sondes/day through 1100 GMT (12/6) and
starting again at 0200 (12/7).
Routine Weather Observations: Going well.
Satellite Observations: None
CTD Cast Schedule: None.
SPECIAL PLANNED OBSERVATIONS (NEXT 24-HOURS):
Currently proceeding to balloon launch site (45 degrees 18’ S, 145 degrees
E). The first of three smart balloons will be launched two hours after the
clear skies arrive at the ship. The remaining two balloons will be launched
as quickly thereafter as possible. The ship will hold station for the
remainder of the day for air sampling.
PAST 24-HR OPERATIONS SUMMARY:
Discoverer headed for the start of the Lagrangian yesterday with continuous
underway air and seawater sampling.