Stratus Ocean Reference Station

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Stratus Ocean Reference Station

• Established Oct 2000, 20S, 85W
• Annual recover/redeploy
• Surface met/fluxes
• at 1 minute, 2 systems
• Withheld, hourly shared via ftp
• Ocean velocity, temp, salinity to 300 m
• 6 to 10 days on site at mooring
• Additional station time at 20S, 75W at SHOA
  site

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Stratus surface mooring Cruises have originated
from Arica, Galapagos, Costa Rica, Ecuador Cruise
have returned to Arica, Valaparaiso
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Diurnal variability at stratus mooring Red -
incoming lw Blue - incoming sw Black -
sst Magenta - air temp Cyan - wind speed
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Summary of 3 years (overplot) of monthly heat
flux terms and of air temperature and sea surface
temperature
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(different sign convention)
NCEP
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Three years of temperature data
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The interannual anomalies are associated with
depth of permanent thermocline and of new annual
thermocline. The base of the thermoclines stands
out as having the largest departures from the
3-year mean.
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1-D PWP ocean model run Heat does not penetrate
as deeply as observed
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Progressive vector diagrams of ocean
currents Evidence for surface wind-driven flow
and for eddy variability
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Ekman heat flux (numbers and color contours) is a
small contribution to local heat balance.
Climatological SST isolines are close to parallel
to wind stress in offshore region.
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Mesoscale variability associated with Rossby waves
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Vega, Du Penhoat, Dewitte, Pizarro, Abarca
AVION Newsletter Low Frequency Variability in
Southeastern Pacific Rossby waves
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Eddy transport of heat Correlation of eddy u and
T and of eddy v and T at 10 m (blue), 20 m (red),
and 128 m (black)
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Best estimates of heat balance at stratus
mooring. Major terms surface heating, Ekman
pumping, geostrophic advection, eddy divergence.
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SHOA DART Surface Mooring at 75W, 20S
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INOCAR surface moorings Calicuchima