Introduction continued
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The T/P altimeter data were processed using the JGM-3 orbit.
The following corrections were applied: oscillator-drift,
electromagnetic bias, ionospheric, wet and
dry tropospheric, inverse-barometer, and tidal
(including ocean from CSR3.0 model, solid-earth, loading, and pole-tide).
Because the geoid is not known accurately enough,
we use only the anomalies in the resulting sea-surface height (SSH) data,
after subtracting the Nov 1992 --- Nov 1995 (Cycles 6--116) mean. The T/P
spatial sampling interval is about 9.9 days in time and 6.2 km along-track
in space.
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The current meters were moored mid-way between the IES's and maintained for
the same two-year period for which the URI IES's were deployed.
Each mooring had 1-4 current meters at nominal pressure levels
of 600, 1400, 2800, and 4500 dbar. The current-meter data were
low-pass filtered using the tide-elimination filter described at the
beginning of section 4.5 in Godin (1972), followed by the same 120-hour
filter that was applied to the IES data. The current meters were
equipped with both temperature and (in most instances) pressure sensors.
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The hydrographic data consisted of 889 profiles, approximately half were
from CTD's and half from XBT's, mostly taken during the two-year URI
IES deployment period. These data underwent extensive
quality-control checks. Salinity values for the XBT casts were inferred
from the average temperature--salinity relationship of the
immediately preceding and immediately following CTD cast taken at the same
location.
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