ATLAS/TOPEX POSEIDON MOORINGS - INVERTED ECHO SOUNDER DATA (2S, 156E)

M. Bushnell (NOAA/AOML, USA)

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Announced availability: 1 May 1994

Data Access

The Inverted Echo Sounder Data (IES) are available upon request from NOAA's
National Oceanographic Data Center (NODC) in Silver Spring, MD
(http://www.nodc.noaa.gov). The data are also archived at the National Center
for Atmospheric Research (NCAR) in Boulder, CO (http://www.scd.ucar.edu/dss/pub/toga-coare.html).

Richard Chinman at UCAR (chinman@ucar.edu) can provide additional TOGA COARE
data management information if you have further questions or problems locating
a dataset.

Background

During the verification phase of the TOPEX/POSEIDON radar altimeter mission a
rigorous open-ocean validation experiment was conducted in the western
equatorial Pacific ocean. From August/September 1992 to February/March 1993,
two TOGA-TAO moorings at 2S 156E (1739m depth) and 2S, 164.4E (4400 m depth)
were enhanced with additional temperature, conductivity and pressure sensors to
measure precisely the dynamic height from the surface to the bottom at 5 min
intervals directly beneath two TOPEX/POSEIDON crossovers.

Enhanced instrumentation on the Atlas mooring at 2S 156E included 16 Seacats
(SB-16, two with pressure sensors), 5 MTRs, and 1 Aanderaa recorder (pressure
and temperature). At 2S 164.4E, 11 Seacats (two with pressure sensors), 12
MTRs, and 2 Aanderaa recorders were added.

Enhanced bottom measurements were made within one mile of each Atlas. O ne
Bottom Pressure Recorder (BPR) and two IES were located near 2S 156E and one
BPR and one IES near 2S 164.4E.

The data contained in this file are from one IES located near the ATLAS mooring
at TOPEX-POSEIDON orbit cross-over point 2S, 156E.

Data File Information

Number of data files: 1 (ies.dat)
Dataset format: ASCII
Dataset volume: 60 KB

File Header

The file IES.DAT contains two columns:
* time - elapsed hours since 0000Z JD 251 1993
* TT - round-trip travel time (TT) in seconds. The listed TT is the third
shortest TT in the 32 ping burst. A clock drift has been applied and the series
is interpolated at 2-hour intervals.

Data Example

   132.0000       2.366055
   134.0000       2.367368
   136.0000       2.368442
   138.0000       2.368610
   140.0000       2.368038
   142.0000       2.366984

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For more information, please contact:

Mark Bushnell
NOAA/AOML 4301
Rickenbacker Causeway
Miami, FL 33149
USA

email: bushnell@ocean.aoml.erl.gov
Phone: (305) 361-4353

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Reference

Gourdeau, L., J. Picaut, M.J. Langlade, A. Busalacchi, E. Hackert, M. McPhaden,
P. Freitag, F. Gonzalez, M. Eble, R. Weller, 1995: Traitements des donnees pour
la validation en plein ocean du niveau de la mer de POPEX/POSEIDON dans le
Pacifique equatorial ouest. Notes Techniques, Sciences de la Mer, Oceanographie
Physique, No 12, ORSTOM, Centre de Noumea, 43 pp.

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Comments and updates to coare@cdiu.cms.udel.edu
Last modified: Tues 23 Jan 1996

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