GTS Data Distribution
TAO Refresh Moorings
TAO Refresh data are distributed on the Global Telecommunications System (GTS) under the SSVX08 KWNB header in World Meteorological Organization (WMO) FM18 – BUOY alphanumeric format. Due to the increased reporting capability provided by TAO Refresh, hourly surface messages (winds, air temperature, relative humidity, and sea surface temperature) and subsurface messages (ocean temperatures) are now available. The WMO numbers for the TAO Refresh buoys are available at the URL.
Legacy ATLAS Moorings
Legacy ATLAS data are distributed on the
GTS with the
assistance of Service Argos and the Data Buoy
Co-operation Panel. Hourly surface messages
(winds, air temperature, relative humidity,
and sea surface temperature) and daily
averaged subsurface messages (ocean
temperatures) are available in WMO code form
FM 18-X BUOY with bulletin header SSVX08
KARS. TRITON data are also transmitted via
the GTS. For more information on the TRITON
buoys, see the TRITON web pages.
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The surface messages are hourly
values, but the sampling method differs
between Standard and NextGeneration ATLAS
systems. Details may be found in the TAO
sampling page. Surface messages are generated
whenever Argos receives a satellite pass,
typically 2-4 times per day for ATLAS
moorings.
The buoys transmit from 0600-1000,
1200-1600 local times (not GMT). The buoys
transmit only 8 hours a day in order to
conserve battery power and reduce telemetry
cost. The morning and afternoon transmit
windows coincide with satellite passes.
Transmit windows for the buoys are listed
below in GMT. Across the TAO array few
observations are reported in real-time
between 0600 and 1200 GMT.
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TAO Sites |
GMT transmit times |
95W
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1200-1600z,1800-2200z
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110W
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1300-1700z,1900-2300z
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125W
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1400-1800z,2000-2400z
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140W
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1500-1900z,2100-0100z
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155W
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1600-2000z,2200-0200z
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170W
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1700-2100z,2300-0300z
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180W
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1800-2200z,0000-0400z
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165E
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1900-2300z,0100-0500z
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PIRATA Sites
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GMT transmit times
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10W
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0600-1000z,1200-1600z
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23W
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0700-1000z,1300-1700z
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35W
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0800-1200z,1400-1800z
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38W
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0800-1200z,1400-1800z
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The subsurface temperature data are
available on the GTS as daily averages with a time
stamp of 0000z at the end of the average period. Only
one subsurface message per day per buoy is
available.
As part of the data quality monitoring, NDBC
identifies and informs Service Argos of data that
should not be submitted to the GTS. In turn, Service
Argos makes available to NDBC data which are
submitted to the GTS and NDBC compares these data for
consistency checks with data processed at NDBC.
Typically, about 80% to 90% of data which are
received at NDBC make it onto the GTS. Due to a
combination of the ATLAS sampling and transmission
schedule, telemetry paths of the NOAA satellite
system, and Service Argos processing time, there is a
finite time lag between observations and availability
on the GTS. Over half of the TAO data which are
placed on the GTS are available within 3 hours or
less and over 90% are available within 7 hours.
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