Transcript GLOSS Group of Experts

GLOSS
Global Sea Level Observing
System
Bernie Kilonsky
University of Hawaii
(GLOSS Group of Experts)
Thorkild Aarup
Intergovernmental Oceanographic Commission
(GLOSS Technical Secretary, [email protected])
Mark Merrifield
University of Hawaii
(Chair GLOSS Group of Experts)
How Are GLOSS Tide Gauges Used?
• Altimeters need to be calibrated using gauges
• Continuity and low cost. The altimeter record
may have gaps in future and we need the GLOSS
network for global variability information
• Long mean sea level (MSL) records needed for
climate change studies (e.g. for IPCC)
• Long records of higher frequency climate
change (e.g. changes in storm surge statistics)
• Many coastal applications. People live at the
coast and not in the deep ocean.
Acoustic Gauge in
Australia
• Higher frequency sampling important for storm
and tsunami monitoring and warning.
Many GLOSS sites report real-time high
frequency
sea level information on an hourly
transmission
cycle to the Pacific Tsunami Warning Center.
INDIAN OCEAN TIDE GAUGES FOR TSUNAMI WARNING
STATUS, JANUARY 2005
12 GLOSS UHSLC Stations - operating, 2-4 minute sample period, 1 hour transmission
4 GLOSS UHSLC Stations - operating, 4-6 minute sample period, no satellite transmission
1 GLOSS Australian Station - operating, 6 minute sample period, satellite transmission
3 GLOSS Australian Stations - 1 hour sample period, 1 week - 1 month delivery
4 GLOSS Stations - operating, 1 hour sample period, 1 week - 1 month delivery
Ko Lak, Ko Taphao Noi, Richard's Bay, Tanjong Pagar
GLOSS Stations - Proposed installations, 1 minute sample, 15 minute transmission
Minicoy, Madras, Vishakhapatnam (SOI-UHSLC), Padang, Cilacap (Bakosurtanal-UHSLC)
What does GLOSS offer?
•
•
•
•
•
Global data archiving facility with QC of data
Training courses on analysis & uses of sea level obs.
Technical expert visits
Technical manuals and training material
Special workshops on technical issues (i.e. How to
operate a gauge in harsh ocean environments; New
technical developments in sea and land level
observations)
• Provision of gauges
• Assistance with development of proposals for
upgrade tide gauge hardware
Given
•Many GLOSS sites are already using geostationary
satellites and the WMO’s GTS to provide data for
tsunami monitoring and warning to PTWC.
•The added sustainability and importance of an ocean
observing system tailored to meet the needs of all (i.e.,
multiple use stations).
•The existing infrastructure and expertise in the
collection of in situ sea level information available
through GLOSS in terms of field operations, training
programs, and data centers.
•The value of GLOSS tide gauges as demonstrated during
the Indian Ocean and other tsunamis,
It is highly recommended that
Full advantage is taken of the GLOSS program when
developing a global tsunami warning system. In
particular, the expansion and upgrade for tsunami
warning of the GLOSS Core Network of tide gauges
should be a high priority for the international community.