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The Accidental Tide Gauge: A GPS Reflection Case Study from Kachemak Bay, AlaskaFor the last decade, it has been known that reflected GPS signals observed with specialized instruments could be used to measure sea level. In this letter, data from an existing geodeticquality GPS site near Kachemak Bay, Alaska, are analyzed for a one-year time period. Daily sea-level variations are more than 7 m. Tidal coefficients have been estimated and compared with coefficients estimated from records from a traditional tide gauge at Seldovia Harbor, approximately 30 km away. The GPS and Seldovia estimates of M(sub 2) and S(sub 2) coefficients agree to better than 2%; much of this residual can be attributed to true differences in the tide over 30 km as it propagates up Kachemak Bay. For daily mean sea levels the agreement is 2.3 cm. Because a standard geodetic GPS receiver/antenna is used, this GPS instrument can measure long-term sea-level changes in a stable terrestrial reference frame.
Document ID
20140013285
Document Type
Reprint (Version printed in journal)
Authors
Larson, Kristine M. (Colorado Univ. Boulder, CO, United States)
Ray, Richard D. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Nievinski, Felipe G.. (Colorado Univ. Boulder, CO, United States)
Freymueller, Jeffrey T. (Alaska Univ. Fairbanks, AK, United States)
Date Acquired
November 3, 2014
Publication Date
February 5, 2013
Publication Information
Publication: IEEE Geoscience and Remote Sensing Letters
Volume: 10
Issue: 5
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN6268
Funding Number(s)
CONTRACT_GRANT: NSF AGS-0935725
CONTRACT_GRANT: NSF EAR-0948957
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
GPS reflections
Sea level
Tide gauge

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