Sea-Level Rise for the Coasts of California, Oregon, and Washington Past, Present, and Future (2012) / Chapter Skim
Currently Skimming:
Appendix A: Vertical Land Motion and Sea-Level Data Along the West Coast of the United States
Appendix A: Vertical Land Motion and Sea-Level Data Along the West Coast of the United States
Pages 153-162
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 153... ...
1990s, although significantly more stations have been using white noise plus flicker noise covariances provides installed since 2003 as part of the National Science realistic uncertainty estimates. Foundation's Plate Boundary Observatory.1 Continu- A vertical land motion value was assigned to each ous GPS solutions allow vertical land motions to be tide gage site by taking the closest CGPS station with a estimated from shorter temporal records and with more velocity estimate within 15 km from the tide gage.
|
From page 154... ...
154 APPENDIX A -128° -124° -120° -116° Friday Harbor Neah Bay SC02 NEAH 48° Seattle SEAT Astoria TPW2 44° Crescent City PTSG 40° San Francisco TIBB P224 Alameda 36° Port San Luis P524 Santa Monica WRHS Los Angeles VTIS La Jolla SIO3 San Diego P475 32° FIGURE A.1 Map showing names and locations of the 12 tide gages and CGPS stations analyzed in this report.
|
From page 155... ...
et al., 2004) and is taken to be the vertical land motion Positive values of vertical land motion mean that the error associated with the nearest CGPS station to the land is rising.
|
From page 156... ...
ITRF2005 was developed land motion correction to the tide gages are given in from a combination of space geodetic observations Table A.2. from four independent platforms: GPS, Very Long Baseline Interferometry, Satellite Laser Ranging, and ANALYSIS OF SEA-LEVEL TREND FROM Doppler Orbit Determination and Radio-Positioning TIDE GAGES Integrated on Satellite.
|
From page 157... ...
The wide range in sea-level trends depending on the starting time and the length of the record also shows the difficulty of describing a complex time-varying signal with a simple linear relationship. FIGURE Sea-level trends for the San Francisco tide gage data as a function of data length.
|
From page 158... ...
The tide gage records were corrected for local site Adjustments to the Original Tide Gage Trends motion using GPS data (see "Vertical Land Motion from Continuous GPS" above)
|
From page 159... ...
vertical land motions over the past one or two decades are not representative of the ground motion over the Uncertainty in Adjusted Sea-Level Trends lifetime of the tide gage. To suppress the influence of possible outliers, the The 95 percent confidence limits in the sea-level slopes were plotted as a function of latitude then fit with trends were calculated using measures of uncertainty robust or weighted lines of regression (solid red line in for the original records and the GPS adjustments.
|
From page 160... ...
Boucher, 2007, ITRF2005: A new release of the International Terrestrial adjusted trends requires not only a measure of uncer- Reference Frame based on time series of station positions and tainty associated with the tide gage records but also a Earth orientation parameters, Journal of Geophysical Research, measure of uncertainty associated with the GPS data, 112, B09401, doi:10.1029/2007JB004949. in this case, the standard deviations.
|
From page 161... ...
Dragert, 2007, Crustal uplift and sea level rise 79-107. in northern C ascadia from GPS, absolute gravity, and Zerbini, S., 1997, The SELF II project, in Proceedings of the Work tide gauge data, Geophysical Research Letters , 34, L15306, shop on Methods for Monitoring Sea Level: GPS and Tide Gauge doi:10.1029/2007GL030283.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.