Using global positioning system-derived crustal velocities to estimate rates of absolute sea level change from North American tide gauge records
| Autor: | Jim Rohde, Richard A. Snay, William G. Kass, William Dillinger, Tomás Soler, Michael W. Cline, G. F. Sella, S. Hilla, Jim Ray, R. H. Foote |
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| Rok vydání: | 2007 |
| Předmět: |
Atmospheric Science
Soil Science Atoll Aquatic Science Oceanography Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Sea level Earth-Surface Processes Water Science and Technology geography geography.geographical_feature_category Ecology business.industry Paleontology Geodetic datum Forestry Glacier Geophysics Space and Planetary Science Period (geology) Global Positioning System Tide gauge Physical geography business Terrestrial reference frame Geology |
| Zdroj: | Journal of Geophysical Research: Solid Earth. 112 |
| ISSN: | 0148-0227 |
| Popis: | [1] We identified 37 tide gauges; each located within 40 km of a geodetic station whose International Terrestrial Reference Frame of 2000 (ITRF2000) crustal velocity had been rigorously derived from continuous global positioning system (GPS) observations, spanning from 3 to 11 years. The tide gauges are located along the coasts of North America, Bermuda, Hawaii, and Kwajalein (in the Marshall Islands). We obtained the ITRF2000 crustal velocities by averaging values from six solutions; each produced by a team of investigators acting, essentially, independently of the other teams. We then applied crustal velocities to convert rates of relative sea level change to rates of absolute sea level change. In a sample containing 30 sites, we found that the mean rate of absolute sea level change equals 1.80 ± 0.18 mm/yr in the 1900–1999 period. The scatter about the mean for individual sites in this sample is characterized by a (weighted) RMS value of 0.85 mm/yr. This scatter primarily reflects the uncertainty associated with derived crustal velocities. The remaining seven sites, i.e., five sites on the Pacific coast of Alaska, one on Dauphin Island (Alabama), and one on Kwajalein (an atoll in the Pacific Ocean), experienced relatively low rates of absolute sea level change. We hypothesize the low rates in Alaska are caused by ongoing melting of mountain glaciers and ice masses near the stations, while the low rates found for Dauphin Island and Kwajalein remain unexplained. |
| Databáze: | OpenAIRE |
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