Sea level rise and the geoid: factor analysis approach
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Abstract:
Sea levels are rising around the world, and this is a particular concern along most of the coasts of the United States. A 1989 EPA report shows that sea levels rose 5-6 inches more than the global average along the Mid-Atlantic and Gulf Coasts in the last century. The main reason for this is coastal land subsidence. This sea level rise is considered more as relative sea level rise than global sea level rise. Thus, instead of studying sea level rise globally, this paper describes a statistical approach by using factor analysis of regional sea level rates of change. Unlike physical models and semi-empirical models that attempt to approach how much and how fast sea levels are changing, this methodology allows for a discussion of the factor(s) that statistically affects sea level rates of change, and seeks patterns to explain spatial correlations.Keywords:
Coastal sea
Tide gauge
Key Points The spatial pattern of sea level rise acceleration is explained Multidecadal climate variations unevenly affect sea level rise Discrepancies in global sea level rise from different observations are explained
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Abstract The objective of this study is to investigate the best means for referencing a regional geoid-based vertical datum to a network of tide gauges. In this study, a network of 27 tide gauge stations scattered along the coasts of Canada are used in order to assess the replacement of the conventionally derived Canadian Geodetic Vertical Datum of 1928 with a geoid-based datum. This is in-line with the future implementation plan of Canada’s geoid-based vertical height system. A mixed least-squares adjustment was performed for various scenarios, including satellite-only global geoid models, combined global geoid models and regional geoid models. In addition, various sea surface topography and vertical ground motion models were tested for estimating orthometric heights. The resulting approximation of a local equipotential surface is compared to previously published values and considerations for referencing a geoid-based vertical datum to tide gauge networks are emphasized.
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Ya ng e t a l. [1 ] assume sea level rise induced by global warming is real, and that sea levels may rise by 1 meter by 2100. They then go on to derive ecological conclusions from these assumptions. There is of course no foundation for the ecological speculation if the basic assumptions are false. Real tide gauge data show that sea level is rising slowly, both worldwide and the US, without any acceleration. As shown in this comment, the last 3 NOAA surveys of sea level rises, compiled in 1999, 2006 and 2013, indicate that the rate of sea level rise is reducing from one survey to the next.
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