Climate change projections of sea level extremes along the California coast
California’s coastal observations and global model projections indicate that California’s open coast and estuaries will experience rising sea levels over the next century. During the last several decades, the upward historical trends, quantified from a small set of California tide gages, have been approximately 20 cm/century, quite similar to that estimated for global mean sea level. In the next several decades, warming produced by climate model simulations indicates that sea level rise (SLR) could substantially exceed the rate experienced during modern human development along the California coast and estuaries. A range of future SLR is estimated from a set of climate simulations governed by lower (B1), middle–upper (A2), and higher (A1fi) GHG emission scenarios. Projecting SLR from the ocean warming in GCMs, observational evidence of SLR, and separate calculations using a simple climate model yields a range of potential sea level increases, from 11 to 72 cm, by the 2070–2099 period. The combination of predicted astronomical tides with projected weather forcing, El Niño related variability, and secular SLR, gives a series of hourly sea level projections for 2005–2100. Gradual sea level rise progressively worsens the impacts of high tides, surge and waves resulting from storms, and also freshwater floods from Sierra and coastal mountain catchments. The occurrence of extreme sea levels is pronounced when these factors coincide. The frequency and magnitude of extreme events, relative to current levels, follows a sharply escalating pattern as the magnitude of future sea level rise increases.
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- Bromirski PD, Cayan DR, Flick RE (2005) Wave spectral energy variability in the northeast Pacific. J Geophys Res 110:C03005, DOI 10.1029/2004JC002398
- Cazenave A, Nerem RS (2004) Present-day sea level change: observations and causes. Rev Geophys 42: RG3001, DOI 10.1029/2003RG000139
- Church JA, White NJ (2006) twentieth century acceleration in sea level rise. Geophys Res Lett 33: (LO1602) DOI 10.1029/2005GL024826
- Church JA, Gregory JM, Huybrechts P, Kuhn M, Lambeck K, Nhuan MT, Qin D, Woodworth PL (2001) Changes in sea level. Chapter 11 of the intergovernmental panel on climate change third assessment report. Cambridge University Press, Cambridge, pp pp 639–694Google Scholar
- Flick RE (1998) Comparison of California tides, storm surges, and mean sea level during the El Niño winters of 1982–1983 and 1997–1998. Shore & Beach 66(3):7–11Google Scholar
- Flick RE (2000) Time-of-day of peak tides in a mixed-tide regime. Shore & Beach 68(4):15–17Google Scholar
- Holgate SJ, Woodworth PL (2004) Evidence for enhanced coastal sea level rise during the 1990’s. Geophys Res Let 31: L07305, DOI 10.1029/2004GL019626
- Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Leetmaa A, Reynolds B, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo KC, Ropelewski C, Wang J, Jenne R, Joseph D (1996) The NCEP/NCAR 40-year reanalysis project. Bull Amer Meteor Soc 77:437–471CrossRefGoogle Scholar
- Ryan H, Gibbons H, Hendley JW, Stauffer P (2000) El Niño sea-level rise wreaks havoc in California’s San Francisco Bay Region. USGS Fact Sheet 175–99. Available online at: http://geopubs.wr.usgs.gov/fact-sheet/fs175–99/
- Seymour RJ (1998) Effects of El Niños on the west coast wave climate. Shore and Beach 66(3):3–6Google Scholar
- Seymour RJ, Strange RR, Cayan DR, Nathan RA (1984) Influence of El Niños on California’s wave climate: in Proceedings of the 19th Coastal Engineering Conference: American Society of Civil Engineers. v. 1, p. 577–592Google Scholar
- Storlazzi CD, Griggs GB (1998) The 1997–98 El Niño and erosion processes along the central coast of California. Shore and Beach 66(3):12–17Google Scholar
- White NJ, Church JA, Gregory JM (2005) Coastal and global averaged sea level rise for 1950 to 2000. Geophys Res Let 32: L01601, DOI 10.1029/2004GL021391