Monitoring Sea Level by Tide Gauges and GPS at Barcelona and Estartit Harbours
U.S. East Coast Sea Level Acceleration: Recent Evidence from Tide Gauges
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U.S. East Coast Sea Level Acceleration: Recent Evidence from Tide Gauges
John BoonVirginia Institute of Marine ScienceGloucester Point, Virginia 23062
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Sea Level Trends: GMSL vs. RMSL
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1952
New York (The Battery), NY 1893-2011 (N = 119 yrs)
Trend Estimate: 2.97 ± 0.09 mm/yr
Linear Trend: Trend estimate from a fitted mmsl* time series of fixed length N
* monthly mean sea level (seasonal cycle removed)
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Serial Trends: Trend estimates from fitted series of fixed-length n < N ordered in time
1952
New York (The Battery), NY 1893-2011 (N = 119 yrs)
Trend Estimate: 2.97 ± 0.09 mm/yr
* monthly mean sea level (seasonal cycle removed)
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Sea Level Trends: GMSL vs. RMSL(n=10 years)
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Serial Trends: Trend Estimates from Fixed-length Series Ordered in Time
> 78 years
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Principal Components Analysis (PCA) 1933-2011 mmsl x 8 stations for varying values of n
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Serial Trends: PCA
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Serial Trends: PCA
60-year oscillation? (Chambers, Merrifield, and Nerem GRL 2012)
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Constant Acceleration over 1969-2011?
1 2
dYb b X
dX
210 1 22Y b b X b X
Y relative sea levelX time in years
(relative sea level rise rate)
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Boston, MA F = 89.67 **
Norfolk, VA F = 15.37 **
Charleston, SC F = 0.01 ns
Critical Value: F = 6.69 99% confidence level
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The 2011 La Niña: So strong the oceans fell
Boening et al., GRL 2012
95% Confidence Bands about individual mmsl heights
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Acceleration: 0.300 mm/yr2
Linear Rate: 2.88 mm/yr
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Acceleration: 0.186 mm/yr2
Linear Rate: 5.00 mm/yr
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20 years not sufficient!
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2050
2.07 ft
2100
5.85 ft
1.53 ft
U.S. Army Corps of Engineers Sea Level Calculator
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Sea Level Acceleration U.S.-Canadian Atlantic Coast Tide Stations
• RSL rise rate history informs serial trends• PCA identifies 60-year cycle in addition to• Period of near-constant acceleration that began
about 1987 as evident from serial trends• Acceleration strongest in NE and progressively
weaker toward Chesapeake Bay region• Expect mmsl 0.8 to 0.9 m above 1983-2001
MSL by 2050 between Norfolk and Boston• .. If acceleration remains constant