a geological perspective on sea-level rise and its impacts · 2014-10-28 · a geological...
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![Page 1: A geological perspective on sea-level rise and its impacts · 2014-10-28 · A geological perspective on sea-level rise and its impacts Ken Miller, Dept. Earth & Planetary Sci., Rutgers](https://reader033.vdocuments.us/reader033/viewer/2022052801/5f175a07a7782a2bb57d6489/html5/thumbnails/1.jpg)
A geological perspective on sea-level rise and its impacts
Ken Miller, Dept. Earth & Planetary Sci., Rutgers University,
Front Pages November 1, 2012 [email protected]
Department of Earth and Planetary Sciences
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2008 (Miller)
3 ft sea-level rise ~2100 CE 1 ft sea-level rise ~2040 CE
Oct. 31, 2012 (AP) N
N
N N
Ship Bottom, Long Beach Island, NJ
http://slrviewer.rutgers.edu
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Storms: Extreme sea-level events
http://www.nhc.noaa.gov/surge/
Storm surge = water piled up by storm (a transient sea-level rise) Tide: 4-5 ft at Atlantic City 5 ft = “spring” astronomically high tide Storm tide = surge + tide = flood level (referenced to MLLW)
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Atlantic City tide gauge record: 8.9 ft
NOAA = National Oceanic & Atmospheric Administration
8:24 PM
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Worst hit: Houses and areas destroyed Seaside-Mantoloking (1167), Long Branch-Highlands (1457), Hoboken (891),
Queens (2,973) and Long Beach (2670)
Source: New York Times Dec. 22, 2012
Ortley 567
LBI 194
Tuckerton 130
AC/Brigantine 70
Ocean City 104
Seaside H 80
Normandy 151
Mantoloking 102
Manasquan 267
Long Beach 2,670
Queens 2,973
Hoboken 891
Union Beach 268
Long Branch- Highlands
1457
Seaside-Mantoloking 1167
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Mantoloking Inlet
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Mantoloking, NJ
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Mantoloking Bridge Rt. 528 Oct. 2008 Byrne Seminar overflight © Miller/Browning
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http://www.capitolromance.com/2012/11/02/lets-get-personal-struggling-to-blog-post-hurricane-sandy/mantoloking-bridge-day-after-sandy/
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Mantoloking Inlet on the ground http://www.hjnews.com/blogs/seeingthebigpicture/?p=262
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Destruction of Ortley Beach, NJ
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Ortley Beach, NJ 2009 overflight © Miller/Browning
Joey Harrison’s Surf Club, Ortley Beach, NJ 2009 overflight © Miller/Browning
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Ortley Beach in an aerial view of devastation 10/31/12 Andrew Mills/The Star-Ledger) http://photos.nj.com/star-ledger/
2012/10aerial_views_of_hurricane_sand_2.html
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Ortley Beach in an aerial view of devastation 10/31/12 (Andrew Mills/The Star-Ledger) http://photos.nj.com/star-ledger/
2012/10aerial_views_of_hurricane_sand_2.html
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The burning of Normandy Beach and Camp Osborn
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Camp Osborn, Normandy Beach, NJ (box in red in next photo)
Camp Osborn
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Normandy Beach Oct. 2008 Byrne Seminar overflight © Miller/Browning
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Normandy Beach, Oct. 2008 Byrne Seminar overflight © Miller/Browning
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Camp Osborn
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2009 overflight © Miller/Browning
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http://photos.nj.com/star-ledger/2012/10 aerial_views_of_hurricane_sand_10.html
Camp Osborn, note washover fan
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The drowning of Holgate & Beach Haven
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Holgate
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Forsythe Preserve to Holgate Oct. 2009 Byrne Seminar
overflight © Miller/Browning
Holgate Oct. 2009 Byrne Seminar overflight ©
Miller/Browning
Holgate
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Holgate 2010 overflight © Miller/Browning
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http://www.facebook.com/LindysLbi/photos_stream
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http://www.facebook.com/LindysLbi/photos_stream
http://www.state.nj.us/governor/media/photos/2012/eventphotos/20121110/20121110Sandy118.JPG
Mayhem in Holgate
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http://www.womanaroundtown.com/sections/living-around/jersey-jen-coming-to-terms-with-the-destruction-sandy-has-wrought-on-my-beloved-jersey-shore
Beach Haven Destruction http://www.youtube.com/watch?v=qT_xAPOMtcg
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27th Street Ship Bottom became an icon for Sandy’s
effects on LBI
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http://www.youtube.com/watch?v=qeWOzIsZ774
Ship Bottom Oct. 30, 2012
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The Saving of Harvey Cedars & Loveladies
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www.nj.gov/dep/ec/docs/harvey_cedars_overview.pdf
Mercer Ave., Harvey Cedars before and after beach nourishment
U.S. Army Corps of Engineers nourished Harvey Cedars Sept. 2009 to June 2010 for $19 million; borough and Ocean County splitting a $2 million share.
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North Beach to south Harvey Cedars: sand washover, beach narrowed, houses survided
http://storms.ngs.noaa.gov/storms/sandy/
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Stew Farrell, Stockton University: "In general beach nourishment prevented a great deal of additional damage with LBI being the
poster child for such conclusions."
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Mayor Mancini Long Beach Twp. Beach Haven Nov. 30: “Cost of cleanup and restoration…be bourne by those oceanfront
property owner who refused to join the project”
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`
Ash Wed. Nor’easter, H. Cedars, 1962
Ash Wed. 1962 Nor’easter Harvey Cedars
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Hurricane Donna hits New York 1960
http://www.netquake.net/2012/10/photos-the-most-devastating-hurricanes-in-new-york-history/
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100 yr storm
10 yr storm
The Battery, New York tide gauge
Sandy 13.9 ft
Donna 10 ft
Heights in blue relative to Mean Lower Low Water (FEMA standard)
Irene 9.5 ft Dec. ‘92
9.8 ft sea level rise 50 yr storm
Department of Earth and Planetary Sciences Modified after Zervas (2005)
Governor Cuomo “There’s only so long you can say, this is once in a lifetime and it’s not going to happen again.”
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Causes of sea-level change Global sea level raised by: temperature: warming expands seawater (less dense) ice volume: melt ice (mountain glaciers & ice sheets)
Department of Earth and Planetary Sciences
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Causes of sea-level change Regional sea level
1) Subsidence (sinking) or uplift tectonics (e.g., Alaska uplift) includes glacial isostatic adjustment (GIA)
2) Oceanographic effects (e.g., El Nino, Gulf Stream changes)
Local sea level Compaction due to natural processes & groundwater extraction
Department of Earth and Planetary Sciences
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0
50
100
150
200
250
300
350
400
05,00010,00015,00020,000
Years before present
Sea
leve
l (fe
et)
last glaciation 390 ft lower 120 m Fairbanks (1989)
Meltwater pulse 1A 190 inches/century
16 ft/century 47 mm/yr (Dechamps et al., 2012)
Meltwater pulse 1B 110 inches/century
9 ft/century 27 mm/yr
7-5 kyr 15 inches/century (3.8 mm/yr)
Global sea-level rise past 20,000 years Barbados approximates global average sea level
Sea level was 390 ft (120 m) lower 20,000 yr ago
Rapid rises 14,000 & 12,000 yrs ago (MWP1)
Slow rise 7,000 to 3,000 yr ago (1,000 BCE)
Modified after Fairbanks (1989)
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1st millenium 0 rise; Medieval Warm 2.3 inches/century (0.6 mm/yr);
Little Ice Age ~0 rise; 20th century 7 inches/century (1.7 mm/yr)
Kemp et al. (2011)
Little ice age Roman Warm Period
0.65
-0.65
Sea
leve
l fee
t
Is modern sea-level rise part of a natural cycle?
Medieval Warm Period
Department of Earth and Planetary Sciences
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Global sea level is rising and accelerating Tide Gauges 1880-2006
6.7 inches per century 1.7±0.4 mm/yr
Church & White (2006)
Satellite data 1993-2013 12 inches per century 3.2±0.4 mm/yr http://sealevel.colorado.edu/
Department of Earth and Planetary Sciences
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Why Is global sea level is rising today?
Thermal Expansion: ocean has gained heat Warmer water is less dense
global temperature increase explains about 1/3 modern rise
Melting Glaciers & Ice Caps Melting land ice raises sea
level, but not sea ice
Alpine
http://www.nodc.noaa.gov/OC5/3M_HEAT_CONTENT/
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Why Is global sea level Is rising today?
.
~ 30% rise is due to melting mountain glaciers Prior to 2003, < 15% sea level rise was from
melting ice sheets, now greater (Cazenave & Le Cozanne, 2014)
How much sea level is stored in ice sheets? Greenland ~23 ft (7 m) W. Antarctica ~16 ft (5 m) E. Antarctica 170 ft (52 m)
Mountain glaciers
Change of surface elevation Pritchard et al. (2009)
IPCC (2001)
Length
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Revised mass loss figures from ice sheets Mass loss from Greenland and West Antarctica appears to be accelerating
Shepherd et al. (2012)
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National Research Council projections 2012
Scenario-based projections of global sea-level rise by 2100 of 2.7 ft (range 1.7-4.6 feet)
Department of Earth and Planetary Sciences
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Global versus Regional Effects 12 inches/century = 3 mm/yr
global global
16 inches/century = 4 mm/yr
Mid-Atlantic tide gauges; blue = data, green = smoothed fit. Kopp (2013) & Miller et al. (2013)
Global average tide gauges (pink) 6.7 inches/century (1.7 mm/yr) Church & White (2006)
global
Department of Earth and Planetary Sciences
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http://www.dreamstime.com/royalty-free-stock-photos-3d-people-seesaw-image15520048
GIA: Glacial Isostatic Adjustment Melting of ice sheets results in a regional adjustment: sinking
(blue) in some areas, uplift (red) in others
Department of Earth and Planetary Sciences
Ice sheet us
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Fall (red) line separates bedrock & coastal plain
Bedrock sites NYC/Bayonne, Phil./Camden, Baltimore, D.C.
12 inches/century (3 mm/yr) = global + GIA regional
Coastal plain sites Sandy Hook–Norfolk 16-18 in./century (3.5-4.5 mm/yr) = global + regional + compaction
Miller et al. (2013)
Regional vs local sea level from tide gauges
Department of Earth and Planetary Sciences
~12 ~14 ~16 ~18
in./century
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Subsidence and oceanographic effects
Dynamic oceanographic effects Reduction in Gulf Stream/MOC flow raises sea level in mid-Atlantic region by 4-8 inches by 2100 (10-20 cm)
Mid-Atlantic subsidence 4-8 inches/century (1-2 mm/y)
http://tidesandcurrents.noaa.gov/publications/EastCoastSeaLevelAnomaly_2009.pdf
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Local subsidence 4 inches/century due to compaction due to natural compaction and groundwater withdrawal
Glo
bal +
GIA
Coastal plain > NYC (= GIA + global)
loca
l
Department of Earth and Planetary Sciences
Miller et al. (2013)
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Future sea-level rise mid-Atlantic US
Shore = Atlantic City, Cape May 1.5 ft by 2050, 3.5 ft by 2100 Bedrock = NYC, Phil., Baltimore, D.C.: 1.3 ft by 2050, 3.1 ft by 2100
Department of Earth and Planetary Sciences
Miller et al. (2013)
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Future sea-level rise mid-Atlantic US
Department of Earth and Planetary Sciences
Miller et al. (2013)
Shore = Atlantic City, Cape May 1.5 ft by 2050, 3.5 ft by 2100 Bedrock = NYC, Phil., Baltimore, D.C.: 1.3 ft by 2050, 3.1 ft by 2100
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Future sea-level rise mid-Atlantic US
Department of Earth and Planetary Sciences
Miller et al. (2013) Shore = Atlantic City, Cape May 1.5 ft by 2050, 3.5 ft by 2100
Bedrock = NYC, Phil., Baltimore, D.C.: 1.3 ft by 2050, 3.1 ft by 2100
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Effects of sea-level rise: Coastal flooding By 2100, a “5 to 10-yr storm” will have the flooding of a modern
“100-yr storm”
My house Dec. 1992 nor’easter
My block Sandy 4 PM
Typical nor’easter Nov. 8, 2012
Department of Earth and Planetary Sciences
Miller et al. (2013)
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Slide provided by R. Kopp based on Kopp et al (2014)
Odds for a 2 ft rise on the Jersey shore by years
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Take-home points Sea-level rise appears to be accelerating. By 2100 global average sea level will likely be more than 2.5 ft higher than it is today.
NYC in an ice-free world
Ship Bottom 2100
Department of Earth and Planetary Sciences
Storm surge is added to the sea-level rise: a 5-10 yr storm in 2100 will have the same effect a 100 yr storm has now.
FEMA/NOAA FIRM do not include sea-level rise.
Both regional and local effects add to sea-level rise. Mid-Atlantic region should plan for: 1.5 ft sea level rise by 2050 >3 ft sea level rise by 2100 By 2100 we will face a fundamentally different Jersey shore.
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Recommendations 2050 sea-level estimates for the NJ shore are 1.5 ft and range
from 1.1-2.3 feet. Zoning for low-impact structures (e.g., housing) should target at least 1.5 ft above FEMA ABFE flood levels.
Department of Earth and Planetary Sciences
For municipal planning for structures with life spans beyond 40-50 years (e.g., transportation, water, wastewater, energy, communications) should use higher figures.
For purposes of planning infrastructure projects with significant
public investments with life spans from 2050 to 2100, it is prudent to employ higher scenarios.
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Thank you! Questions?
NYC in an ice-free world
Department of Earth and Planetary Sciences