Josh K. Willis (presented by Dan Cayan—thanks, Dan!) Jet Propulsion Laboratory Why Californians should care about Antarctica.

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Presentation transcript:

Josh K. Willis (presented by Dan Cayan—thanks, Dan!) Jet Propulsion Laboratory Why Californians should care about Antarctica and Greenland Rising Oceans

What really causes global warming?

Side of Quelccaya ice cap, Peru Annual layers Lonnie Thompson How do we know?

2000 Years of Sea Level Sea Level Change in North Carolina

Tide Gauge Observations Average Rate ~ 1.8 mm/year 0.8 mm/year 2.0 mm/year 3.2 mm/year [Church and White, 2006] ~ 8 inches (20 cm) = 16,000 cubic miles!!! (67,000 cubic km)

Sea Level at San Francisco, CA Trend ~ 12 inches/160 years Years Relative Sea Level, mm Recent Sea Level Rise = 33% Warming/67% Melting

The altimeter record

Sea Level Rise from Satellites

Globally Averaged Sea Level Rise CauseEffect Satellite Altimeters Measure Sea Level Rise

Why so much uncertainty? How much/how fast? Greenland and Antarctic melting Projections of Future Rise Which path are we on? Jason-3 & Continuity

Surfers Point, Ventura, CA

Projections of Dynamic Height Yin, GRL, 2012

Projections of Dynamic Height

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