Climate Change and Public Health Maine’s Climate Future (and past) George L. Jacobson Professor Emeritus of Biology, Ecology, and Climate Change Maine.

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Presentation transcript:

Climate Change and Public Health Maine’s Climate Future (and past) George L. Jacobson Professor Emeritus of Biology, Ecology, and Climate Change Maine State Climatologist Climate Change Institute The University of Maine April 7, 2010

Climate Change Institute (formerly Institute for Quaternary and Climate Studies) Climatology/Paleoclimatology Historic climatology Terrestrial paleoecology Paleolimnology Prehistoric archaeology Glacial geology and glaciology Atmospheric chemistry (incl. ice cores) Geochemistry Maine State Climatologist (GLJ) “Maine Climate News” Web Site

Climate Change Institute The University of Maine Central question: What is the natural variability of the earth’s climate, and what are the underlying mechanisms?

Weather or climate?

El Nino tendency over time (Nov. to Mar.)

All-time state record low temperature (– 50 F) 16 Jan 2009 OFFICIAL RECORD

20,000 years ago was the most recent glacial maximum Maine under ice

Regular ice ages characterize the past million years (information derived from ocean sediments) warm cold Present interglacial (Holocene)

C.D. Keeling – IGY 1957

390 ppm as of February 2010

Projections show Maine becoming warmer and wetter in all regions of the state.

Was this winter a taste of late-21 st Century norms in Maine?

Maine’s climate is highly compressed: equal to that of northern Europe

Maine’s steep climate gradient produces interesting patterns of range limits in plants.

Plant-hardiness zones have been shifting northward

Lakes have become ice-free earlier in the year

Range of deer ticks is spreading northward in recent years.

Future change are just the opposite of what happened in the past 1000 years --- southward expansion of spruce during a cool period.

Sea-level rise is likely to accelerate

Courtesy UM Prof. Gordon Hamilton

Implications for Maine of global instabilities caused by climate change (broadly defined): Potential demand for resources (water, food, space, etc.) Economic disruptions of many kinds National security instabilities Cumulative demand for health-related services & resources Many others…

Discussion?

Records of atmospheric N 2 O and of Dansgaard–Oeschger events over a 16,000- year interval during the last ice age. Schmittner & Galbraith (2008) Nature 456: