Climate Change Basics: Issues and Impacts for Climate Change Basics: Issues and Impacts for Boating Boating National Association of State Boating Law Administrators September 10, 2008 David F. Zierden Florida State Climatologist Center for Ocean Atmospheric Prediction Studies The Florida State University
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Climate Change Basics: Issues and Impacts for Boating
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Climate Change Basics: Issues and Impacts for Climate Change Basics: Issues and Impacts for BoatingBoating
National Association of State Boating Law Administrators
September 10, 2008
David F. Zierden
Florida State Climatologist
Center for Ocean Atmospheric Prediction Studies
The Florida State University
What is a State Climatologist?What is a State Climatologist?
• Originally a NOAA program until 1973
• States urged to appoint their own SC
• Most states made it a faculty appointment at the land grant university
• Title transferred to FSU after a number of years
• Appointed by the department Chair
• MOU with partners at NOAA NWS and NCDC
• Office certified by the American Association of State Climatologists
Enjoying BoatingEnjoying Boating
IntroductionIntroduction
““Climate Change” versus “Global Warming”Climate Change” versus “Global Warming”
Climate change is ongoing and has many causes, both natural and man-made.
Natural causes:• Changes in solar intensity• Eccentricity in the earth’s orbit and “wobbles”• Vegetation, albedo changes• Volcanic eruptions• Coupled ocean/atmospheric cycles Man-made causes:• Urbanization• Land use changes (irrigation of semi-arid areas,
draining wetlands)• Aerosols• Greenhouse gases “Global warming” specifically refers to a general
warming of the planet due the anthropogenic increase in greenhouses gases.
Unfortunately, “climate change” is now misconstrued as the same as “global warming.”
Climate change is a contentious issue…
Pro - Global Warmin
• Charlie Christ (FL), Ted Kulongoski (OR)
• Environmental groups
• Hollywood
• Liberal media
Scientists• IPCC• Dr. James Hansen (NASA)
• Dr. Kevin Trenberth (NCAR)
• Dr. Tom Karl (NCDC)
Perceived Skeptics:• Rush Limbaugh• George Bush• Big oil, big industry• Conservative media
Scientists• Dr. William Gray (CSU)• Dr. John Christy (UAH)• Dr. Chris Landsea (NHC)• Dr. Roger Pielke, Sr. (UC)• Dr. James O’Brien (COAPS)
IPCC 4 ConclusionsIPCC 4 Conclusions
“Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level.”
“Global atmospheric concentrations of CO2, methane (CH4) and nitrous oxide (N2O) have increased markedly as a result of human activities since 1750 and now far exceed pre-industrial values determined from ice cores spanning many thousands of years.”
“Most of the observed increase in globally-averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic GHG concentrations.”
- IPCC 4 Summary for Policy Makers
Criticisms:
• politicized process
• improper review
• understates the importance of other natural and man-made forcings
• inadequate communication of uncertainties
Florida Climate Center on Climate ChangeFlorida Climate Center on Climate Change
O’Brien
Zierden
Growing interest in climate change issues:
• IPCC 4 and Al Gore
• New administration in Florida
• Changing markets - biofuels and ethanol production
• Carbon credits and markets
• Sustainability
New Emphasis on Climate Change
“Governor Crist is passionate about government leading by example… The three Executive Orders represent the Governor’s commitment to addressing global climate change.”
Natural Causes of Climate Natural Causes of Climate ChangeChange
Milankovitch CyclesMilankovitch Cycles
Changes in the eccentricity of the earth’s orbit, obliquity, and precession of the equinoxes are the main triggers to the 100,000 year ice age cycles.
Sunspot CyclesSunspot Cycles
The number of sunspots varies on an 11-year cycle. High numbers of sunspots correspond to increased solar irradiance and solar winds.
The El Nino/La Nina cycle is the predominant mode of year to year climate variability. Other modes include:
• Pacific decadal oscillation
• North Atlantic oscillation
• Atlantic multidecadal oscillation
Greenhouse Gas ConcentrationsGreenhouse Gas Concentrations
The “Greenhouse” EffectThe “Greenhouse” Effect
Atmospheric Composition and radiative Atmospheric Composition and radiative AbsorptionAbsorption
Historical Greenhouse Gas ConcentrationsHistorical Greenhouse Gas Concentrations
Global and Regional TemperatureGlobal and Regional Temperature
Reconstructed Temperature RecordsReconstructed Temperature Records
“the Holocene, which has already lasted 11,000 years, is, by far, the longest stable warm period recorded in Antarctica during the past 420,000 years,”
- Petit, et. al., 1999
Modern Day TemperaturesModern Day Temperatures
Southeast Temperature TrendsSoutheast Temperature Trends
Annual Average TemperatureAL, FL, GA and all three
Other Possible Outcomes with RainfallOther Possible Outcomes with Rainfall
• Rainfall has become more extreme (larger events) in the last 50 years (Karl, et al.)
• As temperatures warm, warm air holds more moisture and rainfall should increase.
• We don’t know exactly when, where, how much this increase will be.
• Warmer climate may also lead to more extreme rainfall and extended droughts.
• How a changing climate will effect lakes, rivers, coastal areas is highly uncertain.
Climate Change and HurricanesClimate Change and Hurricanes
Hurricanes and Global Warming?Hurricanes and Global Warming?
Emanuel (Nature, 2005) – Hurricane power has increased in recent decades due warmer sea surface temperatures part to global warming
Webster, et al. (Science, 2005) –
The number of category 4 and 5 hurricanes have doubled in the last 30 years, due to global warming.
Atlantic HurricanesAtlantic Hurricanes
“Over the long term the effects of changes in society dwarf the effects of any projected changes in tropical cyclones…”
“…claims of linkages between global warming and hurricane impacts are premature…”
- Pielke, et. al., 2005
“Thus large, long-term ‘trends’ in tropical cyclone frequency are primarily manifestations of increased monitoring capabilities and likely not related to any real change in the climate in which they develop.”
- Landsea, 2007
Sea Level RiseSea Level Rise
What if sea level rose 6 meters?What if sea level rose 6 meters?
Image courtesy of Environmental Studies Laboratory, University of Arizona
Causes of Sea Level RiseCauses of Sea Level Rise
Global sea level can rise from two primary causes:
2) Warming of the oceans
3) Melting of ice caps and glaciers
Historic sea level riseHistoric sea level rise
• Sea level measurements from 23 highest quality tidal stations around the world.
• Estimates of sea level rise from 1 mm/yr to 2 mm/yr.
• Satellite measurements (altimeters) since 1992 indicate a rise of around 3mm/yr.
• IPCC third assessment report stated "No significant acceleration in the rate of sea level rise during the 20th century has been detected."
Local sea level measurementsLocal sea level measurements
•The physics of water vapor, clouds, and precipitation are poorly represented.
• Limited spatial resolution
• Climate models have not demonstrated the ability to reproduce the modes of variability seen in the 20th century.
• Cannot accurately predict regional shifts in temperature or precipitation.
• Coupling between the atmosphere and the ocean, land surface, and ice surfaces is limited.
Global Warming “Myths”Global Warming “Myths”
“Throw out the record books, because global warming is raising temperatures in Florida and across the country,”
- Environment Florida
"In low-lying areas, anticipated sea-level rise could force water to flow horizontally as much as 400 feet or more inland--flooding shoreline homes and hotels and eroding Florida's famous beaches,"
- NRDC
“The Union of Concerned Scientists predicts a three- to 10-degree Fahrenheit rise in winter low and summer high temperatures for Florida as a whole. Northern Florida, the group says, will suffer the most from loss of soil moisture.”