Climate Change and its Effects on Ecosystems
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The document discusses the impacts of climate change on ecosystems, emphasizing the shift in weather patterns, such as increased rainfall and less snowfall. It highlights the growing consensus among scientists about human contributions to climate change and its rapidity, along with the potential consequences for forestry, agriculture, and biodiversity. Key expected changes include alterations in plant growth seasons, habitat suitability, and the rise of invasive species, compounded by extreme weather events and shifts in pest populations.
Climate Change and its Effects on Ecosystems
- 1. CLIMATE CHANGE AND ITS EFFECTS ON ECOSYSTEMS www.forestadaptation.org H2H Conservation in a Changing Climate
- 2. Northern Institute of Applied ClimateScience www.nrs.fs.fed.us/niacs/ Climate Carbon Bioenergy NIACS is a regional multi-institutional partnership Forest Service Northern Research Station Eastern Region Northeastern Area S&PF Non-FS partners Michigan Technological University National Council for Air & Stream Improvement Trust for Public Land
- 3. 6 Project Areas 246 Million Acres 14 National Forests 100+ Partners (Federal, State, Tribal, Private) forestadaptation.orgClimate-Informed Conservation and Forest Management CLIMATE CHANGE RESPONSE FRAMEWORK Northwoods 64 million acres Central Appalachians 28 million acres New England 52 million acres Mid-Atlantic 60 million acres Urban Central Hardwoods 42 million acres
- 4. Partnerships Vulnerability Assessment Forest Adaptation Resources Adaptation Demonstrations Climate Change Response Framework Components: Progress: 100+ partner organizations (and counting) 5 published assessments, 1 in press, 2 in prep Published in 2012, updated and online versions in prep 60+ demonstrations underway Structured, process oriented, works on multiple scales
- 6. Scientists still disagree about climate change, right? So who am I supposed to believe?
- 7. Disagreement? Intergovernmental Panel on Climate Change (2007) • Evidence for climate change is “unequivocal” • It is “extremely likely” that humans are major contributors • Future changes depend partly on human actions 18 National Academies have endorse the consensus position in IPCC 2007 • National Academy of Sciences (USA) • Royal Society of Canada
- 9. Scientists still disagree about climate change, right? So who am I supposed to believe? • No scientific debate on “if”. • Current scientific debate revolves around how much, how fast, and feedback mechanisms. • Most climate scientists agree humans are a driver. A practical risk assessment may be a better strategy than belief.
- 10. Hasn’t climate always changed? Why worry now?
- 11. Change happens. Eccentricity – more or less oval orbit, every ~100,000 years Precession – earth wobbles on its axis, every ~23,000 years Tilt – earth shifts its tilt every ~41,000 years Milankovitch Cycles www.windows2universe.org
- 12. Change happens. http://www.brighton73.freeserve.co.uk/gw/paleo/400000yrfig.htm; see also: Hansen et al. 1990, Petit et al. 1999, Shackleton 2000, Ruddiman 2006, Shakun et al. 2012
- 13. IPCC 2007 The average global surface temperature has risen 1.4 ºF over the past 100 years Change happens.
- 14. Hasn’t the climate always changed? Why worry now? • Milankovitch cycles have previously driven climate changes. • Humans are driving the current change. • The change is very rapid. The rapidity and potential severity of climate change will affect forestry, agriculture, infrastructure, demographics, economies, …virtually everything.
- 15. The atmosphere is massive, how can we actually change it?
- 18. Anthropogenic change? ▪ Global GHG emissions from human activities increased 70% between 1970-2004 ▪ Emissions of CO2, the most important anthropogenic GHG, grew about 80% between 1970 and 2004. IPCC 2007
- 19. The atmosphere is massive, how can we change it? • We move massive amounts of carbon into the atmosphere. • Fossil carbon is an addition – it has been isolated from the carbon cycle for millions of years. • Land cover change transfers carbon to the atmosphere. The measurement record clearly shows our additions to the atmosphere.
- 20. How has climate changed over the past century?
- 21. Observed Climate Trends Warmer temperatures CT temperatures increased more than 2.5°F since 1895 Winter has warmed most Extremely hot days have increased Longer growing season Plants flowering more than a week earlier at Walden pond since 1880s Annual Temperature Change since 1895 NOAA
- 22. Observed Climate Trends Altered Precipitation CT precipitation increased nearly 3” since 1895 Extremely high variability from year to year Slight decrease in spring; increase of 2” in fall Substantial increases in extreme rain events: 71% increase across northeast since 1958 Annual Precipitation Change since 1895 Increase in Extreme Rain Events since 1958 NOAA, Melillo et al. 2014
- 23. Observed Climate Trends Sea-level Rise Sea level rose about 1 foot since 1900 Increases in coastal flooding Horton et al. 2014 (NCA)
- 24. How is the climate expected to change over the next century?
- 25. Future Changes – inherent uncertainty IPCC 2007
- 26. Anticipated Climate Changes Warmer temperatures 3-9°F increase annually Altered precipitation High variability: slight decrease to more than 15% increase Generally increasing in winter & spring Potential decreases or less substantial increases in summer & fall More extreme rain Sea-level Rise 12 to 23” by end of century CT DEEP 2011, Climatewizard.org
- 27. How could ecosystems be affected?
- 28. WATER: Less Snow Projected decreases in snow fall, cover, and depth 30-70% decreases in snowfall Greatest snowfall decreases in December or January Percent change in snowfall (late 21st century) Notaro et al. 2014; Figure: Center for Climatic Change, http://ccr.aos.wisc.edu/resources/data_scripts/LCC/ Percent Change in Snowfall Low (B1) High (A2)
- 29. WATER: Less Snow, but More Rain Precipitation is projected to increase = more rain Dale et al 2001, Huntingon 2004, Parmesan 2006
- 30. WATER: Less Snow, but More Rain Precipitation is projected to increase = more rain Altered streamflow timing and amount Earlier spring peak flows Potential increases in flashiness and episodic high flows Potential declines in summer seasonal stream flow Dale et al 2001, Huntingon 2004, Parmesan 2006
- 31. WATER: Potential for SummerDrought Greater uncertainty about future precipitation, but increased risk of summer moisture stress Water loss from soils (evaporation) Water loss from trees (transpiration) Groundwate r recharge Runoff Precipitation
- 32. WATER: Potential for SummerDrought Greater uncertainty about future precipitation, but increased risk of summer moisture stress Water loss from soils (evaporation) Water loss from trees (transpiration) Groundwate r recharge Runoff Precipitation Warmer temps increase water loss
- 33. PLANTS: Longer Growing Season Warmer temps result in longer growing seasons Projected to increase 3-7+ weeks Evidence of phenological shifts Longer period for plant growth Potential risks: Early bud break/loss of cold hardening Frost damage during spring freezing Melillo et al. 2014, Nelson Center 2014
- 34. PLANTS: Changes in Suitable Habitat Habitat based on: Temperature Precipitation Elevation Latitude Soils Slope & Aspect Land use Competition Past management
- 35. PLANTS: Changes in Suitable Habitat Habitat based on: Temperature Precipitation Elevation Latitude Soils Slope & Aspect Land use Competition Past management Climate Change Atlas: What happens to tree and bird habitat when climate changes? •134 Trees •147 Birds Iverson et al. 2008; Atlas website: www.fs.fed.us/nrs/atlas/ www.fs.fed.us/nrs/atlas/
- 36. PLANTS: Changes in Suitable Habitat Habitat based on: Temperature Precipitation Elevation Latitude Soils Slope & Aspect Red Spruce: Current Habitat (modeled) www.fs.fed.us/nrs/atlas/
- 37. PLANTS: Changes in Suitable Habitat Habitat based on: Temperature Precipitation Elevation Latitude Soils Slope & Aspect Red Spruce: Current Habitat (modeled) PCM B1 (Less Change) GFDL A1FI (More Change) www.fs.fed.us/nrs/atlas/
- 38. PLANTS: Changes in Suitable Habitat Habitat based on: Temperature Precipitation Elevation Latitude Soils Slope & Aspect Black Oak: Current Habitat (modeled) PCM B1 (Less Change) GFDL A1FI (More Change) www.fs.fed.us/nrs/atlas/
- 39. PLANTS: Changes in Suitable Habitat Immense lag times • Range shifts ≠ instant catastrophic dieback Factors causing change will increase over time • Temperature • Moisture • Competition Mature and established trees should fare better • Developed root system • Greater carbohydrate reserves Game changers: Disturbance, Land use, … Dale et al. 2001, Iverson et al. 2008
- 40. PLANTS: InvasivePlants Expanded ranges under warmer conditions Stress or disturbance from other impacts can affect the potential for invasion or success Invasives Plants Atlas of New England (www.eddmaps.org) Dukes et al. 2009, Rustad et al. 2011
- 41. Dan Turner, Cambridge Fire Dept. DISTURBANCE: Extreme Events Heavy precipitation Ice storms “Events” are not well modeled Heat waves/droughts Wind storms Hurricanes VTRANS/VT ANR NY DEC
- 42. DISTURBANCE: Insect Pests & Diseases Stress from other impacts increases susceptibility Pests migrating northward Decreased probability of cold lethal temperatures Accelerated lifecycles Ayres and Lombardero 2000, Woods et al. 2005, Parmesan 2006, Dukes et al. 2009 Image: Frumhoff et al. 2007 HWA lethal temp: -20 to -30°F
- 43. Where do we go from here? Climate Change Impacts 1) Less Snow, More Rain 2) Potential for Summer Drought 3) Longer Growing Season 4) Changes in Suitable Habitat 5) Invasive Plants 6) Extreme Events 7) Forest Pests and Diseases
- 44. Vulnerability: Local Considerations Research and assessments describe broad trends but local conditions make the difference.