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Climate is Always Changing
Regional, national and global trends
Lecturer: Pam Knox, University of Georgia
Agricultural Cli...
Outline
1. Introduction: Climate vs. Weather
2. Evidence of changing climate: Natural
and human-induced
3. Climate trends ...
Climate vs. Weather
What is the difference between climate and
weather?
Climate is like a seasonal batting average
but wea...
Types of Climate
FloridaWest Virginia
Colorado Washington
Evidence of Climate Variability
Lake Lanier, GA 2007 drought
Mississippi River 1993 flood
Evidence of Changing Climate
Palouse Hills east of Walla Walla, WA
Evidence of Changing Climate
Bald Peak, NY
Death Valley, CACross Plains, WI
Mr. Rainier, WA
Evidence of Climate Change
Petrified Forest, AZMesa Verde, CO
Human-Induced Changes in Climate
Contrails
Wildfires
Pollution
Human-Induced Changes in Climate
Urban heat island Land use changes
Regional Temperature Trends
Regional Temperature Trends
Regional Temperature Trends
National Temperature Trends
National Temperature Trend
National Temperature Trends in
Extremes
Global Temperature Trend
Global Temperature Trends
National Precipitation Trends
National Precipitation Trends
Seasonal Precipitation Trends
http://www.globalchange.gov/
Global Precipitation Trends
Predicted Trends in Temperature
Across the United States, temperatures are predicted to increase
over the next 100 years, ...
Predicted Trends in Precipitation
Precipitation across the US is harder for the models to predict, and
some models show in...
What changes in climate
can we expect and when?
• Average temperatures will likely increase in all seasons by 5-10 °F
over...
What changes in climate
can we expect and when?
• Rainfall changes are hard to predict due to model differences
between di...
Summary
In this module we have covered:
• Climate vs. weather
• Evidence of changing climate
• Regional, national and glob...
Livestock and Poultry
Environmental Learning Center
Project Support
This project was supported by Agricultural and Food Re...
www.animalagclimatechange.org
National Lead: University of
Nebraska
Regional Partners: University of
Georgia; Cornell Univ...
Photo credits
http://en.wikipedia.org/wiki/Creative_Commons
All photos are from public domain sources or through Wikipedia...
http://commons.wikimedia.org/wiki/File:Glacial_Erratic_on_Bald_Peak_2010.JPG
http://commons.wikimedia.org/wiki/File:Palous...
http://commons.wikimedia.org/wiki/File:Glacial_striation_21149.JPG
http://commons.wikimedia.org/wiki/File:Chaco_Canyon_Che...
http://commons.wikimedia.org/wiki/File:Air_.pollution_1.jpg
http://commons.wikimedia.org/wiki/File:Cotton_field_kv44.jpg
h...
http://commons.wikimedia.org/wiki/File:
NOAAprecipitationtrend.jpg
Livestock and Poultry
Environmental Learning Center
Project Support
This project was supported by Agricultural and Food Re...
www.animalagclimatechange.org
National Lead: University of
Nebraska
Regional Partners: University of
Georgia; Cornell Univ...
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Climate Is Always Changing: Regional, National, and Global Trends (and how they relate to agriculture)

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For more, visit: http://www.extension.org/70286 Weather happens and the climate is always changing. Farmers are very in tune with these changes because weather is critical to any farming operation. What are the current weather trends in your area? Is it hotter? dryer? cooler? warmer? Is the growing season longer? Has the first frost date changed?

There is a real possibility that the weather of 30 years ago is not what we are seeing today or will see 30 years from now. The video to the right gives an overview of some of the weather trends.

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Climate Is Always Changing: Regional, National, and Global Trends (and how they relate to agriculture)

  1. 1. Climate is Always Changing Regional, national and global trends Lecturer: Pam Knox, University of Georgia Agricultural Climatologist
  2. 2. Outline 1. Introduction: Climate vs. Weather 2. Evidence of changing climate: Natural and human-induced 3. Climate trends in the last 100 years: Temperature, precipitation 4. What do we expect in the next 100 years?
  3. 3. Climate vs. Weather What is the difference between climate and weather? Climate is like a seasonal batting average but weather is like an individual “at bat.” Climate tells us about the average or expected conditions in an area and the range of possible conditions, while weather tells us the short-term occurrences .
  4. 4. Types of Climate FloridaWest Virginia Colorado Washington
  5. 5. Evidence of Climate Variability Lake Lanier, GA 2007 drought Mississippi River 1993 flood
  6. 6. Evidence of Changing Climate Palouse Hills east of Walla Walla, WA
  7. 7. Evidence of Changing Climate Bald Peak, NY Death Valley, CACross Plains, WI Mr. Rainier, WA
  8. 8. Evidence of Climate Change Petrified Forest, AZMesa Verde, CO
  9. 9. Human-Induced Changes in Climate Contrails Wildfires Pollution
  10. 10. Human-Induced Changes in Climate Urban heat island Land use changes
  11. 11. Regional Temperature Trends
  12. 12. Regional Temperature Trends
  13. 13. Regional Temperature Trends
  14. 14. National Temperature Trends
  15. 15. National Temperature Trend
  16. 16. National Temperature Trends in Extremes
  17. 17. Global Temperature Trend
  18. 18. Global Temperature Trends
  19. 19. National Precipitation Trends
  20. 20. National Precipitation Trends
  21. 21. Seasonal Precipitation Trends http://www.globalchange.gov/
  22. 22. Global Precipitation Trends
  23. 23. Predicted Trends in Temperature Across the United States, temperatures are predicted to increase over the next 100 years, but the amount of warming predicted depends on the particular model used.
  24. 24. Predicted Trends in Precipitation Precipitation across the US is harder for the models to predict, and some models show increased precipitation while others show drying or no trend. Some datasets indicate that rainfall has become more intense with longer dry spells in between.
  25. 25. What changes in climate can we expect and when? • Average temperatures will likely increase in all seasons by 5-10 °F over the next 100 years • Day vs. nighttime temperatures will both increase but not necessarily at the same rate • Extremes in maximum temperature will cause added heat stress • Growing seasons will lengthen
  26. 26. What changes in climate can we expect and when? • Rainfall changes are hard to predict due to model differences between different global climate models • Individual rain storms are likely to increase in intensity • Longer dry spells may occur between rain storms • Less snowfall and more liquid precipitation • Evaporation will increase due to the higher temperatures • Lower average streamflows and higher floods
  27. 27. Summary In this module we have covered: • Climate vs. weather • Evidence of changing climate • Regional, national and global climate trends • Predictions for future climate
  28. 28. Livestock and Poultry Environmental Learning Center Project Support This project was supported by Agricultural and Food Research Initiative Competitive Grant No. 2011-67003-30206 from the USDA National Institute of Food and Agriculture.
  29. 29. www.animalagclimatechange.org National Lead: University of Nebraska Regional Partners: University of Georgia; Cornell University; University of Minnesota; Texas A&M AgriLife Extension, and Washington State University. Project Partners Our Mission Animal agriculture in a changing climate fosters animal production practices that are: environmentally sound and economically viable, and that create resiliency for animal producers and their partners.
  30. 30. Photo credits http://en.wikipedia.org/wiki/Creative_Commons All photos are from public domain sources or through Wikipedia’s Creative Commons. http://commons.wikimedia.org/wiki/File:Matt_LaPorta_swinging.jpg http://commons.wikimedia.org/wiki/File:Autumn-farm-buggy-tool-shed-pubJPG_- _West_Virginia_-_ForestWander.jpg http://commons.wikimedia.org/wiki/File:Flickr_-_Nicholas_T_-_Windswept.jpg http://commons.wikimedia.org/wiki/File:Islamorada_Florida.jpg http://commons.wikimedia.org/wiki/File:Rainforest_living_up_to_its_name.jpg
  31. 31. http://commons.wikimedia.org/wiki/File:Glacial_Erratic_on_Bald_Peak_2010.JPG http://commons.wikimedia.org/wiki/File:Palouse_hills_northeast_of_Walla_Walla.jpg http://commons.wikimedia.org/wiki/File:Drumlin_-_Cross_Plains_-_WI_-_USA.JPG http://commons.wikimedia.org/wiki/File:Shoreline_Butte_Death_Valley.jpg http://commons.wikimedia.org/wiki/File:River_Forks_Park.jpg http://commons.wikimedia.org/wiki/File:FEMA_-_3438_- _Photograph_by_Andrea_Booher_taken_on_07-09-1993_in_Missouri.jpg
  32. 32. http://commons.wikimedia.org/wiki/File:Glacial_striation_21149.JPG http://commons.wikimedia.org/wiki/File:Chaco_Canyon_Chetro_Ketl_great_kiva_plaza_NPS.jpg#file http://commons.wikimedia.org/wiki/File:Petrified_forest_log_1_md.jpg http://commons.wikimedia.org/wiki/File:Contrails.jpg http://commons.wikimedia.org/wiki/File:Wildfiretopanga.jpg http://commons.wikimedia.org/wiki/File:Mesa_Verde.jpg
  33. 33. http://commons.wikimedia.org/wiki/File:Air_.pollution_1.jpg http://commons.wikimedia.org/wiki/File:Cotton_field_kv44.jpg http://commons.wikimedia.org/wiki/File:Crops.jpg http://earthobservatory.nasa.gov/Features/GreenRoof/ http://www.warwickhughes.com/climate/atlanta2.htm
  34. 34. http://commons.wikimedia.org/wiki/File: NOAAprecipitationtrend.jpg
  35. 35. Livestock and Poultry Environmental Learning Center Project Support This project was supported by Agricultural and Food Research Initiative Competitive Grant No. 2011-67003-30206 from the USDA National Institute of Food and Agriculture.
  36. 36. www.animalagclimatechange.org National Lead: University of Nebraska Regional Partners: University of Georgia; Cornell University; University of Minnesota; Texas A&M AgriLife Extension, and Washington State University. Project Partners Our Mission Animal agriculture in a changing climate fosters animal production practices that are: environmentally sound and economically viable, and that create resiliency for animal producers and their partners.

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