Impacts of Acute Warming on Arctic Flora and Fauna Dr. Natalie Boelman Earth2Class Workshops for Teachers 11 January 2014.

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Presentation transcript:

Impacts of Acute Warming on Arctic Flora and Fauna Dr. Natalie Boelman Earth2Class Workshops for Teachers 11 January 2014

Dr. Natalie Boelman Explores the cascade of changes triggered when Arctic vegetation and seasonality are altered Response of animal populations to simulated or current climate changes drastically understudied in the Alaskan interior and much of the Arctic

Multi-trophic impacts of climate warming in Arctic tundra: from plants to bugs to migratory songbirds Five year ( ) study on the effects that warming-induced increases in shrub abundance and changing seasonality have on migratory songbirds in Alaskan Arctic tundra Identify and characterize interactions between shrub dominance and weather to determine how these affect food and shelter availability for migratory songbirds

polarfield.com/blog/plants-bugs-migratory- songbirds /

Arctic Birds <

Seek to determine how reproductive success of populations of two songbirds species respond to variation in both shrub dominance and timing of spring snowmelt Measure how these variations affect composition and size of the entire songbird community Secondary goal to develop techniques for monitoring bird community attributes via bioacoustic recordings for conducting automated bird community censuses

Arctic Food Web

AMS Earth’s Climate System

Climate Change Report report/ar4/syr/ar4_syr_spm.pdf report/ar4/syr/ar4_syr_spm.pdf Observed changes in climate and their effects 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

Observational evidence from all continents and most oceans shows that many natural systems are being affected by regional climate changes, particularly temperature increases.

Causes of Change Global GHG emissions due to human activities have grown since pre-industrial times, with an increase of 70% between 1970 and 2004 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 global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic GHG concentrations. It is likely that there has been significant anthropogenic warming over the past 50 years averaged over each continent (except Antarctica)

Projected climate change and its impacts There is high agreement and much evidence that with current climate change mitigation policies and related sustainable development practices, global GHG emissions will continue to grow over the next few decades. Continued GHG emissions at or above current rates would cause further warming and induce many changes in the global climate system during the 21st century that would very likely be larger than those observed during the 20th century