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Circulation patterns associated with trends in summer temperature variability patterns in North America.
Chibuike Chiedozie Ibebuchi1,2, Cameron C Lee3,4
1Department of Geography, Kent State University, Kent, OH, USA. cibebuch@kent.edu.
Scientific Reports
|August 2, 2023
Summary
North American summer temperatures are warming due to circulation changes, linked to global warming and Arctic sea ice loss. These shifts influence regional temperature trends and extreme weather events.
Area of Science:
- Climatology
- Atmospheric Science
- Meteorology
Background:
- Regional temperature trends are influenced by complex circulation patterns.
- Understanding these patterns is crucial for climate change adaptation and mitigation.
Purpose of the Study:
- To characterize boreal summer temperature variability in North America.
- To link temperature trends with atmospheric circulation anomalies.
- To investigate the influence of global warming on regional climate patterns.
Main Methods:
- Rotated S-mode principal component analysis (PCA) applied to observational and reanalysis temperature datasets (1979-2022).
- Analysis of gridded 2-m temperature data and ERA5 reanalysis data.
- Correlation analysis between circulation patterns and temperature variability.
Main Results:
- Significant trends in temperature variability patterns observed from 1979-2022 summers.
- Anticyclonic circulation anomalies linked to increased temperatures in Greenland, northeastern Canada, and Alaska.
- Cyclonic circulation over the northeast Pacific coast associated with warming in northwestern North America.
- Increased global temperatures correlate with enhanced circulation amplitudes in warm regimes.
- Arctic Oscillation's negative phase linked to Greenland/northeastern Canada warming.
- Enhanced Arctic anticyclonic circulation explains 68% of sea ice reduction.
Conclusions:
- Global warming and Pacific Ocean warming modulate circulation patterns, increasing warm regimes in North America.
- These circulation shifts significantly impact regional temperatures and contribute to Arctic sea ice decline.
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