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Exploring recent trends in Northern Hemisphere blocking

TitleExploring recent trends in Northern Hemisphere blocking
Publication TypeManual Entry
Year of Publication2014
AuthorsBarnes, Elizabeth A., Etienne Dunn-Sigouin, Giacomo Masato, and Tim Woollings
Geophysical Research Letters
Arctic amplification, blocking, observed trends, sea ice loss

Observed blocking trends are diagnosed to test the hypothesis that recent Arctic warming and sea ice loss has increased the likelihood of blocking over the Northern Hemisphere. To ensure robust results, we diagnose blocking using three unique blocking identification methods from the literature, each applied to four different reanalyses. No clear hemispheric increase in blocking is found for any blocking index, and while seasonal increases and decreases are found for specific isolated regions and time periods, there is no instance where all three methods agree on a robust trend. Blocking is shown to exhibit large interannual and decadal variability, highlighting the difficulty in separating any potentially forced response from natural variability.

Citation Key2143


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