Association between recent U.S. northeast precipitation trends and Greenland blocking.
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| Title: | Association between recent U.S. northeast precipitation trends and Greenland blocking. |
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| Authors: | Simonson, Julia M.1,2,3 (AUTHOR) jmsimonson@alaska.edu, Birkel, Sean D.1,2 (AUTHOR), Maasch, Kirk A.1,2 (AUTHOR), Mayewski, Paul A.1,2 (AUTHOR), Lyon, Bradfield1,2 (AUTHOR), Carleton, Andrew M.4,5 (AUTHOR) |
| Source: | International Journal of Climatology. Sep2022, Vol. 42 Issue 11, p5682-5693. 12p. |
| Subject Terms: | *Rainfall, *Storms, Tropical cyclones, North Atlantic oscillation, Atmospheric models, Vertical motion |
| Geographic Terms: | Greenland |
| Abstract: | Since the early 2000s, the northeastern region of the United States (USNE) has received increased total annual precipitation along with more frequent extreme precipitation events. Although previous work has discussed the contribution to increased extreme precipitation from tropical cyclones, the large‐scale driver(s) of summer precipitation increases in the extratropics has received little attention. Here, we show that the summer‐season rainfall surpluses across the USNE are related to the increased frequency of atmospheric blocking over Greenland and the negative phase of the North Atlantic Oscillation. The occurrence of these patterns in summer has been previously connected with southward shifted storm tracks and wet conditions across the eastern North Atlantic. Over the USNE, the circulation shifts are also related to enhanced rainfall due to southerly wind anomalies and increased moisture transport into and vertical motion over the region. It is important to note that the current generation of climate models used for future projections is unable to reproduce the observed tendency towards increased atmospheric blocking over Greenland. Thus, clarifying the association between Greenland blocking and recent precipitation changes across the USNE may help inform future climate projections of summer season rainfall for the region. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Climatology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | GreenFILE |
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