Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes
Abstract Recent years have witnessed extreme heatwaves in Europe and western North America. This study shows that these regions stand out in the zonally asymmetric component of the long-term trend of boreal summer surface temperature, and that intraseasonal timescale processes play an important role...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-11-01
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| Series: | npj Climate and Atmospheric Science |
| Online Access: | https://doi.org/10.1038/s41612-023-00522-z |
| _version_ | 1827635049340600320 |
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| author | Dong Wan Kim Sukyoung Lee Joseph P. Clark Steven B. Feldstein |
| author_facet | Dong Wan Kim Sukyoung Lee Joseph P. Clark Steven B. Feldstein |
| author_sort | Dong Wan Kim |
| collection | DOAJ |
| description | Abstract Recent years have witnessed extreme heatwaves in Europe and western North America. This study shows that these regions stand out in the zonally asymmetric component of the long-term trend of boreal summer surface temperature, and that intraseasonal timescale processes play an important role in shaping the zonally asymmetric trend pattern. However, these two regions have warmed by different mechanisms. Over Europe, the warming is mostly caused by the positive trend of the net (downward minus upward) surface shortwave radiation weighted by its intraseasonal timescale connection with the skin temperature. The long-term warming in western North America has been caused by the declining surface latent heat flux (weakened evaporative cooling) weighted by its intraseasonal connection with the skin temperature. These mechanisms are consistent with those identified in earlier studies of individual extreme events in the two regions, indicating that part of the long trends are a manifestation of extreme events. The overall findings indicate that to make accurate projections of regional climate change using climate model simulations, it is critical to ensure that the models also accurately simulate intraseasonal variability. |
| first_indexed | 2024-03-09T15:22:47Z |
| format | Article |
| id | doaj.art-c886557a82104e58bba6814da762c34b |
| institution | Directory Open Access Journal |
| issn | 2397-3722 |
| language | English |
| last_indexed | 2024-03-09T15:22:47Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Climate and Atmospheric Science |
| spelling | doaj.art-c886557a82104e58bba6814da762c34b2023-11-26T12:45:00ZengNature Portfolionpj Climate and Atmospheric Science2397-37222023-11-01611710.1038/s41612-023-00522-zZonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processesDong Wan Kim0Sukyoung Lee1Joseph P. Clark2Steven B. Feldstein3Department of Meteorology and Atmospheric Science, The Pennsylvania State UniversityDepartment of Meteorology and Atmospheric Science, The Pennsylvania State UniversityProgram in Atmospheric and Oceanic Sciences, Princeton UniversityDepartment of Meteorology and Atmospheric Science, The Pennsylvania State UniversityAbstract Recent years have witnessed extreme heatwaves in Europe and western North America. This study shows that these regions stand out in the zonally asymmetric component of the long-term trend of boreal summer surface temperature, and that intraseasonal timescale processes play an important role in shaping the zonally asymmetric trend pattern. However, these two regions have warmed by different mechanisms. Over Europe, the warming is mostly caused by the positive trend of the net (downward minus upward) surface shortwave radiation weighted by its intraseasonal timescale connection with the skin temperature. The long-term warming in western North America has been caused by the declining surface latent heat flux (weakened evaporative cooling) weighted by its intraseasonal connection with the skin temperature. These mechanisms are consistent with those identified in earlier studies of individual extreme events in the two regions, indicating that part of the long trends are a manifestation of extreme events. The overall findings indicate that to make accurate projections of regional climate change using climate model simulations, it is critical to ensure that the models also accurately simulate intraseasonal variability.https://doi.org/10.1038/s41612-023-00522-z |
| spellingShingle | Dong Wan Kim Sukyoung Lee Joseph P. Clark Steven B. Feldstein Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes npj Climate and Atmospheric Science |
| title | Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes |
| title_full | Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes |
| title_fullStr | Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes |
| title_full_unstemmed | Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes |
| title_short | Zonally asymmetric component of summer surface temperature trends caused by intraseasonal time-scale processes |
| title_sort | zonally asymmetric component of summer surface temperature trends caused by intraseasonal time scale processes |
| url | https://doi.org/10.1038/s41612-023-00522-z |
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