What caused the cool summer over northern Central Asia, East Asia and central North America during 2009?
Cool and wet weather conditions hit northern Central Asia, East Asia and central North America during the 2009 summer in concert with a strong jet stream and a prominent meandering upper-level circulation in the Northern Hemisphere mid-latitudes despite the fact that the year 2009 is the fifth warme...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2012-01-01
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| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/7/4/044015 |
| _version_ | 1797748472311447552 |
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| author | Kyung-Ja Ha Jung-Eun Chu June-Yi Lee Bin Wang Saji N Hameed Masahiro Watanabe |
| author_facet | Kyung-Ja Ha Jung-Eun Chu June-Yi Lee Bin Wang Saji N Hameed Masahiro Watanabe |
| author_sort | Kyung-Ja Ha |
| collection | DOAJ |
| description | Cool and wet weather conditions hit northern Central Asia, East Asia and central North America during the 2009 summer in concert with a strong jet stream and a prominent meandering upper-level circulation in the Northern Hemisphere mid-latitudes despite the fact that the year 2009 is the fifth warmest year globally in the modern record. It is found that the conspicuous atmospheric variability in the entire Northern Hemisphere mid-latitudes during the summer of 2009 was caused by a combination of teleconnections associated with significant tropical thermal forcings, strong polar forcing, and interaction between high-frequency weather events and climate anomalies. The strong negative circumglobal teleconnection pattern associated with the deficient Indian summer monsoon rainfall and developing El Niño condition was the major contributor to the cool and wet summer in June. On the other hand, the July weather conditions were attributable to the high-latitude impact of the unprecedented negative Arctic Oscillation, together with the Rossby wave response to the subtropical heating generated by convective activities over the Western North Pacific summer monsoon region. It is also noted that enhanced storm track activity and frequent cold surges from high-latitudes may have played a role in the cool and wet summer over the regions of interest. |
| first_indexed | 2024-03-12T16:05:17Z |
| format | Article |
| id | doaj.art-1cb1b4c5cdc74a5f82768a9a17edcec0 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T16:05:17Z |
| publishDate | 2012-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-1cb1b4c5cdc74a5f82768a9a17edcec02023-08-09T14:21:33ZengIOP PublishingEnvironmental Research Letters1748-93262012-01-017404401510.1088/1748-9326/7/4/044015What caused the cool summer over northern Central Asia, East Asia and central North America during 2009?Kyung-Ja Ha0Jung-Eun Chu1June-Yi Lee2Bin Wang3Saji N Hameed4Masahiro Watanabe5Division of Earth Environmental System, Pusan National University , Busan, KoreaDivision of Earth Environmental System, Pusan National University , Busan, KoreaDepartment of Meteorology and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii , Honolulu, USADepartment of Meteorology and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii , Honolulu, USACenter for Advanced Information Science and Technology, University of Aizu , JapanAtmosphere and Ocean Research Institute, University of Tokyo , JapanCool and wet weather conditions hit northern Central Asia, East Asia and central North America during the 2009 summer in concert with a strong jet stream and a prominent meandering upper-level circulation in the Northern Hemisphere mid-latitudes despite the fact that the year 2009 is the fifth warmest year globally in the modern record. It is found that the conspicuous atmospheric variability in the entire Northern Hemisphere mid-latitudes during the summer of 2009 was caused by a combination of teleconnections associated with significant tropical thermal forcings, strong polar forcing, and interaction between high-frequency weather events and climate anomalies. The strong negative circumglobal teleconnection pattern associated with the deficient Indian summer monsoon rainfall and developing El Niño condition was the major contributor to the cool and wet summer in June. On the other hand, the July weather conditions were attributable to the high-latitude impact of the unprecedented negative Arctic Oscillation, together with the Rossby wave response to the subtropical heating generated by convective activities over the Western North Pacific summer monsoon region. It is also noted that enhanced storm track activity and frequent cold surges from high-latitudes may have played a role in the cool and wet summer over the regions of interest.https://doi.org/10.1088/1748-9326/7/4/044015cool summeratmospheric variabilityEl Niñocircumglobal teleconnectionArctic oscillationIndian summer monsoon |
| spellingShingle | Kyung-Ja Ha Jung-Eun Chu June-Yi Lee Bin Wang Saji N Hameed Masahiro Watanabe What caused the cool summer over northern Central Asia, East Asia and central North America during 2009? Environmental Research Letters cool summer atmospheric variability El Niño circumglobal teleconnection Arctic oscillation Indian summer monsoon |
| title | What caused the cool summer over northern Central Asia, East Asia and central North America during 2009? |
| title_full | What caused the cool summer over northern Central Asia, East Asia and central North America during 2009? |
| title_fullStr | What caused the cool summer over northern Central Asia, East Asia and central North America during 2009? |
| title_full_unstemmed | What caused the cool summer over northern Central Asia, East Asia and central North America during 2009? |
| title_short | What caused the cool summer over northern Central Asia, East Asia and central North America during 2009? |
| title_sort | what caused the cool summer over northern central asia east asia and central north america during 2009 |
| topic | cool summer atmospheric variability El Niño circumglobal teleconnection Arctic oscillation Indian summer monsoon |
| url | https://doi.org/10.1088/1748-9326/7/4/044015 |
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