Ó Springer-Verlag 2006
Abstract Synoptic extra-tropical cyclone and anticyclone trajectories have been constructed from mean daily sea level pressure (SLP) data using a new automated scheme. Frequency, intensity and trajectory characteristics of these transients have been summarized to form indices describing wintertime c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.401.4446 2023-05-15T13:15:00+02:00 Ó Springer-Verlag 2006 Alice Favre Æ Alexander Gershunov A. Favre A. Gershunov The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.401.4446 http://meteora.ucsd.edu/cnap/pdffiles/Favre_Gershunov_cd_2006.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.401.4446 http://meteora.ucsd.edu/cnap/pdffiles/Favre_Gershunov_cd_2006.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://meteora.ucsd.edu/cnap/pdffiles/Favre_Gershunov_cd_2006.pdf text 2005 ftciteseerx 2016-01-08T02:49:59Z Abstract Synoptic extra-tropical cyclone and anticyclone trajectories have been constructed from mean daily sea level pressure (SLP) data using a new automated scheme. Frequency, intensity and trajectory characteristics of these transients have been summarized to form indices describing wintertime cyclonic and anticyclonic activity over the North-Eastern Pacific (east of 170°W) during 1950–2001. During this period, the strength of anticyclones gradually diminished and their frequency became more variable, while cyclones intensified in a discrete shift with deeper lows and further southerly trajectories occurring since the mid-1970s. These changes in synoptic transients translate into anomalously low seasonal mean SLP in the Aleutian Low, a low-level circulation anomaly consistent with the positive phase of the North Pacific Decadal Oscillation, with positive sea surface temperature (SST) anomalies along the west coast of North America and negative in the central North Pacific Ocean. A link between cyclonic/anticyclonic activity and tropical SST anomalies also exists, but this link only becomes significant after the mid-1970s, a period that coincides with more southerly cyclone trajectories. Southward excursions of mid-latitude cyclones during El Nin ˜ o/positive NPO winters accomplish the northward advection of tropical air and discourage the southward penetration of polar air masses associated with transient anticyclones. Naturally, these changes in cyclonic/anticyclonic activity directly impact surface air temperatures, especially at night. We document these profound impacts on observed wintertime minimum temperatures over Western North America. 1 Text aleutian low Unknown Pacific |
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Abstract Synoptic extra-tropical cyclone and anticyclone trajectories have been constructed from mean daily sea level pressure (SLP) data using a new automated scheme. Frequency, intensity and trajectory characteristics of these transients have been summarized to form indices describing wintertime cyclonic and anticyclonic activity over the North-Eastern Pacific (east of 170°W) during 1950–2001. During this period, the strength of anticyclones gradually diminished and their frequency became more variable, while cyclones intensified in a discrete shift with deeper lows and further southerly trajectories occurring since the mid-1970s. These changes in synoptic transients translate into anomalously low seasonal mean SLP in the Aleutian Low, a low-level circulation anomaly consistent with the positive phase of the North Pacific Decadal Oscillation, with positive sea surface temperature (SST) anomalies along the west coast of North America and negative in the central North Pacific Ocean. A link between cyclonic/anticyclonic activity and tropical SST anomalies also exists, but this link only becomes significant after the mid-1970s, a period that coincides with more southerly cyclone trajectories. Southward excursions of mid-latitude cyclones during El Nin ˜ o/positive NPO winters accomplish the northward advection of tropical air and discourage the southward penetration of polar air masses associated with transient anticyclones. Naturally, these changes in cyclonic/anticyclonic activity directly impact surface air temperatures, especially at night. We document these profound impacts on observed wintertime minimum temperatures over Western North America. 1 |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Alice Favre Æ Alexander Gershunov A. Favre A. Gershunov |
spellingShingle |
Alice Favre Æ Alexander Gershunov A. Favre A. Gershunov Ó Springer-Verlag 2006 |
author_facet |
Alice Favre Æ Alexander Gershunov A. Favre A. Gershunov |
author_sort |
Alice Favre |
title |
Ó Springer-Verlag 2006 |
title_short |
Ó Springer-Verlag 2006 |
title_full |
Ó Springer-Verlag 2006 |
title_fullStr |
Ó Springer-Verlag 2006 |
title_full_unstemmed |
Ó Springer-Verlag 2006 |
title_sort |
ó springer-verlag 2006 |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.401.4446 http://meteora.ucsd.edu/cnap/pdffiles/Favre_Gershunov_cd_2006.pdf |
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Pacific |
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Pacific |
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aleutian low |
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aleutian low |
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http://meteora.ucsd.edu/cnap/pdffiles/Favre_Gershunov_cd_2006.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.401.4446 http://meteora.ucsd.edu/cnap/pdffiles/Favre_Gershunov_cd_2006.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766266503967014912 |