Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States
This observational study investigates statistical and synoptic–dynamic relationships between regime transitions, defined as a North Atlantic Oscillation (NAO) or Pacific–North American pattern (PNA) index change from at least a 1 standard deviation anomaly to at least a 1 standard deviation anomaly...
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ftunivalbany:oai:scholarsarchive.library.albany.edu:cas_daes_scholar-1018 2023-05-15T17:31:08+02:00 Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States Keyser, Daniel Archambault, Heather M. Bosart, Lance F. 2010-09-01T07:00:00Z https://scholarsarchive.library.albany.edu/cas_daes_scholar/11 https://doi.org/10.1175/2010MWR3362.1 unknown Scholars Archive https://scholarsarchive.library.albany.edu/cas_daes_scholar/11 https://doi.org/10.1175/2010MWR3362.1 Atmospheric and Environmental Science Faculty Scholarship text 2010 ftunivalbany https://doi.org/10.1175/2010MWR3362.1 2022-03-03T18:48:31Z This observational study investigates statistical and synoptic–dynamic relationships between regime transitions, defined as a North Atlantic Oscillation (NAO) or Pacific–North American pattern (PNA) index change from at least a 1 standard deviation anomaly to at least a 1 standard deviation anomaly of opposite sign within 7 days, and cool-season (November–April) northeastern U.S. (NE) precipitation. A statistical analysis is performed of daily cool-season NE precipitation during all NAO and PNA transitions for 1948–2003, and a composite analysis and case study of a major cool-season NE precipitation event occurring during a positive-to-negative NAO transition are conducted. Datasets used are the 0.25° NCEP Unified Precipitation Dataset, the 2.5° NCEP–NCAR reanalysis, and the 1.125° 40-yr ECMWF Re-Analysis (ERA-40). Results of the statistical analysis suggest that cool-season NE precipitation tends to be enhanced during positive-to-negative NAO and negative-to-positive PNA transitions, and suppressed during negative-to-positive NAO and positive-to-negative PNA transitions. Of the four types of regime transitions, only the positive-to-negative NAO transition is associated with substantially more frequent major cool-season NE precipitation events compared to climatology. Results of the composite analysis and case study indicate that a surface cyclone and cyclonic wave breaking associated with the major NE precipitation event can help produce a high-latitude blocking pattern over the North Atlantic characteristic of a negative NAO pattern via thermal advection, potential vorticity transport, and diabatic processes. Text North Atlantic North Atlantic oscillation University at Albany, State University of New York (SUNY): Scholars Archive Pacific Monthly Weather Review 138 9 3454 3473 |
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University at Albany, State University of New York (SUNY): Scholars Archive |
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This observational study investigates statistical and synoptic–dynamic relationships between regime transitions, defined as a North Atlantic Oscillation (NAO) or Pacific–North American pattern (PNA) index change from at least a 1 standard deviation anomaly to at least a 1 standard deviation anomaly of opposite sign within 7 days, and cool-season (November–April) northeastern U.S. (NE) precipitation. A statistical analysis is performed of daily cool-season NE precipitation during all NAO and PNA transitions for 1948–2003, and a composite analysis and case study of a major cool-season NE precipitation event occurring during a positive-to-negative NAO transition are conducted. Datasets used are the 0.25° NCEP Unified Precipitation Dataset, the 2.5° NCEP–NCAR reanalysis, and the 1.125° 40-yr ECMWF Re-Analysis (ERA-40). Results of the statistical analysis suggest that cool-season NE precipitation tends to be enhanced during positive-to-negative NAO and negative-to-positive PNA transitions, and suppressed during negative-to-positive NAO and positive-to-negative PNA transitions. Of the four types of regime transitions, only the positive-to-negative NAO transition is associated with substantially more frequent major cool-season NE precipitation events compared to climatology. Results of the composite analysis and case study indicate that a surface cyclone and cyclonic wave breaking associated with the major NE precipitation event can help produce a high-latitude blocking pattern over the North Atlantic characteristic of a negative NAO pattern via thermal advection, potential vorticity transport, and diabatic processes. |
format |
Text |
author |
Keyser, Daniel Archambault, Heather M. Bosart, Lance F. |
spellingShingle |
Keyser, Daniel Archambault, Heather M. Bosart, Lance F. Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States |
author_facet |
Keyser, Daniel Archambault, Heather M. Bosart, Lance F. |
author_sort |
Keyser, Daniel |
title |
Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States |
title_short |
Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States |
title_full |
Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States |
title_fullStr |
Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States |
title_full_unstemmed |
Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States |
title_sort |
relationships between large-scale regime transitions and major cool-season precipitation events in the northeastern united states |
publisher |
Scholars Archive |
publishDate |
2010 |
url |
https://scholarsarchive.library.albany.edu/cas_daes_scholar/11 https://doi.org/10.1175/2010MWR3362.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Atmospheric and Environmental Science Faculty Scholarship |
op_relation |
https://scholarsarchive.library.albany.edu/cas_daes_scholar/11 https://doi.org/10.1175/2010MWR3362.1 |
op_doi |
https://doi.org/10.1175/2010MWR3362.1 |
container_title |
Monthly Weather Review |
container_volume |
138 |
container_issue |
9 |
container_start_page |
3454 |
op_container_end_page |
3473 |
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1766128472598511616 |