planetary scale weather regimes: enso (el niño southern oscillation): a global teleconnection,...
Post on 22-Dec-2015
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Planetary Scale Weather Regimes:
ENSO (El Niño Southern Oscillation): A global teleconnection, strongest in the Pacific, between the tropical oceans and the tropical and midlatitude atmosphere.
El Niño (warm phase of ENSO):
La Niña (cold phase of ENSO):
North Atlantic (or Arctic) Oscillation (NAO/AO): A teleconnection, strongest from eastern North America eastward to central Europe, between the extratropics and arctic.
Pacific-North American (PNA) Pattern: A teleconnection, strongest from the eastern Pacific eastward to the western Atlantic, between the tropical eastern Pacific and the extratropics.
Source: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensocycle/enso_cycle.html
Source: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensocycle/enso_cycle.html
Source: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensocycle/enso_cycle.html
Source: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensocycle/enso_cycle.html
El Niño Years La Niña Years
200 hPa Mean Winds (m s-1): Jan-Mar
El Niño Years La Niña Years
200 hPa Anomalous Winds (m s-1): Jan-Mar
El Niño La Niña
Source: http://www.cdc.noaa.gov/ENSO/enso.comp.html
Composite Wintertime ENSO Temperature over the US
El Niño La Niña
Source: http://www.cdc.noaa.gov/ENSO/enso.comp.html
Composite Wintertime ENSO Precipitation over the US
North Atlantic Oscillation (NAO)
Source: J. D'Aleo, Chief WSI/Intellicast Meteorologisthttp://www.nemas.net/hwu/longrange/nao.html
Source: http://www.ldeo.columbia.edu/NAO/
European Blocking (Warm): 3-6 Feb'04
European Blocking (Cold): Jan'63
European Fast Flow (Stormy): 23-27 Dec'99
Source: http://www.intellicast.com/DrDewpoint/Library/1372/
Source: http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/pna.shtml#current
Pacific-North American Pattern (PNA)
Pacific-North American (PNA) Pattern
PNA Positive PNA Negative
300 hPa Geopotential Heights (meters)
Jan 1981 Dec 1990
Pacific-North American (PNA) Pattern
PNA Positive PNA Negative
Jan 1981 Dec 1990
300 hPa Geopotential Height Anomalies (meters)