Pacific-North America (PNA) Pattern

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NOAA/NWS/CPC
Publication_Date: ongoing
Title: Pacific-North America (PNA) Pattern
Edition:
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name: NOAA/NWS/CPC Indices and Forecasts
Issue_Identification:
Publication_Information:
Publication_Place: Camp Springs, MD
Publisher: NOAA National Weather Service, Center for Climate Prediction
Other_Citation_Details:
Online_Linkage: http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/pna_index.html
Description:
Abstract:
[Source: NOAA Climate Prediction Center, http://www.cpc.ncep.noaa.gov/ ] The daily Pacific-North America Patter (PNA) index is constructed by properly projecting the daily (00Z) 500mb height anomalies over the Northern Hemsiphere onto the loading pattern of the PNA. The daily PNA index and its forecasts using MRF and Ensemble mean forecast data are available for the previous 120 days and they are normalized by standard deviation of the monthly PNA index from 1950 to 2000. A 3-day running mean is applied for the forecast indices. Monthly and seasonal mean (JFM) PNA Index data are also available. See: http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/pna_index.html The PNA pattern is one of the most prominent modes of low-frequency variability in the Northern Hemisphere extratropics, appearing in all months except June and July. The PNA pattern reflects a quadripole pattern of height anomalies, with anomalies of similar sign located south of the Aleutian Islands and over the southeastern United States. Anomalies with sign opposite to the Aleutian center are located in the vicinity of Hawaii, and over the intermountain region of North America (central Canada) during the Winter and Fall (Spring). The spatial scale of the PNA pattern is most expansive in Winter. During this period, the Aleutian center spans most of the northern latitudes of the North Pacific. In Spring, the Aleutian center contracts and becomes confined primarily to the Gulf of Alaska. However, the subtropical center near Hawaii reaches maximum amplitude during the spring. The PNA pattern then disappears during June and July, but reappears in the late summer and fall. During this period, the midlatitude centers become dominant and appear as a wave pattern emanating from the eastern North Pacific. The subtropical center near Hawaii is weakest during this period. The time series of the PNA pattern also indicates substantial interseasonal, interannual and interdecadal variability. For example, a negative phase of the pattern dominated the period from 1964-1967, while a positive phase of the pattern tended to dominate from 1976-1988. A negative phase of the PNA then dominated during the 1989-1990 period, followed by a prolonged positive phase from fall 1991- early spring 1993. For additional information on the PNA, see: http://www.cpc.ncep.noaa.gov/data/teledoc/pna.shtml
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19500101
Ending_Date: Unknown
Currentness_Reference:Unknown
Status:
Progress: In Work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: 180.0
North_Bounding_Coordinate: 90.0
South_Bounding_Coordinate: 10.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ALTITUDE > GEOPOTENTIAL HEIGHT
Theme_Keyword: EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > PACIFIC/NORTH AMERICAN (PNA) PATTERN > PNA
Theme_Keyword: Pna
Theme_Keyword: Pacific-north America Index
Theme_Keyword: Climate Index
Theme_Keyword: Climate Indices
Theme_Keyword: Forecast Indices
Theme_Keyword: Atmospheric Circulation
Theme_Keyword: Climate Change
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
Place_Keyword: OCEAN > PACIFIC OCEAN
Place_Keyword: CONTINENT > NORTH AMERICA
Place_Keyword: GEOGRAPHIC REGION > NORTHERN HEMISPHERE
Temporal:
Temporal_Keyword_Thesaurus: GCMD
Temporal_Keyword: Daily, Monthly, Seasonal
Access_Constraints: Not Available
Use_Constraints:
Not Available
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DOC/NOAA/NWS/NCEP/CPC > Climate Prediction Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce
Contact_Person: ED O'LENIC
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Contact_Electronic_Mail_Address: Ed.Olenic@noaa.gov
Resource_Description: PNA
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ascii
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.cpc.ncep.noaa.gov/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.cpc.ncep.noaa.gov/products/precip/CWlin...
Access_Instructions:
Access to PNA documentation, graphics, and data
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.cpc.ncep.noaa.gov/products/precip/CWlin...
Access_Instructions:
Access to PNA monthly mean data since 1950.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.cpc.ncep.noaa.gov/data/teledoc/pna.shtm...
Access_Instructions:
Access to PNA documentation, graphs and data
Fees: None
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Metadata_Reference_Information:
Metadata_Date: 20030211
Metadata_Review_Date: 20091104
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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