Tropical/Northern Hemisphere Teleconnection Pattern

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NOAA/NWS/CPC
Publication_Date: ongoing
Title: Tropical/Northern Hemisphere Teleconnection 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/data/teledoc/tnh.shtml
Description:
Abstract:
[Source: NOAA Climate Prediction Center, http://www.cpc.ncep.noaa.gov/ ] The Tropical/ Northern Hemisphere pattern was first classified by Mo and Livezey (1986), and appears as a prominent mode from November-February. The pattern consists of one primary anomaly center over the Gulf of Alaska and a separate anomaly center of opposite sign over the Hudson Bay. A weaker area of anomalies having similar sign to the Gulf of Alaska anomaly extends across Mexico and the extreme southeastern United States. This pattern reflects large-scale changes in both the location and eastward extent of the Pacific jet stream, and also in the strength and position of the climatological mean Hudson Bay Low. Thus, the pattern significantly modulates the flow of marine air into North America, as well as the southward transport of cold Canadian air into the north-central United States. Pronounced negative phases of the TNH pattern are often observed during December and January when Pacific warm (ENSO) episode conditions are present (Barnston et al. 1991). One recent example of this is the 1994/95 winter season, when mature Pacific warm episode conditions and a strong negative phase of the TNH pattern were present. During this period, the mean Hudson Bay trough was much weaker than normal and shifted northeastward toward the Labrador Sea. Additionally, the Pacific jet stream was much stronger than normal and shifted southward to central California, well south of its climatological mean position in the Pacific Northwest. This flow pattern brought well above-normal temperatures to eastern North America and above-normal rainfall to the southwestern United States. In contrast, positive phases of the TNH pattern tend to accompany Pacific cold events. An example is the very persistent positive phase of the TNH pattern during 1988/89 -1990/91, which developed in apparent association with the strong 1988/89 Pacific cold event.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Barnston, A.G., and R.E. Livezey, 1987: Classification, seasonality and persistence of low - frequency atmospheric circulation patterns. Mon. Wea. Rev., 115, 1083-1126. Barnston, A.G., R.E. Livezey, and M.S. Halpert, 1991. Modulation of Southern Oscillation-Northern Hemisphere mid-winter climate relationships by the QBO. J. of Climate. 4: 203-217. Mo, K. C., and R. E. Livezey, 1986: Tropical-extratropical geopotential height teleconnections during the Northern Hemisphere winter. Mon. Wea. Rev., 114, 2488-2515.
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: 0.0
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 > ATMOSPHERE > ATMOSPHERIC PRESSURE > OSCILLATIONS > TROPICAL/NORTHERN HEMISPHERE PATTERN
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > PRESSURE ANOMALIES
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS
Theme_Keyword: EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > EL NINO SOUTHERN OSCILLATION (ENSO)
Theme_Keyword: EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > QUASI-BIENNIAL OSCILLATION
Theme_Keyword: EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > TROPICAL/NORTHERN HEMISPHERE PATTERN
Theme_Keyword: Tropical/northern Hemisphere Pattern
Theme_Keyword: Tnh
Theme_Keyword: Climate Index
Theme_Keyword: Climate Indices
Theme_Keyword: Forecast Indices
Theme_Keyword: Atmospheric Circulation
Theme_Keyword: Climate Change
Theme_Keyword: Teleconnections
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > ATLANTIC OCEAN
Place_Keyword: OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA
Place_Keyword: OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
Place_Keyword: OCEAN > PACIFIC OCEAN
Place_Keyword: CONTINENT > NORTH AMERICA
Place_Keyword: GEOGRAPHIC REGION > NORTHERN HEMISPHERE
Place_Keyword: GEOGRAPHIC REGION > TROPICS
Temporal:
Temporal_Keyword_Thesaurus: GCMD
Temporal_Keyword: Daily, Monthly, Seasonal
Temporal_Keyword: Monthly - < Annual
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: SCOTT A. RITZ
Contact_Person_Primary:
Contact_Person: ED O'LENIC
Contact_Position: TECHNICAL CONTACT
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Global Change Master Directory
City: Greenbelt
State_or_Province: Maryland
Postal_Code: 20771
Country: USA
Contact_Address:
Address_Type: Mailing and Physical Address
Contact_Voice_Telephone: 301-614-5126
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: Scott.A.Ritz@nasa.gov
Contact_Electronic_Mail_Address: Ed.Olenic@noaa.gov
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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: Tropical/Northern Hemisphere Pattern
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/data/teledoc/tnh.shtm...
Access_Instructions:
Access to TNH documentation, graphs and data
Fees: None
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Metadata_Reference_Information:
Metadata_Date: 20030220
Metadata_Review_Date: 20091105
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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