Northern and Southern Hemisphere Blocking Index from NOAA/Climate Prediction Center
Entry ID: NOAA_NWS_CPC_BLOCKING

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Summary
Abstract: [Source: NOAA Climate Prediction Center, http://www.cpc.ncep.noaa.gov/ ]

The blocking index of Tibaldi and Molteni (1990) was modified from that of Lejenas and Okland (1983). The index is local and instantaneous, ideally suited for real-time atmospheric monitoring, isolating regions of easterly flow at 500 hPa associated with high-latitude blocks.

This dataset uses the blocking index calculation for the northern hemisphere, however the index can be easily modified to examine blocking in the southern hemisphere. Blocking in the southern hemisphere typically occurs at lower latitudes when compared with the northern hemisphere. The index follows Tibaldi et al. (1994).

Related URL
Link: GET DATA
Description: Access to blocking index data, documentation, and graphs.


Geographic Coverage
 N: 90.0 S: 0.0  E: 180.0  W: -180.0
 Min Altitude: 0 HPA  Max Altitude: 500 HPA
 N: -0.0 S: -90.0  E: 180.0  W: -180.0
 Min Altitude: 0 HPA  Max Altitude: 500 HPA

Data Set Citation
Dataset Originator/Creator: Tibaldi, S., and F. Molteni
Dataset Title: Blocking Index
Dataset Series Name: NOAA/NWS/CPC Indices and Forecasts
Dataset Release Date: ongoing
Dataset Release Place: Camp Springs, MD
Dataset Publisher: NOAA National Weather Service, Center for Climate Prediction
Online Resource: http://www.cpc.ncep.noaa.gov/products/precip/CWlink/MJO/block.shtml


Temporal Coverage
Start Date: 2002-01-01


Location Keywords
GEOGRAPHIC REGION > NORTHERN HEMISPHERE
GEOGRAPHIC REGION > SOUTHERN HEMISPHERE


Data Resolution
Temporal Resolution: daily


Science Keywords
ATMOSPHERE >ALTITUDE >GEOPOTENTIAL HEIGHT    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >OSCILLATIONS >BLOCKING INDEX    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >PRESSURE ANOMALIES    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >BLOCKING INDEX    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Keywords
Blocking Index
climate index
climate indices
forecast indices
atmospheric circulation
atmospheric blocking
climate change
geopotential gradient height
GHGS
blocking strength


Data Set Progress
IN WORK


Originating Center
NOAA/NWS/CPC


Data Center
Climate Prediction Center, National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.cpc.ncep.noaa.gov/
Dataset ID: Blocking Index

Data Center Personnel
Name: ED O'LENIC
Email: Ed.Olenic at noaa.gov



Distribution
Distribution_Media: online www
Distribution_Format: ascii
Fees: none


Personnel
ED O'LENIC
Role: TECHNICAL CONTACT
Email: Ed.Olenic at noaa.gov


SCOTT A. RITZ
Role: DIF AUTHOR
Phone: 301-614-5126
Fax: 301-614-5268
Email: Scott.A.Ritz at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: Maryland
Postal Code: 20771
Country: USA


Publications/References
Lejenas, H., and H. Okland (1983), Characteristics of Northern Hemisphere blocking as determined from a long time series of observational data, Tellus, 35A, 350-362

Tibaldi, S., and F. Molten (1990), On the operational predictability of blocking, Tellus, 42A, 343-365

Tibaldi, S., E. Tosi, A. Navarra, and L. Pedulli (1994), Northern and Southern Hemisphere seasonal variability of blocking frequency and predictability, Monthly Weather Review, 122, 1971-2003

Creation and Review Dates
DIF Creation Date: 2003-02-11
Last DIF Revision Date: 2011-04-06

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