Monthly ENSO Precipitation Index (ESPI)
Entry ID: NOAA_NWS_CPC_ESPI

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Summary
Abstract: [Text Source: Curtis, S. and R. Adler, 2000: ENSO indexes based on patterns of satellite-derived precipitation. J. Climate, 13, 2786-2793 and http://trmm.gsfc.nasa.gov/ESPIsummary.html ]

A summary of the GPCP precipitation-based ENSO indices (EI, LI, ESPI)

The goal in constructing a precipitation-based measure of ENSO was to estimate the gradient of rainfall anomalies across the Pacific basin and ensure a good relationship with SST- and pressure-based indices. Areas were selected that represent the Maritime Continent (MC) (10° N – 10°S; 90° E – 150° E) and central to eastern Pacific (P) (10° N – 10° S; 160° E – 100° W). These regions capture the largest precipitation anomalies associated with the interannual variations of the Walker circulation and contain the largest correlations between GPCP and Nino 3.4 and SOI. Within P and MC the absolute magnitude of the largest correlation is over +0.6.

Because of the spatially varying nature of rainfall, it was decided to use a moving block average which would capture the strongest zonal gradients within the equatorial Pacific. This procedure is unlike many fixed area average indices, and allows for a realistic meridional component of the precipitation gradient and migration of the ascending and descending branches of the Walker circulation.

Additional Information: http://trmm.gsfc.nasa.gov/ESPIsummary.html

Related URL
Link: GET DATA
Description: Access to monthly ESPI Precipitation index since 1979


Link: GET DATA
Description: Access to monthly ESPI, LI and EI indices


Link: GET DATA
Description: ESPI rainfall anomalies and graphics


Link: VIEW RELATED INFORMATION
Description: Documentation on how indices were derived


Geographic Coverage
 N: 10.0 S: -10.0  E: 150.0  W: 90.0
 N: 10.0 S: -10.0  E: -100.0  W: 160.0

Data Set Citation
Dataset Originator/Creator: Curtis, S. and R. Adler
Dataset Title: ENSO Precipitation Index (ESPI)
Dataset Release Date: ongoing
Dataset Release Place: Greenbelt, MD, USA
Dataset Publisher: NASA TRMM Project Office
Online Resource: http://trmm.gsfc.nasa.gov/ESPIsummary.html


Temporal Coverage
Start Date: 1979-01-01


Location Keywords
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > TROPICS


Data Resolution
Temporal Resolution: monthly


Science Keywords
ATMOSPHERE >PRECIPITATION >PRECIPITATION AMOUNT    [Definition]
ATMOSPHERE >PRECIPITATION >PRECIPITATION ANOMALIES    [Definition]
ATMOSPHERE >PRECIPITATION >PRECIPITATION RATE    [Definition]
ATMOSPHERE >PRECIPITATION >RAIN    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >EL NINO SOUTHERN OSCILLATION (ENSO)    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >PRECIPITATION INDICES >ENSO PRECIPITATION INDEX    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
TRMM >Tropical Rainfall Measuring Mission    [Information]


Instrument
PR >TRMM Precipitation Radar    [Information]


Keywords
ENSO Precipitation Index
ESPI
rainfall anomalies
El Nino
La Nina
climate index
climate indices
climate change


Data Set Progress
IN WORK


Originating Center
NASA/GSFC


Data Center
Tropical Rainfall Measuring Mission, Mesoscale Atmospheric Processes, Laboratory for Atmospheres, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://trmm.gsfc.nasa.gov/

Data Center Personnel
Name: SCOTT, DR. BRAUN
Phone: 301-614-6316
Email: Scott.A.Braun at nasa.gov
Contact Address:
TRMM Project Scientist
NASA Goddard Space Flight Center
8800 Greenbelt Road
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Physical Sciences Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.esrl.noaa.gov/psd/
Dataset ID: ESPI Index

Data Center Personnel
Name: ESRL/PSD DATA INQUIRIES
Email: esrl.psd.data at noaa.gov



Distribution
Distribution_Media: online www
Distribution_Format: ascii
Fees: none


Personnel
SCOTT, DR. BRAUN
Role: TECHNICAL CONTACT
Phone: 301-614-6316
Email: Scott.A.Braun at nasa.gov
Contact Address:
TRMM Project Scientist
NASA Goddard Space Flight Center
8800 Greenbelt Road
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


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
Curtis, S. and R. Adler (2000), ENSO indexes based on patterns of satellite-derived precipitation, J. Climate, 13, 2786-2793

Creation and Review Dates
DIF Creation Date: 2005-12-15
Last DIF Revision Date: 2011-04-06

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