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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 ? 10S; 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 >LIQUID 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


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: 2016-11-18

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