Overview of ETCCDI & Production of NCMPs. ETCCDI CCL/CLIVAR/JCOMM-Expert Team (ET) on Climate Change Detection and Indices (ETCCDI) + its predecessor.

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Presentation transcript:

Overview of ETCCDI & Production of NCMPs

ETCCDI CCL/CLIVAR/JCOMM-Expert Team (ET) on Climate Change Detection and Indices (ETCCDI) + its predecessor CCL/CLIVAR WG on Climate Change Detection Coordinate international effort to develop, calculate and analyze indices which individual countries and regions can calculate in exactly the same way; Study the changes in the temperature and precipitation extremes. HOW? 1. develop a comprehensive list of indices meaningful over the globe 2.coordinate workshops for the preparation of climate change indices.

Last decade workshops Central and East Africa, Caribbean, South America, Middle East, Central, South Asia and South East Asia and South Pacific October organised by COI under ETCCDI Regional Meteorological Training and Research Centre for the Indian Ocean, Mauritius Meteorological Services (Experts– Lucie Vincent, Enric Aguilar) 2 Participants from the following countries: République des Comores, République de Madagascar, Republic of Mauritius, La Réunion (France) and Peoples Republic of Seychelles. [Citation: Vincent, L. A., et al. (2011), Observed trends in indices of daily and extreme temperature and precipitation for the countries of the western Indian Ocean, 1961–2008, J. Geophys. Res., 116, D10108, doi: /2010JD ]

Previous Wkshps

Data Participants brought digital long term ( ) daily maximum and minimum temperature and precipitation data The data period varied but sufficient (32 stations) to compute trends.

Methodology Monthly mean temperature and monthly total precipitation time series were examined for homogeneity using the software package RHTestsV3 (Environment Canada). Adjustments were applied to 9 and 10 stations (Tx & Tn) Rainfall data were not adjusted. For WIO, 13 temperature and 8 precipitation indices (on annual basis) were appropriate. Daily temperature and rainfall data were quality controlled using RClimDex (Environment Canada).

Indices definition (WIO)

Trends Trends in annual means of daily maximum temperature (TXMean) Trends in annual means of daily minimum temperature (TNMean)

Trends in extremes Sig. increase of 15 to 20% in the percentage of warm days ( TX90P ) and warm nights ( TN90P ) Sig. decrease of 10 to 15% in the percentage of cold days ( TX10P ) and cold nights ( TN10P ).

Decadal Pptn trends Annual precipitation has decreased by 2.76% per decade

Decadal trends in Pptn extremes

Production of NCMPs Host Regional Workshops with climate experts from NHMS Process standard long term daily data >30yrs (different countries) Use software packages  Increase understanding of regional Climate Change and strengthen regional cooperation on research  Ensure that NHMS maintain homogeneous climate data  Encourage the publication of Scientific Papers by participants