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GCM simulations of the Indian Ocean dipole influence on East African rainfall: present and future.

GCM simulations of the Indian Ocean dipole influence on East African rainfall: present and future.
GCM simulations of the Indian Ocean dipole influence on East African rainfall: present and future.
Six coupled GCMs are assessed in terms of their ability to simulate observed characteristics of East African rainfall, the Indian Ocean dipole and their temporal correlation. Model results are then used to analyze the future behaviour of rainfall and the DMI. All models simulate reasonably well the spatial distribution and variability of annual and seasonal rainfall over the 1961–1990 period. Model simulation of observed DMI characteristics is less consistent with observations, however, five models reproduce similar correlations to those observed between the DMI and East African short rains (SON). In the future, there are no clear inter-model patterns of rainfall or DMI behaviour. In this sample of models four (two) out of six simulate modest increases (decreases) in annual rainfall by the 2080s. For SON, three of the six models indicate a trend towards increasingly positive phase of the DMI, two indicate a decrease and one shows no substantial change.
gcm, iod, east african rainfall
0094-8276
Conway, D.
04897f0e-0050-4d6a-baf1-62dfa6b848ba
Hanson, C.E.
6da0ee24-9934-4ddb-975e-2c5f8b7f243a
Doherty, R.
beb5503d-2436-4f6b-8505-27a0acad9bcd
Persechino, A.
516687cb-440c-4cc3-91e9-21233b28ae04
Conway, D.
04897f0e-0050-4d6a-baf1-62dfa6b848ba
Hanson, C.E.
6da0ee24-9934-4ddb-975e-2c5f8b7f243a
Doherty, R.
beb5503d-2436-4f6b-8505-27a0acad9bcd
Persechino, A.
516687cb-440c-4cc3-91e9-21233b28ae04

Conway, D., Hanson, C.E., Doherty, R. and Persechino, A. (2007) GCM simulations of the Indian Ocean dipole influence on East African rainfall: present and future. Geophysical Research Letters, 34 (L03705). (doi:10.1029/2006GL027597).

Record type: Article

Abstract

Six coupled GCMs are assessed in terms of their ability to simulate observed characteristics of East African rainfall, the Indian Ocean dipole and their temporal correlation. Model results are then used to analyze the future behaviour of rainfall and the DMI. All models simulate reasonably well the spatial distribution and variability of annual and seasonal rainfall over the 1961–1990 period. Model simulation of observed DMI characteristics is less consistent with observations, however, five models reproduce similar correlations to those observed between the DMI and East African short rains (SON). In the future, there are no clear inter-model patterns of rainfall or DMI behaviour. In this sample of models four (two) out of six simulate modest increases (decreases) in annual rainfall by the 2080s. For SON, three of the six models indicate a trend towards increasingly positive phase of the DMI, two indicate a decrease and one shows no substantial change.

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More information

Published date: 9 February 2007
Keywords: gcm, iod, east african rainfall

Identifiers

Local EPrints ID: 66756
URI: https://eprints.soton.ac.uk/id/eprint/66756
ISSN: 0094-8276
PURE UUID: 0213bfa1-d7af-416a-b507-b9550ca62890

Catalogue record

Date deposited: 16 Jul 2009
Last modified: 19 Jul 2017 00:22

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