Atmospheric responses of Gill-type and Lindzen-Nigam models to global warming

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Abstract

The equatorial Pacific atmosphere responds differently to global warming in the Gill-type and Lindzen-Nigam models. Under an assumption of no change in the zonal sea surface temperature (SST) gradient in the Gill-type model, the Walker circulation is intensified in a warmer climate relative to current climatic conditions, while slightly weakened in the Lindzen-Nigam model. Furthermore, for more accurate derivation of the surface wind, the free atmosphere in the Gill-type model is combined with the atmospheric boundary layer. This modified Gill-type model actually produces weaker surface wind than the Gill-type model would, but the sensitivity of the Walker circulation to the warmer climate is similar to that obtained from the Gilltype model. These results may explain why the zonal gradient of equatorial Pacific SST during the twentieth century is observed to strengthen while the Walker circulation is not, even though they are dynamically linked.

Original languageEnglish
Pages (from-to)6165-6173
Number of pages9
JournalJournal of Climate
Volume24
Issue number23
DOIs
Publication statusPublished - 2011 Dec 1

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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