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- Energie-, Verkehrs- und Klimapolitik (90) (remove)
Global climate
(2008)
Die CDM/JI-Initiative des BMU : für mehr Engagement in internationalen Klimaschutzinvestitionen
(2008)
Proposals for contributions of emerging economies to the climate regime under the UNFCCC post 2012
(2008)
Under the principle of "common but differentiated responsibilities” (Article 3.1 of the UNFCCC) non-Annex I parties have so far been exempted from emission limitation or reduction commitments. However, the pressure is mounting on those countries, especially major emitting developing countries, to contribute actively to the mitigation of climate change. Participation by these developing countries in a future international climate regime is often called for, but it is usually unclear how and how much these countries should participate, what kind of support they need and in which sectors. This project aims to provide a more detailed view on six countries to understand how they could best make a contribution to the regime and how they could best be supported in limiting their greenhouse gas emissions.
The sensitivity of climate phenomena in the low latitudes to enhanced greenhouse conditions is a scientific issue of high relevance to billions of people in the poorest countries of the globe. So far, most studies dealt with individual model results. In the present analysis, we refer to 79 coupled ocean–atmosphere simulations from 12 different climate models under 6 different IPCC scenarios. The basic question is as to what extent various state-of-the-art climate models agree in predicting changes in the main features of El Niño-Southern Oscillation (ENSO) and the monsoon climates in South Asia and West Africa. The individual model runs are compared with observational data in order to judge whether the spatio-temporal characteristics of ENSO are well reproduced. The model experiments can be grouped into multi-model ensembles. Thus, climate change signals in the classical index time series, in the principal components and in the time series of interannual variability can be evaluated against the background of internal variability and model uncertainty.
There are large differences between the individual model predictions until the end of the 21st century, especially in terms of monsoon rainfall and the Southern Oscillation index (SOI). The majority of the models tends to project La Niña-like anomalies in the SOI and an intensification of the summer monsoon precipitation in India and West Africa. However, the response barely exceeds the level of natural variability and the systematic intermodel variations are larger than the impact of different IPCC scenarios. Nonetheless, there is one prominent climate change signal, which stands out from model variations and internal noise: All forced model experiments agree in predicting a substantial warming in the eastern tropical Pacific. This oceanic heating does not necessarily lead to a modification of ENSO towards more frequent El Niño and/or La Niña events. It simply represents a change in the background state of ENSO. Indeed, we did not find convincing multi-model evidence for a modification of the wavelet spectra in terms of ENSO or the monsoons. Some models suggest an intensification of the annual cycle but this signal is fairly model-dependent. Thus, large model uncertainty still exists with respect to the future behaviour of climate in the low latitudes. This has to be taken into account when addressing climate change signals in individual model experiments and ensembles.