This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1088/2752-5295/ad574e. This is version 2 of this Preprint.
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Abstract
Global warming levels (GWLs) are increasingly becoming a central concept in climate change studies. In recent years, their integrative quality for climate change impact analysis has been demonstrated, and methodological advancements have helped to compensate for some inherent shortfalls of the concept. However, their applicability at the regional level is debatable, and no study to date has examined the possibility of linking local climate scenarios to GWLs. For the case of Austria, we have evaluated the relation between global and local warming patterns, and whether version changes of global climate models could be incorporated into local climate scenarios by means of the GWL concept, without updating the actual data. We applied the time sampling approach, where GWLs are determined as periods when global mean temperature anomalies cross a certain threshold. GWL periods were sampled both from the global models in the background of the local climate scenarios (CMIP5), and from an equivalent ensemble of newer-generation climate models (CMIP6). Uncertainties resulting from sampling GWLs from different global climate model ensembles were examined, and prospects for local climate change impact assessments were discussed. Accounting for updated global climate model versions might be useful when the changes at certain GWLs are related to fixed reference periods, but temperature increments between GWLs remained relatively constant across model versions, even on the local level. The study bridges a significant gap to link regional and local climate projections to GWLs. Climate change impacts assessments that build on those datasets can benefit from the integrative character of GWLs, making studies comparable across multiple disciplines and model versions, and thus fostering a way to communicate local climate change impacts more comprehensible.
DOI
https://doi.org/10.31223/X5NX10
Subjects
Climate, Environmental Indicators and Impact Assessment, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Keywords
global warming levels, CMIP5-CMIP6 comparison, local climate change impacts, regional climate variability, regional and local climate scenarios
Dates
Published: 2024-03-08 12:18
Last Updated: 2024-08-01 16:01
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License
CC BY Attribution 4.0 International
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Conflict of interest statement:
None
Data Availability (Reason not available):
All data used and processed for this article is publicly available. CMIP data portal: https://aims2.llnl.gov/search OEKS15 data hub: https://data.hub.geosphere.at/dataset/oks15_bias_corrected The historical climate dataset for Austria has been published under a Creative Commons Attribution 4.0 International licence on Zenodo: 10.5281/zenodo.10793154 The model list and processed data of the GCMs, i.e. GWL periods and regional temperature signals, can be found in supplementary table 1 in the appendix of the manuscript.
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