Spatio-temporal evolution of global surface temperature distributions
Abstract
Climate is known for being characterised by strong non-linearity and chaotic behaviour. Nevertheless, few studies in climate science adopt statistical methods specifically designed for non-stationary or non-linear systems. Here we show how the use of statistical methods from Information Theory can describe the non-stationary behaviour of climate fields, unveiling spatial and temporal patterns that may otherwise be difficult to recognize. We study the maximum temperature at two meters above ground using the NCEP CDAS1 daily reanalysis data, with a spatial resolution of 2.5° by 2.5° and covering the time period from 1 January 1948 to 30 November 2018. The spatial and temporal evolution of the temperature time series are retrieved using the Fisher Information Measure, which quantifies the information in a signal, and the Shannon Entropy Power, which is a measure of its uncertainty — or unpredictability. The results describe the temporal behaviour of the analysed variable. Our findings suggest that tropical and temperate zones are now characterized by higher levels of entropy. Finally, Fisher-Shannon Complexity is introduced and applied to study the evolution of the daily maximum surface temperature distributions.
Additional Information
© 2020 Copyright held by the owner/author(s). The research presented in this paper was partly supported by the National Research Program 75 "Big Data" (PNR75, project No. 167285 "HyEnergy") of the Swiss National Science Foundation (SNSF). V.H. is supported by the SNSF grant no. P400P2_180784.Attached Files
Published - 3429309.3429315.pdf
Accepted Version - 2006.12386.pdf
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Additional details
- Eprint ID
- 112441
- Resolver ID
- CaltechAUTHORS:20211214-82839000
- Swiss National Science Foundation (SNSF)
- 167285
- Swiss National Science Foundation (SNSF)
- P400P2_180784
- Created
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2021-12-15Created from EPrint's datestamp field
- Updated
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2022-02-01Created from EPrint's last_modified field