Quantifying changes in spatial patterns of surface air temperature dynamics over several decades
Contributor(s)Universitat Politècnica de Catalunya. Departament de Física
Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers
KeywordsÀrees temàtiques de la UPC::Física
We study daily surface air temperature (SAT) reanalysis in a grid over the Earth's surface to identify and quantify changes in SAT dynamics during the period 1979–2016. By analysing the Hilbert amplitude and frequency we identify the regions where relative variations are most pronounced (larger than ±50¿% for the amplitude and ±100¿% for the frequency). Amplitude variations are interpreted as due to changes in precipitation or ice melting
while frequency variations are interpreted as due to a northward shift of the inter-tropical convergence zone (ITCZ) and to a widening of the rainfall band in the western Pacific Ocean. The ITCZ is the ascending branch of the Hadley cell
and thus by affecting the tropical atmospheric circulation
ITCZ migration has far-reaching climatic consequences. As the methodology proposed here can be applied to many other geophysical time series
our work will stimulate new research that will advance the understanding of climate change impacts.
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Postprint (published version)
Zappala, D., Barreiro, M., Masoller, C. Quantifying changes in spatial patterns of surface air temperature dynamics over several decades. "Earth System Dynamics", 18 Abril 2018, vol. 9, núm. 2, p. 383-391.
Copyright/LicenseAttribution-NonCommercial-NoDerivs 3.0 Spain
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