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Regional amplification of projected changes in extreme temperatures strongly controlled by soil moisture‐temperature feedbacks
Author(s) -
Vogel M. M.,
Orth R.,
Cheruy F.,
Hagemann S.,
Lorenz R.,
Hurk B. J. J. M.,
Seneviratne S. I.
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl071235
Subject(s) - environmental science , water content , mean radiant temperature , moisture , climatology , global warming , climate change , global change , atmospheric sciences , global temperature , meteorology , geology , geography , oceanography , geotechnical engineering
Regional hot extremes are projected to increase more strongly than global mean temperature, with substantially larger changes than 2°C even if global warming is limited to this level. We investigate the role of soil moisture‐temperature feedbacks for this response based on multimodel experiments for the 21st century with either interactive or fixed (late 20th century mean seasonal cycle) soil moisture. We analyze changes in the hottest days in each year in both sets of experiments, relate them to the global mean temperature increase, and investigate processes leading to these changes. We find that soil moisture‐temperature feedbacks significantly contribute to the amplified warming of the hottest days compared to that of global mean temperature. This contribution reaches more than 70% in Central Europe and Central North America. Soil moisture trends are more important for this response than short‐term soil moisture variability. These results are relevant for reducing uncertainties in regional temperature projections.