PMID- 27418520 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20180216 LR - 20180216 IS - 1879-1026 (Electronic) IS - 0048-9697 (Linking) VI - 571 DP - 2016 Nov 15 TI - Global assessment of heat wave magnitudes from 1901 to 2010 and implications for the river discharge of the Alps. PG - 1330-9 LID - S0048-9697(16)31451-6 [pii] LID - 10.1016/j.scitotenv.2016.07.008 [doi] AB - Heat waves represent one of the most significant climatic stressors for ecosystems, economies and societies. A main topic of debate is whether they have increased or not in intensity and/or their duration due to the observed climate change. Firstly, this is because of the lack of reliable long-term daily temperature data at the global scale; secondly, because of the intermittent nature of such phenomena. Long datasets are required to produce a reliable and meaningful assessment. In this study, we provide a global estimate of heat wave magnitudes based on the three most appropriate datasets currently available, derived from models and observations (i.e. the 20th Century Reanalyses from NOAA and ECMWF), spanning the last century and before. The magnitude of the heat waves is calculated by means of the Heat Wave Magnitude Index daily (HWMId), taking into account both duration and amplitude. We compare the magnitude of the most severe heat waves occurred across different regions of the world and we discuss the decadal variability of the larger events since the 1850s. We concentrate our analysis from 1901 onwards, where all datasets overlap. Our results agree with other studies focusing on heat waves that have occurred in the recent decades, but using different data. In addition, we found that the percentage of global area covered by heat wave exceeding a given magnitude has increased almost three times, in the last decades, with respect to that measured in the early 20th century. Finally, we discuss the specific implications of the heat waves on the river runoff generated in the Alps, for which comparatively long datasets exist, affecting the water quality and availability in a significant portion of the European region in summer. CI - Copyright (c) 2016 Elsevier B.V. All rights reserved. FAU - Zampieri, Matteo AU - Zampieri M AD - Euro Mediterranean Center on Climate Change (CMCC), Bologna University, Bologna, Italy. Electronic address: matteo.v.zampieri@gmail.com. FAU - Russo, Simone AU - Russo S AD - Joint Research Center (JRC), Ispra, Italy. Electronic address: simone.russo@jrc.ec.europa.eu. FAU - di Sabatino, Silvana AU - di Sabatino S AD - Bologna University, Italy. Electronic address: silvana.disabatino@unibo.it. FAU - Michetti, Melania AU - Michetti M AD - CMCC, Italy. Electronic address: melania.michetti@cmcc.it. FAU - Scoccimarro, Enrico AU - Scoccimarro E AD - CMCC, National Institute of Geophysics and Volcanology (INGV), Bologna, Italy. Electronic address: enrico.scoccimarro@ingv.it. FAU - Gualdi, Silvio AU - Gualdi S AD - CMCC, National Institute of Geophysics and Volcanology (INGV), Bologna, Italy. Electronic address: silviogualdi@ingv.it. LA - eng PT - Journal Article DEP - 20160711 PL - Netherlands TA - Sci Total Environ JT - The Science of the total environment JID - 0330500 OTO - NOTNLM OT - 20th century reanalysis OT - Alps OT - Heat waves OT - River discharge OT - Water resources EDAT- 2016/07/16 06:00 MHDA- 2016/07/16 06:01 CRDT- 2016/07/16 06:00 PHST- 2016/04/15 00:00 [received] PHST- 2016/07/01 00:00 [revised] PHST- 2016/07/01 00:00 [accepted] PHST- 2016/07/16 06:00 [entrez] PHST- 2016/07/16 06:00 [pubmed] PHST- 2016/07/16 06:01 [medline] AID - S0048-9697(16)31451-6 [pii] AID - 10.1016/j.scitotenv.2016.07.008 [doi] PST - ppublish SO - Sci Total Environ. 2016 Nov 15;571:1330-9. doi: 10.1016/j.scitotenv.2016.07.008. Epub 2016 Jul 11.