Widespread increases in the frequency of wet days are observed across Asia and the United States, and widespread increases in the precipitation intensity are observed across Europe and Australia. This means that when it rains, light, moderate, or heavy wet-day precipitation has become more intense across most of the globe. The main finding of this study is that precipitation has intensified across a majority of land areas globally throughout the wet-day distribution. This study investigates changes in the number of wet days (≥1 mm) and the entire distribution of daily wet- and all-day records, in addition to trends in annual and seasonal totals from daily records, between 19. In this study, a new gridded dataset of daily precipitation, called Rainfall Estimates on a Gridded Network (REGEN) V1–2019, was used to perform an assessment of the climatic changes in precipitation at each global land location (except Antarctica). 2013a.Įstimates of observed long-term changes in daily precipitation globally have been limited due to availability of high-quality observations. 2007 Wang and Zhou 2005 Wang and Zhou 2005 Haylock et al. 2004 Higgins and Kousky 2013 Klein Tank and Können 2013 Zolina et al. 2007 Taschetto and England 2009 Groisman et al. 2017 Taschetto and England 2009 Shi et al. 2013 Re and Barros 2009 Castañeda and González 2008 Zandonadi et al. 2013 Klein Tank and Können 2003 Zoline et al. 2004 Higgins and Kousy 2013 Alexander et al. References for numbers are as follows: Vincent and Mekis 2006 Mekis and Vincent 2011 Yagouti et al. Regions with unknown changes in all three categories (frequency, intensity, and totals) are not marked. High confidence was given to those changes with at least two studies supporting them and no conflicting results between any studies.
Numbers inside square brackets refer to the references at the end of this caption. The symbols “+”, “−”, and “.” refer to increases, decreases, and unknown (due to a lack of studies, disagreement in literature regarding the direction of change, and/or the changes are not statistically significant) change, respectively. The three symbols are related to changes in frequency, intensity, and totals (see text for definitions), respectively, from left to right.
Summary of regions with high confidence in changes in (a) mean and (b) extreme precipitation frequency, intensity, or totals.
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