Quantification of Uncertainty in Projections of Extreme Daily Precipitation

Seokhyeon Kim, Sajjad Eghdamirad, Ashish Sharma, Joong Hoon Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Projections of extreme precipitation are of considerable interest in a range of design and management applications. These projections, however, can exhibit uncertainty that requires quantification to provide confidence to any application they are used in. This study assesses the uncertainty in projected extreme daily precipitation, separated into model, scenario, and ensemble components using the square root error variance (SREV) rationale. For this, 45 projections of daily precipitation from the Coupled Model Intercomparison Project Phase 5 (CMIP5) are used, consisting of multiple global circulation models and their ensemble members, for a range of Representative Concentration Pathways, allowing assessment across land-covered areas worldwide. It is found that the uncertainty in dry regions is significantly higher compared to wet regions, raising concerns regarding infrastructure design for the future in arid parts of the world. It is also found that the climate scenarios and initialization contribute significantly to the overall uncertainty, compared to contributions for more nonextreme precipitation simulations. This finding has implications in how design precipitation extremes ought to be projected into the future, with greater attention being paid on a broader selection of emission scenarios and initializations than is the case with projections of nonextreme precipitations.

Original languageEnglish
Article numbere2019EA001052
JournalEarth and Space Science
Volume7
Issue number8
DOIs
Publication statusPublished - 2020 Aug 1

Keywords

  • daily precipitation projections
  • extreme precipitation uncertainty
  • global circulation models

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Earth and Planetary Sciences(all)

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