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Global Observational Evidence of Strong Linkage Between Dew Point Temperature and Precipitation Extremes

Lookup NU author(s): Dr Haider Ali, Professor Hayley Fowler

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley-Blackwell Publishing, Inc., 2018.

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Abstract

©2018. American Geophysical Union. All Rights Reserved. Using global station-based observations of precipitation, near-surface air temperature (SAT), and dew point temperature (DPT), we show that the negative scaling relationship found between extreme daily precipitation and SAT over the tropics is associated with the low seasonality in temperature. When using a binning technique or quantile regression, not accounting for seasonality in temperature produces a negative scaling for the majority of stations in the tropics, with higher temperatures associated with smaller precipitation extremes. After removing temperature seasonality, we find that most locations show a positive (median 5.2%/K) scaling with SAT and 96% of global locations exhibit positive (median 6.1%/K) scaling with DPT. Moreover, about 33% (22%) of the locations show super C-C scaling (higher than 7%/K) with DPT (SAT). Our results show that the impact of warming on extreme precipitation (especially over the tropics) may be higher than previously thought.

Publication metadata

Author(s): Ali H, Fowler HJ, Mishra V

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2018

Volume: 45

Issue: 22

Pages: 12320-12330

Print publication date: 28/11/2018

Online publication date: 09/11/2018

Acceptance date: 06/11/2018

Date deposited: 24/01/2019

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: Wiley-Blackwell Publishing, Inc.

URL: https://doi.org/10.1029/2018GL080557

DOI: 10.1029/2018GL080557

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