Preprints
https://doi.org/10.5194/egusphere-2023-147
https://doi.org/10.5194/egusphere-2023-147
08 Jun 2023
 | 08 Jun 2023

Identification of compound drought and heatwave events on a daily scale and across four seasons

Baoying Shan, Niko E. C. Verhoest, and Bernard De Baets

Abstract. Compound drought and heatwave (CDHW) events can incur intensified damage to ecosystems, economies, and societies, especially on a warming planet. Although it has been reported that CDHW events in the winter season can also affect insects, birds, and wildfires, the literature generally focuses on the summer season exclusively. Moreover, the coarse resolution of droughts as determined on a monthly scale may hamper a precise identification of the start and/or end dates of CDHW events. Therefore, we propose a method to identify CDHW events on a daily scale that is applicable across the four seasons. More specifically, we use standardized indices calculated on a daily scale to identify four types of compound events in a systematic way. Based on the hypothesis that droughts or heatwaves should be statistically extreme and independent, we remove minor dry or warm spells and merge mutually dependent ones. To demonstrate our method, we make use of 120 years of daily precipitation and temperature observed at Uccle, Brussels-Capital Region, Belgium. Our method yields more precise start and end dates for droughts and heatwaves than what can be obtained with a classical approach acting on a monthly scale, thus also allowing for a better identification of CDHW events. Consistent with existing literature, we find an increase in the occurrence of the number of days in CDHW events at Uccle, mainly due to the increasing frequency of heatwaves. Our results also reveal a seasonality of CDHW events as droughts and heatwaves are negatively dependent in the winter season at Uccle, while they are positively dependent in the other seasons. Overall, the method proposed in this study is shown to be robust and shows potential for exploring how year-round CDHW events influence ecosystems.

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Journal article(s) based on this preprint

08 May 2024
Identification of compound drought and heatwave events on a daily scale and across four seasons
Baoying Shan, Niko E. C. Verhoest, and Bernard De Baets
Hydrol. Earth Syst. Sci., 28, 2065–2080, https://doi.org/10.5194/hess-28-2065-2024,https://doi.org/10.5194/hess-28-2065-2024, 2024
Short summary
Baoying Shan, Niko E. C. Verhoest, and Bernard De Baets

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-147', Anonymous Referee #1, 10 Jul 2023
    • AC1: 'Reply on RC1', Baoying Shan, 17 Sep 2023
  • RC2: 'Comment on egusphere-2023-147', Anonymous Referee #2, 12 Jul 2023
    • AC2: 'Reply on RC2', Baoying Shan, 17 Sep 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-147', Anonymous Referee #1, 10 Jul 2023
    • AC1: 'Reply on RC1', Baoying Shan, 17 Sep 2023
  • RC2: 'Comment on egusphere-2023-147', Anonymous Referee #2, 12 Jul 2023
    • AC2: 'Reply on RC2', Baoying Shan, 17 Sep 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to revisions (further review by editor and referees) (25 Sep 2023) by Narendra Das
AR by Baoying Shan on behalf of the Authors (11 Oct 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to revisions (further review by editor and referees) (05 Nov 2023) by Narendra Das
AR by Baoying Shan on behalf of the Authors (09 Nov 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (02 Dec 2023) by Narendra Das
RR by Anonymous Referee #3 (20 Jan 2024)
RR by Anonymous Referee #4 (29 Jan 2024)
ED: Publish subject to minor revisions (review by editor) (10 Mar 2024) by Narendra Das
AR by Baoying Shan on behalf of the Authors (17 Mar 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (24 Mar 2024) by Narendra Das
AR by Baoying Shan on behalf of the Authors (25 Mar 2024)  Manuscript 

Journal article(s) based on this preprint

08 May 2024
Identification of compound drought and heatwave events on a daily scale and across four seasons
Baoying Shan, Niko E. C. Verhoest, and Bernard De Baets
Hydrol. Earth Syst. Sci., 28, 2065–2080, https://doi.org/10.5194/hess-28-2065-2024,https://doi.org/10.5194/hess-28-2065-2024, 2024
Short summary
Baoying Shan, Niko E. C. Verhoest, and Bernard De Baets
Baoying Shan, Niko E. C. Verhoest, and Bernard De Baets

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Short summary
This study developed a convenient and new method to identify the occurrence of droughts, heatwaves, and co-occurring droughts and heatwaves across four seasons. From that, we could know the drought (or heatwave) starts on which day and ends on which day. We found an increase in the frequency of heatwaves and the co-occurring droughts and heatwaves in Belgium caused by climate change. We also found that different months have different chances of co-occurring droughts and heatwaves.