Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates
Abstract Extreme wind is the main driver of loss in North-West Europe, with flooding being the second-highest driver. These hazards are currently modelled independently, and it is unclear what the contribution of their co-occurrence is to loss. They are often associated with extra-tropical cyclones,...
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crioppubl:10.1088/1748-9326/ad1cb7 2024-06-23T07:55:16+00:00 Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates Bloomfield, H C Bates, P Shaffrey, L C Hillier, J Champion, A Cotterill, D Pope, J O Kumar, D UK Centre for Greening Finance and Investment UK Climate Resilience Programme NERC Knowledge Exchange Fellowship 2024 http://dx.doi.org/10.1088/1748-9326/ad1cb7 https://iopscience.iop.org/article/10.1088/1748-9326/ad1cb7 https://iopscience.iop.org/article/10.1088/1748-9326/ad1cb7/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Letters volume 19, issue 2, page 024019 ISSN 1748-9326 journal-article 2024 crioppubl https://doi.org/10.1088/1748-9326/ad1cb7 2024-06-03T08:14:44Z Abstract Extreme wind is the main driver of loss in North-West Europe, with flooding being the second-highest driver. These hazards are currently modelled independently, and it is unclear what the contribution of their co-occurrence is to loss. They are often associated with extra-tropical cyclones, with studies focusing on co-occurrence of extreme meteorological variables. However, there has not been a systematic assessment of the meteorological drivers of the co-occurring impacts of compound wind-flood events. This study quantifies this using an established storm severity index (SSI) and recently developed flood severity index (FSI), applied to the UKCP18 12 km regional climate simulations, and a Great Britain (GB) focused hydrological model. The meteorological drivers are assessed using 30 weather types, which are designed to capture a broad spectrum of GB weather. Daily extreme compound events (exceeding 99th percentile of both SSI and FSI) are generally associated with cyclonic weather patterns, often from the positive phase of the North Atlantic Oscillation (NAO+) and Northwesterly classifications. Extreme compound events happen in a larger variety of weather patterns in a future climate. The location of extreme precipitation events shifts southward towards regions of increased exposure. The risk of extreme compound events increases almost four-fold in the UKCP18 simulations (from 14 events in the historical period, to 55 events in the future period). It is also more likely for there to be multi-day compound events. At seasonal timescales years tend to be either flood-prone or wind-damage-prone. In a future climate there is a larger proportion of years experiencing extreme seasonal SSI and FSI totals. This could lead to increases in reinsurance losses if not factored into current modelling. Article in Journal/Newspaper North Atlantic North Atlantic oscillation IOP Publishing Environmental Research Letters |
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Abstract Extreme wind is the main driver of loss in North-West Europe, with flooding being the second-highest driver. These hazards are currently modelled independently, and it is unclear what the contribution of their co-occurrence is to loss. They are often associated with extra-tropical cyclones, with studies focusing on co-occurrence of extreme meteorological variables. However, there has not been a systematic assessment of the meteorological drivers of the co-occurring impacts of compound wind-flood events. This study quantifies this using an established storm severity index (SSI) and recently developed flood severity index (FSI), applied to the UKCP18 12 km regional climate simulations, and a Great Britain (GB) focused hydrological model. The meteorological drivers are assessed using 30 weather types, which are designed to capture a broad spectrum of GB weather. Daily extreme compound events (exceeding 99th percentile of both SSI and FSI) are generally associated with cyclonic weather patterns, often from the positive phase of the North Atlantic Oscillation (NAO+) and Northwesterly classifications. Extreme compound events happen in a larger variety of weather patterns in a future climate. The location of extreme precipitation events shifts southward towards regions of increased exposure. The risk of extreme compound events increases almost four-fold in the UKCP18 simulations (from 14 events in the historical period, to 55 events in the future period). It is also more likely for there to be multi-day compound events. At seasonal timescales years tend to be either flood-prone or wind-damage-prone. In a future climate there is a larger proportion of years experiencing extreme seasonal SSI and FSI totals. This could lead to increases in reinsurance losses if not factored into current modelling. |
author2 |
UK Centre for Greening Finance and Investment UK Climate Resilience Programme NERC Knowledge Exchange Fellowship |
format |
Article in Journal/Newspaper |
author |
Bloomfield, H C Bates, P Shaffrey, L C Hillier, J Champion, A Cotterill, D Pope, J O Kumar, D |
spellingShingle |
Bloomfield, H C Bates, P Shaffrey, L C Hillier, J Champion, A Cotterill, D Pope, J O Kumar, D Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates |
author_facet |
Bloomfield, H C Bates, P Shaffrey, L C Hillier, J Champion, A Cotterill, D Pope, J O Kumar, D |
author_sort |
Bloomfield, H C |
title |
Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates |
title_short |
Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates |
title_full |
Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates |
title_fullStr |
Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates |
title_full_unstemmed |
Synoptic conditions conducive for compound wind-flood events in Great Britain in present and future climates |
title_sort |
synoptic conditions conducive for compound wind-flood events in great britain in present and future climates |
publisher |
IOP Publishing |
publishDate |
2024 |
url |
http://dx.doi.org/10.1088/1748-9326/ad1cb7 https://iopscience.iop.org/article/10.1088/1748-9326/ad1cb7 https://iopscience.iop.org/article/10.1088/1748-9326/ad1cb7/pdf |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Environmental Research Letters volume 19, issue 2, page 024019 ISSN 1748-9326 |
op_rights |
http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-9326/ad1cb7 |
container_title |
Environmental Research Letters |
_version_ |
1802647771271921664 |