Cold waves are getting milder in the northern midlatitudes
Abstract The strong two-day cold wave in the midwestern United States in January 2019 again ignited the discussion as to whether cold waves are getting more severe or not as a result of Arctic amplification due to climate change. Assessing the evolution of cold waves in the northern hemisphere midla...
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crioppubl:10.1088/1748-9326/ab4867 2024-10-13T14:05:42+00:00 Cold waves are getting milder in the northern midlatitudes van Oldenborgh, Geert Jan Mitchell-Larson, Eli Vecchi, Gabriel A de Vries, Hylke Vautard, Robert Otto, Friederike Seventh Framework Programme 2019 http://dx.doi.org/10.1088/1748-9326/ab4867 https://iopscience.iop.org/article/10.1088/1748-9326/ab4867 https://iopscience.iop.org/article/10.1088/1748-9326/ab4867/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Letters volume 14, issue 11, page 114004 ISSN 1748-9326 journal-article 2019 crioppubl https://doi.org/10.1088/1748-9326/ab4867 2024-09-17T04:17:59Z Abstract The strong two-day cold wave in the midwestern United States in January 2019 again ignited the discussion as to whether cold waves are getting more severe or not as a result of Arctic amplification due to climate change. Assessing the evolution of cold waves in the northern hemisphere midlatitudes in the observations has been difficult because the variability of cold waves is large compared to anthropogenic warming. In order to detect changes in cold spells, two complementary ways to optimise the signal-to-noise ratio are employed: multi-decadal series at individual stations, and for shorter time periods by using spatially aggregated measures. Global warming is now strong enough to make trends clear at individual stations when considering long enough (>50 yr) records of daily minimum and maximum temperature. Calculating the land area that has temperatures below the 1-in-10 year return value (defined over 1951–1980) enables us to investigate trends over a shorter time horizon. The long-term station data have strong decreases everywhere in the lowest minimum temperature. Warming trends in the lowest maximum temperature are smaller over most of the Northern Hemisphere, with dataset-dependent indications of possible negative trends in parts of the United States and Mexico. Considering the area experiencing cold waves over the last decades, the most notable feature is a sharp decline of this area since the 1980s. The natural variability is still so large that it is possible to arbitrarily select starting dates after the decline for which the trend is slightly positive in smaller regions like North America or Europe. However, these values are within uncertainties compatible with a steady decline and have differing starting dates in North America and Europe. An analysis of the entire northern midlatitudes confirms the steady decrease in severity and frequency of cold waves over the last decades in the observations. Article in Journal/Newspaper Arctic Climate change Global warming IOP Publishing Arctic Environmental Research Letters 14 11 114004 |
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Abstract The strong two-day cold wave in the midwestern United States in January 2019 again ignited the discussion as to whether cold waves are getting more severe or not as a result of Arctic amplification due to climate change. Assessing the evolution of cold waves in the northern hemisphere midlatitudes in the observations has been difficult because the variability of cold waves is large compared to anthropogenic warming. In order to detect changes in cold spells, two complementary ways to optimise the signal-to-noise ratio are employed: multi-decadal series at individual stations, and for shorter time periods by using spatially aggregated measures. Global warming is now strong enough to make trends clear at individual stations when considering long enough (>50 yr) records of daily minimum and maximum temperature. Calculating the land area that has temperatures below the 1-in-10 year return value (defined over 1951–1980) enables us to investigate trends over a shorter time horizon. The long-term station data have strong decreases everywhere in the lowest minimum temperature. Warming trends in the lowest maximum temperature are smaller over most of the Northern Hemisphere, with dataset-dependent indications of possible negative trends in parts of the United States and Mexico. Considering the area experiencing cold waves over the last decades, the most notable feature is a sharp decline of this area since the 1980s. The natural variability is still so large that it is possible to arbitrarily select starting dates after the decline for which the trend is slightly positive in smaller regions like North America or Europe. However, these values are within uncertainties compatible with a steady decline and have differing starting dates in North America and Europe. An analysis of the entire northern midlatitudes confirms the steady decrease in severity and frequency of cold waves over the last decades in the observations. |
author2 |
Seventh Framework Programme |
format |
Article in Journal/Newspaper |
author |
van Oldenborgh, Geert Jan Mitchell-Larson, Eli Vecchi, Gabriel A de Vries, Hylke Vautard, Robert Otto, Friederike |
spellingShingle |
van Oldenborgh, Geert Jan Mitchell-Larson, Eli Vecchi, Gabriel A de Vries, Hylke Vautard, Robert Otto, Friederike Cold waves are getting milder in the northern midlatitudes |
author_facet |
van Oldenborgh, Geert Jan Mitchell-Larson, Eli Vecchi, Gabriel A de Vries, Hylke Vautard, Robert Otto, Friederike |
author_sort |
van Oldenborgh, Geert Jan |
title |
Cold waves are getting milder in the northern midlatitudes |
title_short |
Cold waves are getting milder in the northern midlatitudes |
title_full |
Cold waves are getting milder in the northern midlatitudes |
title_fullStr |
Cold waves are getting milder in the northern midlatitudes |
title_full_unstemmed |
Cold waves are getting milder in the northern midlatitudes |
title_sort |
cold waves are getting milder in the northern midlatitudes |
publisher |
IOP Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1088/1748-9326/ab4867 https://iopscience.iop.org/article/10.1088/1748-9326/ab4867 https://iopscience.iop.org/article/10.1088/1748-9326/ab4867/pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Global warming |
genre_facet |
Arctic Climate change Global warming |
op_source |
Environmental Research Letters volume 14, issue 11, page 114004 ISSN 1748-9326 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-9326/ab4867 |
container_title |
Environmental Research Letters |
container_volume |
14 |
container_issue |
11 |
container_start_page |
114004 |
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1812811762813108224 |