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Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years

Giles Young, Mary Gagen Orcid Logo, Neil Loader Orcid Logo, Danny McCarroll, Håkan Grudd, Risto Jalkanen, Andreas Kirchhefer, Iain Robertson Orcid Logo

Geophysical Research Letters, Volume: 46, Issue: 5, Pages: 2811 - 2819

Swansea University Authors: Giles Young, Mary Gagen Orcid Logo, Neil Loader Orcid Logo, Danny McCarroll, Iain Robertson Orcid Logo

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DOI (Published version): 10.1029/2018gl081046

Abstract

Northern Fennoscandia has experienced little summer warming over recent decades, in 24 contrast to the hemispheric trend, which is strongly linked to greenhouse gas emissions. A likely25 explanation is the feedback between cloud cover and temperature. We establish the long- and26 short-term relation...

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Published in: Geophysical Research Letters
ISSN: 0094-8276 1944-8007
Published: American Geophysical Union (AGU) 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa48822
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last_indexed 2020-12-17T04:08:58Z
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A likely25 explanation is the feedback between cloud cover and temperature. We establish the long- and26 short-term relationship between summer cloud cover and temperature over Northern27 Fennoscandia, by analysing meteorological and proxy climate data. We identify opposing28 feedbacks operating at different timescales. At short timescales, dominated by internal29 variability, the cloud cover-temperature feedback is negative; summers with increased cloud30 cover are cooler and sunny summers are warmer. However, over longer timescales, at which31 forced climate changes operate, this feedback is positive, rising temperatures causing increased32 regional cloud cover and vice versa. This has occurred both during warm (Medieval Climate33 Anomaly and at present) and cool (Little Ice Age) periods. 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spelling 2020-12-16T13:31:51.8976041 v2 48822 2019-02-13 Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years e0c807e6b9b663f1c297feecd2f54c3a Giles Young Giles Young true false e677a6d0777aed90ac1eca8937e43d2b 0000-0002-6820-6457 Mary Gagen Mary Gagen true false 8267a62100791965d08df6a7842676e6 0000-0002-6841-1813 Neil Loader Neil Loader true false 6d181d926aaac8932c2bfa8d0e7f6960 Danny McCarroll Danny McCarroll true false ef8912c57e0140e9ecb2a69b7e34467e 0000-0001-7174-4523 Iain Robertson Iain Robertson true false 2019-02-13 BGPS Northern Fennoscandia has experienced little summer warming over recent decades, in 24 contrast to the hemispheric trend, which is strongly linked to greenhouse gas emissions. A likely25 explanation is the feedback between cloud cover and temperature. We establish the long- and26 short-term relationship between summer cloud cover and temperature over Northern27 Fennoscandia, by analysing meteorological and proxy climate data. We identify opposing28 feedbacks operating at different timescales. At short timescales, dominated by internal29 variability, the cloud cover-temperature feedback is negative; summers with increased cloud30 cover are cooler and sunny summers are warmer. However, over longer timescales, at which31 forced climate changes operate, this feedback is positive, rising temperatures causing increased32 regional cloud cover and vice versa. This has occurred both during warm (Medieval Climate33 Anomaly and at present) and cool (Little Ice Age) periods. This two-way feedback relationship34 therefore moderates Northern Fennoscandian temperatures during both warm and cool35 hemispheric periods. Journal Article Geophysical Research Letters 46 5 2811 2819 American Geophysical Union (AGU) 0094-8276 1944-8007 tree rings; stable isotopes; climate change; cloud cover; Palaeoclimate; carbon isotopes 16 3 2019 2019-03-16 10.1029/2018gl081046 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2020-12-16T13:31:51.8976041 2019-02-13T17:38:14.7399824 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Giles Young 1 Mary Gagen 0000-0002-6820-6457 2 Neil Loader 0000-0002-6841-1813 3 Danny McCarroll 4 Håkan Grudd 5 Risto Jalkanen 6 Andreas Kirchhefer 7 Iain Robertson 0000-0001-7174-4523 8 0048822-16042019123621.pdf 48822v2.pdf 2019-04-16T12:36:21.1300000 Output 1109526 application/pdf Version of Record true ©2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution License true eng http://creativecommons.org/licenses/by/4.0/
title Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
spellingShingle Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
Giles Young
Mary Gagen
Neil Loader
Danny McCarroll
Iain Robertson
title_short Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
title_full Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
title_fullStr Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
title_full_unstemmed Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
title_sort Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years
author_id_str_mv e0c807e6b9b663f1c297feecd2f54c3a
e677a6d0777aed90ac1eca8937e43d2b
8267a62100791965d08df6a7842676e6
6d181d926aaac8932c2bfa8d0e7f6960
ef8912c57e0140e9ecb2a69b7e34467e
author_id_fullname_str_mv e0c807e6b9b663f1c297feecd2f54c3a_***_Giles Young
e677a6d0777aed90ac1eca8937e43d2b_***_Mary Gagen
8267a62100791965d08df6a7842676e6_***_Neil Loader
6d181d926aaac8932c2bfa8d0e7f6960_***_Danny McCarroll
ef8912c57e0140e9ecb2a69b7e34467e_***_Iain Robertson
author Giles Young
Mary Gagen
Neil Loader
Danny McCarroll
Iain Robertson
author2 Giles Young
Mary Gagen
Neil Loader
Danny McCarroll
Håkan Grudd
Risto Jalkanen
Andreas Kirchhefer
Iain Robertson
format Journal article
container_title Geophysical Research Letters
container_volume 46
container_issue 5
container_start_page 2811
publishDate 2019
institution Swansea University
issn 0094-8276
1944-8007
doi_str_mv 10.1029/2018gl081046
publisher American Geophysical Union (AGU)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description Northern Fennoscandia has experienced little summer warming over recent decades, in 24 contrast to the hemispheric trend, which is strongly linked to greenhouse gas emissions. A likely25 explanation is the feedback between cloud cover and temperature. We establish the long- and26 short-term relationship between summer cloud cover and temperature over Northern27 Fennoscandia, by analysing meteorological and proxy climate data. We identify opposing28 feedbacks operating at different timescales. At short timescales, dominated by internal29 variability, the cloud cover-temperature feedback is negative; summers with increased cloud30 cover are cooler and sunny summers are warmer. However, over longer timescales, at which31 forced climate changes operate, this feedback is positive, rising temperatures causing increased32 regional cloud cover and vice versa. This has occurred both during warm (Medieval Climate33 Anomaly and at present) and cool (Little Ice Age) periods. This two-way feedback relationship34 therefore moderates Northern Fennoscandian temperatures during both warm and cool35 hemispheric periods.
published_date 2019-03-16T04:43:43Z
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score 11.04748

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