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Cloud Cover Feedback Moderates Fennoscandian Summer Temperature Changes Over the Past 1,000 Years / Giles H. F. Young; Mary H. Gagen; Neil J. Loader; Danny McCarroll; Håkan Grudd; Risto Jalkanen; Andreas Kirchhefer; Iain Robertson

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

Swansea University Author: Young, Giles

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DOI (Published version): 10.1029/2018GL081046

Abstract

Northern Fennoscandia has experienced little summer warming over recent decades, in starkcontrast to the hemispheric trend, which is strongly linked to greenhouse gas emissions. A likely explanationis the feedback between cloud cover and temperature. We establish the long‐ and short‐term relationshi...

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Published in: Geophysical Research Letters
ISSN: 0094-8276 1944-8007
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa49189
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Abstract: Northern Fennoscandia has experienced little summer warming over recent decades, in starkcontrast to the hemispheric trend, which is strongly linked to greenhouse gas emissions. A likely explanationis the feedback between cloud cover and temperature. We establish the long‐ and short‐term relationshipsbetween summer cloud cover and temperature over Northern Fennoscandia, by analyzing meteorologicaland proxy climate data. We identify opposing feedbacks operating at different timescales. At shorttimescales, dominated by internal variability, the cloud cover‐temperature feedback is negative; summerswith increased cloud cover are cooler and sunny summers are warmer. However, over longer timescales, atwhich forced climate changes operate, this feedback is positive, rising temperatures causing increasedregional cloud cover and vice versa. This has occurred both during warm (Medieval Climate Anomaly and atpresent) and cool (Little Ice Age) periods. This two‐way feedback relationship therefore moderates NorthernFennoscandian temperatures during both warm and cool hemispheric periods.
Keywords: tree rings, stable isotopes, climate change, cloud cover, Paleoclimate, carbon isotopes
College: College of Science
Issue: 5
Start Page: 2811
End Page: 2819