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The “Hockey Stick” Imprint in Northwest African Speleothems

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Title
The “Hockey Stick” Imprint in Northwest African Speleothems
Author(s)
Sha, Lijuan; Brahim, Yassine Ait; CCP; Yin, Jianjun; Lu, Jiayu; Cruz, Francisco W.; Cai, Yanjun; Edwards, R. Lawrence; Cheng, Hai
Publication Date
2021-09-16
Journal
Geophysical Research Letters, v.48, no.17
Publisher
John Wiley and Sons Inc
Abstract
© 2021. American Geophysical Union. All Rights Reserved.We present absolutely dated speleothem δ18O records spanning the past ∼1.5 kyr, which provide new evidence of the transmission of an anthropogenic signal to natural climatic archives in NW Africa. Combined with three other speleothem δ18O records from SW Morocco, the results indicate unprecedentedly dry conditions during the 20th century, which developed more rapidly than those during the Medieval Climate Anomaly (900–1350 CE), likely due to rising atmospheric CO2 levels. The 20th century drying evident in the speleothem records is consistent with the “Hockey Stick” pattern of increasing temperatures due to global warming. We demonstrate that this rapid drying is linked to warmer sea surface temperatures (SSTs) over the Azores High region, and cooler local SSTs off the coast of NW Africa. These changes intensified the Canary Current Upwelling, which promoted increased biological productivity in the surface water and enhanced the coastal fishing industry in Morocco.
URI
https://pr.ibs.re.kr/handle/8788114/10333
DOI
10.1029/2021GL094232
ISSN
0094-8276
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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