The ``Hockey Stick{''} Imprint in Northwest African Speleothems

Autor(es)

Sha, Lijuan ^[1] ; Brahim, Yassine Ait ^[2] ; Wassenburg, Jasper A. ^{[3, 4]} ; Yin, Jianjun ^[5] ; Lu, Jiayu ^[1] ; Cruz, Francisco W. ^[6] ; Cai, Yanjun ^[1] ; Edwards, R. Lawrence ^[7] ; Cheng, Hai ^{[1, 5, 8]}

Afiliação do(s) autor(es)

^[1] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian - Peoples R China

^[2] Univ Basel, Dept Environm Sci, Basel - Switzerland

^[3] Inst Basic Sci, Ctr Climate Phys, Busan - South Korea

^[4] Pusan Natl Univ, Busan - South Korea

^[5] Chinese Acad Geol Sci, Key Lab Karst Dynam, MNR & Guangxi, Inst Karst Geol, Guilin - Peoples R China

^[6] Sao Paulo, Inst Geociencias Univ, Sao Paulo - Brazil

^[7] Univ Minnesota, Dept Earth Sci, Minneapolis, MN - USA

^[8] Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: Geophysical Research Letters; v. 48, n. 17 SEP 16 2021.
• Citações Web of Science: 0

Resumo

We present absolutely dated speleothem delta O-18 records spanning the past similar to 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 delta O-18 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. (AU)

• Processo FAPESP: 17/50085-3 - PIRE: educação e pesquisa em clima das Américas usando os exemplos de anéis de árvores e espeleotemas (PIRE-CREATE)
• Beneficiário: Francisco William da Cruz Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático