FN Archimer Export Format
PT J
TI Mid-Holocene climate at mid-latitudes: assessing the impact of the Saharan greening
BT 
AF Gaetani, Marco
   Messori, Gabriele
   Pausata, Francesco S. R.
   Tiwari, Shivangi
   Alvarez Castro, M. Carmen
   Zhang, Qiong
AS 1:1;2:2,3;3:4;4:4;5:5;6:6;
FF 1:;2:;3:;4:;5:;6:;
C1 University School for Advanced Studies IUSS, Pavia, Italy
   Dept. of Earth Sciences and Centre of Natural Hazards and Disaster Science (CNDS), Uppsala University, Sweden
   Dept. of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
   University of Quebec in Montreal, Canada
   Dept. of Physical, Chemical and Natural Systems, Pablo de Olavide University, Seville, Spain
   Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
C2 UNIV PAVIA, ITALY
   UNIV UPPSALA, SWEDEN
   UNIV STOCKHOLM, SWEDEN
   UNIV QUEBEC, CANADA
   UNIV PABLO OLAVIDE, SPAIN
   UNIV STOCKHOLM, SWEDEN
IN DOAJ
TC 0
UR https://archimer.ifremer.fr/doc/00876/98751/108361.pdf
LA English
DT Article
CR IMAGES 1-MD101
   MD 114 / IMAGES V GINNA
BO Marion Dufresne
AB During the first half of the Holocene (11,000 to 5,000 years ago) the Northern Hemisphere experienced a strengthening of the monsoonal regime, with climate reconstructions robustly suggesting a greening of the Sahara region. Paleoclimate archives also show that this so-called African Humid Period (AHP) was accompanied by changes in the climate conditions at mid to high latitudes. However, inconsistencies still exist in reconstructions of the mid-Holocene (MH) climate at mid-latitudes, and model simulations provide limited support to reduce these discrepancies. In this paper, a set of simulations performed with a climate model is used to investigate the hitherto unexplored impact of the Saharan greening on mid-latitude atmospheric circulation during the MH. Numerical simulations show a year-round impact of the Saharan greening on the main circulation features in the Northern Hemisphere, especially during boreal summer when the African monsoon develops. Key findings include a westward shift of the global Walker Circulation, leading to a modification of the North Atlantic jet stream in summer and the North Pacific jet stream in winter. Furthermore, the Saharan greening modifies the atmospheric synoptic circulation over the North Atlantic, transitioning the North Atlantic Oscillation phase from prevailingly positive to neutral-to-negative in winter and summer. This study provides a first constraint on the Saharan greening influence on northern midlatitudes, indicating new opportunities for understanding the MH climate anomalies in regions such as North America and Eurasia. 
PY 2024
PD FEB
SO EGUsphere
PU Copernicus GmbH
DI 10.5194/egusphere-2024-272
ID 98751
ER

EF