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Hysteresis of European summer precipitation under a symmetric CO2 ramp-up and ramp-down pathway : Hysteresis of European summer precipitation under a symmetric CO<sub>2</sub> ramp-up and ramp-down pathway
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- Authors
- Issue Date
- 2024-07
- Publisher
- Institute of Physics Publishing
- Citation
- Environmental Research Letters, Vol.19 No.7, p. 074030
- Abstract
- This study investigates the mechanism of the hysteresis of European summer mean precipitation in a CO2 removal (CDR) simulation. The European summer mean precipitation exhibits robust hysteresis in response to the CO2 forcing; after decreasing substantially (similar to 40%) during the ramp-up period, it shows delayed recovery during the ramp-down period. We found that the precipitation hysteresis over Europe is tied to the hysteresis in the Atlantic Meridional Overturning Circulation (AMOC). During the ramp-down period, an anomalous high surface pressure circulation prevails over Europe. The anomalous high pressure system is a baroclinic response of the atmosphere to strong North Atlantic cooling associated with a weakened AMOC. This anomalous circulation suppresses summertime convective activity over the entire Europe by decreasing near-surface moist enthalpy in Central and Northern Europe while increasing lower free-tropospheric temperature in Southern Europe. Our findings underscore the need to understand complex interactions in the Earth system for reliable future projections of regional precipitation change under CDR scenarios.
- ISSN
- 1748-9326
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Related Researcher
- College of Natural Sciences
- Department of Earth and Environmental Sciences
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