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Past terrestrial hydroclimate sensitivity controlled by Earth system feedbacks
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DOI：10.1038/s41467-022-28814-7.png)
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Abstract
En 中文
Despite tectonic conditions and atmospheric CO2 levels (pCO(2)) similar to those of present-day, geological reconstructions from the mid-Pliocene (3.3-3.0 Ma) document high lake levels in the Sahel and mesic conditions in subtropical Eurasia, suggesting drastic reorganizations of subtropical terrestrial hydroclimate during this interval. Here, using a compilation of proxy data and multi-model paleoclimate simulations, we show that the mid-Pliocene hydroclimate state is not driven by direct CO2 radiative forcing but by a loss of northern high-latitude ice sheets and continental greening. These ice sheet and vegetation changes are long-term Earth system feedbacks to elevated pCO(2). Further, the moist conditions in the Sahel and subtropical Eurasia during the mid-Pliocene are a product of enhanced tropospheric humidity and a stationary wave response to the surface warming pattern, which varies strongly with land cover changes. These findings highlight the potential for amplified terrestrial hydroclimate responses over long timescales to a sustained CO2 forcing. In contrast to future projections, paleoclimate records often find wetter subtropics in tandem with elevated CO2. Here, a compilation of proxies and simulations are used to reveal the climate dynamics and feedbacks responsible for generating wet subtropics during the mid-Pliocene.
Keywords:
TEMPERATURE-GRADIENTS
PLIOMIP2 SIMULATIONS
AFRICAN MONSOON
LATE PLIOCENE
MINERAL DUST
CLIMATE
MODEL
CIRCULATION
VEGETATION
PRECIPITATION
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