Publication Date:
2023-09-14
Description:
Earth’s climatic evolution over the last 5 million years is primarily understood from the perspective of marine mechanisms, however, the role of terrestrial feedbacks remains largely unexplored. Here we reconstruct the last 5 million years of soil moisture variability in Central Asia using paleomagnetism data and isotope geochemistry of an 80 m-thick sedimentary succession at Charyn Canyon, Kazakhstan. We identify a long-term trend of increasing aridification throughout the period, along with shorter-term variability related to the interaction between mid-latitude westerlies and the Siberian high-pressure system. This record highlights the long-term contribution of mid-latitude Eurasian terrestrial systems to the modulation of moisture transfer into the Northern Hemisphere oceans and back onto land via westerly air flow. The response of Earth-surface dynamics to Plio-Pleistocene climatic change in Central Asia likely generated terrestrial feedbacks affecting ocean and atmospheric circulation. This missing terrestrial link elucidates the significance of land-water feedbacks for long-term global climate.
Description:
Late Cenozoic variation in Central Asian hydroclimate resulted from the interaction between mid-latitude westerlies and the Siberian high-pressure system and may have driven terrestrial feedbacks, according to analyses of sediments from Charyn Canyon, Kazakhstan.
Description:
Palaeomagnetic, rock magnetic and grain-size analyses were funded by the grant CNPq
Description:
Deutsche Forschungsgemeinschaft (German Research Foundation)
https://doi.org/10.13039/501100001659
Description:
Wilhelm und Else Heraeus-Stiftung (Wilhelm and Else Heraeus Foundation)
https://doi.org/10.13039/501100011618
Description:
https://doi.org/10.17632/v9s3bhn27k.1
Keywords:
ddc:551.6
;
palaeoclimate
;
Charyn Canyon sequence
;
Kazakhstan
;
isotope geochemistry
;
paleomagnetism
Language:
English
Type:
doc-type:article
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