EGU21-1733
https://doi.org/10.5194/egusphere-egu21-1733
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Diverse manifestations of insolation forcing of environmental changes during the middle Piacenzian

Peng Gao and Junsheng Nie
Peng Gao and Junsheng Nie
  • Lanzhou University, China (gaop18@lzu.edu.cn)

The middle Piacenzian period is the closest sustained warm interval and a possible analog to the future climate. It is well known that global ice volume exhibits dominant 41-kyr cyclicities. However, high resolution terrestrial paleoenvironmental records are scare. Here we present a 3.6 kyr terrestrial environmental variation record from Teruel Basin of Spain and compare the results with the East Asian monsoon records. The Spain results show dominant 41-kyr cycles during the early Piacenzian (3.3-3.15 Ma) when eccentricity was at minimum, but the 41-kyr cycles weakens during the late Piacenzian 3.15-2.95 Ma when eccentricity got increased, suggesting direct forcing by insolation. This pattern is different from the monsoonal records from China, which demonstrates persistent 20-kyr cycles during the entire middle Piacenzian. The strong 41-kyr cycles in westerly region during the early Piacenzian may originate from its higher latitude and higher sensitivity to insolation gradient forcing.

How to cite: Gao, P. and Nie, J.: Diverse manifestations of insolation forcing of environmental changes during the middle Piacenzian, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1733, https://doi.org/10.5194/egusphere-egu21-1733, 2021.