TY - JOUR
T1 - Ice sheet expansion in the Cretaceous greenhouse world
AU - Wang, Tianyang
AU - He, Songlin
AU - Zhang, Qinghai
AU - Ding, Lin
AU - Farnsworth, Alexander
AU - Cai, Fulong
AU - Wang, Chao
AU - Xie, Jing
AU - Li, Guobiao
AU - Sheng, Jiani
AU - Yue, Yahui
N1 - Publisher Copyright:
© 2023
PY - 2024
Y1 - 2024
N2 - Globally elevated temperatures during the Cretaceous extreme greenhouse climate interval were punctuated by the Valanginian cooling event, which was characterized by a positive carbon isotope excursion, global cooling, and a glacial event approximately at 135 Ma. Disentangling ocean temperature and continental ice volume trends enables us to better understand climate fluctuations over deep time. We investigated the ocean temperature–ice sheet dynamics of glaciation events that occurred in the Cretaceous greenhouse world. New clumped isotope and δ18O data from sites in the Tethyan Ocean show that seawater temperatures decreased by 5–6 °C, consistent with the development of glacial periods, and maximum ice volumes about half the size of present-day Antarctica. This cooling event provides a counter-example to other Mesozoic climate transitions driven by changes in atmospheric greenhouse gas contents. Our results emphasize the importance of quantitatively reconstructing continental ice volume, providing further support for exploring deep-time Earth climate dynamics.
AB - Globally elevated temperatures during the Cretaceous extreme greenhouse climate interval were punctuated by the Valanginian cooling event, which was characterized by a positive carbon isotope excursion, global cooling, and a glacial event approximately at 135 Ma. Disentangling ocean temperature and continental ice volume trends enables us to better understand climate fluctuations over deep time. We investigated the ocean temperature–ice sheet dynamics of glaciation events that occurred in the Cretaceous greenhouse world. New clumped isotope and δ18O data from sites in the Tethyan Ocean show that seawater temperatures decreased by 5–6 °C, consistent with the development of glacial periods, and maximum ice volumes about half the size of present-day Antarctica. This cooling event provides a counter-example to other Mesozoic climate transitions driven by changes in atmospheric greenhouse gas contents. Our results emphasize the importance of quantitatively reconstructing continental ice volume, providing further support for exploring deep-time Earth climate dynamics.
KW - Clumped and oxygen isotopes
KW - Global carbon-cycle dynamics
KW - Paleoclimatic reconstruction
KW - Polar ice volume
KW - Valanginian cooling event
UR - http://www.scopus.com/inward/record.url?scp=85171792550&partnerID=8YFLogxK
U2 - 10.1016/j.fmre.2023.05.005
DO - 10.1016/j.fmre.2023.05.005
M3 - Article (Academic Journal)
AN - SCOPUS:85171792550
SN - 2096-9457
JO - Fundamental Research
JF - Fundamental Research
ER -
