Two types of millennial-scale climate oscillations during the last Quaternary and their triggering mechanism

doi:10.13745/j.esf.sf.2021.9.56

Abstract

Abstract:

Dansgaard-Oeschger events (DO) and Heinrich Stadial (HS) are the most pronounced millennial-scale climate oscillations during the Quaternary. HS, also called HS-DO event, is considered a special DO type in some occasions. Massive ice sheet melting associated with HS occurs during the cold phase of DO cycles, in contradiction to the expectation that ice sheets expand in colder climates and shrink in warmer climates. These events have global climate impacts and thus have been the focus of paleoclimate community for the past several decades, but their triggering mechanism are still under debate. This work summarizes all current available proxy records that contain fingerprints of these abrupt climate oscillations, and discusses limitations in the mechanistic explanations for DO and HS-DO based on current available modeling results, as well as future prospects especially the prospects of modeling these events.

Key words: millennial-scale climate oscillation, atlantic meridional overturning circulation, marine isotope stage 3

CLC Number:

P532
P533

ZHANG Xiao, ZHANG Xu. Two types of millennial-scale climate oscillations during the last Quaternary and their triggering mechanism[J]. Earth Science Frontiers, 2022, 29(5): 322-333.

Figures/Tables 4

Fig.1 Reconstruction of AMOC intensity and Greenland temperature. Modified after [80].

Fig.2 Schematic diagram of different stable states of AMOC. Modified after [89].

Fig.2 Changes of simulated physical quantities in sea ice driving theory. Modified after [99].

Fig.4 The gray area of 5km geopotential height field is the range of ice sheet in the middle glacial period of the model. Modified after [101].

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