Temperature evolution from the δ 18O record of Hani peat, Northeast China, in the last 14000 years

Abstract

From the last deglaciation to the Holocene, the Greenland Ice Core (GISP2) δ 18 O records as well as the records of ice-rafted debris on the surface of the North Atlantic have revealed a succession of sudden cooling events on the centennial to millennial scales. However, the temperature proxy records are rarely studied systematically and directly to ensure that this air temperature cooling pattern simultaneously existed in the East Asian Region, in addition to the repeated pattern occurring in the Greater Atlantic Region. A peat cellulose δ 18 O temperature proxy record proximately existing for 14000 years was picked up from the Hani peat in Jilin Province, China. It suggests by comparison that the sudden cooling events, such as the Older Dryas, Inter-Allerød, Younger Dryas, and nine ice-rafted debris events of the North Atlantic, are almost entirely reiterated in the temperature signals of Hani peat cellulose δ 18 O. These cooling events show that the repeatedly occurring temperature cooling pattern not only appeared in the North Atlantic Region in the high latitudes, but also in the Northwest Pacific Region in the middle latitudes. The climate change events marking the start of the Holocene Epoch, the Holocene Megathermal, the "8.2 kyr" event, the "4.2 kyr" event, the Medieval Warm Period, and the Little Ice Age are further discussed. The sensitivity response of Hani peat cellulose δ 18 O to the land surface temperature and the reason for the age accuracy of peat cellulose 14 C are also discussed based on the characteristics of the peat bog environment.

Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China

“…We note that variations in the MAAT peat record do not coincide with the peat cellulose δ 18 O temperature record from the same setting (Fig. 2B); this might be due to the mixed signal of precipitation and temperature recorded by the latter (Hong et al, 2009, and references therein).…”

“…18 O records from the Hani peat have been used to qualitatively reconstruct temperature changes since the deglaciation (Hong et al, 2009), quantitative temperature records from this region are lacking. Such records are critical for interrogating models of Asian climate change.…”

Compositions of aliphatic des-A-triterpenes in the Hani peat deposit, Northeast China and its biological significance

“…In addition, the ratios of individual compounds also display different patterns and are high on average during these periods (Figure 4). The temperature is still low [35]. From 11400 to 9800 a, the pollen concentration at the Gushantun bog is higher than that of the previous periods.…”

“…At the same time, the aliphatic des-A-triterpenes are easily converted to the corresponding aromatic derivatives [7]. Therefore, the strong microbial activities result in the abundant aromatic derivatives and relatively low des-A-triterpenes during the period with the warm-dry early Holocene [35,39] and relatively low sedimentation rate. However, interestingly, the des-A-triterpenes are high at these periods.…”

Grain-size characteristics of sediment in Daniugou peatland in Changbai Mountains, Northeast China: Implications for atmospheric dust deposition

“…Peatland is an important ecosystem of the Changbai Mountains, and many studies have been conducted on the assessment of the vulnerability of this ecosystem and environmental changes (Jiang et al, 2008;Hong et al, 2009;Bao et al, 2010). However, the studies related to atmospheric dust are still insufficient due to the poor understanding of the sedimentological character of the peat sequence.…”