Abstract
Abstract. There is considerable controversy regarding the age ranges of Tibetan ice cores. The Guliya ice core was reported to reach as far back as ∼760 ka (kiloannum, i.e. 1000 years), whereas chronologies of all other Tibetan cores cover at most the Holocene. Here we present ages for two new ice cores reaching bedrock, from the Zangser Kangri (ZK) glacier in the northwestern Tibetan Plateau and the Shulenanshan (SLNS) glacier in the western Qilian Mountains. We estimated bottom ages of 8.90±0.570.56 ka and 7.46±1.461.79 ka for the ZK and SLNS ice core respectively, further constraining the time range accessible by Tibetan ice cores to the Holocene.
Highlights
Tibetan ice cores have provided a wealth of information for past climatic and environmental conditions at different timescales
We present more evidence from the bottom age estimates of two new Tibetan bedrock ice cores from the Zangser Kangri and Shulenanshan glaciers based on accelerator mass spectrometry (AMS) 14C measurements of the waterinsoluble organic carbon (WIOC) fraction of carbonaceous aerosols embedded in the glacier ice (Jenk et al, 2007, 2009; Uglietti et al, 2016)
It should be noted that this 14C-derived age represents the average age of the entire ice core sample section
Summary
Tibetan ice cores have provided a wealth of information for past climatic and environmental conditions at different timescales. We present more evidence from the bottom age estimates of two new Tibetan bedrock ice cores from the Zangser Kangri and Shulenanshan glaciers (see Fig. 1 for locations) based on accelerator mass spectrometry (AMS) 14C measurements of the waterinsoluble organic carbon (WIOC) fraction of carbonaceous aerosols embedded in the glacier ice (Jenk et al, 2007, 2009; Uglietti et al, 2016) This recently established technique, which was validated by dating ice of known age (Uglietti et al, 2016), was applied for establishing the chronology of the Tibetan Chongce ice cores (Hou et al, 2018)
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