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The effects of climatic change and inter-annual variability on glacier retreat from ~ 1850s AD moraines in the Kuoqionggangri peak region, southern Tibetan Plateau

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Abstract

Glaciers reflect integrated climate signals from inter-annual to centennial timescales. In using glacier extent as a climate-change detector, the challenge is to distinguish the roles of the inter-annual climate variability and long-term climatic change on the glacier change. Using cosmogenic nuclide 10Be dating method and glacier dynamical models, this study numerically reconstructed glacier extents at ~ 1850s AD (latest Little Ice Age period) in the Keqiong Qu I, Keqiong Qu II, Taqiong Qu I, and Taqiong Qu II valleys around the Kuoqionggangri peak, southern Tibetan Plateau, and quantified the effects of inter-annual summer temperature variability and long-term summer temperature change on the glacier retreats since then. Without change in mean annual precipitation, the summer temperature decrease of 0.40–0.53 °C from present was required to sustain the glacier lengths at their respective ~ 1850s AD moraines in the four valleys. The climate inferences from the glacier-climate modeling were similar to reconstructions at other glaciers on the Tibetan Plateau and the changes in long term climate reanalysis (HadCRUT5, BEST and NOAA 20CR v3). Forced by the inter-annual variabilities in summer temperature and annual precipitation, the glaciers had excursions of 150–200 m (5–8% of their lengths) from the ~ 1850s AD moraines. We therefore argued that the climate change was largely responsible for the glacier retreats from the ~ 1850s AD moraine positions in the region.

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Data availability

The cosmogenic 10Be chronological data are in the supplement. The climate reanalysis data of HadCRUT5, BEST and NOAA 20CR v3 can be accessed respectively through the Climate Research Unit (https://crudata.uea.ac.uk/cru/data//temperature/), Berkeley Earth Surface Temperature (https://berkeleyearth.org/data/), and Physical Science Laboratory, NOAA (https://psl.noaa.gov/data/gridded/data.20thC_ReanV3.html).

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Acknowledgements

This research was funded by the National Natural Science Foundation of China (NSFC Grant no. 42071002, 41771019, 41988101), the Second Tibetan Plateau Scientific Expedition and Research Program (STEP, 2019QZKK0101), and the Science and Technology Department of Tibet Program (XZ202301ZY0022G). We thank Jingdong Zhao and Hua Du for their help in the processing and measuring for the 10Be samples, and Chaolu Yi and Gang Hu for their discussion about the climatic driver for the glacier retreat.

Funding

This research was funded by the National Natural Science Foundation of China (NSFC Grant nos. 42071002, 41771019), the Second Tibetan Plateau Scientific Expedition and Research Program (STEP, 2019QZKK0101), and the Science and Technology Department of Tibet Program (XZ202301ZY0022G).

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XX and BX designed the research. XX, GD, and BP performed the fieldwork and tested 10Be age samples. XX, HZ, and YS were involved in the glacier modeling. XX, HZ, JL wrote the manuscript. All authors reviewed and revised the manuscript.

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Correspondence to Xiangke Xu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Xu, X., Zhang, H., Sun, Y. et al. The effects of climatic change and inter-annual variability on glacier retreat from ~ 1850s AD moraines in the Kuoqionggangri peak region, southern Tibetan Plateau. Clim Dyn (2023). https://doi.org/10.1007/s00382-023-07041-w

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  • DOI: https://doi.org/10.1007/s00382-023-07041-w

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