10Be exposure ages of Quaternary Glaciers in Antarctica

In situ terrestrial cosmogenic nuclide(TCN)has been widely applied to date the ages of Quaternary glacial deposits in Antarctica and plays an important role in reconstructing the glacial evolution and climate change.It helps to under‐stand the Antarctic ice sheet's evolution process in Quaternary and shed light on the application of Cosmogenic Nu‐clide exposure dating technique in Glacial Geomorphology.In this paper,we retrieved 49510Be age samples in Ant‐arctica from literature published between 2004 and 2020 and recalculated the TCN ages using version 3.0 online cal‐culator of Cosmic-Ray Produced Nuclide Systematics on Earth(CRONUS-Earth).Several conclusions can be drawn from the results:(1)75%of the exposure ages are younger than 400 ka,and 91%younger than 1,100 ka.Northern Antarctic Peninsula exposure result is visibly younger than the main glaciers in East Antarctica due to climate change and geological evaluation since the LGM(Last Glacial Maximum).(2)TCN ages are relevant to the samples'relative positions in the Antarctic continent,but a relationship between their ages and elevations is yet to be determined based on the collected data.

Radar isochronic layer dating for a deep ice core at Kunlun Station, Antarctica

The ages and accumulation rates of ice are important boundary conditions for paleoclimatic ice models. Radardetected isochronic layers can be used to date the ice column beneath the ice surface and infer past accumulation rates. A Deep Ice-Core Drilling Project has been carried out at Kunlun station in the Dome A region, East Antarctica. Radio echo sounding data are collected during the 2004/2005 Chinese National Research Expedition and the 2007/2008 Dome Connection East Antarctica project of the Alfred Wegener Institute(Germany). Radar isochronic layers from the dataset were linked to compare a new deep ice core site from Kunlun station and the Vostok ice core site. Ten visible layers, accounting for ~50% ice thickness at the Kunlun station ice core site, were dated based on the Vostok ice core chronology. At 1,640 m depth below surface, an age of ~160,400 yr was determined, corresponding to a bright layer at Kunlun station. These layers provided geometric information on the past surface of the ice sheet around the ice core site through the Wisconsin glacial stage, Eemian interglacial and Marine Isotope Stage6. Based on a simple ice flow model and the age-depth relationship, we concluded that the region around the Kunlun ice core site had lower past accumulation rates, consistent with the present pattern. The age-depth relationship would thus be expected to correlate and constrain the chronology of the deep ice core at Kunlun station in the future.

基于水-油界面反应的离子交换法合成高效稳定的CsPbX3(X=Cl,Br,I)纳米晶

全无机CsPbX3钙钛矿纳米晶因其卓越的发光性能而在光电领域引起了前所未有的关注.相对于传统的热注射法,室温法是一种更简单、温和的合成钙钛矿纳米晶的方法.然而,在室温下很难获得稳定的CsPbI3纳米晶,并且室温法通常会使用极性溶剂,这些溶剂有时会降低钙钛矿纳米晶的稳定性和性能.本文提出了一种简单的合成方法,通过在水-油界面处的阴离子交换,在室温下合成了高效稳定的CsPbI3纳米晶以及其他CsPbX3纳米晶.在合成过程中,质子化的油胺充当载体.测试分析结果表明:所合成的CsPbI3纳米晶的发射峰位于680 nm,且在保存32天后仍然具有极好的发光稳定性.所合成的CsPbX3纳米晶的高量子效率和稳定性可归因于:(ⅰ)极性试剂几乎从纳米晶溶液中去除;(ⅱ)通过表面钝化有效地抑制了与缺陷有关的非辐射复合.