Understanding climate proxy records that preserve physical characteristics of past climate is a prerequisite to reconstruct long‐term climatic conditions. Water stable isotope ratios (δ¹⁸O) constitute a widely used proxy in ice cores to reconstruct temperature and climate. However, the original climate signal is altered between the formation of precipitation and the ice, especially in low‐accumulation areas such as the East Antarctic Plateau. Atmospheric conditions under which the isotopic signal is acquired at Aurora Basin North (ABN), East Antarctica, are characterized with the regional atmospheric model Modèle Atmosphérique Régional (MAR). The model shows that 50% of the snow is accumulated in less than 24 days year⁻¹. Snowfall occurs throughout the year and intensifies during winter, with 64% of total accumulation between April and September, leading to a cold bias of −0.86°C in temperatures above inversion compared to the annual mean of −29.7°C. Large snowfall events are associated with high‐pressure systems forcing warm oceanic air masses toward the Antarctic interior, which causes a warm bias of +2.83°C. The temperature‐δ¹⁸O relationship, assessed with the global atmospheric model ECHAM5‐wiso, is primarily constrained by the winter variability, but the observed slope is valid year‐round. Three snow δ¹⁸O records covering 2004–2014 indicate that the anomalies recorded in the ice core are attributable to the occurrence of warm winter storms bringing precipitation to ABN and support the interpretation of δ¹⁸O in this region as a marker of temperature changes related to large‐scale atmospheric conditions, particularly blocking events and variations in the Southern Annular Mode.

中文翻译：

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受天气事件控制的南极东部降雪和水稳定同位素变异

了解气候代理记录以保留过去气候的物理特征是重建长期气候条件的前提。水稳定同位素比率（δ ¹⁸ O）构成在冰芯重建温度和气候一种广泛使用的代理。但是，原始的气候信号在降水的形成和冰层之间发生了变化，尤其是在东南极高原等低聚积地区。利用区域大气模型ModèleAtmosphériqueRégional（MAR）表征了南极东部奥罗拉盆地北部（ABN）采集同位素信号的大气条件。模型显示，雪的50％，在天每年不到24积聚^-1。全年降雪并在冬季加剧，4月至9月间降雪总量的64％，导致高于反演温度的冷偏差为-0.86°C，而年均平均值为-29.7°C。大型降雪事件与高压系统有关，高压系统将温暖的海洋气团推向南极内部，这导致+ 2.83°C的温暖偏差。温度δ ¹⁸ Ø的关系，与全球大气模型评估ECHAM5-WISO，主要是由冬季变化的制约，但观察到的斜率为全年有效。三诺δ ¹⁸Ø记录涵盖2004-2014表明，记录在冰芯的异常是由于温暖的冬季暴风雪使沉淀ABN的发生和支持δ解释¹⁸ Ø在这个区域是温度的变化标记相关的大规模大气条件，特别是阻止南环空模式的事件和变化。