Arctic summer temperatures mostly cooled over the last ~7 kyr, owing to decreasing summer insolation. However, knowledge of the winter season is limited in the Arctic paleoclimate literature. Here we develop a composite record of δ¹⁸O from ice wedges—a winter precipitation archive—to reconstruct changes in winter climate in the northwestern Canadian Arctic since ~7.4 kyr b2k. Our record shows a long‐term δ¹⁸O enrichment (+(0.14 ± 0.10)‰ kyr⁻¹), suggesting winter temperatures increased since the mid‐Holocene, a finding that is corroborated by reconstructions from the Siberian Arctic. Winter warming over the last ~7 kyr is consistent with increasing winter insolation and greenhouse gas forcing. This study provides some of the first insights on the sensitivity of winter temperatures in the Canadian Arctic to past, and potentially future, climate forcings, and contributes to a more seasonally holistic understanding of the Arctic system.

中文翻译：

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加拿大北极全新世冬季变暖的冰楔证据

由于夏季日射量的减少，北极的夏季温度在过去约7年内大部分时间都在冷却。但是，北极古气候文献对冬季的知识有限。在这里，我们制定δ复合创纪录的¹⁸ Ø从冰楔，一个冬季降水归档重建，因为〜7.4 KYR B2K在西北加拿大北极地区冬季气候的变化。我们的记录显示长期δ ¹⁸ Ô富集（+（0.14±0.10）‰KYR ^-1），表明自全新世中期以来冬季温度升高，这一发现得到了西伯利亚北极地区重建的支持。在过去约7年内，冬季变暖与冬季日照量的增加和温室气体强迫的增加相一致。这项研究提供了有关加拿大北极地区冬季温度对过去以及未来可能的气候强迫的敏感性的一些初步见解，并有助于对北极系统进行更季节性的整体了解。