早期融雪和极地湍流动力变化共同影响着最近西伯利亚的极端火灾季节，这一观点由荷兰阿姆斯特丹自由大学
研究表明，早期的融雪和西伯利亚东北部异常的北极锋湍流创造了异常温暖和干燥的地表条件，随之而来的是强异常的闪电和火灾活动。自1966年以来，每隔十年，春季融雪期就会提前1.7天开始。此外，在过去的40年里，北极锋湍流在夏季出现的频率增加了两倍多。这些相互关联的气候驱动因素促进了西伯利亚东部的极端火灾活动的发生，包括火灾活动的北移，这一现象可能会加速富碳的永久冻土泥炭地的退化。
据介绍，2019年、2020年和2021年的夏天，在创纪录的春季和夏季高温的推动下，西伯利亚东北部经历了前所未有的火灾活动。这些火灾大多数发生在北极圈内的永久冻土泥炭地。
附：英文原文
Title: Early snowmelt and polar jet dynamics co-influence recent extreme Siberian fire seasons
Author: Rebecca C. Scholten, Dim Coumou, Fei Luo, Sander Veraverbeke
Issue&Volume: 2022-11-03
Abstract: The summers of 2019, 2020, and 2021 experienced unprecedented fire activity in northeastern Siberia, driven by record high spring and summer temperatures. Many of these fires burned in permafrost peatlands within the Arctic Circle. We show that early snowmelt together with an anomalous Arctic front jet over northeastern Siberia promoted unusually warm and dry surface conditions, followed by anomalously high lightning and fire activity. Since 1966, spring snowmelt has started 1.7 days earlier each decade. Moreover, Arctic front jet occurrences in summer have more than tripled in frequency over the last 40 years. These interconnected climatological drivers promote extreme fire activity in eastern Siberia, including a northward shift of fires, which may accelerate the degradation of carbon-rich permafrost peatlands.
DOI: abn4419
Source: https://www.science.org/doi/10.1126/science.abn4419