Fire remains one of the main natural disturbance factors in the European boreal zone and understanding climatic forcing on fire activity is important for projecting effects of climate change on ecosystem services in this region. We analyzed records of annually burned areas in 16 administrative regions of the European boreal zone (countries or administrative units within countries) and fire weather variability to test for their spatio-temporal patterns over the 1901-2017 period.

Over the 1992-2017 period, the region exhibited large variability in forest fire activity with the fire cycles varying from ~1600 (St. Petersburg region) to ~37000 years (Finland). The clustering of administrative units in respect to their burned area, suggested the presence of sub-regions with synchronous annual variability in burned areas. Large fire years (LFYs) in each of the clusters were associated with the development of the high pressure cell over or in immediate proximity of the regions in question in July, indicating climatic forcing of LFYs. Contingency analysis indicated that there was no long-term trend in the synchrony of LFYs observed simultaneously in several administrative units. We documented a trend towards higher values of Monthly Drought Code (MDC) for the months of April and May in the western (April) and northern (April and May) sections. The significant positive correlation between biome-wide fire activity index and June SNAO (Summer North Atlantic Oscillation) (r = 0.53) pointed to the importance of large-scale atmospheric circulation, in particular the summer European blocking pattern, in controlling forest fires across EBZ. The forest fire activity of the European boreal zone remains strongly connected to the annual climate variability. Higher frequency of strongly positive SNAO states in the future will likely synchronize years with a large area burned across the European boreal zone.

火灾仍然是欧洲北方地区的主要自然干扰因素之一，了解火灾活动的气候强迫对于预测该地区气候变化对生态系统服务的影响至关重要。我们分析了欧洲寒带区16个行政区域（国家或地区内的国家或行政单位）的年度燃烧区域记录和火灾天气变化，以测试其1901-2017年期间的时空格局。

在1992年至2017年期间，该地区的森林火灾活动表现出很大的变异性，火灾周期从〜1600年（圣彼得堡地区）到〜37000年（芬兰）不等。各行政单位关于其燃烧面积的聚类表明，在燃烧区中存在具有同步年度变化的次区域。每个集群中的大火年（LFY）与7月在所讨论区域上方或附近的高压电池的发展有关，这表明LFY的气候强迫。权变分析表明，在几个行政单位中同时观察到的LFY同步性没有长期趋势。我们记录了西部（四月）和北部（四月和五月）地区4月和5月月份的每月干旱代码（MDC）值较高的趋势。生物群落范围的火灾活动指数与6月SNAO（夏季北大西洋涛动）之间的显着正相关（r = 0.53）表明，大规模大气环流，特别是夏季欧洲的阻塞模式，对于控制整个EBZ地区的森林火灾十分重要。 。欧洲北方地区的森林火灾活动仍然与年度气候变化密切相关。未来，SNAO州表现出高度积极的态势，可能会与欧洲北部寒带大面积烧毁的年份保持同步。生物群落范围的火灾活动指数与6月SNAO（夏季北大西洋涛动）之间的显着正相关（r = 0.53）表明，大规模大气环流，特别是夏季欧洲的阻塞模式，对于控制整个EBZ地区的森林火灾十分重要。 。欧洲北方地区的森林火灾活动仍然与年度气候变化密切相关。未来，SNAO州表现出高度积极的态势，可能会与欧洲北部寒带大面积烧毁的年份保持同步。生物群落范围的火灾活动指数与6月SNAO（夏季北大西洋涛动）之间的显着正相关（r = 0.53）表明，大规模大气环流，特别是夏季欧洲的阻塞模式，对于控制整个EBZ地区的森林火灾十分重要。 。欧洲北方地区的森林火灾活动仍然与年度气候变化密切相关。未来，SNAO州表现出高度积极的态势，可能会与欧洲北部寒带大面积烧毁的年份保持同步。