Based on statistical analyses and Arctic Oscillation (AO) and the Pacific-North American pattern (PNA) induced climate anomalies in the 2001–2020 interval, it has been found that these climate modes drastically influence the fire danger (PFIv2) in differing ways across coastal and inland regions. The AO induces higher fire risk in northern Eurasia and central North America, whereas the PNA increases the fire danger across southern Asia and western North America. Moreover, fires have been predominantly identified, up to 70%, during the positive phases of AO and PNA northward of 50°N, in particular over Alaska, Baltic States and eastern Asia. For coincident positive AO and negative PNA days, a large number of fires have been identified over northwestern North America and northern Eurasia. Spectral analyses demonstrate that weather anomalies related to AO and PNA lead fire danger by 10–20 days, and both modes are significantly correlated to PFIv2 over north America and most of Eurasia. Despite some drawbacks related to the fire danger methods currently applied (PFI and FWI), it is demonstrated that the influence of AO and PNA on potential environmental driven-fires can be anticipated, in some locations on almost 90% of days. Fire danger forecasts are urgently needed and the understanding of factors and conditions, which are able to modify the environmental susceptibility to fire development, are crucial for adequate management to reduce the harmful effects of fire. In this sense, our results reveal that a better prediction of the fire season can be achieved by advanced assessment of the PNA and AO behavior, and shed light on the need to investigate the impact of other modes of climate variability upon wildfire frequency and severity.

基于统计分析和北极涛动 (AO) 和太平洋-北美模式 (PNA) 在 2001-2020 年期间引起的气候异常，人们发现这些气候模式以不同方式显着影响火灾危险 (PFIv2)沿海和内陆地区。AO 在欧亚大陆北部和北美中部引起更高的火灾风险，而 PNA 增加了整个亚洲南部和北美西部的火灾危险。此外，在北纬 50°以北的 AO 和 PNA 的正阶段，特别是在阿拉斯加、波罗的海国家和东亚上空，主要发现了火灾，高达 70%。在 AO 正日和 PNA 负日同时发生的情况下，已经在北美西北部和欧亚大陆北部发现了大量火灾。光谱分析表明，与 AO 和 PNA 相关的天气异常会导致火灾危险提前 10-20 天，并且两种模式都与北美和欧亚大陆大部分地区的 PFIv2 显着相关。尽管目前应用的火灾危险方法（PFI 和 FWI）存在一些缺点，但事实证明，在某些地方几乎 90% 的天数，可以预期 AO 和 PNA 对潜在环境驱动火灾的影响。迫切需要预测火灾危险，了解能够改变环境对火灾发展的敏感性的因素和条件，对于进行适当管理以减少火灾的有害影响至关重要。从这个意义上说，我们的结果表明，可以通过对 PNA 和 AO 行为的高级评估来更好地预测火灾季节，