Link Between Autumnal Arctic Sea Ice and Northern Hemisphere Winter Forecast Skill

Link Between Autumnal Arctic Sea Ice and Northern Hemisphere Winter Forecast Skill
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北极秋季海冰与北半球冬季预报技能之间的联系

DOI:
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发表时间:
2020
影响因子:
5.2
通讯作者:
F. Doblas
F. Doblas
中科院分区:
地球科学1区
文献类型:
--
作者:
J. C. A. Navarro;Pablo Ortega;L. Batté;D. Smith;P. Bretonnière;V. Guemas;F. Massonnet;V. Sicardi;V. Torralba;É. Tourigny;F. Doblas

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动力学预报系统在热带外大陆冬季预报中具有低到中等的技能。在这里,我们使用四种最先进的预报系统评估了北方半球高纬度和中纬度地区的多模型预测技能。我们的主要目标是量化11月期间北极海冰状态对海平面气压(SLP),表面温度和降水技能的影响。11月巴伦支海和喀拉海海冰的年际变化与欧亚大陆地区12月至2月(DJF)预测技能的重要部分有关。我们进一步表明,这些地区与海冰相关的技能伴随着俄罗斯西部DJF SLP的增强技能,由海冰-大气遥相关机制建立。遥相关是最强的大气阻塞条件在斯堪的纳维亚半岛/俄罗斯西部在11月减少系统的SLP偏差,是目前在所有系统。
Dynamical forecast systems have low to moderate skill in continental winter predictions in the extratropics. Here we assess the multimodel predictive skill over Northern Hemisphere high latitudes and midlatitudes using four state‐of‐the‐art forecast systems. Our main goal was to quantify the impact of the Arctic sea ice state during November on the sea level pressure (SLP), surface temperature, and precipitation skill during the following winter. Interannual variability of the November Barents and Kara Sea ice is associated with an important fraction of December to February (DJF) prediction skill in regions of Eurasia. We further show that skill related to sea ice in these regions is accompanied with enhanced skill of DJF SLP in western Russia, established by a sea ice‐atmosphere teleconnection mechanism. The teleconnection is strongest when atmospheric blocking conditions in Scandinavia/western Russia in November reduce a systematic SLP bias that is present in all systems.
DOI: 10.1007/s00382-017-3624-y
发表时间: 2017-06
期刊: Climate Dynamics
影响因子: 4.6
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