A Spring Barrier for Regional Predictions of Summer Arctic Sea Ice

A Spring Barrier for Regional Predictions of Summer Arctic Sea Ice
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夏季北极海冰区域预测的春季屏障

DOI:
10.1029/2019gl082947
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发表时间:
2019
影响因子:
5.2
通讯作者:
E. Blanchard‐Wrigglesworth
E. Blanchard‐Wrigglesworth
中科院分区:
地球科学1区
文献类型:
--
作者:
M. Bushuk;D. Bonan;Michael Winton;E. Blanchard‐Wrigglesworth

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季节预报系统可以提前4个月巧妙地预报夏季北极海冰。然而,对于某些地区来说,春季的可预测性障碍导致在5月之前初始化的预测不那么熟练。由于这一障碍只记录在几个大气环流模式(GCM),我们评估GCM参与第5阶段的耦合模式相互比较项目。我们首先显示海冰体积巧妙地预测夏季海冰面积(SIA),并具有类似的技能,一个完美的模式实验。鉴于这一结果,我们评估区域SIA的可预测性在每个GCM,并找到一个普遍的可预测性障碍,在春末。对于SIA在每个夏季目标月在边缘海的北极盆地,一个显着的下降,预测技能发生在6月至5月在每个GCM。这表明在6月1日之后初始化的夏季海冰预报将比之前初始化的预报具有更好的预报技能。
Seasonal forecast systems can skillfully predict summer Arctic sea ice up to 4 months in advance. For some regions, however, there is a springtime predictability barrier that causes forecasts initialized prior to May to be less skillful. Since this barrier has only been documented in a few general circulation models (GCMs), we evaluate GCMs participating in phase 5 of the Coupled Model Intercomparison Project. We first show sea ice volume skillfully predicts summer sea ice area (SIA) and has similar skill to a perfect model experiment. Given this result, we assess regional SIA predictability across each GCM and find a universal predictability barrier in late spring. For SIA at each summer target month in the marginal seas of the Arctic basin, a notable drop in prediction skill occurs from June to May in each GCM. This suggests summer sea ice forecasts initialized after 1 June will have substantially better prediction skill than forecasts initialized before.
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发表时间: 2014-11-16
影响因子: 5.2
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