The Increasing Efficiency of the Poleward Energy Transport Into the Arctic in a Warming Climate
The Increasing Efficiency of the Poleward Energy Transport Into the Arctic in a Warming Climate
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DOI：
10.1029/2022gl100834
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发表时间：
2023-01
影响因子：
5.2
通讯作者：
C. Cardinale;B. Rose
中科院分区：
文献类型：
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作者：
C. Cardinale;B. Rose
本研究量化了在地球系统模式大集合的RCP8.5变暖情景下，对流层能量输送（Ftrop）的变化以及Ftrop加热地表的效率对北极冬季地表变暖的贡献。衡量这种效率的指标Etrop，测量的是由异常净地表通量（NSF）平衡的异常Ftrop的比例。在天气尺度事件中确定了Etrop的驱动因素，在此类事件中Ftrop是NSF的主要驱动因素。Etrop对Ftrop的垂直结构和预先存在的北极对流层下层稳定性（LTS）敏感。在RCP8.5情景下，冬季平均Ftrop从95.1瓦/平方米下降到85.4瓦/平方米，而Etrop增加了5.7%，这可能是由北极LTS降低所驱动，表明Ftrop与地表能量收支之间的耦合增强。Ftrop降低和效率提高的净影响是对冬季地表加热产生了+0.7瓦/平方米的贡献。
This study quantifies the contribution to Arctic winter surface warming from changes in the tropospheric energy transport (Ftrop) and the efficiency with which Ftrop heats the surface in the RCP8.5 warming scenario of the Community Earth System Model Large Ensemble. A metric for this efficiency, Etrop, measures the fraction of anomalous Ftrop that is balanced by an anomalous net surface flux (NSF). Drivers of Etrop are identified in synoptic‐scale events during which Ftrop is the dominant driver of NSF. Etrop is sensitive to the vertical structure of Ftrop and pre‐existing Arctic lower‐tropospheric stability (LTS). In RCP8.5, winter‐mean Ftrop decreases from 95.1 to 85.4 W m−2, while Etrop increases by 5.7%, likely driven by decreased Arctic LTS, indicating an increased coupling between Ftrop and the surface energy budget. The net impact of decreasing Ftrop and increasing efficiency is a positive 0.7 W m−2 contribution to winter‐season surface heating.