What Are the Most Important Contributors to Arctic Precipitation—When, Where, and How?

IF 2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Melanie Lauer, Annette Rinke, Susanne Crewell
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引用次数: 0

Abstract

The Arctic climate system is experiencing large changes associated with global warming. Precipitation is a crucial factor linking the atmosphere with other climate compartments, for example, ocean and cryosphere. Using atmospheric reanalysis (ERA5) we assess the role of atmospheric weather systems, that is, atmospheric rivers, cyclones, and fronts. When: Averaged over the whole Arctic (> 70° N), a strong seasonal cycle exists with twice as much precipitation in summer than in winter when frozen precipitation is mainly brought by cyclones. In summer, the highest total precipitation amounts are rather equally contributed by all weather systems. Where: In winter, the Arctic North Atlantic region experiences by far the highest precipitation amounts, whereas in summer precipitation is more evenly distributed over the whole Arctic. How: Overall, cyclones are the most important contributor to precipitation. The highest precipitation intensity occurs when atmospheric rivers, cyclones, and fronts coincide, whereas the lowest precipitation rates occur when precipitation cannot be attributed to any of these weather systems. This residual makes up almost half of the annual snowfall, most of it in the central Arctic, and 25% of rainfall. Marine Cold Air Outbreaks can explain part of the residual. The amount and drivers for light “trace” precipitation requires further investigation.

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什么是北极降水最重要的贡献者——何时、何地、如何?
北极气候系统正在经历与全球变暖相关的巨大变化。降水是将大气与其他气候区(例如海洋和冰冻圈)联系起来的关键因素。利用大气再分析(ERA5),我们评估了大气天气系统的作用,即大气河流、气旋和锋面。当整个北极地区(> 70°N)平均时,夏季降水量是冬季的两倍,冬季主要由气旋带来冰冻降水。在夏季,所有天气系统对最高总降水量的贡献相当平均。其中:在冬季,北极北大西洋地区的降水量是最大的,而在夏季,整个北极地区的降水量分布更为均匀。如何:总的来说,气旋是降水最重要的贡献者。当大气河流、气旋和锋面同时出现时,降水强度最高,而当降水不能归因于任何这些天气系统时,降水率最低。这些残余物几乎占了年降雪量的一半,其中大部分在北极中部,占降雨量的25%。海洋冷空气的爆发可以解释部分残留。轻度“微量”降水的数量和驱动因素需要进一步调查。
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来源期刊
Atmospheric Science Letters
Atmospheric Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.90
自引率
3.30%
发文量
73
审稿时长
>12 weeks
期刊介绍: Atmospheric Science Letters (ASL) is a wholly Open Access electronic journal. Its aim is to provide a fully peer reviewed publication route for new shorter contributions in the field of atmospheric and closely related sciences. Through its ability to publish shorter contributions more rapidly than conventional journals, ASL offers a framework that promotes new understanding and creates scientific debate - providing a platform for discussing scientific issues and techniques. We encourage the presentation of multi-disciplinary work and contributions that utilise ideas and techniques from parallel areas. We particularly welcome contributions that maximise the visualisation capabilities offered by a purely on-line journal. ASL welcomes papers in the fields of: Dynamical meteorology; Ocean-atmosphere systems; Climate change, variability and impacts; New or improved observations from instrumentation; Hydrometeorology; Numerical weather prediction; Data assimilation and ensemble forecasting; Physical processes of the atmosphere; Land surface-atmosphere systems.
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