极地低气压对典型气候模式分辨率的敏感性

IF 2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Marta Moreno-Ibáñez, John J. Cassano, Suzanne L. Gray, Mark Seefeldt
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引用次数: 0

摘要

极地低压(PLs)是强烈的海洋中尺度气旋,通常在海洋冷空气爆发期间形成。本研究的目的是确定在气候模拟中正确表示PLs所需的大气模式水平分辨率。使用天气研究与预报(WRF)模式进行了三次模拟,网格间距分别为50、25和12.5公里。使用客观和主观相结合的跟踪方法跟踪PLs。随着模型分辨率的增加,每次模拟中检测到的PLs数量增加,其平均等效半径减小。与三种PL径迹气候学的比较表明,命中率随大气模式分辨率的增加而增加。与PLs相关的面积最大10 m风速和面积平均地表感热通量的寿命最大值在高分辨率模拟中比在低分辨率模拟中平均分别大12%和20%。在25 km和12.5 km模拟中,面积最大1 h累积降水的寿命最大值分别比低分辨率模拟大67%和133%。我们的结论是,通过将大气模式的分辨率从50 km提高到25 km,可以获得更好的PLs表示,但进一步将分辨率提高到12.5 km不会导致实质性的改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sensitivity of the Representation of Polar Lows to Typical Climate Model Resolutions

Sensitivity of the Representation of Polar Lows to Typical Climate Model Resolutions

Sensitivity of the Representation of Polar Lows to Typical Climate Model Resolutions

Sensitivity of the Representation of Polar Lows to Typical Climate Model Resolutions

Polar lows (PLs) are intense maritime mesoscale cyclones that often form during marine cold air outbreaks. The objective of this study is to determine the atmospheric model horizontal resolution needed to correctly represent PLs for climate modelling. Three simulations have been conducted with the Weather Research and Forecasting (WRF) model using grid spacings of 50, 25 and 12.5 km. PLs have been tracked using a combination of objective and subjective tracking methods. The number of PLs detected in each simulation increases, and their average equivalent radius decreases, as the model resolution increases. A comparison against three PL track climatologies shows that the hit rate increases with increasing resolution of the atmospheric model. The lifetime maxima of the area-maximum 10-m wind speed and area-average surface sensible heat fluxes associated with PLs are on average 12% and 20% larger, respectively, in the higher-resolution simulations than in the lower-resolution one. The lifetime maximum of the area-maximum 1-h accumulated precipitation is 67% and 133% larger in the 25- and 12.5-km simulations, respectively, than in the lower-resolution one. We conclude that a better representation of PLs can be obtained by increasing the resolution of atmospheric models from 50 to 25 km, but further increasing the resolution to 12.5 km will not result in a substantial improvement.

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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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