测量对流组织

IF 3 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of the Atmospheric Sciences Pub Date : 2023-09-26 DOI:10.1175/jas-d-23-0103.1
Giovanni Biagioli, Adrian Mark Tompkins
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引用次数: 0

摘要

有组织的深层对流云系统通常与高影响天气有关,这种系统的变化可能对气候敏感性有影响。这促使了许多组织指数的推导,这些指数试图在模式和观测中测量深层对流聚集的水平。在这里,我们对现有的方法进行了全面的回顾,并强调了它们的一些相对缺点,例如仅在相对意义上测量组织,偏向于特定的空间尺度,或者对计算算法的细节非常敏感。一个广泛使用的度量,I org,使用对流风暴之间最近邻距离的统计来解决第一个问题,但我们在这里表明,它对β -中尺度以外的组织不敏感,并且非常依赖于实施的细节。因此,我们引入了一种新的互补度量,基于全对对流风暴距离的lorg,它也是一种可以识别规则、随机和聚集云场景的绝对度量。在大多数应用中,它对空间尺度线性敏感,对实现方法具有鲁棒性。我们还推导出适合网格数据的离散形式,并提供校正,以考虑循环边界条件和非等宽高比的有限开放边界域。我们演示了使用具有理想合成配置的度量,以及热带地区的模型输出和卫星降雨检索。我们声称,这个新的度量有效地补充了现有的指标家族,可以帮助理解跨空间尺度的对流组织。
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Measuring convective organization
Abstract Organized systems of deep convective clouds are often associated with high-impact weather and changes in such systems may have implications for climate sensitivity. This has motivated the derivation of many organization indices that attempt to measure the level of deep convective aggregation in models and observations. Here we conduct a comprehensive review of existing methodologies and highlight some of their relative drawbacks, such as only measuring organization in a relative sense, being biased towards particular spatial scales, or being very sensitive to the details of the calculation algorithm. One widely used metric, I org , uses statistics of nearest-neighbor distances between convective storms to address the first of these concerns, but we show here that it is insensitive to organization beyond the β -mesoscale and very contingent on the details of the implementation. We thus introduce a new and complementary metric, L org , based on all-pair convective storm distances, which is also an absolute metric that can discern regular, random and clustered cloud scenes. It is linearly sensitive to spatial scale in most applications and robust to the implementation methodology. We also derive a discrete form suited to gridded data and provide corrections to account for cyclic boundary conditions and finite, open boundary domains of non-equal aspect ratios. We demonstrate the use of the metric with idealized synthetic configurations, as well as model output and satellite rainfall retrievals in the tropics. We claim that this new metric usefully supplements the existing family of indices that can help understand convective organization across spatial scales.
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来源期刊
Journal of the Atmospheric Sciences
Journal of the Atmospheric Sciences 地学-气象与大气科学
CiteScore
0.20
自引率
22.60%
发文量
196
审稿时长
3-6 weeks
期刊介绍: The Journal of the Atmospheric Sciences (JAS) publishes basic research related to the physics, dynamics, and chemistry of the atmosphere of Earth and other planets, with emphasis on the quantitative and deductive aspects of the subject. The links provide detailed information for readers, authors, reviewers, and those who wish to submit a manuscript for consideration.
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