Atmospheric river lifecycle characteristics shaped by synoptic conditions at genesis,International Journal of Climatology

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Atmospheric river lifecycle characteristics shaped by synoptic conditions at genesis
International Journal of Climatology ( IF 3.5 ) Pub Date : 2021-06-18 , DOI: 10.1002/joc.7258
Sol Kim ₁ , John C. H. Chiang ₁

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The range of synoptic patterns that North Pacific landfalling atmospheric rivers form under are objectively identified using genesis day 500 hPa geopotential height anomalies in a self-organizing map (SOM). The SOM arranges the synoptic patterns to differentiate between two groups of climate modes—the first group with ENSO (El Niño Southern Oscillation), PDO (Pacific Decadal Oscillation), PNA (Pacific North American) and NP (North Pacific index) and the second group with AO (Arctic Oscillation), EPO (East Pacific Oscillation), and WPO (West Pacific Oscillation). These two groups have their positive and negative modes organized in opposite corners of the SOM. The ARs produced in each of the synoptic patterns have distinct lifecycle characteristics (such as genesis and landfall location, duration, velocity, meridional/zonal movement) and precipitation impacts (magnitude and spatial distribution). The conditions that favour AR trajectories closer to the tropics tend to produce higher amounts of precipitation. The large-scale circulation associated with AR genesis shows a close relationship between the genesis location and the location and intensity of the upper-level jet in the west/central pacific as well as anomalous, low-level southwesterly winds in the east pacific.

中文翻译：

成因天气条件塑造的大气河流生命周期特征

北太平洋登陆大气河流形成的天气模式范围是使用自组织图（SOM）中的创世日 500 hPa 位势高度异常客观确定的。SOM 排列天气模式以区分两组气候模式——第一组是 ENSO（厄尔尼诺南方涛动）、PDO（太平洋年代际涛动）、PNA（北美太平洋）和 NP（北太平洋指数），第二组是AO（北极涛动）、EPO（东太平洋涛动）和 WPO（西太平洋涛动）组。这两组在 SOM 的相对角落组织了它们的积极和消极模式。在每种天气模式中产生的 AR 具有不同的生命周期特征（例如起源和登陆位置、持续时间、速度、经向/纬向运动）和降水影响（幅度和空间分布）。有利于靠近热带地区的 AR 轨迹的条件往往会产生更多的降水。与AR成因相关的大尺度环流表明，成因位置与西太平洋/中太平洋高层急流的位置和强度以及东太平洋异常低层西南风的位置和强度密切相关。

更新日期：2021-06-18

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