Non‐stationary characteristics of intraseasonal precipitation variability in Northeast Asia during the boreal summer,International Journal of Climatology

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Non‐stationary characteristics of intraseasonal precipitation variability in Northeast Asia during the boreal summer
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-05-15 , DOI: 10.1002/joc.6647
Tae‐Gyu Noh ₁ , Sang‐Wook Yeh ₁ , Yu‐Kyung Hyun ₂ , Seung‐On Hwang ₂

Affiliation

In this study, we examined the non‐stationary characteristics of precipitation variability in Korea on intraseasonal timescales during the boreal summer (June–July–August) for 1979–2017 by analysing the European Center for Medium‐Range Weather Forecasts ERA‐interim reanalysis data set. We reconstructed the Korean precipitation variability on intraseasonal timescales in each year using three empirical orthogonal function modes of precipitation anomaly representing northward propagating intraseasonal oscillation from the tropics to subtropics. Then, we compared the reconstructed precipitation variability with the total precipitation variability in Korea. We found that the correlation coefficients between two precipitation variabilities change from year to year, indicating non‐stationary characteristics of intraseasonal precipitation variability contributing to the total precipitation variability. Years, when reconstructed precipitation is highly (less) correlated with total precipitation variability, are characterized by a large (small) amount of total precipitation, an early (late) start of the rainy season and enhanced (reduced) precipitation variability on an intraseasonal timescale. We further examined the reason why the relationship between two variabilities is non‐stationary. A large convective forcing in the western tropical Pacific and the associated atmospheric conditions, including the weakening of Western North Pacific subtropical high with its eastward shift and vertical shear of zonal wind affect the characteristic change of intraseasonal precipitation variability in Korea.

中文翻译：

北方夏季夏季东北亚季节内降水变化的非平稳特征

在这项研究中，我们通过分析欧洲中距离天气预报中心ERA-中期再分析数据，研究了1979-2017年北方夏季（6月-7月-8月）季节内时间尺度上韩国降水变化的非平稳特征。组。我们使用降水异常的三个经验正交函数模式，代表了从热带到亚热带的北向传播的季节内振荡，重建了韩国在季节内时间尺度上的降水变化。然后，我们比较了韩国的重建降水量变化与总降水量变化。我们发现两个降水变化之间的相关系数逐年变化，表明季节内降水变化的非平稳特征导致了总降水变化。当重建的降水与总降水变化高度相关（较少）的年份时，其特征是总降水量大（少量），雨季的提早（晚期）和季节内时间尺度上降水变化的增强（减少）。。我们进一步研究了两个变异之间的关系不稳定的原因。西部热带太平洋和相关大气条件的强烈对流强迫，包括北太平洋西部副热带高压的东移和纬向风的垂直切变减弱，影响了韩国季节内降水变化的特征变化。

更新日期：2020-05-15

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