中国南方夏季降水模式下季内降水向北和向南传播的对比关系

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Hao Pan, Hong-Li Ren, Jieru Ma, Yuwen Wang
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引用次数: 0

摘要

季内降水传播对东亚夏季雨带的分季节预报至关重要。本研究以华南夏季降水模式(SCSRP)为背景,首先识别了季内北向和南向传播类型,然后深入研究了它们在 20-90 天季内时间尺度上的传播特征和影响因素。结果表明,在SCSRP期间,北向传播类型在大多数情况下是主要的,其特点是低层西南风、外送长波辐射和500-hPa位势高度(Z500)的异常信号向长江流域强烈北向传播。在向南传播类型中,Z500异常信号主要随低层东北风从西北大陆地区向华南降水异常中心明显向南传播。我们进一步揭示了季内降水的向北传播类型与北半球夏季季内振荡(BSISO)的第一模式和东亚-西北太平洋季内振荡(EAWNP ISO)的动态相关,前者在第5和第8阶段在华南上空表现出明显的降水异常,后者在第3和第5阶段表现出明显的降水异常。相比之下,向南传播型主要受中高纬度异常环流波列的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Contrasting northward and southward propagations of intraseasonal precipitation under the southern China summer rainfall pattern
Propagations of intraseasonal precipitation are essential for subseasonal prediction of East Asian summer rainbelt. In this study, under the background of the southern China summer rainfall pattern (SCSRP), the intraseasonal northward and southward propagation types are first identified and then their propagation characteristics and influencing factors on the 20–90-day intraseasonal timescale are deeply examined. Results show that the northward propagation type, being primary during the SCSRP in its most cases, features robust northward propagation of anomalous signals in the low-level southwesterly wind, outgoing longwave radiation, and 500-hPa geopotential height (Z500) towards the Yangtze River basin. For the southward propagation type, anomalous signals of Z500 with low-level northeasterly wind mainly exhibit a clear southward propagation from the northwest continental area, towards the precipitation anomaly center in southern China. We further reveal that the northward propagation type of intraseasonal precipitation is dynamically related to the first mode of boreal summer intraseasonal oscillation (BSISO) that exhibits significant precipitation anomalies over the southern China in its Phases 5 and 8, and to the intraseasonal oscillation in the East Asia-Western North Pacific (EAWNP ISO) that shows significant precipitation anomalies in its Phases 3 and 5. In contrast, the southward propagation type is primarily influenced by the wave trains of anomalous circulation over mid-to-high latitudes.
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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