QBO Modulation of the MJO‐Related Precipitation in East Asia

Kim, Hera; Son, Seung Woo; Yoo, Changhyun

doi:10.1029/2019jd031929

Cited by 31 publications

(6 citation statements)

References 35 publications

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“…The QBO can alter the teleconnections of the MJO [86][87][88] , and thus by extension, its extreme impacts. For example, when the QBO winds are easterly, there is stronger and more organized precipitation over east Asia during certain MJO phases 89 and stronger MJO-related modulations of the amplitude and structure of the North Pacific storm track 90 . Further investigation into if and how the QBO may modify other MJO-related extremes, e.g., ref.…”

mentioning

confidence: 99%

Stratospheric drivers of extreme events at the Earth’s surface

Domeisen

Butler

2020

Commun Earth Environ

120

106

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The stratosphere, the layer of the atmosphere at heights between 10-50 km, is an important source of variability for the weather and climate at the Earth’s surface on timescales of weeks to decades. Since the stratospheric circulation evolves more slowly than that of the troposphere below, it can contribute to predictability at the surface. Our synthesis of studies on the coupling between the stratosphere and the troposphere reveals that the stratosphere also contributes substantially to a wide range of climate-related extreme events. These extreme events include cold air outbreaks and extreme heat, air pollution, wildfires, wind extremes, and storm clusters, as well as changes in tropical cyclones and sea ice cover, and they can have devastating consequences for human health, infrastructure, and ecosystems. A better understanding of the vertical coupling in the atmosphere, along with improved representation in numerical models, is therefore expected to help predict extreme events on timescales from weeks to decades in terms of the event type, magnitude, frequency, location, and timing. With a better understanding of stratosphere-troposphere coupling, it may be possible to link more tropospheric extremes to stratospheric forcing, which will be crucial for emergency planning and management.

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mentioning

confidence: 99%

Stratospheric drivers of extreme events at the Earth’s surface

Domeisen

Butler

2020

Commun Earth Environ

120

106

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“…As the MJO propagates, it influences the midlatitude circulation by exciting the Rossby wave train 14,15 . Over East Asia, which is on the main pathway of the Rossby wave train, precipitation, temperature, and atmospheric circulations are significantly modulated by the MJO [16][17][18] , affecting local air pollution. Figure 1a presents PM10 climatology in China and Korea during the boreal winter (December-February).…”

Section: Mainmentioning

confidence: 99%

Tropical modulation of East Asia air pollution

Jung

Son

Kim

et al. 2020

Preprint

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Given the high population density and serious air pollution problems, understanding and predicting air pollution in East Asia are of great importance. Here, we show that the day-to-day variability of East Asia air pollution in winter is remotely controlled by the convection over the tropical Indian Ocean and western Pacific, the so-called Madden–Julian oscillation (MJO), through its extratropical teleconnections. In particular, the concentration of particulate matter with aerodynamic diameter less than 10 micron (PM10) becomes significantly high when the tropical convection is suppressed over the Indian Ocean (MJO phases 5–6). In contrast, PM10 concentration becomes significantly low when the convection is enhanced there (MJO phase 1–2). The station-averaged PM10 difference between the two MJO phases reaches up to 47% of the daily PM10 variability, indicating that the MJO is a primary source of wintertime subseasonal variability of East Asia PM10 concentration. We also show that PM10 anomaly typically lags the tropical convection by one to two weeks. This opens a new window of opportunity for subseasonal PM10 prediction in East Asia.

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“…MJO actives in different phases will induce different influences on precipitation (Jia et al, 2011;Liu & Yang, 2010). Systemic and substantial changes in intensity and spatial pattern of precipitation can be observed along with the MJO activity propagating from the Indian Ocean to the central Pacific (He et al, 2011;Jeong et al, 2008;Kim et al, 2020;Liu & Yang, 2010). Precipitation over southern China increases significantly when MJO is active over the Indian Ocean, whereas it decreases pronouncedly when active MJO enters the western Pacific (He et al, 2011;Jia et al, 2011;Liu & Yang, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have found that some other climate systems will also modulate the effects of MJO on winter precipitation over southern China. Kim et al (2020) found that precipitation anomalies over southern China and Japan induced by MJO are approximately 40% stronger in the easterly phase of Quasi-Biennial Oscillation (QBO) than in its westerly phase. Significantly enhanced precipitation is observed over southern China when MJO convection is over the Indian Ocean in El Niño winter, but it only occurs in Zhejiang Province and adjacent areas in the La Niña winter (Chen et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Intraseasonal variations of precipitation over southern China during boreal winter and their two primary influencing factors

Chen,

et al. 2023

Intl Journal of Climatology

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This paper utilizes reanalysis data and statistical methods to elucidate the physical mechanisms of intraseasonal variations of precipitation over southern China during the boreal winter, as well as the two primary factors influencing these variations. Anomalous southerly (northerly) wind over southern China will result in the strong moisture convergence (divergence) in enhanced (suppressed) scenarios, and the stronger positive (negative) horizontal advection of absolute vorticity at upper troposphere induces the anomalous ascending (descending) motion in enhanced (suppressed) scenarios. The Madden–Julian oscillation (MJO) in the tropics and a wave train over the North Atlantic and Eurasia with four activity centres in the mid–high latitudes (referred as NAE‐wave train) are the two primary factors that modulate the intraseasoanl precipitation over southern China. The intraseasonal circulation induced by MJO and NAE‐wave train exhibits distinct features, resulting in different physical mechanisms of their influences. The moisture flux divergence anomalies over southern China associated with MJO mainly stem from the meridional moisture convergence, whereas the meridional moisture advection is the first contributor in the influence of NAE‐wave train. The anomalous vorticity advection at upper troposphere associated with MJO is primarily influenced by the meridional advection, but that associated with NAE‐wave train is dominated by the zonal advection. Anomalous precipitation induced by MJO is concentrated mainly over South China, while that caused by NAE‐wave train is primarily located in the mid–lower Yangtze River basin. Therefore, different phases locking of MJO and NAE‐wave train could lead to various precipitation anomalies over southern China.

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QBO Modulation of the MJO‐Related Precipitation in East Asia

Cited by 31 publications

References 35 publications

Stratospheric drivers of extreme events at the Earth’s surface

Stratospheric drivers of extreme events at the Earth’s surface

Tropical modulation of East Asia air pollution

Intraseasonal variations of precipitation over southern China during boreal winter and their two primary influencing factors

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