Climate variability of heat waves and their associated diurnal temperature range variations in Taiwan

Kueh, Mien-Tze; Lin, Chuan-Yao; Chuang, Yin-Jui; Yang, Shangjin; Chien, Yi-Yun

doi:10.1088/1748-9326/aa70d9

Cited by 28 publications

(21 citation statements)

References 39 publications

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“…Climatologically, the WNPSH jumped poleward to the north of 20°N in early June following the Meiyu-Baiu-Changma rainy season and continued to the north of 30°N in mid-late July following the rainy season over Northeast Asia (NEA). The meridional movement of the WNPSH not only determined the position of the EASM rainy belt (Ninomiya and Kobayashi 1999;Lu 2002;Zhou and Yu 2005) but also caused heat waves in the affected regions, especially over East China and Southern Japan (Enomoto et al 2003;Ding et al 2010;Chen and Lu 2015;Kueh et al 2017). Thus, the meridional position of the WNPSH has been widely considered in the seasonal prediction of the EASM (Wang et al 2013;Yim et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Record-Breaking Northward Shift of the Western North Pacific Subtropical High in July 2018

Liu

Zhu

et al. 2019

Journal of the Meteorological Society of Japan

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The northward shift of the Western North Pacific Subtropical High (WNPSH) in July 2018 broke the historical record since 1958 and resulted in extreme heat waves and casualties across Northeast Asia (NEA). In the present work, we associated this extreme WNPSH anomaly with the anomalies of barotropic anticyclone above NEA originating from the strongest positive tripole pattern of sea surface temperature anomaly (SSTA) in the North Atlantic in July. Both data analysis and numerical experiments indicated that the positive tripole SSTA pattern could produce an upper-tropospheric wave source over Europe, which stimulated an eastward propagating wave train along the subpolar westerly jet over the Eurasian Continent. When its anticyclonic node reached NEA, the WNPSH started to shift northward. After the cyclonic node in the circulation anomaly encountered the Tibetan Plateau (TP), atmospheric diabatic heating was enhanced over the eastern TP, initiating another subtropical wave train, which furthered the northward shift of the WNPSH. Therefore, the wave source over Europe was critical for the northward shift of the WNPSH in July, connecting the tripole SSTA pattern in the North Atlantic with the WNPSH anomaly and maintaining the downstream effects of thermal forcing over the eastern TP on the East Asian summer monsoon.

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Section: Introductionmentioning

confidence: 99%

Record-Breaking Northward Shift of the Western North Pacific Subtropical High in July 2018

Liu

Zhu

et al. 2019

Journal of the Meteorological Society of Japan

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“…Indicators to quantify the risks of heatwave vary and most of them are based on daily maximum temperature 9 , 10 , 12 Health risks due to daytime heatwave can substantially increase if human body does not get a break from the heat during night 13 . Cooler nighttime temperature provides comfort from the daytime heat.…”

Section: Introductionmentioning

confidence: 99%

A sixfold rise in concurrent day and night-time heatwaves in India under 2 °C warming

Mukherjee

Mishra

2018

Sci Rep

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Heatwaves with severe impacts have increased and projected to become more frequent under warming climate in India. Concurrent day and nighttime heatwaves can exacerbate human discomfort causing high morbidity and mortality; however, their changes in the observed and projected climate remain unrecognized. Here using observations and model simulations from climate of 20th century plus (C20C+) detection and attribution (D&A) and coupled model intercomparison project 5 (CMIP5) projects, we show that 1 and 3-day concurrent hot day and hot night (CHDHN) events have significantly increased during the observed climate in India. Our results show that the anthropogenic emissions contribute considerably to the increase of 1 and 3-day CHDHN events in India. The frequency of 3-day CHDHN events is projected to increase 12-fold of the current level by the end of 21st century and 4-fold by the mid 21st century under the high emission pathway of RCP 8.5. The increase in 3-day CHDHN events can be limited to only 2-fold by the end of 21st century under low emission scenario of RCP 2.6. One and 3-day CHDHN events are projected to increase by 4, 6, and 8 folds of the current level in India under the 1.5, 2, and 3 °C warming worlds, respectively. Restricting global mean temperature below 1.5° from the pre-industrial level can substantially reduce the risk of 1 and 3-day CHDHN events and associated implications in India.

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“…This partly explains why extreme hot events fail to persist through day and night as they do during compound hot extremes. A diurnal cycle of anomalous anticyclones during independent hot extremes was also reported in other studies focusing on events in other regions (Kueh et al ., 2017; Hong et al ., 2018). Moreover, during independent hot days and nights, there is no clear signal of paired anomalous diabatic heating in both the north and south of the Yangtze River Valley, as observed during compound hot extremes.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms for regional compound hot extremes in the mid‐lower reaches of the Yangtze River

Liu

2020

Intl Journal of Climatology

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Hot temperature extremes, particularly during summer, impose severe adverse effects on human health and natural systems. Although considerable attention has been paid to individual hot days and nights, little is known about mechanisms leading to compound hot extremes that combine daytime and nighttime heat. This important type of hot extreme has occurred frequently in the populated mid‐lower reaches of the Yangtze River during the past three to four decades. Through composite analysis, dynamic–thermodynamic processes leading to the occurrence of compound hot extremes are investigated. Results show that an anomalous anticyclone, exhibiting a quasi‐barotropic structure and persisting through day and night, is a prerequisite for the occurrence of compound hot extremes in the mid‐lower reaches of the Yangtze River. The anomalous anticyclone reduces cloud cover and increases solar radiation, causing extreme daytime high temperature. Simultaneously, a descending branch within the column of the anomalous anticyclone enhances local adiabatic heating. This descending branch and resultant adiabatic heat are sustained and further strengthened by anomalous descending motions as part of vertical cells associated with positive precipitation anomalies to the north and south of the anticyclone. During compound hot extremes, intensified southerlies transport additional water vapour toward the study area, helping to establish a stable atmospheric stratification in the low troposphere. This low‐level stable moist layer plays a particularly important role to offset nighttime radiative cooling and, therefore, elevates nighttime low temperatures to form compound hot extremes. Consequently, compound hot extremes in the study area are hot‐humid in nature.

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Climate variability of heat waves and their associated diurnal temperature range variations in Taiwan

Cited by 28 publications

References 39 publications

Record-Breaking Northward Shift of the Western North Pacific Subtropical High in July 2018

Record-Breaking Northward Shift of the Western North Pacific Subtropical High in July 2018

A sixfold rise in concurrent day and night-time heatwaves in India under 2 °C warming

Mechanisms for regional compound hot extremes in the mid‐lower reaches of the Yangtze River

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