Vol.34, NO.5, 2023
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Article Navigation >  Journal of Applied Meteorological Science  > 2023  >  34(5): 527-539
Peng Jingbei, Sun Shuqing, Lin Dawei. The extreme hot event along the Yangtze Basins in August 2022. J Appl Meteor Sci, 2023, 34(5): 527-539. DOI:  10.11898/1001-7313.20230502.
Citation: Peng Jingbei, Sun Shuqing, Lin Dawei. The extreme hot event along the Yangtze Basins in August 2022. J Appl Meteor Sci, 2023, 34(5): 527-539. DOI:  10.11898/1001-7313.20230502.
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The Extreme Hot Event Along the Yangtze Basins in August 2022

DOI: 10.11898/1001-7313.20230502
  • 1.

    Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

  • 2.

    CMA Weather Modification Center, Beijing 100081

  • 3.

    Key Laboratory for Cloud Physics and Weather Modification of CMA, Beijing 100081

  • Received Date: 2023-05-24
  • Rev Recd Date: 2023-08-14
  • Publish Date: 2023-09-30
    Abstract
  • Great part of China experiences hot spells in summer of 2022. In August, an extensive and intensive heat wave occurred along the Yangtze Basins, which persists nearly a month, causing serious damage and the worst summer drought, which is the second only to 2011. The persistent hot spell tends to be closely related with the anomalous activity of the Western Pacific subtropical high (WPSH). To better understand the causes, observations and reanalysis data are used to study the mechanism of anomalous activities of WPSH, the influence of tropical circulation, and the westerly long-wave trough ridge on WPSH.During summer of 2022, anomalous activity is observed in both the continental subtropical high and WPSH. In mid-late July, WPSH shifted to the west, and the continental subtropical high over the Iranian Plateau expanded to the east, resulting in the formation of a high-pressure belt and heat wave in the middle and the lower reaches of the Yangtze. In August, the continental subtropical weakens, and WPSH extended westward to 90°E, 40 longitudinal degrees to the west of its climatic position, which plays an important role in the persistent heat wave.The steady westward march of WPSH is discussed based on the investigation of both the anomalies of tropical circulation and systems in the westerlies. In August, the intertropical convergence zone over the region from the Western Pacific to South China Sea is intensified, associated with vigorous convection, and three typhoons or tropical cyclones. The remarkable local Hadley circulation appeared over the South China Sea, which supported the maintenance of WPSH to the west of 115°E.The flow pattern in the westerly zone also shows some particular features. From mean geopotential height field at 500 hPa for the hot spell, a pattern of "two ridges with a trough in between" maintains over the Eurasian region. The Okhotsk ridge in the east almost merges with WPSH into a stable high pressure dam. The Rossby wave activity indicates the ridge over the Ural area in the west consistently conveying energy southeastward, which also plays an important role in the strengthening and maintenance of the subtropical high.
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  • Fig. 1  Spatial distribution of normalized daily mean temperature anomalies and precipitation anomaly percentage in China in summer of 2022

    (black boxes from left to right denote the Sichuan-Chongqing Area, the middle and the lower reaches of the Yangtze, respectively)

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    Fig. 2  Percentage of stations with daily maximum temperature equal to or greater than 35℃ and 40℃ in total stations in the Yangtze Basins, Sichuan-Chongqing Area, the lower and the middle reaches of the Yangtze from 1 Jun to 31 Aug in 2022 (the shaded denotes hot spell)

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    Fig. 3  Mean geopotential height (the solid line,unit:gpm) and anomalies (the shaded) at 500 hPa from 9 Jul to 31 Jul and from 1 Aug to 25 Aug in 2022 (thick solid and dashed lines denote 5880 gpm isoline in 2022 and its climatology during the same period, respectively)

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    Fig. 4  Time-longitude section of 5880 gpm isolines averaged along 25°-35°N from 1 Jul to 31 Aug in 2022 (solid lines)

    (dashed lines denote climatology, the shaded denotes geopotential height greater than 5880 gpm, dotted lines denote westward extension of the subtropical high over the Western Pacific)

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    Fig. 5  OLR anomalies from 1 Aug to 25 Aug in 2022 (solid and dashed lines denote 200 W·m-2 in 2022 and the climatology;the black box denotes the key region of the convection over the South China Sea) (a),time series of the mean OLR in the key region of the South China Sea from 25 Jul to 31 Aug in 2022 (the solid line) and its climatology (the dashed line)(vertical solid lines denote the hot spell, dotted lines denote westward extension of the subtropical high over the Western Pacific) (b)

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    Fig. 6  Time-latitude section of meridional wind anomalies at 850 hPa along 108°-130°E from 30 Jul to 31 Aug in 2022 (unit:m·s-1)

    (the thick line denotes the zero line, the vertical line denotes the hot spell during 1-25 Aug 2022)

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    Fig. 7  Time-longitude section of divergence anomalies at 850 hPa and 200 hPa along 7.5°－21°N from 30 Jul to 31 Aug in 2022

    (the black line denotes the zero line,the horizontal line denotes the hot spell during 1-25 Aug 2022)

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    Fig. 8  Vertical profile of mean anomalous meridional circulation along 108°-130°E(a) and 110°E(b) during 1-25 Aug 2022 (unit:m·s-1 for meridional wind, 102 Pa·s-1 for vertical velocity; the gray shaded denotes the anomalous vertical velocity, the black shaded denotes the topography)

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    Fig. 9  Time-longitude section of 500 hPa geopotential height along 40°-60°N from 30 Jul to 31 Aug in 2022

    (horizontal lines for the hot spell during 1-25 Aug 2022)

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    Fig. 10  300 hPa quasi-geostrophic stream function anomalies (the shaded) and wave activity flux (the vector, unit:m2·s-2) during 1-25(a) and 21-25(b) in Aug 2022 (vectors less than 2 m2·s-2 are not shown)

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    • Received : 2023-05-24
    • Accepted : 2023-08-14
    • Published : 2023-09-30
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