On the atmospheric background for the occurrence of three heat wave types in East China
Compared with daytime (occurring only in daytime) and nighttime (occurring only in nighttime) heat waves (HWs), daytime-nighttime compound HWs (occurring simultaneously in daytime and nighttime) are highlighted to exert much severer impacts especially on human health. However, the physical mechanism...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Weather and Climate Extremes |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212094722001189 |
| _version_ | 1797894684207480832 |
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| author | Wenxin Xie Botao Zhou |
| author_facet | Wenxin Xie Botao Zhou |
| author_sort | Wenxin Xie |
| collection | DOAJ |
| description | Compared with daytime (occurring only in daytime) and nighttime (occurring only in nighttime) heat waves (HWs), daytime-nighttime compound HWs (occurring simultaneously in daytime and nighttime) are highlighted to exert much severer impacts especially on human health. However, the physical mechanisms underlying compound HWs are poorly understood. Based on the observed maximum and minimum temperatures and NCEP/NCAR reanalysis data, this article addressed the physical processes for the occurrence of compound HWs in East China, where compound HWs occur most frequently across China. Comparisons with those related to daytime or nighttime HWs were also performed. The results indicate that the occurrences of three HW types are all associated with anticyclonic circulation anomalies from the upper troposphere to the lower troposphere, whereas their locations and intensities determine the configuration of atmospheric conditions for different categories of HWs. The resultant less (more) cloud cover and humidity as well as increased downward shortwave (longwave) radiation at the surface favor the warming of daytime (nighttime), conducive to the occurrence of daytime (nighttime) HWs. The combination of above conditions associated with daytime and nighttime HWs, which helps the persistence of high temperatures from daytime to nighttime, benefits the occurrence of compound HWs. In addition, nighttime and compound HWs occur with the northwestward extension of the western Pacific subtropical high (WPSH), while it stays in the climatological location for the occurrence of daytime HWs. Further investigation suggests that daytime (nighttime) HWs are accompanied with an upper-tropospheric meridional (zonal) wave train propagating downstream from western Siberia (the east to the Caspian Sea). In comparison, the wave train related to compound HWs shares the mixed features of daytime and nighttime HWs, characterized by a meridional wave propagation from the Scandinavian Peninsula to East China and then a zonal propagation toward the western Pacific. |
| first_indexed | 2024-04-10T07:14:21Z |
| format | Article |
| id | doaj.art-b2e8d979a8e04f4d969c7077c1670aa5 |
| institution | Directory Open Access Journal |
| issn | 2212-0947 |
| language | English |
| last_indexed | 2024-04-10T07:14:21Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Weather and Climate Extremes |
| spelling | doaj.art-b2e8d979a8e04f4d969c7077c1670aa52023-02-26T04:27:09ZengElsevierWeather and Climate Extremes2212-09472023-03-0139100539On the atmospheric background for the occurrence of three heat wave types in East ChinaWenxin Xie0Botao Zhou1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science and Technology, Nanjing, 210044, China; School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, ChinaCollaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science and Technology, Nanjing, 210044, China; School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Corresponding author. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science and Technology, Nanjing, 210044, China.Compared with daytime (occurring only in daytime) and nighttime (occurring only in nighttime) heat waves (HWs), daytime-nighttime compound HWs (occurring simultaneously in daytime and nighttime) are highlighted to exert much severer impacts especially on human health. However, the physical mechanisms underlying compound HWs are poorly understood. Based on the observed maximum and minimum temperatures and NCEP/NCAR reanalysis data, this article addressed the physical processes for the occurrence of compound HWs in East China, where compound HWs occur most frequently across China. Comparisons with those related to daytime or nighttime HWs were also performed. The results indicate that the occurrences of three HW types are all associated with anticyclonic circulation anomalies from the upper troposphere to the lower troposphere, whereas their locations and intensities determine the configuration of atmospheric conditions for different categories of HWs. The resultant less (more) cloud cover and humidity as well as increased downward shortwave (longwave) radiation at the surface favor the warming of daytime (nighttime), conducive to the occurrence of daytime (nighttime) HWs. The combination of above conditions associated with daytime and nighttime HWs, which helps the persistence of high temperatures from daytime to nighttime, benefits the occurrence of compound HWs. In addition, nighttime and compound HWs occur with the northwestward extension of the western Pacific subtropical high (WPSH), while it stays in the climatological location for the occurrence of daytime HWs. Further investigation suggests that daytime (nighttime) HWs are accompanied with an upper-tropospheric meridional (zonal) wave train propagating downstream from western Siberia (the east to the Caspian Sea). In comparison, the wave train related to compound HWs shares the mixed features of daytime and nighttime HWs, characterized by a meridional wave propagation from the Scandinavian Peninsula to East China and then a zonal propagation toward the western Pacific.http://www.sciencedirect.com/science/article/pii/S2212094722001189Compound heat wavesDaytime heat wavesNighttime heat wavesAtmospheric circulationTeleconnection pattern |
| spellingShingle | Wenxin Xie Botao Zhou On the atmospheric background for the occurrence of three heat wave types in East China Weather and Climate Extremes Compound heat waves Daytime heat waves Nighttime heat waves Atmospheric circulation Teleconnection pattern |
| title | On the atmospheric background for the occurrence of three heat wave types in East China |
| title_full | On the atmospheric background for the occurrence of three heat wave types in East China |
| title_fullStr | On the atmospheric background for the occurrence of three heat wave types in East China |
| title_full_unstemmed | On the atmospheric background for the occurrence of three heat wave types in East China |
| title_short | On the atmospheric background for the occurrence of three heat wave types in East China |
| title_sort | on the atmospheric background for the occurrence of three heat wave types in east china |
| topic | Compound heat waves Daytime heat waves Nighttime heat waves Atmospheric circulation Teleconnection pattern |
| url | http://www.sciencedirect.com/science/article/pii/S2212094722001189 |
| work_keys_str_mv | AT wenxinxie ontheatmosphericbackgroundfortheoccurrenceofthreeheatwavetypesineastchina AT botaozhou ontheatmosphericbackgroundfortheoccurrenceofthreeheatwavetypesineastchina |