Obvious difference of dominant circulation patterns between dry-type and humid-type heatwaves in North China

IF 3.5 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Ting Ding, Hui Gao, Tiejun Xie
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Abstract

Based on the observed maximum temperature (Tmax), relative humidity (RH) and NCEP/NCAR reanalysis data during 1981–2021, basic temporal features and dominant atmospheric circulation patterns of dry-type and humid-type heatwaves in North China are investigated and compared. Statistical results indicate the dry heatwaves occur mainly in early summer (from early June to early July), that is, before the rainy season of North China, while the humid heatwaves have a high frequency in mid-July to mid-August. During the research period, the increasing trend of dry heatwaves is 0.67 days·decade−1, while the humid heatwaves increase at a greatly higher rate of 1.85 days·decade−1. For the dry heatwave, a high ridge in the subtropical westerlies plays the main role, and the northerly wind in the east of the ridge reduces the air moisture convergence over the region. However, for the humid heatwave, the westward and northward propagations of the western Pacific subtropical high (WPSH) may make the major contribution, and the southerly wind anomalies in the west of the WPSH enlarge the water vapour to the region. The adiabatic heating in subsiding air at all levels and horizontal temperature advection at lower troposphere are stronger for dry heatwaves than for humid heatwaves, which cause a higher Tmax for the former type. These results highlight the diversity of the heatwaves in North China, which suggests that multiple local and large-scale subseasonal circulations should be considered to improve the subseasonal to seasonal forecast skills for heat extremes.

华北地区干热型和湿热型热浪主导环流模式的明显差异
基于1981-2021年观测到的最高气温(Tmax)、相对湿度(RH)和NCEP/NCAR再分析资料,研究并比较了华北地区干热型和湿热型热浪的基本时间特征和主导大气环流模式。统计结果表明,干热风主要出现在初夏(6 月初至 7 月初),即华北雨季之前,而湿热风则高发于 7 月中旬至 8 月中旬。在研究期间,干热风的增长趋势为 0.67 天-十年-1,而湿热风的增长速度则高达 1.85 天-十年-1。在干热浪中,副热带西风高脊起了主要作用,高脊东侧的偏北风减少了该地区的空气湿度辐合。然而,对于湿热波来说,西太平洋副热带高压(WPSH)向西和向北的传播可能起主要作用,而副热带高压西部的偏南风异常则扩大了该地区的水汽。各层次下沉空气的绝热加热和对流层低层的水平温度平流在干热风中比在湿热风中更强,这导致前者的最高气温更高。这些结果凸显了华北地区热浪的多样性,表明应考虑多种局地和大尺度副季节环流,以提高极端热浪的副季节到季节预报能力。
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来源期刊
International Journal of Climatology
International Journal of Climatology 地学-气象与大气科学
CiteScore
7.50
自引率
7.70%
发文量
417
审稿时长
4 months
期刊介绍: The International Journal of Climatology aims to span the well established but rapidly growing field of climatology, through the publication of research papers, short communications, major reviews of progress and reviews of new books and reports in the area of climate science. The Journal’s main role is to stimulate and report research in climatology, from the expansive fields of the atmospheric, biophysical, engineering and social sciences. Coverage includes: Climate system science; Local to global scale climate observations and modelling; Seasonal to interannual climate prediction; Climatic variability and climate change; Synoptic, dynamic and urban climatology, hydroclimatology, human bioclimatology, ecoclimatology, dendroclimatology, palaeoclimatology, marine climatology and atmosphere-ocean interactions; Application of climatological knowledge to environmental assessment and management and economic production; Climate and society interactions
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