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卞韬, 任国玉, 刘思廷, 等. 2023. 石家庄城市热岛效应:从冠层、表层到土壤深层[J]. 气候与环境研究, 28(4): 409−419. doi: 10.3878/j.issn.1006-9585.2023.22089
引用本文: 卞韬, 任国玉, 刘思廷, 等. 2023. 石家庄城市热岛效应:从冠层、表层到土壤深层[J]. 气候与环境研究, 28(4): 409−419. doi: 10.3878/j.issn.1006-9585.2023.22089
BIAN Tao, REN Guoyu, LIU Siting, et al. 2023. Urban Heat Island Effect in Shijiazhuang: From the Canopy to the Surface and Deep Layers of Soil [J]. Climatic and Environmental Research (in Chinese), 28 (4): 409−419. doi: 10.3878/j.issn.1006-9585.2023.22089
Citation: BIAN Tao, REN Guoyu, LIU Siting, et al. 2023. Urban Heat Island Effect in Shijiazhuang: From the Canopy to the Surface and Deep Layers of Soil [J]. Climatic and Environmental Research (in Chinese), 28 (4): 409−419. doi: 10.3878/j.issn.1006-9585.2023.22089

石家庄城市热岛效应:从冠层、表层到土壤深层

Urban Heat Island Effect in Shijiazhuang: From the Canopy to the Surface and Deep Layers of Soil

  • 摘要: 利用石家庄城市气象站和附近2个乡村站2009~2012年的逐日地面气温、0~320 cm土壤温度资料,对比分析了石家庄站从冠层、表层到土壤深层的城市热岛(Urban Heat Island, UHI)效应及其差异,结果表明:1)2009~2012年年平均气温UHI强度为0.9°C,0~320 cm土壤温度UHI强度在−0.5~0.2°C之间,气温UHI强度明显强于土壤温度UHI。表层(0 cm)和浅层(5~40 cm)土壤温度基本表现为“热岛效应”,但深层(80~320 cm)土壤温度表现为“冷岛效应”,40~80 cm是二者的转换层位;深层土壤温度可能受局地气候影响呈现出局地性特点。2)春季、夏季、秋季、冬季气温UHI强度分别为1.1°C、0.6°C、0.7°C和1.3°C,夏季最弱,冬季最强。春季和夏季表层和40 cm以上土壤温度表现为热岛,80 cm以下表现为冷岛;秋季不同深度土壤温度均表现为冷岛,320 cm深度冷岛强度最强;冬季表层和80 cm以上土壤温度主要表现为热岛,320 cm深度表现为冷岛;土壤表层热岛强度季节性变化,与气温的基本一致,其物理机制相似。3)各月气温UHI强度在0.5~1.6°C之间,1月最强,7月和10月最弱。表层和40 cm以上土壤温度一般在1~7月和12月表现为热岛,UHI强度多为6月最强,8~11月表现为冷岛;80 cm以下土壤温度多数月份表现为冷岛。4)年和四季平均气温UHI强度具有明显的日变化特征,年和四季表层土壤温度UHI强度也有较为明显的日变化特征,但随土壤深度加大,土壤温度UHI强度的日变化逐渐减弱,并最终转化为冷岛效应。

     

    Abstract: Based on the daily observational data of air temperature and the soil temperature at a depth of 0–320 cm at the Shijiazhuang urban meteorological station and two nearby rural stations from 2009 to 2012, the urban heat island (UHI) effect from the canopy to the surface and deep layers of soil at Shijiazhuang station and its differences were compared and analyzed. The results revealed that: 1) The annual average air temperature UHI intensity from 2009 to 2012 was 0.9°C, the UHI intensity of the soil temperature at a depth of 0–320 cm was between −0.5°C and 0.2°C, and the air temperature UHI intensity was substantially stronger than that of the soil temperature. The surface (0 cm) and shallow (5–40 cm) soil temperatures exhibited a heat island effect, the deep (80–320 cm) soil temperature exhibited a cold island effect, and the soil temperature at a depth of 40–80 cm was the conversion horizon of the two. Deep soil temperature, which may be impacted by the local climate, demonstrated local characteristics. 2) The air temperature UHI intensities during spring, summer, autumn, and winter were 1.1°C, 0.6°C, 0.7°C, and 1.3°C, respectively; the seasons exhibiting the strongest and weakest UHI intensities were winter and summer, respectively. Furthermore, the soil temperatures at the surface layer and above 40 cm exhibited the heat island effect, and those below 80 cm exhibited the cold island effect. During autumn, the soil temperature at different depths exhibited the cold island effect, with the intensity of the cold island effect at a depth of 320 cm being the strongest. During winter, the soil temperatures at the surface layer and above 80 cm predominantly exhibited the heat island effect, whereas those at a depth of 320 cm exhibited the cold island effect. The seasonal variation of the soil surface UHI intensity was consistent with that of the air temperature, and its physical mechanism exhibited similar properties. 3) The air temperature UHI intensity in each month was between 0.5°C and 1.6°C, with the strongest intensity observed during January and the weakest intensity observed during July and October. The soil temperatures at the surface layer and above 40 cm generally exhibited the heat island effect from January to July and December, with the UHI intensity peaking during June, and exhibited the cold island effect from August to November. The soil temperature below 80 cm exhibited the cold island effect for the majority of the year. 4) The UHI intensities of the annual and seasonal average air temperatures clearly exhibited diurnal variation characteristics; the annual and seasonal surface soil temperatures exhibited similar characteristics. However, with the increase in soil depth, the diurnal variation of soil temperature UHI intensity gradually weakened and finally transformed into the cold island effect.

     

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