Scholarlink

<p>Global warming is typically characterized by the general increase in both minimum temperature (T<sub>min</sub>) and maximum temperature (T<sub>max</sub>). The diurnal temperature range (DTR), reflecting the asymmetry of temperature rise, serves as a key indicator of climate change and land cover change. Soil moisture (SM) is one of the primary factors affecting DTR. However, as the main influencing factor, the effect of SM on DTR at the global scale has not been well articulated. Here, we used ERA5-Land reanalysis data from 1980 to 2022 to examine global response patterns of DTR to SM across different climatic backgrounds. The results show that DTR increased over 56.65% of global land areas (excluding Antarctica), while SM decreased in 77.58% of areas. The negative correlation between DTR and SM is notably nonlinear, with DTR showing greater sensitivity to SM changes under low SM conditions. Based on the change trends of SM and DTR, four distinct response patterns were identified. In regions with increasing SM, enhanced latent heat flux suppresses daytime warming and higher specific humidity (SH) slows nighttime cooling, leading to reduced DTR. However, in some high-latitude regions, increased SM reduces surface albedo, boosting shortwave solar radiation (SSR) and T<sub>max</sub>, while the night below 0℃ weaken the effect on T<sub>min</sub>, resulting in increased DTR. In regions where SM decreases, the response of DTR depends on the background value of SM. In areas with high SM, a reduction in SM has a weaker effect on surface energy balance, while increased radiation causes a rise in latent heat flux, resulting the decrease of DTR. When SM is low, further reductions limit evaporation and decrease latent heat flux, causing DTR to increase. These findings are of great significance for a deeper understanding of the impact mechanism of climate change and taking active countermeasures.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The global response patterns of diurnal temperature range to soil moisture under different climatic backgrounds

  • 期刊论文

  • 发表日期：

    2026年4月1日

查看全文
  • Jingyu Men,
  • Xiao Chen,
  • Kang Jiang,
  • Pengshuai Bi,
  • Na Huang,
  • Riping Gao,
  • Changlin Wu,
  • Fangxiao Zhang,
  • Zhanrui Huang,
  • Enze Gao,
  • Yijia Yao,
  • Zhihua Pan

摘要

Global warming is typically characterized by the general increase in both minimum temperature (Tmin) and maximum temperature (Tmax). The diurnal temperature range (DTR), reflecting the asymmetry of temperature rise, serves as a key indicator of climate change and land cover change. Soil moisture (SM) is one of the primary factors affecting DTR. However, as the main influencing factor, the effect of SM on DTR at the global scale has not been well articulated. Here, we used ERA5-Land reanalysis data from 1980 to 2022 to examine global response patterns of DTR to SM across different climatic backgrounds. The results show that DTR increased over 56.65% of global land areas (excluding Antarctica), while SM decreased in 77.58% of areas. The negative correlation between DTR and SM is notably nonlinear, with DTR showing greater sensitivity to SM changes under low SM conditions. Based on the change trends of SM and DTR, four distinct response patterns were identified. In regions with increasing SM, enhanced latent heat flux suppresses daytime warming and higher specific humidity (SH) slows nighttime cooling, leading to reduced DTR. However, in some high-latitude regions, increased SM reduces surface albedo, boosting shortwave solar radiation (SSR) and Tmax, while the night below 0℃ weaken the effect on Tmin, resulting in increased DTR. In regions where SM decreases, the response of DTR depends on the background value of SM. In areas with high SM, a reduction in SM has a weaker effect on surface energy balance, while increased radiation causes a rise in latent heat flux, resulting the decrease of DTR. When SM is low, further reductions limit evaporation and decrease latent heat flux, causing DTR to increase. These findings are of great significance for a deeper understanding of the impact mechanism of climate change and taking active countermeasures.