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Abstract <p>The response and coupling mechanism of the “solar-climate-regional water periodicity” is scientifically significant to the water resource management in semi-arid regions. In this study, the influence of solar activity and the El Niño Southern Oscillation (ENSO) on precipitation, temperature, air pressure, and runoff discharge were investigated in an inland river basin in middle eastern Inner Mongolia. Results show that sunspot activity and ENSO significantly influence hydrometeorological elements in the study area in the periodicities of 2–7 and 11a, respectively, while ENSO has no significant influence on surface runoff. With ENSO as the “medium,” solar motion energy “directly” or “indirectly” changes atmospheric circulation and regional climate in different frequency domains through “Sub-high East Asian monsoon circulation water vapour movement over the Western Pacific,” thus influencing the watershed hydrological process. However, the grassland type inland river basins, such as the study area, have complex underlying surface conditions and diverse surface water and groundwater recharge and transformation mechanisms, which may have formed a unique regional hydrological process, slightly delaying the response periodicity of surface runoff to ENSO.</p>

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Combined Influence of Solar Activity and ENSO on Hydrometeorological Elements in the Middle Eastern Inland River Basin of the Inner Mongolian Plateau, China

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Mingyang Li,
  • Jiwen Huang,
  • Fulin Li,
  • Yuzhi Shi,
  • Xiangfeng Gong,
  • Lili Liu,
  • Xiaohui Hao

摘要

Abstract

The response and coupling mechanism of the “solar-climate-regional water periodicity” is scientifically significant to the water resource management in semi-arid regions. In this study, the influence of solar activity and the El Niño Southern Oscillation (ENSO) on precipitation, temperature, air pressure, and runoff discharge were investigated in an inland river basin in middle eastern Inner Mongolia. Results show that sunspot activity and ENSO significantly influence hydrometeorological elements in the study area in the periodicities of 2–7 and 11a, respectively, while ENSO has no significant influence on surface runoff. With ENSO as the “medium,” solar motion energy “directly” or “indirectly” changes atmospheric circulation and regional climate in different frequency domains through “Sub-high East Asian monsoon circulation water vapour movement over the Western Pacific,” thus influencing the watershed hydrological process. However, the grassland type inland river basins, such as the study area, have complex underlying surface conditions and diverse surface water and groundwater recharge and transformation mechanisms, which may have formed a unique regional hydrological process, slightly delaying the response periodicity of surface runoff to ENSO.