Scholarlink

<p>The Transitional Climate Zone (TCZ) in East Asia represents a critical region where monsoon and non-monsoon climates interface, making it highly vulnerable to climate change. While TCZ precipitation changes under global warming have been well-studied, its response to CO<sub>2</sub> removal (CDR) remains poorly understood. This study investigates TCZ summer precipitation changes under an idealized CDR scenario and reveals a region-wide decrease during CO<sub>2</sub> ramp-down, with the strongest signals in the northeastern regions. Notably, the precipitation response under equal levels of warming or CO<sub>2</sub> forcing demonstrates clear asymmetry, characterized by drying during the CO<sub>2</sub> ramp-down rather than the ramp-up. Moisture budget analysis indicates that the reduction in precipitation during the CO<sub>2</sub> ramp-down period is closely associated with the divergence of vertically integrated atmospheric moisture flux. The divergence is primarily driven by dynamic processes (36.4%) rather than thermodynamic effects (5.2%). Quantification of moisture transport shows a net moisture output from the TCZ, with 78.6% attributed to the meridional monsoon moisture and 18.3% to the zonal westerlies. Further analysis of the East Asia Summer Monsoon (EASM) characteristics demonstrates that during CO<sub>2</sub> ramp-down, the monsoon system exhibits a weakened intensity, a southward retreat of its northern boundary, and a shortened duration with delayed onset and earlier withdrawal. Among these factors, the southward shift of the northern boundary has the greatest impact on the precipitation reduction, followed by the changes in monsoon duration. These findings suggest that CDR, despite its intended role in mitigating global warming, may enhance drying risks in the TCZ through altered atmospheric circulation patterns.</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

Summer precipitation responses to CO2 removal scenario over the transitional climate zone in East Asia and the driving mechanisms

  • 期刊论文

  • 发表日期：

    2025年3月11日

查看全文
  • Xiaoyun Su,
  • Lin Wang,
  • Gang Huang,
  • Ting Wang,
  • Jinling Piao,
  • Qiulin Wang

摘要

The Transitional Climate Zone (TCZ) in East Asia represents a critical region where monsoon and non-monsoon climates interface, making it highly vulnerable to climate change. While TCZ precipitation changes under global warming have been well-studied, its response to CO2 removal (CDR) remains poorly understood. This study investigates TCZ summer precipitation changes under an idealized CDR scenario and reveals a region-wide decrease during CO2 ramp-down, with the strongest signals in the northeastern regions. Notably, the precipitation response under equal levels of warming or CO2 forcing demonstrates clear asymmetry, characterized by drying during the CO2 ramp-down rather than the ramp-up. Moisture budget analysis indicates that the reduction in precipitation during the CO2 ramp-down period is closely associated with the divergence of vertically integrated atmospheric moisture flux. The divergence is primarily driven by dynamic processes (36.4%) rather than thermodynamic effects (5.2%). Quantification of moisture transport shows a net moisture output from the TCZ, with 78.6% attributed to the meridional monsoon moisture and 18.3% to the zonal westerlies. Further analysis of the East Asia Summer Monsoon (EASM) characteristics demonstrates that during CO2 ramp-down, the monsoon system exhibits a weakened intensity, a southward retreat of its northern boundary, and a shortened duration with delayed onset and earlier withdrawal. Among these factors, the southward shift of the northern boundary has the greatest impact on the precipitation reduction, followed by the changes in monsoon duration. These findings suggest that CDR, despite its intended role in mitigating global warming, may enhance drying risks in the TCZ through altered atmospheric circulation patterns.