Exploring the opposite shift trends between extremely high and low planetary boundary layer height in China

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2025-08-09 DOI:10.1016/j.atmosres.2025.108425

Man Yue , Yawen Liu , Minghuai Wang , Xinyi Dong , Jianping Guo , Yuwen Niu , Honghui Xu

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引用次数: 0

Abstract

Interactions between aerosols and the planetary boundary layer (PBL) play a crucial role in aggravating air quality and modulating regional climate. Despite intensive studies exploring the aerosol-PBL interaction predominantly focused on short-term haze events, uncertainties remain in understanding this interaction over longer timescales. To fill this gap, we investigate the long-term trends of extremely high and low PBL height (PBLH) across China, utilizing multi-observed datasets and sensitivity experiments conducted with the Community Atmosphere Model version 6 (CAM6) with full chemistry. Here the extremely high (low) PBLH is defined as mean values of the daily PBLH higher (lower) than 90th (10th) percentile for each season. Our analysis reveals a significant increase in extremely high PBLH during the period 1979–2003 (seasonal ranging from +283.36 to +326.80 m/decade), followed by a pronounced reversal to declining trends during 2004–2016 (−321.45 to −178.83 m/decade). The trend shift is primarily driven by variations in surface sensible heat fluxes. Conversely, extremely low PBLH exhibits an obvious “negative to positive” trend shift around 2007 during 2000–2016, especially over Eastern and Central China (ECC) with a mean trend magnitude of +153.2 m/decade after 2007. The long-term trend of extremely low PBLH is dominated by changes in shortwave atmosphere absorption, which are influenced by the direct radiative effect of black carbon (BC) aerosols. Comparative simulations with BC's direct radiative effect turning on/off further demonstrate the reduced BC aerosols after 2007 diminishes the shortwave atmosphere absorption and enhances the surface shortwave radiation, thereby promoting an increase in extremely low PBLH, and vice versa. These findings highlight the distinct mechanisms influencing the long-term trend of extremely high and low PBLH over China, and provide new insights into the long-term variability of PBLH and its relationship with aerosols.

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探索中国极高和极低行星边界层高度的相反变化趋势

气溶胶与行星边界层的相互作用对大气质量的恶化和区域气候的调节起着至关重要的作用。尽管对气溶胶- pbl相互作用的深入研究主要集中在短期雾霾事件上，但在更长的时间尺度上理解这种相互作用仍然存在不确定性。为了填补这一空白，我们利用多观测数据集和全化学模式CAM6 （Community Atmosphere Model version 6）进行的敏感性实验，研究了中国地区极高和极低PBL高度（PBLH）的长期趋势。这里，极高（极低）PBLH被定义为每个季节每日PBLH高于（低于）第90（10）个百分位的平均值。我们的分析显示，在1979-2003年期间（季节性范围为+283.36至+326.80 m/ 10年），极高的PBLH显著增加，随后在2004-2016年期间（- 321.45至- 178.83 m/ 10年）出现明显的下降趋势逆转。趋势转变主要是由地表感热通量的变化驱动的。与此相反，极低PBLH在2007年前后呈现明显的“负向正”趋势转变，特别是在华东和华中地区（ECC）， 2007年以后的平均趋势幅度为+153.2 m/ a。极低PBLH的长期趋势主要受大气短波吸收变化的影响，短波吸收变化受黑碳气溶胶直接辐射效应的影响。与BC直接辐射效应打开/关闭的对比模拟进一步表明，2007年后BC气溶胶的减少减少了大气对短波的吸收，增强了地表短波辐射，从而促进了极低PBLH的增加，反之亦然。这些发现突出了影响中国极高和极低PBLH长期趋势的不同机制，并为PBLH的长期变化及其与气溶胶的关系提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.