云对行星边界层高度的影响:比较研究和因素分析

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Hui Li , Boming Liu , Wei Gong , Yingying Ma , Shikuan Jin , Weiyan Wang , Ruonan Fan , Shuailong Jiang
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引用次数: 0

摘要

云是影响行星边界层(PBL)演变的关键因素之一。了解云层与行星边界层高度(PBLH)之间复杂的相互作用对于准确模拟和预测行星边界层过程至关重要。本研究基于 2013 年 1 月至 2020 年 12 月期间在南部大平原站点观测到的激光雷达、辐射计、气压计和气象参数,研究了云对 PBLH 演变的影响。研究结果表明,云的存在对 PBLH 的演变有影响。白天,多云条件下的 PBLH 低于晴朗条件下的 PBLH,而夜间,多云条件下的 PBLH 高于晴朗条件下的 PBLH。出现这种现象的原因是,晴天的强烈太阳辐射和多云夜晚的强烈湍流混合作用促成了 PBLH 的形成和维持。此外,在白天,云会散射和吸收太阳辐射,导致净辐射(NetR)、显热通量(SHF)、地表温度(TEM)和土壤温度(SoilT)降低。这些条件加上较弱的湍流强度和较高的相对湿度(RH),导致多云条件下的 PBLH 较低。虽然晴朗夜晚的 TEM 和 SoilT 相对较高,但快速的地表辐射冷却和强大的大气稳定性抑制了 PBLH 的发展。因此,在多云的夜晚,云会吸收和反射地表的长波辐射,降低地表辐射冷却率,增强大气的不稳定性和湍流强度。此外,与晴朗条件相比,较高的 NetR 和 SHF 以及较低的相对湿度会导致 PBLH 稍微加深。总之,这项研究系统地阐明了云对 PBLH 演变的影响,有助于理解云对 PBL 结构的调节作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of clouds on planetary boundary layer height: A comparative study and factors analysis
Clouds are one of the key factors influencing the evolution of the planetary boundary layer (PBL). Understanding the complex interactions between clouds and PBL height (PBLH) is essential for accurately simulating and predicting PBL processes. This study investigates the impact of clouds on PBLH evolution based on the lidar, radiosonde, ceilometer, and meteorological parameters observations at the Southern Great Plains site during the period January 2013 to December 2020. The findings indicates that the presence of clouds has an impact on the evolution of the PBLH. During the daytime, PBLH is lower under cloudy conditions than clear conditions, whereas during nighttime, PBLH is higher under cloudy conditions. This phenomenon arises because the intense solar radiation on clear days and strong turbulent mixing on cloudy nights contribute to the formation and maintenance of PBLH. Furthermore, during the daytime, clouds scatter and absorb solar radiation, leading to lower net radiation (NetR), sensible heat flux (SHF), surface temperature (TEM), and soil temperature (SoilT). These conditions, coupled with weaker turbulence intensity and high relative humidity (RH), leading to lower PBLH under cloudy conditions. Although TEM and SoilT are relatively high during clear nights, rapid surface radiative cooling and strong atmospheric stability inhibit the development of the PBLH. Consequently, during cloudy nights, clouds absorb and reflect longwave radiation from the surface, reducing surface radiative cooling rates, enhancing atmospheric instability and turbulence intensity. Furthermore, higher NetR and SHF, along with decreased RH, result in slightly deeper PBLH compared to clear conditions. Overall, this study systematically elucidates the influence of clouds on PBLH evolution and contributes to the understanding of the modulation of cloud on PBL structure.
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来源期刊
Atmospheric Research
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.
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