Legacy of aerosol radiative effect predominates daytime dust loading evolution

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Xiaoyan Zhang , Haishan Chen , Xiyan Xu , Xiao-Ming Hu , Lan Gao , Gensuo Jia
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Abstract

Dust radiative effect imposes pronounced perturbations on planetary boundary layer (PBL) development. In turn, the modified PBL characteristics and circulation fields regulate subsequent dust processes, which have not been explored sufficiently. In this study, parallel experiments are designed to isolate the instant, legacy and nonlinear impacts of aerosol radiative effect on daytime dust storm evolution over the Tarim Basin. During a typical dust storm event, legacy radiative effect is found to dominate dust loading dynamics and modulates mean dust burden by more than 16 % in the central basin and − 41 % in the marginal basin. Specifically, the dust column concentration increases in central regions but decreases in marginal regions. Dust aerosols cause opposite heating rate distributions and PBL structure between the central and marginal regions through altering radiative balance. Dust-induced cooling effect in the marginal regions leads to PBL suppression and attenuates entrainment mixing. Negative net heating also results in lowered potential temperature, elevated air pressure and thus increases their horizontal gradients. Accordingly, wind speeds are amplified through geostrophic and thermal wind effects, which further accelerate deposition rates, and eventually weaken dust suspension. In the central basin, dust plumes stimulate a warm mixing layer and unstable entrainment zone, which inhibit dry deposition removal and favor dust accumulation in the atmosphere. Our study highlights the importance of accounting PBL dynamics and geostrophic balance in quantifying the impacts of preceding radiative effect on subsequent dust evolution.

Abstract Image

气溶胶辐射效应的遗留影响了白天尘埃负荷的演变
尘埃辐射效应对行星边界层(PBL)的发展产生了明显的扰动。反过来,改变后的行星边界层特征和环流场又会调节后续的尘埃过程,而目前对这些过程的研究还不够深入。在这项研究中,设计了平行实验来分离气溶胶辐射效应对塔里木盆地白天沙尘暴演变的即时、遗留和非线性影响。研究发现,在典型的沙尘暴事件中,遗留辐射效应主导着沙尘负荷的动态变化,并使盆地中部的平均沙尘负荷变化超过 16%,边缘盆地的平均沙尘负荷变化为 - 41%。具体来说,中部地区的尘柱浓度会增加,而边缘地区则会减少。尘埃气溶胶通过改变辐射平衡,在中心区域和边缘区域造成相反的加热率分布和 PBL 结构。尘埃在边缘区域引起的冷却效应导致 PBL 受阻,并减弱了夹带混合。负净加热也会导致潜在温度降低、气压升高,从而增加其水平梯度。因此,风速通过地转效应和热风效应被放大,从而进一步加快了沉积速度,最终减弱了沙尘悬浮。在盆地中部,沙尘羽流刺激了暖混合层和不稳定的夹带区,从而抑制了干沉降的清除,有利于沙尘在大气中的积累。我们的研究强调了在量化前期辐射效应对后续沙尘演变的影响时,考虑 PBL 动力学和地转平衡的重要性。
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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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