On the Influence of Air Mass Origin on Low‐Cloud Properties in the Southeast Atlantic
On the Influence of Air Mass Origin on Low‐Cloud Properties in the Southeast Atlantic
复制标题
气团起源对东南大西洋低云特性的影响
DOI：
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复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Katharina Schwarz
中科院分区：
文献类型：
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作者：
J. Fuchs;J. Cermak;H. Andersen;R. Hollmann;Katharina Schwarz
本文研究了生物质燃烧季节，气团来源和动力对东南大西洋云量变化的影响。了解云及其在不同尺度上的决定因素对于限制地球的辐射收支很重要，因此在气候系统研究中也很突出。在本研究中，观测到的SEA层积云的热稳定性不仅是当地环境条件的结果，而且还与大尺度气象有关，因为进入该地区的气团的空间来源经常被忽视，但却起着重要作用。为了评估云特性在多大程度上受到气溶胶浓度、气团历史和气象的影响，我们进行了混合单粒子拉格朗日综合轨迹聚类分析，将云特性的卫星观测（旋转-增强可见光和红外成像仪）、气溶胶种类信息（监测大气成分和气候）和气象背景（ERA -临时再分析）与气团联系起来。研究发现，与不同天气条件有关的气团起源的特征模式导致研究区南部明显的云性质变化。远距离气团与影响云微物理的中纬度天气扰动有关，特别是在研究区域的西南子域。云有效半径的变化与边界层加深和对流层低层稳定性（LTS）的变化相一致。东南子域云量受较高的LTS控制，气团来源起次要作用。这项研究有助于更好地理解在东南亚观测到的层积云特性背后的动力驱动因素，并为气溶胶-云相互作用提供了潜在的有趣条件。
This study investigates the impact of air mass origin and dynamics on cloud property changes in the Southeast Atlantic (SEA) during the biomass burning season. The understanding of clouds and their determinants at different scales is important for constraining the Earth's radiative budget and thus prominent in climate system research. In this study, the thermodynamically stable SEA stratocumulus cover is observed not only as the result of local environmental conditions but also as connected to large‐scale meteorology by the often neglected but important role of spatial origins of air masses entering this region. In order to assess to what extent cloud properties are impacted by aerosol concentration, air mass history, and meteorology, a Hybrid Single‐Particle Lagrangian Integrated Trajectory cluster analysis is conducted linking satellite observations of cloud properties (Spinning‐Enhanced Visible and Infrared Imager), information on aerosol species (Monitoring Atmospheric Composition and Climate), and meteorological context (ERA‐Interim reanalysis) to air mass clusters. It is found that a characteristic pattern of air mass origins connected to distinct synoptical conditions leads to marked cloud property changes in the southern part of the study area. Long‐distance air masses are related to midlatitude weather disturbances that affect the cloud microphysics, especially in the southwestern subdomain of the study area. Changes in cloud effective radius are consistent with a boundary layer deepening and changes in lower tropospheric stability (LTS). In the southeastern subdomain cloud cover is controlled by a generally higher LTS, while air mass origin plays a minor role. This study leads to a better understanding of the dynamical drivers behind observed stratocumulus cloud properties in the SEA and frames potentially interesting conditions for aerosol‐cloud interactions.
低层海洋云中云敏感气溶胶负荷的全球观测
DOI：
10.1002/2016jd025614
发表时间：
2016
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
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作者：
Andersen;Cermak;Schwarz
通讯作者：
Schwarz
影响因子：
6.3
作者：
Liu, D.;Allan, J.;Bandy, B.
通讯作者：
Bandy, B.