近日，西班牙巴塞罗那大学Jaume Ruiz de Morales团队研究了基于CALIPSO的全球云-气溶胶过渡区评估。相关论文于2025年7月24日发表在《大气科学进展》杂志上。

云和气溶胶之间的相互作用是评估地球辐射收支中最大的不确定性之一，突出了云-气溶胶连续体中过渡带研究的重要性。研究组评估了全球TZ条件的分布，分析了其光学特性，并确定了大多数TZ条件相关的云或气溶胶类型，主题是CALIPSO卫星上的云-气溶胶正交偏振激光雷达（CALIOP）仪器的云-气溶胶识别（CAD）分数。

CAD评分通过衰减后向散射、总颜色比、体积去极化比、高度和纬度的概率密度函数对云和气溶胶进行分类。在应用了几个过滤器以避免伪影后，TZ被识别为不能明确分类为云或气溶胶的大气层，在CAD评分的无置信范围（NCR）内的层，以及环状条纹。NCR层的光学特征显示了两个主要集群：集群1，具有介于高海拔冰云和气溶胶之间的特性（例如，缕状云碎片）；集群2，具有介于低海拔水云和气溶胶之间的特性（例如，大型水合气溶胶）。

该结果突出了TZ条件的显著普遍性，出现在9.5%的剖面中，占检测层的6.4%。第1层和Cirrthem边缘层主要分布在ITCZ附近和中纬度地区，而第2层在中非、西非和东亚海岸的海洋上空更为频繁，在这些地区烟雾升高和海洋气溶胶增多是很常见的。

附：英文原文

Title: Global Assessment of the Cloud-Aerosol Transition Zone Using CALIPSO

Author: Jaume Ruiz de Morales, Josep Calbó, Josep-Abel González, Hendrik Andersen, Jan Cermak, Julia Fuchs, Yolanda Sola

Issue&Volume: 2025-07-24

Abstract: The interactions between clouds and aerosols cause one of the largest uncertainties in assessing the Earth’s radiation budget, highlighting the importance of research on the transition zone (TZ) within the cloud-aerosol continuum. This study assesses the global distribution of TZ conditions, analyzes its optical characteristics and determines the cloud or aerosol types most TZ conditions are associated with, using the cloud-aerosol discrimination (CAD) score of the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument on the CALIPSO satellite. The CAD score classifies clouds and aerosols by the probability density functions of attenuated backscatter, total color ratio, volume depolarization ratio, altitude and latitude. After applying several filters to avoid artifacts, the TZ was identified as the atmospheric layers that cannot be clearly classified as clouds or aerosols, layers within the no-confidence range (NCR) of the CAD score, and Cirrus fringes. The NCR layers’ optical characteristics showed two main clusters: Cluster 1, with properties between high-altitude ice clouds and aerosols (e.g. wispy cloud fragments) and Cluster 2, with properties between water clouds and aerosols at lower altitudes (e.g. large hydrated aerosols). Our results highlight the significant ubiquity of TZ conditions, appearing in 9.5% of all profiles and comprising 6.4% of the detected layers. Cluster 1 and Cirrus fringes layers predominate near the ITCZ and in mid-latitudes, whereas Cluster 2 layers are more frequent over the oceans in the central West African and East Asian coasts where elevated smoke and dusty marine aerosols are common.

DOI: 10.1007/s00376-025-5052-y

Source: http://www.iapjournals.ac.cn/aas/article/doi/10.1007/s00376-025-5052-y