Helicopter-borne measurements of small-scale processes in shallow cumulus convection over Barbados

巴巴多斯上空浅积云对流小规模过程的直升机测量

• 批准号: 164011789
• 负责人: Dr. Holger Siebert
• 金额: --
• 依托单位: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/164011789?language=en
• 关键词: Helicopter; borne; measurements; small; scale

The project proposed here aims at examining the complex interactions between atmospheric aerosol particles, small scale cloud dynamics, particle number size distributions, and radiative properties of trade wind cumulus clouds. The helicopter borne platform ’ACTOS’ will be used to measure meteorological parameters and properties of aerosol and clouds at Barbados. Measurements will be done in- and outside of clouds, with a high spatial resolution. For the first time, ACTOS will carry an adapted small CCNc (Cloud Condensation Nuclei counter) and newly developed fast instrumentation for aerosol characterization. Compared to aircraft measurements, the high spatial and temporal resolution, together with the low speed at which a helicopter flies, will enable a detailed examination of individual small trade wind cumuli and of their entrainment regions. Due to the ongoing mixing in these regions, they are important for the development of the cloud (droplet size distribution) as well as for modifying the aerosol (cloud processing, e.g. a change in particle hygroscopicity). This then also influences the optical properties of the cloud and its surroundings, and to capture this, radiation measurements will be done with instruments being positioned beneath the helicopter. By combining the different aspects, and particularly by examining the influence of different atmospheric aerosols, we aim at obtaining a better description of the early stages of trade wind cumuli, enabling a more detailed description of this cloud type in numerical (climate-) models. These proposed activities are embedded into a long term measurement program that will last for two years and that is realized by the MPI Hamburg (including remote sensing and measurements on the HALO aircraft).

本文提出的项目旨在研究大气气溶胶粒子、小尺度云动力学、粒子数尺寸分布和信风积云辐射特性之间的复杂相互作用。直升机载平台“ACTOS”将用于测量巴巴多斯的气溶胶和云的气象参数和特性。测量将在云层内外进行，具有高空间分辨率。ACTOS将首次携带经过改装的小型云凝结核计数器和新开发的快速气溶胶表征仪器。与飞机测量相比，高的空间和时间分辨率，加上直升机飞行的低速度，将能够详细检查个别小型信风积云及其夹带区域。由于这些区域正在进行混合，它们对于云的发展（液滴尺寸分布）以及气溶胶的改变（云处理，例如颗粒吸湿性的变化）都很重要。这也会影响云及其周围环境的光学特性，为了捕捉这一点，将使用位于直升机下方的仪器进行辐射测量。通过结合不同的方面，特别是通过研究不同的大气气溶胶的影响，我们的目标是获得更好的描述信风积云的早期阶段，使这种云类型的数值（气候）模式更详细的描述。这些拟议的活动被纳入一个长期测量方案，该方案将持续两年，由汉堡MPI实现（包括HALO飞机上的遥感和测量）。

项目成果

New airborne retrieval approach for trade wind cumulus properties under overlying cirrus

• DOI: 10.1002/jgrd.50334
• 发表时间: 2013-05
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: F. Werner;H. Siebert;P. Pilewskie;T. Schmeissner;R. Shaw;M. Wendisch

Collocated measurements of boundary layer cloud microphysical and radiative properties: A feasibility study

边界层云微物理和辐射特性的并置测量：可行性研究

• DOI: 10.1029/2010jd013930
• 发表时间: 2010
• 期刊: Journal of Geophysical Research
• 作者: Henrich;H. Siebert;E. Jäkel;R. A. Shaw;M. Wendisch
• 通讯作者: M. Wendisch

Retrieval of cirrus optical thickness and assessment of ice crystal shape from ground-based imaging spectrometry

利用地面成像光谱法反演卷云光学厚度并评估冰晶形状

• DOI: 10.5194/amt-6-1855-2013
• 发表时间: 2013
• 期刊: Atmospheric Measurement Techniques
• 影响因子: 3.8
• 作者: Schäfer;E. Bierwirth;A. Ehrlich;F. Heyner;M. Wendisch
• 通讯作者: M. Wendisch

The fine-scale structure of the trade wind cumuli over Barbados – An introduction to the CARRIBA project

巴巴多斯上空信风积云的精细尺度结构——CARRIBA项目简介

• DOI: 10.5194/acp-13-10061-2013
• 发表时间: 2013
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Siebert;M. Beals;J. Bethke;E. Bierwirth;T. Conrath;K. Dieckmann;F. Ditas;A. Ehrlich;D. Farrell;S. Hartmann;M. A. Izaguirre;J. Katzwinkel;L. Nuijens;G. Roberts;M. Schäfer;R. A. Shaw;T. Schmeissner;I. Serikov;B. Stevens;F. Stratmann
• 通讯作者: F. Stratmann

Twomey effect observed from collocated microphysical and remote sensing measurements over shallow cumulus

• DOI: 10.1002/2013jd020131
• 发表时间: 2014-02
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: F. Werner;F. Ditas;H. Siebert;M. Simmel;B. Wehner;P. Pilewskie;T. Schmeissner;R. Shaw;S. Hartmann