ARTS Microwave Single Scattering Properties Database
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The database contains microwave single scattering data, mainly of ice hydrometeors. Main applications lie in microwave remote sensing, both passive and active. Covered hydrometeors range from pristine ice crystals to large aggregates, graupel and hail, 34 types in total. Furthermore, 34 frequencies from 1 to 886 GHz, and 3 temperatures, 190, 230 and 270 K, are included. The main article orientation is currently totally random (i.e. each orientation is equally probable), but the database is designed to also handle azimuthally orientation, and data for this orientation case will be added in the future. Mie code was used for the two completely spherical habits, while the bulk of data were calculated using the discrete dipole approximation method (DDA). Interfaces for easy user access is available under a separate upload, due to different licensing, under the title ARTS Microwave Single Scattering Properties Database Interfaces. Interfaces in MATLAB and Python are available, supporting browsing and importing of the data. There is also functionality for extracting data for usage in RTTOV. A description of the database is also available in the following article. Please cite it if you use the database for a publication. Eriksson, P., R. Ekelund, J. Mendrok, M. Brath, O. Lemke, and S. A. Buehler (2018), A general database of hydrometeor single scattering properties at microwave and sub-millimetre wavelengths, Earth Syst. Sci. Data, 10, 1301–1326, doi: 10.5194/essd-10-1301-2018. New version 1.1.0 released: Database, technical report and readme document updated. It is highly recommended to download both the new interface and database versions. -Added three new habits: two liquid habits with azimuthally random orientation and one new bullet rosette with totally random orientation (with IDs from 35 to 37). -Updated Python and MATLAB interface to accommodate azimuthally random oriented data and with some other minor updates. -DDA calculations at frequencies under 100 GHz have been re-calculated using higher EPS settings, in order to accommodate radar applications (see technical report, Sec. 4.1.1). -The tolerance of the extinction cross-section post-calculation check is now 10 % instead of 30 % (see bullet 5 in technical report, Sec. 4.4.1.1). Those calculations that could not meet the stricter criteria were recalculated using higher EPS setting. -Format of standard habits revised. The weighting applied to the large habit at each size is now available in the in the mat-files. -Fixed wrong index for GEM hail in specifications table.
本数据库包含微波单散射数据，主要针对冰相水凝物（ice hydrometeors）。其主要应用场景涵盖被动与主动微波遥感。所覆盖的水凝物类型从原始冰晶、大型聚合体、霰粒到冰雹，总计34种。此外，数据库包含1至886 GHz范围内的34个频率，以及190 K、230 K和270 K三种温度条件下的数据。 当前默认的粒子取向为完全随机模式（即各取向概率均等），但本数据库的设计也支持方位角取向模式，未来将补充该取向模式下的相关数据。 针对两种完全球形的粒子形态，研究人员采用了米氏（Mie）算法进行计算；其余绝大多数数据则通过离散偶极近似方法（Discrete Dipole Approximation, DDA）计算得到。 由于授权协议存在差异，本数据库的用户便捷访问接口已单独上传，命名为《ARTS微波单散射特性数据库接口》。该接口包含MATLAB与Python两个版本，支持数据浏览与导入功能，同时还可提取用于RTTOV的相关数据。 本数据库的详细说明可参阅下述论文，若您将本数据库用于学术发表，请引用该文献：Eriksson, P., R. Ekelund, J. Mendrok, M. Brath, O. Lemke, 及 S. A. Buehler (2018), 《微波与亚毫米波波段水凝物单散射特性通用数据库》，Earth Syst. Sci. Data，10，1301–1326，doi: 10.5194/essd-10-1301-2018。 新版本1.1.0已发布：数据库、技术报告与自述文档均已更新。强烈建议同时下载新版接口与数据库文件。 - 新增三项粒子形态：两种具有方位角随机取向的液态粒子形态，以及一种全新的完全随机取向的子弹状玫瑰形冰晶（ID范围为35至37）。 - 更新MATLAB与Python接口，以适配方位角随机取向的数据，并进行了其他若干小幅优化。 - 针对100 GHz以下频率的离散偶极近似计算，已采用更高的EPS参数设置重新计算，以适配雷达应用需求（详见技术报告第4.1.1节）。 - 将消光截面后处理校验的容差从30%调整为10%（详见技术报告第4.4.1.1节第5条）。未满足更严格标准的计算任务已通过更高EPS参数设置重新完成。 - 修订了标准粒子形态的格式，各尺寸下大型粒子形态的权重数据现已可在MATLAB数据文件（.mat）中获取。 - 修复了规格表中GEM型冰雹的索引错误。
