Extended Edited Synoptic Cloud Reports from Ships and Land Stations Over the Globe, 1952-2009 (NDP-026C)

This database contains surface synoptic weather reports for the entire globe, gathered from various available data sets. The reports were processed, edited, and rewritten to provide a single dataset of individual observations of clouds, spanning the 57 years 1952-2008 for ship data and the 39 years 1971-2009 for land station data. In addition to the cloud portion of the synoptic report, each edited report also includes the associated pressure, present weather, wind, air temperature, and dew point (and sea surface temperature over oceans). This data set is called the "Extended Edited Cloud Report Archive" (EECRA). The EECRA is based solely on visual cloud observations from weather stations, reported in the WMO synoptic code (WMO, 1974). Reports must contain cloud-type information to be included in the archive. Past data sources include those from the Fleet Numerical Oceanographic Center (FNOC, 1971-1976) and the National Centers for Environmental Prediction (NCEP, 1977-1996). This update uses data from a new source, the 'Integrated Surface Database' (ISD, 1997-2009; Smith et al., 2011). Our past analyses of the EECRA identified a subset of 5388 weather stations that were determined to produce reliable day and night observations of cloud amount and type. The update contains observations only from this subset of stations. Details concerning processing, previous problems, contents, and comments are available in the archive's original documentation . The EECRA contains about 81 million cloud observations from ships and 380 million from land stations. The data files have been compressed using unix. Unix/linux users can "uncompress" or "gunzip" the files after downloading. If you're interested in the NDP-026C database, then you'll also want to explore its related data products, NDP-026D and NDP-026E.

本数据库包含全球范围的地面天气实况报告，这些报告源自多个可用数据集。这些报告经过处理、编辑与重写，形成了一个包含单条云观测记录的数据集：其中船载数据覆盖1952-2008年的57年，陆地站数据覆盖1971-2009年的39年。除天气实况报告中的云相关部分外，每条编辑后的报告还包含关联的气压、当前天气、风况、气温、露点（以及海洋区域的海表温度）。该数据集被命名为“扩展编辑云报告档案库”（Extended Edited Cloud Report Archive，简称EECRA）。EECRA完全基于气象站的目视云观测数据，这些数据以世界气象组织（WMO）1974年发布的天气实况编码格式记录。只有包含云类型信息的报告才会被纳入该档案库。历史数据源包括舰队数值海洋学中心（Fleet Numerical Oceanographic Center，简称FNOC，1971-1976年）与美国国家环境预测中心（National Centers for Environmental Prediction，简称NCEP，1977-1996年）的数据。本次更新采用了新数据源——综合地面数据库（Integrated Surface Database，简称ISD，1997-2009年；Smith等人，2011）。我们此前对EECRA的分析筛选出5388个气象站子集，这些站点被证实能够提供可靠的昼夜云量与云类型观测数据。本次更新仅包含该子集站点的观测记录。关于数据处理、历史问题、内容及说明的详细信息可查阅档案库原始文档。EECRA包含约8100万条船载云观测记录与3.8亿条陆地站云观测记录。数据文件采用Unix格式压缩，Unix/Linux用户可在下载后使用“uncompress”或“gunzip”命令解压文件。若您对NDP-026C数据库感兴趣，建议同时探索其相关数据产品NDP-026D与NDP-026E。