Global land surface atmospheric variables from 1755 to 2020 from comprehensive in-situ observations

This set of data holdings provides access to data collected from land surface meteorological observations across the globe. Data are available at the observational level and also at daily and monthly aggregations. Data have been collated and harmonised and quality control checks have been performed, but no attempt has been made to assess for potential biases. Data are provided for a range of commonly observed variables.
Surface meteorological observations taken by a broad variety of organisations, including but not limited to National Meteorological Services, are being collated, reconciled, and harmonised. This work provides data that can underpin the development of reanalyses products as well as the production of gridded products and data services.
Work is ongoing to prepare and analyse several hundred sources secured to date and new sources continue to accrue. Documentation on sources secured to date can be found in the inventory information provided in the documentation tab. Users with new sources are invited to upload these via the data deposition service for ingestion and consideration. Sources are available in a broad range of formats and frequently individual series have been shared multiple times. Steps have been undertaken to harmonise data formats and reconcile data sources to yield the longest possible individiual station records.
Station period-of-record varies on a station-by-station basis with most stations starting after 1950, but many stations extending much further back in time. Daily and monthly aggregations extend further back in time than sub-daily records in general. Periodic updates and reissues shall refresh historical holdings availability and will also build on aspects such as quality checking and flagging of data. Each such release will be accompanied by a version number increment and a reissue of the product user guide. Updates for recent observations are in process of being provided at a latency of 1-2 days for those stations that are operational and sharing data across the WMO Information System, starting with updates to the daily holdings.
Data are available for several commonly observed variables as described in the main variables table. Note that which variables are available varies by the chosen timescale of data aggregation and by station. To aid users an inventory of stations by name, location, start and end date, and variables available is provided in the documentation page differentiated by timescale. Attributes are described in the related-variables tables and users can choose whether to receive all attributes or solely essential attributes. Data are downloaded as comma-seperated values (CSV) files organised as one observations of one variable per row.
Users should ensure an appropriate assessment of long-term data quality prior to use in those applications which require consideration of such aspects.
More details about the land meteorological station holdings are available in the product user guide, and details around data formatting can be found in the common data model documentation, both of which can be found in the documentation section.
This work is being completed on behalf of C3S in sustained collaboration with colleagues at NOAA's National Centres for Environmental Information who are the WMO designated World Data Centre for meteorology.

本数据集汇集了全球陆地气象观测数据，旨在为用户提供全面的数据访问。数据不仅包含观测层面的信息，还涵盖了日度与月度汇总。数据经过整理、协调以及质量控制，但未对潜在偏差进行评估。数据涵盖了多种常见观测变量。众多组织，包括但不限于国家气象服务机构，所进行的地面气象观测数据被收集、核对并协调一致。此项工作旨在为再分析产品的开发以及网格化产品与数据服务的生产提供数据支持。目前，正在对数百个已获得的数据源进行准备与分析，且新的数据源持续增加。关于已获得数据源的文档可于文档标签页中的清单信息中查寻。拥有新数据源的用户被邀请通过数据沉积服务上传这些数据以供摄取和考虑。数据源以多种格式提供，且单个系列数据常被多次共享。已采取措施协调数据格式并核对数据源，以产生尽可能长的单个站点记录。每个站点的记录期限因站而异，大部分站点始于1950年之后，但许多站点的记录期限可以追溯到更早的时间。日度和月度汇总的记录期限通常比子日记录更早。定期更新和再版将刷新历史持有数据可用性，并将基于质量检查和数据标记等方面进行改进。每次发布都将伴随版本号的增加和产品用户指南的再版。对于仍在运营并共享WMO信息系统数据的站点，最近观测的更新正在以1-2天的延迟提供。数据描述详见主要变量表，请注意，可用的变量根据数据汇总的时间尺度以及站点而异。为方便用户，文档页面提供了按名称、位置、起始和结束日期以及可用变量分级的站点清单。属性描述于相关变量表中，用户可以选择接收所有属性或仅接收必要属性。数据以逗号分隔值（CSV）文件形式下载，每行包含一个变量的一个观测值。用户在使用需要考虑长期数据质量的应用之前，应确保进行适当的评估。有关陆地气象站点持有的更多详细信息，可在产品用户指南中找到，而关于数据格式的详细信息则可在通用数据模型文档中找到，两者均可在文档部分找到。此项工作是在C3S的委托下，与NOAA国家环境信息中心的同事们持续合作完成的，该中心是WMO指定的气象世界数据中心。