AquaMatch Chlorophyll a Data from Water Quality Portal: ~1970-2024

This dataset, “AquaMatch Chlorophyll a Data from Water Quality Portal ~1970-2024”, is a component of a forthcoming update to AquaSat (Ross et al., 2019), AquaSat version 2 (“v2”). The overarching purpose of AquaSat V2 is to emphasize the individual parts of the AquaSat pipeline that make-up the matchups between satellite and in-situ measurements. As such, we have greatly expanded and improved upon the AquaSat chlorophyll a dataset in two ways: First, we have incorporated additional recent in situ data beyond what was available at the publication of AquaSat. Second, we have created a data quality tiering system to provide end-users with more guidance on data usage. In this schema we have three tiers: restrictive data that are verifiably self-similar across organizations and time-periods and can be considered highly reliable; narrowed data that we have good reason to believe are self-similar, but for which we can not verify full compatibility across data providers; and inclusive data, which are assumed to be reliable and are harmonized to our best ability given the information available from the data provider. We have also added flag columns to help users understand complexities of the available depth and field sampling data. This dataset is a derived data product created using records downloaded from the Water Quality Portal (WQP) spanning January 6, 1970, to June 20, 2024. The WQP is a data warehouse for water-related data measured or observed within the United States and US Territories managed by the Environmental Protection Agency, United States Geological Survey, and the National Water Quality Monitoring Council. The dataset does not contain remote sensing matchups but can be paired with Landsat surface reflectances using the pipeline presented in Ross et al. (2019). Ross, M. R. V., Topp, S. N., Appling, A. P., Yang, X., Kuhn, C., Butman, D. et al. (2019). AquaSat: A data set to enable remote sensing of water quality for inland waters. Water Resources Research, 55, 10012–10025. https://doi.org/10.1029/2019WR024883

本数据集为「AquaMatch叶绿素a（Chlorophyll a）数据——来自水质门户（Water Quality Portal），1970~2024年」，是即将发布的AquaSat（Ross等，2019年）第二版（v2）更新项目的组成部分。AquaSat V2的核心目标是凸显AquaSat流程中，用于构建卫星与原位（in-situ）测量匹配对的各个环节。据此，我们从两方面对AquaSat叶绿素a数据集进行了大幅扩充与优化：其一，纳入了AquaSat发表时未覆盖的更多最新原位数据；其二，构建了数据质量分级体系，为终端用户提供更全面的数据使用指导。本分级框架共设三级：第一级为限制性数据，经验证可在不同机构与不同时段间保持自一致性，可靠性极高；第二级为限定性数据，有充分依据表明其具备自一致性，但无法验证各数据提供方间的完全兼容性；第三级为包容性数据，默认具备可靠性，并已依据数据提供方提供的信息进行了最大程度的标准化处理。此外，我们新增了标记列，以帮助用户理解现有水深与野外采样数据的复杂性。本数据集为衍生数据产品，基于从水质门户（Water Quality Portal，WQP）下载的记录生成，时间跨度为1970年1月6日至2024年6月20日。水质门户（Water Quality Portal，WQP）是由美国环境保护署（Environmental Protection Agency）、美国地质调查局（United States Geological Survey）与国家水质监测委员会（National Water Quality Monitoring Council）联合管理的，用于存储美国本土及美属领地内各类水环境相关实测与观测数据的数据仓库。本数据集未包含遥感匹配对，但可通过Ross等（2019年）提出的流程与陆地卫星（Landsat）地表反射率数据进行匹配配对。Ross, M. R. V.、Topp, S. N.、Appling, A. P.、Yang, X.、Kuhn, C.、Butman, D. 等（2019年）. AquaSat：用于内陆水体水质遥感的数据集. 《水资源研究（Water Resources Research）》，55卷，10012–10025页. https://doi.org/10.1029/2019WR024883