Camels Chem (1980-2018)

The CAMELS-Chem dataset is a comprehensive collection of stream water chemistry data, atmospheric deposition data, and catchment attribute data for 516 minimally impacted headwater catchments across the continental United States. The dataset spans a period of 39 years, from 1980 through 2018, and includes 18 common stream water chemistry constituents, such as Al, Ca, Cl, Dissolved Organic Carbon, Total Organic Carbon, HCO3, K, Mg, Na, Total Dissolved Nitrogen, NO3, Dissolved Oxygen, pH, Si, SO4, and water temperature. Additionally, the dataset provides annual wet deposition loads for several key components. The dataset is based on the existing CAMELS dataset, which provides catchment attribute data such as topography, climate, land cover, soil, and geology. In CAMELS-Chem, this catchment attribute data is paired with atmospheric deposition data from the National Atmospheric Deposition Program and water chemistry data and instantaneous discharge from the US Geological Survey. The dataset also includes paired instantaneous and discharge measurements for all chemistry samples.
The catchment attribute data files used in the CAMELS-Chem dataset were downloaded from the CAMELS website (https://ral.ucar.edu/solutions/products/camels

CAMELS-Chem数据集是一套针对美国大陆范围内516个受人类干扰极小的源头集水区的综合数据集，涵盖河流水化学数据、大气沉降数据与集水区属性数据。该数据集的时间跨度为39年（1980年至2018年），包含18种常见河流水化学组分，具体包括铝（Al）、钙（Ca）、氯（Cl）、溶解性有机碳（Dissolved Organic Carbon）、总有机碳（Total Organic Carbon）、碳酸氢根（HCO3）、钾（K）、镁（Mg）、钠（Na）、总溶解态氮（Total Dissolved Nitrogen）、硝态氮（NO3）、溶解氧（Dissolved Oxygen）、pH值、硅（Si）、硫酸盐（SO4）以及水温。此外，该数据集还提供了若干关键组分的年度湿沉降负荷。本数据集依托已公开的CAMELS数据集构建，后者提供地形、气候、土地覆盖、土壤及地质等集水区属性数据。在CAMELS-Chem中，上述集水区属性数据与来自国家大气沉降项目（National Atmospheric Deposition Program）的大气沉降数据、美国地质调查局（US Geological Survey）的水化学数据及瞬时流量数据完成匹配整合。数据集还包含所有化学样品对应的瞬时流量配对测量数据。
CAMELS-Chem数据集所使用的集水区属性数据文件均从CAMELS官方网站（https://ral.ucar.edu/solutions/products/camels）下载获取。