Continuous stream CO2 and temperature data and sensor calibration grab samples from five NEON sites (CARI, COMO, KING, MART, WALK), August 2021-April 2024.

This package contains: 1) sensor-based measurements of dissolved CO2 concentration and temperature, and 2) dissolved CO2 concentration from grab samples that were used to calibrate the sensor data, collected at five stream sites in the NEON network (CARI- Caribou Creek, AK; COMO- Como Creek, CO; KING- Kings Creek, KS; MART- Martha Creek, WA; and WALK- Walker Branch, TN) between August 2021 - April 2024. The grab sample dataset contains a combination of samples collected by NEON (DP1.20097.001) and additional samples collected by project personnel. All samples were collected using the headspace equilibration method, and dissolved CO2 concentrations were calculated using the 'neonDissGas' R package (https://github.com/NEONScience/NEON-dissolved-gas). The sensor dataset contains CO2 concentrations measured with an eosGP CO2 gas probe, averaged to 15-minute intervals and corrected to align with grab sample concentrations using a site-specific grab versus sensor regression. Due to inaccuracies in the eosGP temperature data, we instead include the temperature data from NEON that was used to convert CO2 between units of ppmv and umol/L (DP1.20053.001 for CARI, KING, MART, and WALK, and data from the multiparameter sonde for COMO). All NEON data used in this data package references the RELEASE-2025 version of each data product (downloaded February 2025).本数据包涵盖两类数据：1）基于传感器获取的溶解二氧化碳（dissolved CO2）浓度与温度实测数据；2）用于校准传感器数据的瞬时水样（grab sample）溶解二氧化碳浓度数据。上述数据采集于美国国家生态观测网络（National Ecological Observatory Network，NEON）的5个溪流监测点位，具体包括：阿拉斯加州卡里布溪（CARI- Caribou Creek, AK）、科罗拉多州科莫溪（COMO- Como Creek, CO）、堪萨斯州金斯溪（KING- Kings Creek, KS）、华盛顿州玛莎溪（MART- Martha Creek, WA）和田纳西州沃克分支（WALK- Walker Branch, TN），采集时段为2021年8月至2024年4月。瞬时水样数据集整合了两类样品：由NEON采集的样品（数据产品编号DP1.20097.001），以及项目组额外采集的补充样品。所有样品均采用顶空平衡法采集，溶解二氧化碳浓度通过`neonDissGas` R语言包计算得到（代码仓库地址：https://github.com/NEONScience/NEON-dissolved-gas）。传感器数据集包含由eosGP二氧化碳气体探针测得的二氧化碳浓度数据，该数据已被处理为15分钟间隔的平均时序值，并通过针对各监测点位构建的瞬时水样-传感器回归模型进行校正，以匹配瞬时水样的浓度结果。鉴于eosGP温度数据存在偏差，本数据包改用NEON提供的温度数据，用于实现二氧化碳浓度在ppmv与μmol/L单位间的转换：其中CARI、KING、MART及WALK点位采用数据产品DP1.20053.001，COMO点位则采用多参数水质探头采集的温度数据。本数据包中使用的全部NEON数据，均来自各数据产品的RELEASE-2025版本（于2025年2月下载）。