Dissolved gases in surface water (DP1.20097.001)

This data product contains the quality-controlled, native sampling resolution data from NEON's surface water dissolved gas sampling protocol. Water samples are equilibrated with air in the field. Samples of reference air (pre-equilibration) and equilibrated air (post-equilibration) are sent to external facilities for analysis to determine carbon dioxide, methane, and nitrous oxide concentrations in the gas samples. Data users should refer to the user guide for dissolved gases in surface water ([`NEON_dissolvGasInWater_UserGuide`](http://data.neonscience.org/api/v0/documents/NEON_dissolvGasInWater_userGuide_vA)) for suggestions on how to calculate dissolved concentrations of carbon dioxide, methane, and nitrous oxide in the surface waters from which samples were collected using Henry's Law and mass balance equations. For additional details, see the user guide, protocols, and science design listed in the Documentation section in this data product's details webpage.

Latency:
The expected time from data and/or sample collection in the field to data publication is as follows, for each of the data tables (in days) in the downloaded data package. See the Data Product User Guide for more information.

sdg_externalLabData: 120

sdg_externalLabSummaryData: 14

sdg_fieldData: 30

sdg_fieldDataAir: 30

sdg_fieldDataProc: 30

sdg_fieldSuperParent: 30

本数据产品包含经质量管控的、保留原生采样分辨率的美国国家生态观测站网络（National Ecological Observatory Network, NEON）地表水溶解气体采样规程所采集的数据。野外环境下，将水样与空气进行平衡处理。采集预平衡阶段的参考空气样本与平衡完成后的平衡空气样本，送至外部实验室开展分析，以测定气体样本中的二氧化碳、甲烷及一氧化二氮浓度。数据使用者可参考《地表水溶解气体用户指南》（[`NEON_dissolvGasInWater_UserGuide`](http://data.neonscience.org/api/v0/documents/NEON_dissolvGasInWater_userGuide_vA)），该指南提供了利用亨利定律（Henry's Law）与质量平衡方程，由采集样本的地表水计算其中二氧化碳、甲烷及一氧化二氮溶解浓度的方法指引。如需获取更多细节，请查阅本数据产品详情网页的文档板块中列出的用户指南、采样规程及科学设计方案。

数据延迟：
针对下载数据包中的各数据表，野外数据和/或样本采集至数据正式发布的预期时长（单位：天）如下。更多信息请参阅数据产品用户指南。
sdg_externalLabData: 120
sdg_externalLabSummaryData: 14
sdg_fieldData: 30
sdg_fieldDataAir: 30
sdg_fieldDataProc: 30
sdg_fieldSuperParent: 30

搜集汇总

背景与挑战

背景概述

该数据集包含NEON（国家生态观测站网络）采集的表面水溶解气体质量控制的原始数据，主要测量二氧化碳、甲烷和一氧化二氮的浓度。数据覆盖多种水体类型和广泛的地理范围，时间跨度为2014年至2022年。