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

本数据产品包含经过质量控制的、采用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方案获取的原生采样分辨率数据。野外环境下，水样与空气完成平衡处理；分别采集预平衡状态下的参考空气样本与平衡后空气样本，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。数据使用者应参考《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与质量平衡方程，由采集样本计算对应地表水溶解态二氧化碳、甲烷及一氧化二氮浓度的操作建议。如需获取更多细节，请查阅本数据产品详情网页“文档”板块所列的用户指南、采样方案及科学设计文档。

数据延迟：
针对下载数据包中的各数据表，野外数据和/或样本采集至数据发布的预期耗时（单位：天）如下所示，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