Reaeration field and lab collection (DP1.20190.001)

This data product contains the quality-controlled, native sampling resolution data from NEON's wadeable stream reaeration sampling protocol. During most reaeration experiments, grab samples of stream water at NEON aquatic sites are collected in streams at 4 sampling locations downstream of a continuous injection of an inert gas (SF6) and conservative tracer (NaCl or NaBr). Background samples are collected prior to tracer injection and are analyzed for background salt tracer concentrations. Plateau samples are collected once the tracer concentration reaches a constant concentration (as measured by conductivity) and 5 replicate samples from each station are analyzed for both salt and gas tracer concentrations. Data users should refer to the user guide for reaeration and salt-based discharge see `NEON_ReaerSaltBasedQ_userGuide` for suggestions on how to calculate reaeration rates from the published data packages. For additional details, see the user guide, protocols, and science design listed in the Documentation section in this data product's details webpage. During some reaeration experiments, denoted by injectionType “model - slug” or “model - CRI”, only the conservative tracer is injected, either via slug or constant rate, (i.e., inert gas is not injected). See NEON Data Product User Guide to Reaeration (DP1.20190.001) and Salt-based Discharge Sampling (DP1.20193.001) for more detail about when and where model type injections are used.

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.

rea_backgroundFieldCondData: 30

rea_backgroundFieldSaltData: 30

rea_conductivityFieldData: 30

rea_externalLabDataGas: 120

rea_externalLabDataSalt: 120

rea_fieldData: 30

rea_plateauMeasurementFieldData: 30

rea_plateauSampleFieldData: 30

rea_widthFieldData: 30

sdg_externalLabSummaryData: 14

本数据产品包含经质量管控的、采用原生采样分辨率的美国国家生态观测站网络（National Ecological Observatory Network, NEON）可涉水溪流复氧采样协议相关原始数据。在多数复氧实验中，研究人员会在NEON水生观测站点的溪流中，于惰性气体（六氟化硫，SF6）与保守示踪剂（氯化钠NaCl或溴化钠NaBr）连续注入点下游的4个采样点位采集溪流瞬时水样。示踪剂注入前需采集背景样品，并测定其中的盐类示踪剂本底浓度。当示踪剂浓度达到恒定值（通过电导率测定）后，采集平台期样品；每个采样点位需采集5份平行样品，分别用于盐类与气体示踪剂的浓度分析。

数据使用者可参考`NEON_ReaerSaltBasedQ_userGuide`，以获取从已发布数据包中计算复氧速率的相关方法建议。如需获取更多细节，请查阅本数据产品详情网页“文档”板块中所列的用户指南、采样协议及科学设计方案。

在部分复氧实验中，若注入类型标注为"model - slug"或"model - CRI"，则仅注入保守示踪剂，可采用脉冲注入或恒速注入方式（即不注入惰性气体）。如需了解此类模型式注入的使用场景与时机的更多细节，请查阅NEON《复氧数据产品用户指南》（DP1.20190.001）与《基于盐度的径流量采样用户指南》（DP1.20193.001）。

### 数据发布延迟周期
下载数据包内各数据表的野外数据与/或样品采集至正式发布的预期耗时（单位：天）如下，更多详情请参阅数据产品用户指南：
`rea_backgroundFieldCondData`: 30
`rea_backgroundFieldSaltData`: 30
`rea_conductivityFieldData`: 30
`rea_externalLabDataGas`: 120
`rea_externalLabDataSalt`: 120
`rea_fieldData`: 30
`rea_plateauMeasurementFieldData`: 30
`rea_plateauSampleFieldData`: 30
`rea_widthFieldData`: 30
`sdg_externalLabSummaryData`: 14