README

Overview

This repository contains hydrologic data collected from the Rivendell field site at the Eel River Critical Zone Observatory as described in Lee et al. Water sources for coastal forest trees correctly identified through centrifugation of xylem water from sapwood cores but not cryogenic vacuum extraction.  The datasets are water stable isotope measurements of precipitation, xylem, groundwater, and vadose zone pore water samples from the site.

Each data file is formatted as a CSV and includes time-stamped observations. Below, we describe a list of column names that applies to each of the isotope datasets. 
Water Stable Isotope Data

Filenames: 
Groundwater_isotopes.csv	Groundwater from wells
Solid_isotopes.csv		Soils and weathered bedrock dry augered
Precip_isotopes.csv		Precipitation 
VMS_isotopes.csv: 		Vadose zone pore waters from the Vadose Zone Monitoring System
Tree_isotopes.csv:		Tree samples

Description: These files contain water stable isotope measurements, along with sample metadata, collection details, and site information.

Columns:
		Sample Information:
		ERCZO ID: Unique identifier for the sample.
		Original Sample Vial Label: Label assigned to the sample vial.
		Date Collected: Date the sample was collected (YYYY-MM-DD).
		Time Collected: Time the sample was collected (HH:MM).
		Site: General site location of the sample.
		Location: Specific sampling location within the site.
		Sample Type: Type of sample collected (e.g., groundwater, xylem water).
		Sample Type II: Additional classification of the sample.
		Tree Tag, Tree tag, Tree tag 2: Identifiers for sampled trees (if applicable).
		Environmental & Collection Metadata:
		Species (common), Species (scientific): Common and scientific names of sampled vegetation.
		Well water level (m): Groundwater level in the well at the time of sampling (m).
		Depth (m), Depth (cm), Depth (ft): Sample collection depth in different units.
		Gravimetric moisture content (g/g): Gravimetric moisture content measurement.
		Collected by: Name of the collector.
		Sampling Notes: Additional notes on the sampling process.
		Isotope Analysis & Instrumentation:
		dD Instrument, dO Instrument: Instruments used for ?D and ???O measurements.
		HD run ID, GB run ID: Run IDs for isotope analysis.
		dD: Measured ?D value.
		dO: Measured ???O value.
		Additional Metadata:
		Sample Vial Location: Storage location of the sample.
		VMS Sleeve, VMS Port: Identification for VMS sampling ports.
		Adjacent well groundwater depth at time of sampling (m): Nearby well water level during collection.
		Energetic State: Energy state classification of the sample.
		Date collection started, Time collection started: Timestamp of sample collection initiation.
		Extraction Method: Method used for extracting water.
		Centrifuge Duration (hr), Water Centrifuge Duration (hr): Time spent centrifuging the sample.
		Analysis Notes: Additional comments related to analysis.
		timestamp, timestamp_rounded: Exact timestamps of data recording.
		waterYear: Water year corresponding to the observation.
		date, datetime: Alternative date formats for ease of analysis.

Usage Notes
		All timestamps are in YYYY-MM-DD format unless otherwise specified.
		Missing values are represented as NaN.
		Please cite the dataset properly when using it in research publications.