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Description

This release consists of flux tower measurements of the exchange of energy and mass between the surface and the atmospheric boundary-layer using eddy covariance techniques. Data were processed using PyFluxPro (v3.5.0) as described by Isaac et al. (2017). PyFluxPro produces a final, gap-filled product with Net Ecosystem Exchange (NEE) partitioned into Gross Primary Productivity (GPP) and Ecosystem Respiration (ER).

The Otway flux station was located at Narrinda South in south west Victoria, Australia.The pasture was grazed by dairy cattle with average grass height of 0.1 m. Annual average rainfall at the site was around 800 mm and was only moderately seasonal. Mean daily temperature ranged from 25 °C in February to 12 °C in July. The flux station was situated on a 10 m tower. Fluxes of heat, water vapour and carbon dioxide were measured using the open-path eddy covariance technique. Supplementary measurements included temperature, humidity, rainfall, total solar, photosynthetically active radiation (PAR) and net radiation. Soil temperature and heat flux were also measured. The Otway flux station was established in February 2007 on private land at Nirranda South and managed by CSIRO Marine and Atmospheric Research staff as part of the Cooperative Research Centre for Greenhouse Gas Technologies.

Credit
We at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.

The Otway flux station managed by CSIRO Marine and Atmospheric Research staff as part of the Cooperative Research Centre for Greenhouse Gas Technologies.
The Otway flux station is supported by CO2CRC. Equipment was provided by CO2CRC.

Purpose
The purpose of the Otway flux station was to:

measure exchanges of carbon dioxide, water vapour and energy between the soil and the atmosphere using micrometeorological techniques

participate in the atmospheric monitoring strategy, which was developed by CO2CRC researchers in CSIRO, and is based on the effects of hypothetical storage leaks (point and diffuse) simulated by atmospheric dispersion models, over several distance scales at the Otway site

The Otway Project included injection and geological storage of up to 100,000 tonnes of carbon dioxide together with the most extensive monitoring and verification program yet undertaken at a geosequestration site.

Data Processing

File naming convention

The NetCDF files follow the naming convention below:

SiteName_ProcessingLevel_FromDate_ToDate_Type.nc

SiteName: short name of the site
ProcessingLevel: file processing level (L3, L4, L5, L6)
FromDate: temporal interval (start), YYYYMMDD
ToDate: temporal interval (end), YYYYMMDD
Type (Level 6 only): Summary, Monthly, Daily, Cumulative, Annual

For the NetCDF files at Level 6 (L6), there are several additional 'aggregated' files. For example:

Summary: This file is a summary of the L6 data for daily, monthly, annual and cumulative data. The files Monthly to Annual below are combined together in one file.
Monthly: This file shows L6 monthly averages of the respective variables, e.g. AH, Fc, NEE, etc.
Daily: same as Monthly but with daily averages.
Cumulative: File showing cumulative values for ecosystem respiration, evapo-transpiration, gross primary product, net ecosystem exchange and production as well as precipitation.
Annual: same as Monthly but with annual averages.

Lineage

All flux raw data is subject to the quality control process OzFlux QA/QC to generate data from L1 to L6. Levels 3 to 6 are available for re-use. Datasets contain Quality Controls flags which will indicate when data quality is poor and has been filled from alternative sources. For more details, refer to Isaac et al. (2017).

Temporal coverage

From 8/11/2007 to 1/1/2011

Dates

Creation date

3/31/2023

Publication date

5/4/2024

Revision date

5/7/2024

Citation information

How to cite this collection:

Kitchen, M. (2024): Otway Flux Data Release 2023_v1. Version 2023_v1. Terrestrial Ecosystem Research Network. (Dataset). https://doi.org/10.25901/ckat-s546

Access data

These data can be accessed from following links:

Access metadata

Point-of-truth metadata URL

Parent Dataset

Otway Flux Data Collection

Rights and Licensing

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

TERN services are provided on an “as-is” and “as available” basis. Users use any TERN services at their discretion and risk. They will be solely responsible for any damage or loss whatsoever that results from such use including use of any data obtained through TERN and any analysis performed using the TERN infrastructure.

Web links to and from external, third party websites should not be construed as implying any relationships with and/or endorsement of the external site or its content by TERN.

Please advise any work or publications that use this data via the online form at https://www.tern.org.au/research-publications/#reporting

Please cite this dataset as {Author} ({PublicationYear}). {Title}. {Version, as appropriate}. Terrestrial Ecosystem Research Network. Dataset. {Identifier}.

Keywords

Parameters

Platforms

Otway Flux Station

Instruments

ANZSRC - FOR

Horizontal Resolution

Point Resolution

Temporal Resolution

Hourly - < Daily

Topic Categories

Climatology/meteorology/atmosphere

User Defined

AU-Otw
CO2CRC Otway Project

People and Organisation

Authors

Kitchen, Mark

Point of Contact

Publisher

Terrestrial Ecosystem Research Network

Distributor's Organisation

Terrestrial Ecosystem Research Network

Publications

Publications

Data Quality

Data Quality

Data Quality Assessment Scope:

Processing levels

Under each of the data release directories, the netcdf files are organised by processing levels (L3, L4, L5 and L6):
- L3 (Level 3) processing applies a range of quality assurance/quality control measures (QA/QC) to the L1 data. The variable names are mapped to the standard variable names (CF 1.8) as part of this step. The L3 netCDF file is then the starting point for all further processing stages.
- L4 (Level 4) processing fills gaps in the radiation, meteorological and soil quantities utilising AWS (automated weather station), ACCESS-G (Australian Community Climate and Earth-System Simulator) and ERA5 (the fifth generation ECMWF atmospheric reanalysis of the global climate).
- L5 (Level 5) processing fills gaps in the flux data employing the artificial neural network SOLO (self-organising linear output map).
- L6 (Level 6) processing partitions the gap-filled NEE into GPP and ER.
Each processing level has two sub-folders ‘default’ and ‘site_pi’:
- default: contains files processed using PyFluxPro
- site_pi: contains files processed by the principal investigators of the site.
If the data quality is poor, the data is filled from alternative sources. Filled data can be identified by the Quality Controls flags in the dataset. Quality control checks include:
- range checks for plausible limits
- spike detection
- dependency on other variables
- manual rejection of date ranges
Specific checks applied to the sonic and IRGA data include rejection of points based on the sonic and IRGA diagnostic values and on either automatic gain control (AGC) or CO₂ and H₂O signal strength, depending upon the configuration of the IRGA.

Otway Flux Tower was established in 2007, and stopped measuring in early 2011. The processed data release is currently ongoing, biannually.
Isaac P., Cleverly J., McHugh I., van Gorsel E., Ewenz C. and Beringer, J. (2017). OzFlux data: network integration from collection to curation, Biogeosciences, 14: 2903-2928

Additional information

Method Documentation

Collections

Otway Flux Data Collection

Related datasets

with matching subjects

Access data

Contacts

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
QLD 4068
Australia

Spatial coverage

Spatial description

Nirranda South, Victoria, Australia.