RELEASE-2022

Net surface-atmosphere exchange, or “flux” quantifies how much heat, water (H2O) and carbon dioxide (CO2) are transferred between an ecosystem and the atmosphere. Fluxes are useful in a variety scientific applications, including to study ecosystem processes, to interpret and calibrate satellite observations of the earth system, and to constrain ecosystem and earth system models. One of the most direct approaches to observe the net surface-atmosphere exchange is the in-situ [eddy-covariance method](https://youtu.be/CR4Anc8Mkas). Calculation of the net surface-atmosphere exchange involves the estimation of at least two major terms (assuming horizontally homogenous surface conditions): the turbulent flux and the storage flux. In addition, stable isotope measurements of CO2 and H2O within and above the ecosystem canopy can support the subsequent partitioning of the net surface-atmosphere exchange into ecosystem constituent fluxes. For example, partitioning CO2 into photosynthesis and respiration, or evaporation and transpiration in the case of H2O. For data product and algorithm details please see [NEON.DOC.004571](http://data.neonscience.org/documents); in short: this data product bundle contains derived eddy-covariance data products and associated metadata in HDF5 format. Each file contains metadata about the file structure, table formats, and attributes. For more information on using HDF5 files, please visit The HDF Group website at https://www.hdfgroup.org/. Data, quality flags and metrics (qfqm), and uncertainty metrics (ucrt) are currently provided in folders using the following naming convention within the HDF5 file structure: `data_product_level`/`type_of_data_available`/`data_product_abbreviation` (e.g., “dp01/data/soni”). Empty folders within the file structure are being incrementally filled in future publications. The data products embedded in this bundle currently include the following: Data Product | Type of data available | Abbreviation | Temporal Resolution DP1.00002 Single aspirated air temperature | data, qfqm, ucrt | tempAirLvl | 1-min, 30-min DP1.00003 Triple aspirated air temperature | data, qfqm, ucrt | tempAirTop | 1-min, 30-min DP1.00007 3D wind speed, direction and sonic temperature | data, qfqm, ucrt | soni | 1-min, 30-min DP1.00010 3D wind attitude and motion reference | data, qfqm, ucrt | amrs | 1-min, 30-min DP1.00034 CO2 concentration - turbulent | data, qfqm, ucrt | co2Turb | 1-min, 30-min DP1.00035 H2O concentration - turbulent | data, qfqm, ucrt | h2oTurb | 1-min, 30-min DP1.00036 Atmospheric CO2 isotopes | data, qfqm, ucrt | isoCo2 | 9-min, 30-min DP1.00037 Atmospheric H2O isotopes | data, qfqm, ucrt | isoH2o | 9-min, 30-min DP1.00099 CO2 concentration - storage | data, qfqm, ucrt | co2Stor | 2-min, 30-min DP1.00100 H2O concentration - storage | data, qfqm, ucrt | h2oStor | 2-min, 30-min DP2.00008 CO2 concentration rate of change | data, qfqm | co2Stor | 30-min DP2.00009 H2O concentration rate of change | data, qfqm | h2oStor | 30-min DP2.00024 Temperature rate of change | data, qfqm | tempStor | 30-min DP3.00008 Temperature rate of change profile | data, qfqm | tempStor | 30-min DP3.00009 CO2 concentration rate of change profile | data, qfqm | co2Stor | 30-min DP3.00010 H2O concentration rate of change profile | data, qfqm | h2oStor | 30-min DP4.00002 Sensible heat flux | data, qfqm | fluxTemp | 30-min DP4.00007 Momentum flux | data, qfqm | fluxMome | 30-min DP4.00067 Carbon dioxide flux | data, qfqm | fluxCo2 | 30-min DP4.00137 Latent heat flux | data, qfqm | fluxH2o | 30-min DP4.00201 Flux footprint characteristics | data, qfqm | foot | 30-min Latency: Data collected in any given month are published during the second full week of the following month.