DOI: 10.5061/dryad.rn8pk0p5n
title: High-frequency measurements of aeolian saltation flux: time series data

description: High-frequency (25-50 Hz) coupled observations of wind speed and
 aeolian saltation flux (i.e, the wind-blown movement of sand)
 were measured at three field sites: Jericoacoara, Brazil; Rancho
 Guadalupe, California; and Oceano, California. The dataset
 provided here contains the full record of raw and processed time series of
 saltation flux and wind speed measured at multiple heights above the
 sediment surface.
description: Data were collected at three field sites: 
 <strong>Jericoacoara</strong>, Ceará, Brazil
 (2.7969°S, 40.4837°W): 2014-11-13 to 2014-11-20 
 <strong>Rancho Guadalupe</strong>, California, United States
 (34.9592°N, 120.6431°W): 2015-03-23 to 2015-03-24 
 <strong>Oceano</strong>, California, United States (35.0287°N,
 120.6277°W): 2015-05-15 to 2015-06-04 Data
 are reported in two ways: 
 <strong>"Daily"</strong> time series are subdivided
 among files covering the maximum available durations of continuous
 monitoring, up to a full field day. 
 <strong>"30 Minute"</strong> time series are
 subdivided among files covering discrete 30 minute intervals, for ease and
 comparability of analysis. A table of derived values (shear velocity,
 saltation flux, etc.) for these 30-minute intervals is provided at the
 following link: http://doi.org/10.5281/zenodo.291798  The following "raw" data files are provided with this data set: <strong>Partial saltation flux </strong>(<em>"[Site]_[Date]_[StartTime]_[EndTime]_PartialFlux.txt")</em>:<strong> </strong>Rates of detected sand movement at specific heights, as measured by Wenglor YH03PCT8 optical particle counters. Saltation fluxes were measured at 25 Hz. Metadata on variable names and units are provided in accompanying metadata files (<em>"...FluxMetadata.txt"</em>), as are sensor heights in meters (<em>"...FluxHeights_m.txt"</em>). <strong>Wind velocity </strong>(<em>"[Site]_[Date]_[StartTime]_[EndTime]_Wind_[SensorName]_z[SensorHeight].txt"</em>): Three-dimensional vectors for horizontal (<em>u</em>, <em>v</em>) and vertical (<em>w</em>) wind speed, measured using sonic anemometers. Data were recorded at 25 Hz at Jericoacoara and Rancho Guadalupe, and at 50 Hz at Oceano. Multiple anemometers, distinguished by their names (i.e., U1, U2, ...; or S1, S2, ...) were deployed at distinctive heights. Names of anemometers and deployment heights of anemometers (in mm above the ground surface) are included in the filenames. Metadata describing variable names and units are provided in accompanying metadata files (<em>"...WindMetadata.txt"</em>). A streamline correction has not been applied to the wind data provided here. Specific information about the choice and deployment anemometers is provided in Martin et al., 2018, "High-frequency measurements of aeolian saltation flux: Field-based methodology and applications", <em>Aeolian Research, 30,</em> 97-114, http://doi.org/10.1016/j.aeolia.2017.12.003 The following "processed" data files are provided with this data set: <strong>"Total" saltation flux </strong>(<em>"[Site]_[Date]_[StartTime]_[EndTime]_Flux.txt" or "...TotalFlux.txt")</em>: Vertically integrated saltation flux, determined from the profile of partial saltation fluxes and calibrated to absolute saltation mass fluxes collected in adjacent BSNE saltation sand traps. Metadata on variable names and units are provided in accompanying metadata files (<em>"...FluxMetadata.txt"</em>). The methods for this calibration are described in detail in Martin et al., 2018, "High-frequency measurements of aeolian saltation flux: Field-based methodology and applications", <em>Aeolian Research, 30,</em> 97-114, http://doi.org/10.1016/j.aeolia.2017.12.003.  <strong>Interpolated wind velocity </strong>(<em>"[Site]_[Date]_[StartTime]_[EndTime]_Wind_[SensorName]_z[SensorHeight]_Interpolated.txt"</em>)<strong>: </strong>Three-dimensional vectors for horizontal (<em>u</em>, <em>v</em>) and vertical (<em>w</em>) wind speed, measured using sonic anemometers, and interpolated to provide continuous time series. A linear interpolation was applied to all missing data points or data points flagged as erroneous by the sensor. Metadata describing variable names and units are provided in accompanying metadata files (<em>"...WindMetadata_Interpolated.txt"</em>). A streamline correction has not been applied to the wind data provided here. The full methodology for capturing and processing these wind and saltation data are described in Martin et al., 2018, "High-frequency measurements of aeolian saltation flux: Field-based methodology and applications", <em>Aeolian Research, 30,</em> 97-114, http://doi.org/10.1016/j.aeolia.2017.12.003. 
description: Full metadata information are provided in "Methods"
 (above) and in the files themselves. Additional contextual information can
 be found in Martin et al., 2018, "High-frequency measurements of
 aeolian saltation flux: Field-based methodology and applications",
 <em>Aeolian Research, 30,</em> 97-114, http://doi.org/10.1016/j.aeolia.2017.12.003.