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wdc-climate.de:5284144 eng; USA collection swifta John Case Penn State https://www.acs.psu.edu pointOfContact 2025-03-24T11:22:30 ISO 19115 ISO 19115-2:2009 SWIFT-A: Shallow Water Ice Fracturing Tracking and Acoustics 2025-06-27 publication 1 swifta doi:10.26050/WDCC/swifta John Case Penn State https://www.acs.psu.edu Email: jackcase97@gmail.com principalInvestigator John Case Penn State https://www.acs.psu.edu Email: jackcase97@gmail.com author Dr. Daniel Brown Penn State https://www.acs.psu.edu Email: dcb19@psu.edu author Dr. Andrew Barnard Michigan Tech https://www.mtu.edu Email: barnard@mtu.edu author WDCC publisher A data set containing passive acoustic data from microphones, geophones and hydrophones placed on a frozen lake for 1 week. The experiment was conducted in February of 2024 on Portage Lake in the Upper Peninsula of Michigan, USA.The primary passive data is structured in 1-minute HDF5 files, each containing 8 or 11 channels of ambient ice fracture time series data recorded at 52100 Hz sample rate. The sensors were placed on/below ice ~254mm thick over water ~600mm deep. The secondary data set contains HDF5 files of in a similar structure to the first data set, but contain active impact responses in an array of locations around each acoustic sensor. Active impacts were created with a force hammer at a pre-determined set of impact locations around each acoustic array. John Case Penn State https://www.acs.psu.edu pointOfContact HDF5 Ice sheets acoustics fracture ice CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ eng; USA -88.5529 -88.4287 47.0958 47.1201 standard 2024-02-25 2024-03-05 info:eu-repo/grantAgreement/PIPELINE//N000142312656/US//N000142312656 relative_humidity relative_humidity [CF-Standard Name]; unit: 1 wind_speed_of_gust Speed is the magnitude of velocity. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity. A gust is a sudden brief period of high wind speed. In an observed timeseries of wind speed, the gust wind speed can be indicated by a cell_methods of maximum for the time-interval. In an atmospheric model which has a parametrised calculation of gustiness, the gust wind speed may be separately diagnosed from the wind speed.[CF-Standard Name]; unit: m s-1 air_pressure air_pressure [CF-Standard Name]; unit: Pa wind_from_direction Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) In meteorological reports, the direction of the wind vector is usually (but not always) given as the direction from which it is blowing (wind_from_direction) (westerly, northerly, etc.). In other contexts, such as atmospheric modelling, it is often natural to give the direction in the usual manner of vectors as the heading or the direction to which it is blowing (wind_to_direction) (eastward, southward, etc.) "from_direction" is used in the construction X_from_direction and indicates the direction from which the velocity vector of X is coming. [CF-Standard Name]; unit: degree air_temperature Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: degC surface_velocity_of_ice_sheet not filled; unit: m s-1 dew_point_temperature Dew point temperature is the temperature at which a parcel of air reaches saturation upon being cooled at constant pressure and specific humidity. [CF-Standard Name]; unit: degC wind_speed Speed is the magnitude of velocity. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity.[CF-Standard Name]; unit: m s-1 sound_pressure_in_water Sound pressure is the difference from the local ambient pressure caused by a sound wave at a particular location and time [CF-Standard Name]; unit: Pa ice_surface_impact_hammer_force not filled; unit: N solar_irradiance The quantity with standard name solar_irradiance, often called Total Solar Irradiance (TSI), is the radiation from the sun integrated over the whole electromagnetic spectrum and over the entire solar disk. The quantity applies outside the atmosphere, by default at a distance of one astronomical unit from the sun, but a coordinate or scalar coordinate variable of distance_from_sun can be used to specify a value other than the default. "Irradiance" means the power per unit area (called radiative flux in other standard names), the area being normal to the direction of flow of the radiant energy.; unit: W m-2 sound_pressure_in_air Sound pressure is the difference from the local ambient pressure caused by a sound wave at a particular location and time [CF-Standard Name]; unit: Pa HDF5 4106752 https://www.wdc-climate.de/ui/entry?acronym=swifta information collection