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SWIFT-A: Shallow Water Ice Fracturing Tracking and Acoustics

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.

Simple

Date (Publication)
2025-06-27
Edition

1

Citation identifier
swifta
Citation identifier
doi:10.26050/WDCC/swifta
Principal investigator
  Penn State - John Case
https://www.acs.psu.edu
Author
  Penn State - John Case
https://www.acs.psu.edu
Author
  Penn State - Dr. Daniel Brown
https://www.acs.psu.edu
Author
  Michigan Tech - Dr. Andrew Barnard
https://www.mtu.edu
Publisher
  WDCC
Point of contact
  Penn State - John Case
https://www.acs.psu.edu
Name

HDF5

Keywords
  • Ice sheets

Keywords
  • acoustics

Keywords
  • fracture

Keywords
  • ice

Use limitation

CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/

Language

eng; USA

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Begin date
2024-02-25
End date
2024-03-05
Supplemental Information

info:eu-repo/grantAgreement/PIPELINE//N000142312656/US//N000142312656

Distribution format
  • HDF5 ()

Transfer size
4106752
OnLine resource
https://www.wdc-climate.de/ui/entry?acronym=swifta
Hierarchy level
collection
Attribute description
relative_humidity
Descriptor

relative_humidity [CF-Standard Name]; unit: 1

Attribute description
wind_speed_of_gust
Descriptor

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

Attribute description
air_pressure
Descriptor

air_pressure [CF-Standard Name]; unit: Pa

Attribute description
wind_from_direction
Descriptor

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

Attribute description
air_temperature
Descriptor

Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: degC

Attribute description
surface_velocity_of_ice_sheet
Descriptor

not filled; unit: m s-1

Attribute description
dew_point_temperature
Descriptor

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

Attribute description
wind_speed
Descriptor

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

Attribute description
sound_pressure_in_water
Descriptor

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

Attribute description
ice_surface_impact_hammer_force
Descriptor

not filled; unit: N

Attribute description
solar_irradiance
Descriptor

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

Attribute description
sound_pressure_in_air
Descriptor

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

File identifier
wdc-climate.de:5284144 XML
Metadata language

eng; USA

Hierarchy level
collection
Hierarchy level name

swifta

Date stamp
2025-03-24T11:22:30
Metadata standard name

ISO 19115

Metadata standard version

ISO 19115-2:2009

Point of contact
  Penn State - John Case
https://www.acs.psu.edu
 
 

Overviews

Spatial extent

N
S
E
W
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Keywords


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