Data · collection
Antarctic Pack Ice Seals Project (APIS) Acoustic Data for the Eastern Ross Sea 2000
Listed in NASA Earthdata CMR
APIS (Antarctic Pack Ice Seals) was an international program formulated by the SCAR Group on Specialists on Seals to consider the functional significance of upper trophic level predators in the Antarctic pack ice zone and to investigate the seals' interactions with their biological and physical environment.
Description
The US component assessed prey, predators, and environmental variables in the eastern Ross Sea (ca. 67 - 77.5 degrees S and 129 - 180 degrees W) from December 1999 to February 2000.
This data set contains acoustic data collected using a Hydroacoustics Technology Inc. (HTI) Model 244 Multi-Frequency System with two transducers (38 and 120 kHz) operating on fast-multiplexed mode. Data collection includes real-time integration of the acoustic signal in 1 m depth bins and the raw, unthresholded digitized signal stored on Digital Audio Tapes.
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Sixteen gigabytes of integrated acoustic data were collected plus 54 DAT tapes of raw data. All data were collected using a FM slide (chirp) coded 5 ms pulses, with a slide bandwidth of 10 kHz. Matched filter processing of these pulses resulted in an effective pulse resolution (output pulse width) of 0.18 ms.
The DAT tapes were reprocessed to correct for calibration offsets based on field standard target sphere measurements and to correct for noise interference for the 120 kHz data. The 38 kHz data was not reanalyzed as it contained much higher and variable noise interference. Data are available as relative backscattering (SV) and as absolute estimates of target density based on in situ sigma scaling.
The reprocessing was performed by HTI.
Links
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214613799-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214613799-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Acoustic Scattering · Animals Invertebrates · Birds · Fish · Mammals · Marine Ecosystems · Not provided
- Inferred from text
- Audio 75%
Provenance · 1 source records, 14 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214613799-SCIOPS | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/animals-invertebrates | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/animals-vertebrates/birds | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/animals-vertebrates/fish | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/animals-vertebrates/mammals | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biosphere/ecosystems/marine-ecosystems | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/ocean-acoustics/acoustic-scattering | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:audio | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |