TemperateReefBase Geonetwork Catalogue
Antarctic Circumnavigation Expedition 2017: HOSM data product
Reconstructed nonlinear surface from WAMOS (marine radar) data collected during the 3rd leg of Antarctic Circumnavigation Expedition, from the end of January to the end of March 2017.
WAMOS data (AAS_4434_ACE_WAMOS) are processed with the Higher Order Spectral Method (HOSM) to provide the nonlinear surface elevation and the corresponding spectrum of waves during ACE. A Montecarlo approach is adopted to reproduce the natural variability of the sea state and gain reliable statistics of the underlying nonlinear surface elevation. Details on the method can be found on Toffoli, Alessandro, et al. "Evolution of weakly nonlinear random directional waves: laboratory experiments and numerical simulations." Journal of Fluid Mechanics 664 (2010): 313-336.
File structure: Folder name corresponds to the time stamp of the input spectrum (yyyyMMddhhmmss) from AAS_4434_ACE_WAMOS.
Each folder contains:
1. The surface elevation for 250 random realisations at 10 instant in times from initialisation saved every 5 dominant wave periods apart (0,5,10,15,…,50 Tp). The ten digits name is structured as 0000NRRttt where NRR is the number of the random realisation (from 1 to 250) and ttt denotes the time index (from 0 to 10).
2. NEW_SPECTRUM.DAT the 2D spectrum (64x64) as a columnar vector of the initial spectrum read from the AAS_4434_ACE_WAMOS.
3. INPUT_SPECTRUM.DAT the 2D spectrum (256x256) as a columnar vector of the initial spectrum for the HOSM.
4. WAVENUMBERSX.DAT and WAVENUMBERSY.DAT the wavenumber in x and y respectively
5. PP_INFO.DAT contains the peak period (Tp) in seconds
6. RUN_INFO.DAT contains the resolution in x of the WAMOS spectrum (64), the resolution in y of the WAMOS spectrum (64), the delta x for the surface elevation in m, the delta y for the surface elevation in m. Subsequent parameters are flags for the HOSM method.
Waves in the Southern Ocean are the biggest on the planet. They exert extreme stresses on the coastline of the Sub-Antarctic Islands, which affects coastal morphology and the delicate natural environment that the coastline offers. In Antarctic waters, the sea ice cover reflects a large proportion of the wave energy, creating a complicated sea state close to the ice edge. The remaining proportion of the wave energy penetrates deep into the ice-covered ocean and breaks the ice into relatively small floes. Then, the waves herd the floes and cause them to collide and raft.
There is a lack of field data in the Sub-Antarctic and Antarctic Oceans. Thus, wave models are not well calibrated and perform poorly in these regions. Uncertainties relate to the difficulties to model the strong interactions between waves and currents (the Antarctic Circumpolar and tidal currents) and between waves and ice (reflected waves modify the incident field and ice floes affect transmission into the ice-covered ocean). Drawbacks in wave modelling undermine our understanding and ability to protect this delicate ocean and coastal environment.
Simple
Identification info
- Alternate title
- Antarctic Circumnavigation Expedition 2017: HOSM data product
- Date (Publication)
- 2022-09-21
- Edition
- 1
- Citation identifier
-
Dataset DOI
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2012-04-23
- Citation identifier
- ISO 26324:2012
- Citation identifier
- doi:10.26179/5b8378b160b02
Originator
Publisher
Principal investigator
Principal investigator
Principal investigator
Principal investigator
Collaborator
Collaborator
Collaborator
Collaborator
- Name
- CAASM Metadata
- Purpose
- The assessment of metocean conditions in the Southern Oceans
- Status
- Completed
Custodian
- Topic category
-
- Oceans
Extent
))
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 2017-01-22 2017-03-18
Extent
- Description
- Vertical Extent - Altitude
Vertical element
- Minimum value
- 0
- Maximum value
- 0
- Identifier
- urn:x-ogc:def:cs:EPSG:6499
- Name
- Vertical CS. Axis: height (H). Orientation: up. UoM: m.
- Identifier
- urn:x-ogc:def:axis:EPSG:114
- Name
- height
Extent
- Description
- Vertical Extent - Depth
Vertical element
- Minimum value
- 0
- Maximum value
- 0
- Identifier
- urn:x-ogc:def:cs:EPSG:6498
- Name
- Vertical CS. Axis: depth (D). Orientation: down. UoM: m.
- Identifier
- urn:x-ogc:def:axis:EPSG:113
- Name
- depth
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > OCEANS > OCEAN WAVES
- EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE SPECTRA
- EARTH SCIENCE > OCEANS > OCEAN WAVES > SEA STATE
- EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE HEIGHT
- Keywords
-
- HOSM
- NUMERICAL SIMULATIONS
- NONLINEAR WAVES
- NASA/GCMD Earth Science Keywords
-
- Computer > Computer
- NASA/GCMD Earth Science Keywords
-
- SHIPS
- R/V AKADEMIK TRESHNIKOV
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- AMD
- CEOS
- NASA/GCMD Earth Science Keywords
-
- GEOGRAPHIC REGION > POLAR
- OCEAN > SOUTHERN OCEAN
Resource constraints
- Use limitation
- This metadata record is publicly available.
Resource constraints
- Access constraints
- licence
- Other constraints
- These data are publicly available for download from the provided URL.
Resource constraints
- File type
- Portable Network Graphic
- Title
- Attribution 4.0 International (CC BY 4.0)
- Website
-
https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license
- Use constraints
- licence
- Other constraints
- This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4434_ACE_HOSM when using these data.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- Free
- Planned available datetime
- 2022-09-21T00:00:00
- Units of distribution
- GB
- Transfer size
- 195
- Distribution format
-
- Text
- OnLine resource
-
GET DATA > DIRECT DOWNLOAD
Download the dataset
- OnLine resource
-
PROJECT HOME PAGE
Public information for AAS project AAS_4434
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset.
Resource lineage
- Statement
- Nans in the reconstructed surfaces indicate numerical instability. Files containing Nans should be disregarded.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2018-08-13 - record created by Alberto Alberello. 2022-09-21 - record updated by Dave Connell to publicly release the data.
Metadata
- Metadata identifier
- string/AAS_4434_ACE_HOSM
- Language
- English
- Character encoding
- UTF8
Author
Author
Author
Author
Sponsor
Owner
- Title
- Parent Metadata Record
- Citation identifier
- AAS_4434_ACE_WAMOS
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 281d1f4d-0171-48a5-8b98-f4c0cd83e25d
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2022-09-21T11:15:56
Identifier
- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/AAS_4434_ACE_HOSM
Point of truth for the metadata record
- Date info (Creation)
- 2018-08-13T00:00:00
- Date info (Last Update)
- 2022-09-21
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile
Overviews
Spatial extent
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