An earlier version of this dataset was referenced by a different DOI 10.26179/5e9cfad992fd6
if you need to access the earlier version of the dataset, please contact the Australian Antarctic Data Centre .

All scientific data collected by the Australian Antarctic program (AAp) are eventually described in the Catalogue of Australian Antarctic and Subantarctic Metadata (CAASM). CAASM can be used to search through AAp data descriptions, and it also provides links to access publicly available datasets, which can either be immediately downloaded or obtained from the Australian Antarctic Data Centre (AADC).

Citation
Alberello, A., Bennetts, L., Toffoli, A. and Derkani, M.H. (2020) Antarctic Circumnavigation Expedition 2016-2017: WAMOS data, Ver. 3, Australian Antarctic Data Centre - doi:10.26179/5ed0a30aaf764, Accessed: 2020-07-15
Title
Antarctic Circumnavigation Expedition 2016-2017: WAMOS data
Data Centre
Australian Antarctic Data Centre, Australia
DOI
doi:10.26179/5ed0a30aaf764
Created Date
2017-11-09
Revision Date
2020-05-26
Expected Date of Data Release
2020-05-26
Data Version
3
Parent record
None
Child record
AAS_4434_ACE_HOSM
AAS_4434_ACE_WAMOS_timeseries
AAS_4434_ACE_Wave_Spectra_CalVal

Description

WAMOS (marine radar) data collected during the Antarctic Circumnavigation Expedition (ACE, https://spi-ace-expedition.ch/), from December 2016 to March 2017.

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.

By installing a Wave and Surface Current Monitoring System (WaMoS II, a marine X-Band radar) on the research vessel Akademic Thresnikov and using the meteo-station and GPS on-board, this project has produced a large database of winds, waves and surface currents. Dara were collected during the Antarctic Circmumnavigaion Expedition, which took place from Dec. 2016 to Mar. 2017. The instrumentation operated in any weather and visibility conditions, and at night, monitoring the ocean continuously over the entire Circumnavigation.

Records can support

1. the assessment of metocean conditions in the Southern Oceans; and

2. calibration and validation of wave and global circulation models.

Data - AAS_4434_ACE_WAMOS contains sea state conditions monitored continuously with a Wave and Surface Current Monitoring System (WaMoS II), a wave devise based on the marine X-Band radar (see Hessner, K. G., Nieto-Borge, J. C., and Bell, P. S., 2007, Nautical Radar Measurements in Europe: Applications of WaMoS II as a Sensor for Sea State, Current and Bathymetry. In V. Barale, and M. Gade, Sensing of the European Seas, pp. 435-446, Springer). Sea state consists of the directional wave energy spectrum, angular frequency and direction of propagation. Basic parameters such as the significant wave height (a representative measure of the average wave height), the dominant period, wavelength, mean wave direction, etc… were inferred from the wave spectrum. Surface current speed and the concurrent direction were also detected. Post processed data are available anytime the X-Band radar was operated in a range of 1.5NM; a full spectrum was generally obtained evert 20 minutes.

Data are subdivided in:
- WaMoS II frequency spectrum (1-D spectra)
- WaMoS II wave number spectrum (2-D spectra)
- WaMoS II frequency direction spectrum (2-D spectra)

Data are quality controlled.

**************************************************************************************************************
File informations

Path to the spectra: \RESULTS\YYYY\MM\DD\HH\ : Year, month, day, hour.
space\ : spatial mean results.
single\ : raw spectra.
mean\ : time averaged files.

Header of the spectra:
Additional information that might be needed for data analysis is stored in the headers.
The output results generated using different WaMoS II software modules are separated by comment lines starting with ‘CC’. All headers are subdivided into:
1) Polar Header: including data acquisition parameters.
2) Car Header: including Cartesian transformation parameters.
3) Wave-Current Analysis Header: including wave and current analysis related parameters.
There is a keyword of maximum 5 characters in each line of the header followed by some values and a comment, after the comment marker ‘CC’, describing the keyword.
Values of missing parameters are set to -9, -9.0, -99.0, etc. depending on the data type.
The 'end of header' keyword 'EOH', indicated the last line of the header section.

*******************************************************************
WaMoS II frequency spectrum (1-D spectra):

File Name:
YYYY : Year.
MM : Month.
DD : Day.
HH : Hour.
MM : Minute.
SS : Second.
rigID : WaMoS II platform’s ID code (3 letters)

Suffix:
’*.D1S’ : spatial mean of the spectra (that pass the WaMoS II internal quality control) averaged over WaMoS II analysis areas (up to 9) placed within the radar field of view.
‘*.D1M’ : temporal average spectra calculated using all spectra collected during the past dt=30 minutes of the time specified in the file.

Time reference: CPU clock.

Data Content:
Frequency (f - Hz).
Spectral energy (S(f) - m*m/Hz).
Mean Wave Direction (MDIR(f) - deg), ‘coming from’.
Directional Spreading (SPR(f) - deg/Hz).

*******************************************************************
WaMoS II wave number spectrum (2-D spectra):

File Name:
YYYY : Year.
MM : Month.
DD : Day.
HH : Hour.
MM : Minute.
SS : Second.
rigID : WaMoS II platform’s ID code (3 letters)

Suffix:
’*.D2S’ : spatial mean of the spectra (that pass the WaMoS II internal quality control) averaged over WaMoS II analysis areas (up to 9) placed within the radar field of view.
‘*.D2M’ : temporal average spectra calculated using all spectra collected during the past dt=30 minutes of the time specified in the file.

Time reference: CPU clock.

Data Content:
Spectral energy (S(kx,ky) - m*m/(Hz*rad)) as a function of wave number (kx and ky - rad/m).

Data related header information
MATRIX: Size of Matrix.
DKX: Spectral resolution in Kx direction (2*Pi/m).
DKY: Spectral resolution in Ky direction (2*Pi/m).

*******************************************************************
WaMoS II frequency direction spectrum (2-D spectra):

File Name:
YYYY : Year.
MM : Month.
DD : Day.
HH : Hour.
MM : Minute.
SS : Second.
rigID : WaMoS II platform’s ID code (3 letters)

Suffix:
‘*.FTH’ : spatial mean of the spectra (that pass the WaMoS II internal quality control) averaged over WaMoS II analysis areas (up to 9) placed within the radar field of view.
’*.FTM’ : temporal average spectra calculated using all spectra collected during the past dt=30 minutes of the time specified in the file.

Time reference: CPU clock.

Data Content:
Spectral energy (S(f,θ) - m*m/(Hz*rad)) as a function of frequency (f – Hz) and direction (θ - deg).

Data information
Mf : number of frequency sampling points.
Mth : number of direction sampling points.
Data Matrix: Row 1 frequency sampling points, Column 1 direction sampling points.

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Purpose

Primarily for analysis of ocean surface wave spectra.

Quality

Data are quality controlled. Some entries are empty meaning no data were recorded. Values of missing parameters are set to -9, -9.0, -99.0, etc. depending on the data type.

An older version of this dataset was referenced by the doi: 10.4225/15/5a17923429cb7

Access

These data are publicly available for download from the provided URL.

Temporal Coverages

Spatial Coverages

Science Keywords

Additional Keywords

  • GPS
  • SHIP MOTION
  • WAMOS

Locations

  • GEOGRAPHIC REGION > POLAR
  • OCEAN > SOUTHERN OCEAN
  • CONTINENT > ANTARCTICA

Platforms

  • SHIPS
  • R/V AKADEMIK TRESHNIKOV

Instruments

  • Global Positioning System

Researchers

  • alberello, alberto (INVESTIGATOR,TECHNICAL CONTACT,DIF AUTHOR)
  • bennetts, luke (INVESTIGATOR)
  • toffoli, alessandro (INVESTIGATOR)
  • hajiarab derkani, marzieh (INVESTIGATOR,TECHNICAL CONTACT,DIF AUTHOR)

Use 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_WAMOS when using these data.

Project

    ISO Topic

    • OCEANS

    Dataset Language

    • English

    Orignating Centre

    • Australian Antarctic Division

    Dataset Progress

    • COMPLETE

    IDN Node

    • AMD
    • CEOS
    • AMD/AU

    Publications

    Metadata Revision History

      2017-11-10 - record created by Luke Bennetts. 2018-02-19 - record updated by Dave Connell - basic updates. 2020-03-31 - record updated by Dave Connell to publicly release the data. 2020-04-16 - record updated by Alberto Alberello. 2020-04-21 - record updated by Dave Connell to alter the citation. 2020-05-26 - record updated by Dave Connell after version 3 of the data were supplied.

    Creative Commons License