Original telegrams of surface weather observations in the Southern Ocean on board the R/V Akademik Tryoshnikov during the Antarctic Circumnavigation Expedition (ACE) in the austral summer of 2016/2017.

***** Dataset abstract *****

This dataset contains original reports of surface weather observations in the Southern Ocean made aboard the R/V Akademik Tryoshnikov during the Antarctic Circumnavigation Expedition (ACE), in the austral summer of 2016/2017. The observations were made by a meteorologist on board the ship and encoded with FM 13–XIV Ext. SHIP code form (Report of surface observation from a sea station). The encoded telegrams were sent to the World Meteorological Organisation (WMO) and archived on the ship. 

The telegrams were usually recorded on a 3-hourly basis (at 0000, 0300, 0600, 0900, 1200, 1500, 1800, 2100 UTC) and on some dates on a 6-hourly basis. They contain information about present and past weather; latitude, longitude, speed and direction of the ship; visibility; type, height and amount of clouds; speed and direction of wind; air, dew-point and sea-surface temperatures; barometric pressure; period, height and direction of waves; concentration of sea ice; information about land ice. Data coverage is from November 2016 until April 2017, with some data missing from February and March.

For more information on this type of report, please see the WMO Manual on Codes (WMO-No.306), Volume I.1, Part A:
https://library.wmo.int/index.php?lvl=notice_display&id=13617#.XoHf4oW3Ih4

Data files have undergone no processing or quality-checking, therefore, if the variable you need is available in another ACE dataset, it is recommended to use the quality-checked data. These telegrams have been decoded and are available in another related dataset.

***** Original data collection *****

This observations recorded in this dataset were recorded as follows: 
Wind speed and direction: anemometer Vaisala Marine Automatic Weather Station (MAWS) 420
Cloud base height: ceilometer Vaisala CL31, Vaisala MAWS420
Pressure, air temperature, dew point temperature: Vaisala MAWS420
Sea surface temperature: infrared thermometer
Ship speed and direction: ship's navigation instrumentation
Waves (height and period): ship's instrumentation
Weather, cloud type, sea ice, land ice: visual observations

The data are visual and instrumental observations at 3-hourly time step (observations done at 0000, 0300, 0600, 0900, 1200, 1500, 1800, 2100 UTC). The observations contain weather information at the time of observations, as well as during the previous 3 hours (the periods between the reporting). 

The meteorologist recorded the observations using the program MeteoNavigator (version v1.0.0, 2006, in Russian), encoding the information using WMO FM 13 SHIP code. The encoded data were reported to WMO (when the ship was located in the Antarctic International Waters) and saved during the expedition. 

Encoded data files were named in the format: UBXH3mmdd.HHh
where UBXH3 is the callsign of the R/V Akademik Tryoshnikov, mm=month, dd=day, HH=hours (in 24-hour clock) and h means hours. The year for this dataset will be 2016 if the month is November (11) or December (12) and 2017 if the month is January (01), February (02), March (03) or April (04).

The WMO FM13 code can be found online: https://library.wmo.int/doc_num.php?explnum_id=5708

***** Data processing *****

The original telegram files have not undergone any processing. 

***** Quality checking *****

No quality checking has been undertaken.

***** Standards *****
 
This dataset does not conform to any data formats or standards.

***** Further information for interpreting the data and using the dataset ***** 

See the related publications for the decoded data. 

***** Dataset contents *****

- UBXH3mmdd.HHh, data file, text file
- README.txt, metadata, text file

***** Dataset contact *****

Irina Gorodetskaya,  CESAM - Centre for Environmental and Marine Studies, Department of Physics, University of Aveiro, Portugal. ORCID: 0000-0002-2294-7823. Email:  irina.gorodetskaya@ua.pt

***** Dataset license *****

This set of original meteorological telegrams are made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full description can be found at https://creativecommons.org/licenses/by/4.0/

***** Dataset citation *****

Please cite this dataset as:
Veledin, V. and Gorodetskaya, I. (2020). Original telegrams of surface weather, ocean and ice state observations in the Southern Ocean on board the R/V Akademik Tryoshnikov during the Antarctic Circumnavigation Expedition (ACE) in the austral summer of 2016/2017. (Version 1.0) [Data set]. Zenodo.