MERTZ POLYNYA MOORING DATA -------------------------- All these data remain the property of the ACE CRC (Antarctic Climate and Ecosystems Cooperative Research Centre). The ACE CRC aims to deliver knowledge and information needed by our diverse research users. To assess our effectiveness, we need to keep track of data use by you and others. Thus, if you receive this data set, please send an email to: mark.rosenberg@utas.edu.au with the following information: 1. your name and institution 2. what you plan to use the data for (a brief sentence is sufficient) examples: analysing mixed layer nutrient levels for a PhD thesis preparing a Southern Ocean climatology for general research looking at ocean circulation for a conference presentation The data originators (ACE CRC, Australia) should be acknowledged in any publication, including internal reports, published reports, journal articles, presentations etc. For this data set please use the reference: Rosenberg, M., Bindoff, N., Bray, S., Curran, C., Helmond, I., Miller, K., McLaughlan, D. and Richman, J. (2001) Mertz Polynya Experiment, marine science cruises AU9807, AU9801, AU9905, AU9901 and TA0051 - oceanographic field measurements and analysis. Antarctic Cooperative Research Centre, Research Report No. 25, June 2001, Hobart, Australia, 89 pp. Please include this README file if you pass the data on to anyone else. Thanks very much for your help. regards, Mark Rosenberg mark.rosenberg@utas.edu.au ------------------------------------ These files contain mooring data from the Mertz Polynya Experiment deployments. The data report (bigpol.doc) contains a full description of moorings and data processing information. Important data quality information is included in the report. Please delete any previous versions you have of the data, and replace with these final versions. ASCII FORMAT ------------ For all ascii format data files, note the following: * -999 is a null value * recording interval is not regular, as times have been linearly "stretched" or "compressed" over the year to account for clock error * there's a line of data for each ~x minute record, where x is the recording interval (i.e. no time gaps) 1. Microcat and SBE39 files: the files cat*.dat contain a 13 line header, followed by column formatted data as follows, for the SeaBird SBE37 microcats: column parameter 1 decimal time, from midnight on December 31st 1997, where, for example, midday on 1st Jan 1998 = decimal time 0.5 (UTC) 2 temperature (degrees C, ITS90) 3 conductivity (mS/cm) 4 salinity (PSS78) 5 day (all times UTC) 6 month 7 year 8 hour 9 minute 10 second the files sbe*.dat contain a 13 line header, followed by column formatted data as follows, for the SeaBird SBE39 temperature recorders: column parameter 1 decimal time, from midnight on December 31st 1997, where, for example, midday on 1st Jan 1998 = decimal time 0.5 (UTC) 2 temperature (degrees C, ITS90) 3 day (all times UTC) 4 month 5 year 6 hour 7 minute 8 second 2. OEI 9311 temperature logger data the files t*.dat contain a 13 line header, followed by column formatted data as follows, for the OEI 9311 temperature loggers: column parameter 1 decimal time, from midnight on December 31st 1997, where, for example, midday on 1st Jan 1998 = decimal time 0.5 (UTC) 2 temperature (degrees C, ITS90) 3 pressure (dbar) 4 day (all times UTC) 5 month 6 year 7 hour 8 minute 9 second 3. Aanderaa RCM8 current meter data the files rcm*.dat contain a 14 line header, followed by column formatted data as follows, for Aanderaa RCM8 rotor-type current meters: column parameter 1 decimal time, from midnight on December 31st 1997, where, for example, midday on 1st Jan 1998 = decimal time 0.5 (UTC) 2 year (all times UTC) 3 month 4 day 5 hour 6 minute 7 current speed (cm/sec) 8 current direction (degrees true) 9 u=E/W current component (cm/sec), where +ve is east 10 v=N/S current component (cm/sec), where +ve is north 11 pressure (dbar) 12 temperature (degrees C) * for aanderaas in general, temperature and pressure data should only be used qualitatively. For accurate T and S data refer to microcats and sbe39's MATLAB FORMAT ------------- * for all matlab data, null values are represented by NaN * as above, there are no time gaps 1. Microcat, SBE39, 9311 and RCM8 data The data are in matlab files mooringx.mat, where x=mooring number. For the matlab vectors, cat=SBE37 microcat rcm=Aanderaa rotor-type current meter sbe=SBE39 temperature recorder t=OEI 9311 temperature logger For the various instruments: cond = conductivity (mS/cm) dectime = decimal time from midnight on December 31st 1997. So, e.g. midday on January 1st 1998=0.5 decimal time (UTC) dir = current direction (degrees true), towards which current is flowing p = instrument deployment pressure (dbar) press = instrument pressure data (dbar) sal = salinity (PSS78) spd = current speed (cm/s) temp = temperature (deg.C, ITS90) u = E/W current component (cm/s, +ve towards the east) v = N/S current component (cm/s, +ve towards the north) lat and lon = latitude and longitude (degrees) for each mooring 2. moored ADCP data Moored ADCP data from RDI 150 kHz ADCP's are contained in the matlab files d0135new.mat (at mooring 2) and d1143new.mat (at mooring 5). For ADCP's, note: * row 1 to 48 in the matlab matrices correspond to vertical bins 48 to 1 (i.e. where vertical bin 1 is the deepest bin for the upward looking ADCP) * all currents are in earth co-ordinates (i.e. absolute current values) * the matlab definitions for other instruments apply, with the additional matrix/vector definitions: ampy (for y=1-4) = echo amplitude (counts) of beams 1 to 4 bindep = depth (m) to centre of each vertical bin ensemble = ensemble number errv = RMS error velocity (cm/s) pcntgd4 = average % of good 4 beam solutions used in making the bin pitch = pitch (degrees) of instrument roll = roll (degrees) of instrument w = vertical velocity (cm/s, +ve upwards) heading = instrument heading (degrees true) - not to be confused with current direction