README_CTD.FMT - describes data file formats for the Western Gulf of Maine CTD profiles associated with the UNH CONVEX research program Updated: 03 JUN 98 For questions - please contact Frank Bub OPAL/UNH/Durham, NH 03824 frank.bub@unh.edu - 603-862-3154 These are INTERIM profiles. We have yet to complete the research associated with these data and RESERVE THE RIGHT to initial publication. Please contact us for further information. These data files are RECTANGULAR ASCII matrices which have been written in a form for immediate 'load' and read by MATLAB. Files are in a 'standard' data arrangement as described below. The CTD profile data have been properly calibrated and filtered in accordance with Sea Bird procedures. The salinity corrections, based on Autosal data regressions have been applied when available. Data acquistion/precisions are described in our CONVEX cruise reports accessed via 'http://ekman.sr.unh.edu/OPAL' Filename conventions (in the directories listed below) are: (cruise)'_'(ctd#)'.asc' - all small letters cruise = en (Endeavor) or oc (Oceanus) plus ship's assigned deployment number ctd # = sequential by time from start of survey asc = indicates an ascii file Ex: en291_02.asc, en294_11.asc, en300_01.asc, en306_40.asc Additional files in the directory include (cruise)hdr.txt - collected header lines for the CTD files (cruise)track.txt - lists waypoints, CTD locations and distances between station.s Cruises: 1. en291 - 03 - 05 January 1997 2. en294 - 31 January - 04 February 1997 3. en300 - 18 - 19 May 1997 (only 1 CTD at our mooring) 4. en306 - 01 - 05 October 1998 5. oc315 - 09 - 12 January 1998 6. oc316 - 29 January - 02 February 1998 7. oc323 - 02 - 06 May 1998 Instrument - R/V ENDEAVOR/OCEANUS SeaBird SBE-911+ CTDs with sensors: Pressure (at 1 dbar increments beneath surface of 0) Temperature (deg C) Conductivity (S/m) - Primary (PRI) & secondary (SEC) T-C packages Dissolved oxygen - Current (MA) & temperature (deg C) sensors Light transmission (percent) Chlorophyll-A (G/L via bioluminescence) Irradiance (PAR) Instrument packages vary depending on the cruise. Either 0.0 or -9999.0 in a data column indicates a missing instrument. % STORED DATA FORMAT: % LINE 1 : 14 HEADER COLUMNS... % ( 1) CRUISE - Endeavor (291, 294, 300, 306) / Oceanus (315, 316, 323) % ( 2) STA # - CTD profile in sequence % ( 3) LAT_N - DD.dddd (gives precise to nearest 100th of minute) % ( 4) LON_W - DD.dddd % ( 5) TIME - Z (UCT) % ( 6) DATE - dd % ( 7) MON - mm % ( 8) YEAR - 19yy % ( 9) Z_BTM - Fathometer depth of bottom at cast time % (10) #_PTS - Number of 1 dbar points in the profile % (11) DEEP_PT - deepest pressure point recorded % (12) 00 (filler) % (13) 00 (filler) % (14) 00 (filler) % LINE 2 -> END : 14 DATA COLUMNS... (m = CTD measured, d = derived) % ( 1) PRES (m) - Pressure (dbar), bin averaged at 1 m intervals % ( 2) TEMP (m) - In situ temperature (deg C) % ( 3) SALT (d) - Corrected salinity computed from conductivity % ( 4) SIGT (d) - Potential density anomaly (ref surface) (kg/m^3) % ( 5) DPTH (d) - Depth of point (m) % ( 6) PTEM (d) - Potential temperature (deg C) % ( 7) COND (m) - Conductivity (S/m) % ( 8) XMSN (m) - Percent Light transmission (ref fresh water) % ( 9) FLOR (m) - Fluorescence (Chlorophyll-alfa) % (10) PAR (m) - Photosynthetically available light % (11) DOXY (d) - Computed dissolved oxygem (mL/L) % (12) BVFQ (d) - N^2 Brunt-Vaisaila frequency (1/s^2) % (13) DYNH (d) - Dynamic height, reference surface (m) % (14) SNDV (d) - Sound velocity (m/s) Note that lines 1 & 2 are preceeded by COLUMN IDENTIFIERS. The '%' tells a Matlab program that these are comment lines so they are not read in. EXAMPLE: The first two and the last rows from the file 'oc316_050.asc' are % CRUISE STA# LAT_N LON_W TIMEZ DAY-MON-YEAR Z_BTM #PTS DEEP_PT 316 050 41.9995 69.5047 0606 02 02 1998 210.0 208 207.0 00 00 00 % PRES TEMP SALT SIGT DPTH PTEMP COND XMSN FLOR... 0.0 5.831 32.534 25.6251 0.00 5.831 3.203 91.4 -9.999e+03 (cont) PAR DOXY BVFQ DYNH_0 SNDV (cont) -9.999e+03 17.41 0.01 0.0000 1470.95 ... 207.0 7.466 33.812 26.4213 205.27 7.446 3.471 76.9 -9.999e+03 (cont) -9.999e+03 11.33 0.57 0.4470 1482.36