(1) FILE NAME: 97MMODS1.ALa DATA FILE NAME: 97MMODS1.ALb (2) YEAR and MONTH: 1997, December (3) PI: Mary Ann Moran (4) OTHERS: Wade Sheldon, Joe Covert (5) BRIEF DESCRIPTION OF DATA FILE: ODIS (surface mapper) file that measured various environmental parameters every 15 seconds in the Altamaha River during an LMER5 low tide survey. (6) KEYWORDS: Ogeechee, ODIS, physical, salinity, temperature, density, depth, wind (7) RESEARCH LOCATION: Altamaha River from -2.4km to 12.7km. (8) EXPERIMENTAL DESIGNS and METHODS: The Oceanographic Data Interface System (ODIS) was designed to interface with an assortment of instruments that are on a research vessel (see Travis McKissack at the Skidaway Institute of Oceanography for technical details). The intake for this system is located approximately 1.5M below the water's surface. ODIS is currently connected to a Global Positioning System (GPS), a fathometer, a SeaBird Electronics thermosalinograph (SBE21), multiple Turner fluorometers, and an external temperature sensor. (9) NOTES and COMMENTS: Missing values appear as NaN (not a number). (10) VARIABLE DESCRIPTION: Variable Variable Description Precision/Units Coded -------- -------------------- --------------- ----- DATE date mm-dd-yyyy N TIME 24 hr GMT hh:mm:ss N LAT_DEG latitude deg N N LAT_MIN latitude min N N LONG_DEG longitude deg W N LONG_MIN longitude min W N RIVER river/waterway name 2 chars N STATION distance upriver 0.001 km N GRNDTRK ground track direction (true) deg N GRNDSPD ground speed (true) 0.1 km/h N WINDDIR wind direction (true) deg N WINDSPD wind speed (true) 0.1 m/s N DEPTH depth 0.1 m N CONDUCT conductivity 0.0001 S/m N SIGMA_T specific gravity anomaly (sigma-t) 0.001 kg/m^3 N TEMP_21 SBE-21 temperature (inside cabin) 0.001 deg C N TEMP_3 SBE-3 temperature (external) 0.001 deg C N SALINITY salinity 0.001 PSU N (11) CALCULATIONS: RIVER and STATION are output parameters from LMERmapthe GARLMER Project mapping and river distance calculation program for Matlab. Note: Station distances are calculated relative to the line of demarcation, and are synchronized to nominal 2km CTD station positions. Distance values designated NaN (not a number) indicate locations greater than 3km from the main channel of any GARLMER study river (i.e. defined as outside the confines of the river) SALINITY=PSS-78 SIGMA_T=p(s,t,O)-1000 Note: Both salinity and sigma-t are computed by the SeaBird software program. The formulas used wre obtained from "Algorithms for Computation of Fundamental Properties of Seawater" by N.P. Fofonoff and R.C. Millard, Jr.; Unesco technical papers in marine science #44, 1983. The station location was interpolated between known stations 2 km apart. GRNDTRK and GRNDSPD are corrected for instrument orientation WINDDIR and WINDSPD are corrected for instrument alignment and boat movement (12) FOR MORE INFORMATION CONTACT: Wade Sheldon Dept. of Marine Sciences University of Georgia Athens, GA 30602-3636 wade@wiegert.marsci.uga.edu Travis McKissack Skidaway Inst. of Oceanography travis@skio.peachnet.edu (13) OTHER DATA FILES TO REFERENCE: 97MMFLL1.ALb (14) REFERENCE CITATIONS: None (15) FORMATION OF VARIABLES: FILENAME: 97MMODS1.ALb Column # Column Name Type Width Decimals -------- ----------- ------- ----- -------- 1 DATE date 10 2 TIME time 8 3 LAT_DEG numeric 2 0 4 LAT_MIN numeric 5 2 5 LONG_DEG numeric 2 0 6 LONG_MIN numeric 5 2 7 RIVER text 2 8 STATION numeric 7 3 9 GRNDTRK numeric 3 0 10 GRNDSPD numeric 4 1 11 WINDDIR numeric 3 0 12 WINDSPD numeric 4 1 13 DEPTH numeric 4 1 14 CONDUCT numeric 6 4 15 SIGMA_T numeric 6 3 16 TEMP_21 numeric 6 3 17 TEMP_3 numeric 6 3 18 SALINITY numeric 6 3 (16) NUMBER OF RECORDS: 648 (17) STATUS: 1 (18) FOR ARCHIVAL USE: Data File Validated By: Wade Sheldon Date: June 1998 Date Received By Data Management: 23 June 1998 Date Entered To Database: 5 August 1998 Log Of Changes And Comments: 1. August 1998 - minor editorial changes - tdb