Accession Number : ADA288932

Title :   IES Calibration for Main Thermocline Depth: A Method Using Integrated XBT Temperature Profiles.

Descriptive Note : Summary rept. May 88-Aug 90,

Corporate Author : RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY

Personal Author(s) : Howden, S. D. ; Fields, E. ; Qian, X. ; Tracey, K. ; Watts, D. R.

PDF Url : ADA288932

Report Date : NOV 1993

Pagination or Media Count : 23

Abstract : A new method of calibrating Inverted Echo Sounder (IES) travel time measurements to main thermocline depths is described. Unlike the traditional method in which the thermocline is defined by a point measurement, such as the depth of the 12 deg C isotherm depth as measured with an XBT, this technique utilizes the full temperature profile of XBT casts. The advantage of this method is that the vertical integral of temperature, QT= Tdz is conceptually and empirically very closely correlated with the acoustic travel time measured by the IES, r=2 c-1 dz. Comparisons of the new method with the more traditional point method show that the root-mean-square error in the calibration (11 m standard deviation) is 1/3 as large as before, and outlier values are significantly reduced. The final coefficients used to calibrate the SYNOP Central and Inlet Array IESs are tabulated.

Descriptors :   *OCEANOGRAPHIC DATA, *GULF STREAM, *THERMOCLINES, OCEAN SURFACE, ACOUSTIC WAVES, DEPTH, BATHYMETRY, PROFILES, TEMPERATURE GRADIENTS, CALIBRATION, LINEAR ARRAYS, UNDERWATER ACOUSTICS, ECHO RANGING, TRAVEL TIME, FRONTS(OCEANOGRAPHY), COMPUTER PROGRAMS.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE