IES Calibration for Main Thermocline Depth: A Method Using Integrated XBT Temperature Profiles.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1993
- Accession Number
- ADA288932
Entities
People
- Dennis Randolph Watts
- E. Fields
- K. Tracey
- Qian Xiao
- S. D. Howden
Organizations
- University of Rhode Island