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Investigation of the Currents and Density Structure of Lare Erie

By Saylor, James H.

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Book Id: WPLBN0000659685
Format Type: PDF eBook
File Size: 1.45 MB.
Reproduction Date: 2005
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Title: Investigation of the Currents and Density Structure of Lare Erie  
Author: Saylor, James H.
Volume:
Language: English
Subject: Science., Ecology & environment, National Oceanic and Atmospheric Administration (U.S.)
Collections: National Oceanographic Data Center
Historic
Publication Date:
Publisher: Government Reference Publication

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Saylor, J. H. (n.d.). Investigation of the Currents and Density Structure of Lare Erie. Retrieved from http://hawaiilibrary.net/


Excerpt
Excerpt: INVESTIGATION OF THE CURRENTS AND DENSITY STRUCTURE OF LAKE ERIE. Currents and water temperatures were recorded at a large-scale grid of fixed moorings in Lake Erie from May 1979 through June 1980. Thermistor chains were used to record the complete development and decay of central basin stratification. First a fragile stability develops, which is very susceptible to high wind stress. For example, strong wind impulse in late May 1979 completely mixed the central basin and postponed the development of stable stratification for 3 weeks. Currents measured in the lower half of the central basin water column were mostly return flows (beneath the surface wind drift) driven by the surface pressure gradient. We often observed a complex system of Lake Erie circulation gyres as predicted by models, although we noticed a frequent tendency for one of the central basin gyres to become dominant and envelop the whole basin in either uniform clockwise or anticlockwise flow. It is not clear why one of the circulation cells grows as opposed to the others. The currents appear to be somewhat more barotropic than predicted by full Ekman layer current models. Tidal-like currents driven by the longitudinal seiches of Lake Erie control the island-filled passages between the western and central Lake Erie basins, with currents across the whole island chain very much in phase. Processes of hypolimnion volume entrainment are suggested from the central basin temperature recordings. Large quantities of water were exchanged between the central and eastern basins over long periods; this occurred mostly after the shallow ridge that separates them had become unstratified. These and other topics are discussed as we explore the large data set generated from the experiment.

Table of Contents
CONTENTS Abstract 1. INTRODUCTION 2. DESCRIPTION OF MEASUREMENTS 3. RESULTS 4. SUMMARY AND DISCUSSION 5. REFERENCES Appendix A.--LOW-PASS FILTERED WIND STRESS VECTORS FOR THE PERIOD OF THE CURRFNT MEASURING PROGRAM, MAY 1979 THROUGH JUNE 1980. Appendix B.--WATER TEMPERATURE ISOTHERMS (C) DRAWN FROM THERMISTOR CHAIN RECORDINGS AT MOORINGS 9, 11, 19, AND 21 IN THE CENTRAL BASIN OF LARE ERIE FOR MAY THROUGH SEPTEMBER 1979. Appendix C.--VECTOR-AVERAGED LAKE ERIE CURRENTS COMPUTED ON A MONTHLY BASIS FOR MAY 1979 THROUGH JUNE 1980. Page 1 1 4 12 48 51 55 60 66

 

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