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  The Ocean Environment 2 CHAPTER CONTENTS
2.1 Physical oceanography ...................................................................................................................22
2.1.1 Distribution of water on earth ...................................................................................... 22
2.1.2 Coastal zone classifications and bottom types ............................................................... 22
2.2 Chemical oceanography ..................................................................................................................24
2.2.1 Salinity....................................................................................................................24
2.2.1.1 Saltwater.............................................................................................................24
2.2.1.2 Freshwater..........................................................................................................27
2.2.2 Pressure..................................................................................................................28
2.2.3 Compressibility........................................................................................................28
2.2.4 Conductivity.............................................................................................................28
2.2.5 Watertemperature....................................................................................................30
2.2.6 Density....................................................................................................................30
2.2.7 Depth......................................................................................................................32
2.2.7.1 Echo sounder.......................................................................................................32
2.2.7.2 Opticacoustic seabed classification .................................................................... 34
2.2.8 Sonic velocity and sound channels ............................................................................. 35
2.2.9 Viscosity..................................................................................................................38
2.2.10 Water flow ............................................................................................................... 38
2.2.11 Turbidity..................................................................................................................38
2.2.12 Chlorophyll..............................................................................................................38
2.2.13 Waterquality............................................................................................................38
2.2.13.1 AlkalinityandpH................................................................................................38 2.2.13.2 Oxidationreductionpotential...............................................................................40 2.2.13.3 Rhodamine........................................................................................................40 2.2.13.4 Specificconductance.........................................................................................40 2.2.13.5 Totaldissolvedsolids..........................................................................................40
2.2.14 Dissolvedgases........................................................................................................40
2.2.15 Ionic concentration ................................................................................................... 43
2.2.16 Solar radiation ......................................................................................................... 43
2.2.17 Light and other electromagnetic transmissions through water ....................................... 43
 The ROV Manual.
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2.2.17.1 Absorption..........................................................................................................43
© 2014 Robert D Christ and Robert L Wernli. Published by Elsevier Ltd. All rights reserved.
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