Water column optics and penetration of UVR

Bruce R. Hargreaves

Table of contents

Abstract 61

3.1 Introduction and background 61

3.2 Optical classification of natural waters 68

3.3 Constituents controlling UV attenuation in natural waters: bio-optical models 69

3.3.1 Role of CDOM (Kirk type G waters) 76

3.3.2 Role of phytoplankton and CDOM (Kirk type A and GA natural waters) 86

3.3.3 Ultra-low attenuation (Kirk type W, WA, or WG natural waters) 92

3.3.4 Attenuation and absorption by pure water 93

3.4 Predicting levels of UV-attenuating constituents 94

3.4.1 A conceptual model for UV-DOC relationships 96

3.5 Future directions 97

Acknowledgements 98

References 99

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