Christopher L Osburn and Donald P Morris

Table of contents

Abstract 187

6.1 Introduction 187

6.1.1 The importance of photochemistry in the cycling of DOM 187

6.1.2 Definitions and terms 188

6.2 The nature of light and its absorption in natural waters 188

6.2.1 The laws of photochemistry 189

6.2.2 Absorbance of light 191

6.2.3 Description of CDOM absorbance 192

6.3 Direct and indirect photochemical reactions 193

6.3.1 Direct photochemical reactions 193

6.3.2 Indirect photochemical reactions 194

6.4 Characterization of CDOM 195

6.4.1 Physical characterization of CDOM 195

6.4.2 Chemical characterization of CDOM 195

6.5 Photochemical changes in DOM 197

6.5.1 Measurement of organic photoproducts 197

6.5.2 Measurement of inorganic photoproducts 197

6.5.3 Recent approaches to measuring photochemical changes to CDOM 198

6.6 Experimental and modeling considerations for working with

CDOM photochemistry 199

6.6.1 Experimental methods 200

6.6.2 Reporting photobleaching results 201

6.6.3 Modeling photochemical changes in CDOM 202

6.6.4 Use of polychromatic vs. monochromatic radiation 204

6.7 CDOM dynamics in natural waters: Sources, sinks, and transformations 205

6.7.1 Chemical transformations of CDOM by UVR 205

6.7.2 Ecological implications of CDOM photochemistry 207

6.8 Conclusion 208

Acknowledgements 208

References 209

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