Richard G Zepp

Table of contents

Abstract 139

5.1 Introduction 139

5.2 Carbon cycle 141

5.2.1 UV-CDOM interactions and aquatic optical properties 141

5.2.1.1 CDOM sources and characteristics 141

5.2.1.2 CDOM eifects on UV penetration 142

5.2.1.3 Eifects of UV on CDOM optical properties 143

5.2.2 UV interactions with aquatic carbon capture and storage 145

5.2.2.1 Phytoplankton photosynthesis 145

5.2.2.2 Other UV interactions with carbon capture and storage 146

5.2.3 UV effects on decomposition 148

5.2.3.1 Microbial photoinhibition 148

5.2.3.2 Direct photodecomposition 149

5.2.3.3 UV effects on lability of microbial substrates 151

5.2.3.4 Modeling UV-induced decomposition 152

5.2.3.5 UV-induced oxidation in coastal areas 153

5.3 Nitrogen cycle 155

5.3.1 Nitrogen fixation 155

5.3.2 Photoreactions of persistent DON 155

5.3.3 Nitrous oxide, nitric oxide, nitrate and nitrite 156

5.4 Sulfur cycle 157

5.4.1 Dimethyl sulfide 158

5.4.2 Carbonyl sulfide 159

5.5 Metals cycling 161

5.5.1 Iron 161

5.5.2 Copper 163

5.5.3 Manganese 165

5.6 Radiation amplification factors 166

5.7 Summary 167

5.8 Appendix: modeling rates of photoreactions 168

Acknowledgements 171

References 171

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