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京都大学0048新制・課程博士博士(農学)甲第11623号農博第1479号新制||農||906(附属図書館)学位論文||H17||N4016(農学部図書室)23266UT51-2005-D372京都大学大学院農学研究科森林科学専攻(主査)教授 竹内 典之, 教授 小﨑 隆, 助教授 杉山 雅人学位規則第4条第1項該当Doctor of Agricultural ScienceKyoto UniversityDA

Global distribution of atmospheric phosphorus sources, concentrations and deposition rates, and anthropogenic impacts

A worldwide compilation of atmospheric total phosphorus (TP) and phosphate (PO4) concentration and deposition flux observations are combined with transport model simulations to derive the global distribution of concentrations and deposition fluxes of TP and PO4. Our results suggest that mineral aerosols are the dominant source of TP on a global scale (82%), with primary biogenic particles (12%) and combustion sources (5%) important in nondusty regions. Globally averaged anthropogenic inputs are estimated to be ~5 and 15% for TP and PO4, respectively, and may contribute as much as 50% to the deposition over the oligotrophic ocean where productivity may be phosphorus-limited. There is a net loss of TP from many (but not all) land ecosystems and a net gain of TP by the oceans (560 Gg P a-1). More measurements of atmospheric TP and PO4 will assist in reducing uncertainties in our understanding of the role that atmospheric phosphorus may play in global biogeochemistry