COASTAL EUTROPHICATION IN RELATION TO ATMOSPHERIC NITROGEN DEPOSITION - CURRENT PERSPECTIVES

被引:145
作者
PAERL, HW
机构
[1] Institute of Marine Sciences, University of North Carolina, Morehead City, NC 28557, Chapel Hill
来源
OPHELIA | 1995年 / 41卷
关键词
D O I
10.1080/00785236.1995.10422046
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Nitrogen-limited estuaries, shallow coastal and continental shelf waters account for nearly half the global oceanic primary production. Accelerating primary production, or eutrophication, of these waters appears linked to increasing anthropogenic N loading. Among loading sources, atmospheric nitrogen deposition (AND) (as wet- and dryfall) is of considerable and increasing importance (100 to over 1000 mgN . m-2 . yr(-1)). Current contributions of AND to total external N loading range from 10 to over 50%. AND may play a central role in mediating ''new'' production in coastal oceans downwind of emissions. Examples of AND-impacted waters include: US Atlantic coastal waters, where atmospheric N inputs can significantly enhance CO2 fixation and chlorophyll a production, the Baltic and North Seas, the Canadian Atlantic seaboard, and the Western Mediterranean Sea. Recent increases in toxic and non-toxic phytoplankton blooms in these waters may be linked to accellerating nutrient loading at the land-sea interface; a significant fraction of it attributable to AND. This hitherto-neglected nutrient-production interaction requires evaluation on regional and larger synoptic scales. Aircraft and satellite-based ocean color remote sensing (i.e. SeaWiFS) will be useful in characterizing and linking the spatial-temporal interactions of this and other >>new<< nutrient inputs with eutrophication of estuarine and coastal waters.
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页码:237 / 259
页数:23
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