Accession Number : ADA530080
Title : Investigation into the Distribution of Ballast Water Tracers in Coastal Waters
Descriptive Note : Final rept.
Corporate Author : COAST GUARD NEW LONDON CT RESEARCH AND DEVELOPMENT CENTER
Personal Author(s) : Murphy, K ; Boehme, J ; Sparks, D ; Smith, G ; Mullady, T ; Novle, M ; Brown, C ; Ruiz, G
Report Date : Nov 2009
Pagination or Media Count : 72
Abstract : The assessment of compliance by ships with mandatory ballast water exchange (BWE) is limited by the difficulty of verifying whether BWE was implemented. Previous research indicates that concentrations in ballast water of barium, phosphorous and manganese and chromophoric dissolved organic matter (CDOM) can be robust tracers of BWE. The current study examined the seasonal and spatial variability of BWE tracers in Pacific rim ports and the adjacent seas, using the north Pacific as a model system to examine whether it would be possible to set universal thresholds for tracer concentrations in ballast water that can consistently and effectively discriminate tanks that have undergone BWE from tanks that have not. Surveys were conducted in eight port systems in North America and Asia and along perpendicular and coastwise transects off the US Pacific coast. CDOM decreased rapidly with increasing distance from land, whereas barium, phosphorous, and manganese exhibited more seasonally and regionally variable trends. CDOM tracers could usually discriminate between port (0.2 nautical miles (nmi) from land) and oceanic samples, but not necessarily between BWE performed in coastal (0.2nmi to 100 nmi from land) versus oceanic (100nmi from land) locations. This result has important implications for verifying BWE performed according to state legislation, which allows BWE as close as 50 nautical miles from land.
Descriptors : *BALLAST TANKS , *LABELED SUBSTANCES , *WATER , ORGANIC MATERIALS , TANKS(COMBAT VEHICLES) , NORTH PACIFIC OCEAN , DISCRIMINATE ANALYSIS , MANGANESE , SEASONAL VARIATIONS , DISTRIBUTION , COASTAL REGIONS , BARIUM
Subject Categories : Surface Transportation and Equipment
Water Pollution and Control
Distribution Statement : APPROVED FOR PUBLIC RELEASE