Organic Carbon, Nitrogen and Phosphorous Fluxes in Rivers Flowing into and out of Lake Winnipeg - With an analysis of discharges and nutrient fluxes between the North and South Basins. Final Report

Abstract

Objectives The contract requirements are to: 1. Calculate monthly fluxes of total, dissolved and particulate organic carbon (OC) nitrogen (N) and phosphorous (P) via major rivers into and out of Lake Winnipeg, and through the Lake Winnipeg Narrows, for months for which OC, N, and P data are archived in the Canada Department of Fisheries and Oceans (DFO) LWATDAT (i.e. data up to 1993) database or are otherwise made available by DFO. 2. Retrieve nutrient data that has been recorded since 1993 from federal, provincial and City of Winnipeg agencies and add it to the LWATDAT to bring the database up to date. Calculate monthly fluxes as described above, for the post-1993 period of available records. Products 1. Tabulated and plotted monthly C, N and P fluxes into and out of Lake Winnipeg for major rivers and the Narrows for periods for which sufficient chemistry data are available. 2. Annual lake basin budgets of C, N and P such as to identify sources and sinks of these nutrient elements for periods for which sufficient chemistry data are available. 3. Documentation of data sources and methods of flux calculation, with software (Excel spreadsheets or other programs as required, on CD) necessary to extend the monthly C, N, and P flux data set beyond 1999 (i.e. post- LWATDAT database) when appropriate data are assembled.