Photo by Cameron W. Wobus

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Presentation transcript:

Photo by Cameron W. Wobus Predicting watershed DOC and DON concentrations using concentration-slope relationships Emily Bristol

Kaktovik and Lago Lagoons Beaufort Sea Lagoons Kaktovik and Lago Lagoons Simpson Lagoon Elson Lagoon 1. Delineate catchments for all streams entering each lagoon. 2. Use catchment slope data to estimate dissolved organic carbon and dissolved organic nitrogen concentrations.

Why? Dissolved organic matter is a critical component in these lagoon ecosystems. Freshwater inputs influence marine ecosystem productivity. Beaufort Sea Lagoons Long Term Ecological Research

GIS Data Sources High resolution DEM (2m) available through ArcticDEM, Polar Geospatial Center at the University of Minnesota Limited NHD data Aerial imagery

Methods Determined minimum flow accumulation for streams using aerial imagery Selected stream networks that drained into lagoons of interest Created drainage basin from sub-basins that intersected with selected streams

Catchments draining into LTER lagoons Kaktovik and Lago Lagoons Elson Lagoon Simpson Lagoon

Slope-concentration models Catchment slope explains more than half the variation in spring and summer DOC and DON concentrations in Arctic rivers. Connolly et al. In Review.

Results With increasing catchment slope, [DOC] and [DON] decrease. Lagoon Contributing drainage area (sq km) Catchment slope (degrees) Catchment slope (%) Estimated spring [DOC] Estimated spring [DON] Estimated summer [DOC] Estimated summer [DON] Elson 427.6 0.38 0.11 23.0 0.62 18.5 0.77 Simpson 70809.7 4.45 1.23 14.2 0.40 11.4 0.47 Kaktovik 282.2 0.66 0.18 21.1 0.57 16.9 0.70 Lago 2339.9 11.31 3.14 10.8 0.32 8.7 0.36 With increasing catchment slope, [DOC] and [DON] decrease. For larger catchments, slope increases west to east. Small coastal catchments have the highest [DOC] and [DON], but likely the lowest discharge.

Limitations and Next Steps Difficult to determine all freshwater inputs to lagoons; large, adjacent rivers indirectly contribute carbon and nutrients Discharge models needed to estimate fluxes of DOC and DON Analysis of lagoon-ocean connectivity needed to understand how nutrients are retained in lagoons

Questions?