the example thresholds in Table 2, the models enable decision-makers to evaluate the levels of loads and load reductions necessary to achieve target values they may choose. 2. Loads (MT) needed to achieve example ERI thresholds. For cyanobacteria, the threshold differed among models (see text). March - June Maumee River loads were assumed to be 50% of the annual river load, while March– July Maumee River loads were 53% of the annual load, which was in turn assumed to be 45% of the whole Western Basin annual load. For phytoplankton, Western Basin annual loads refer to a 50% reduction in maximum chlorophyll-a concentration reported by each model. The threshold for Central Basin hypoxic area extent was set to 2000 km2, while a threshold for Central Basin dissolved oxygen was set to 4 mg/L. For Cladophora, we set a threshold total dry weight biomass of less than 30 g/m2. Maumee Maumee WB + CB Whole lake WB annual spring load to annual load to annual load to annual load to Model load to achieve achieve achieve achieve achieve threshold threshold threshold threshold threshold Cyanobacteria Obenour_2008 1230 2460 5467 Obenour_2013 500 1000 2222 Stumpf 1080 2038 4528 1021 1926 4281 Western Basin Phytoplankton Chapra 2600 EcoLE 3010 ELCOM-CAEDYM 1130 WLEEM 2030 Hypoxic Area EcoLE_1-3m 5955 EcoLE_1m 3415 4920 9-Box 1150 Rucinski 4830 Rucinski_WLEEM 3880 Dissolved Oxygen EcoLE_1-3m 4400 EcoLE_1m 2600 ELCOM-CAEDYM 3100 Rucinski 5100 Rucinski_WLEEM 4000
the example thresholds in Table 2, the models enable decision-makers to evaluate the levels of loads and load reductions necessary to achieve target values they may choose. 2. Loads (MT) needed to achieve example ERI thresholds. For cyanobacteria, the threshold differed among models (see text). March - June Maumee River loads were assumed to be 50% of the annual river load, while March– July Maumee River loads were 53% of the annual load, which was in turn assumed to be 45% of the whole Western Basin annual load. For phytoplankton, Western Basin annual loads refer to a 50% reduction in maximum chlorophyll-a concentration reported by each model. The threshold for Central Basin hypoxic area extent was set to 2000 km2, while a threshold for Central Basin dissolved oxygen was set to 4 mg/L. For Cladophora, we set a threshold total dry weight biomass of less than 30 g/m2. Model Maumee spring load to achieve threshold Maumee annual load to achieve threshold WB annual load to achieve threshold WB + CB annual load to achieve threshold Whole lake annual load to achieve threshold Cyanobacteria Obenour_2008 1230 2460 5467 Obenour_2013 500 1000 2222 Stumpf 1080 2038 4528 1021 1926 4281 Western Basin Phytoplankton Chapra 2600 EcoLE 3010 ELCOM-CAEDYM 1130 WLEEM 2030 Hypoxic Area EcoLE_1-3m 5955 EcoLE_1m 3415 4920 9-Box 1150 Rucinski 4830 Rucinski_WLEEM 3880 Dissolved Oxygen EcoLE_1-3m 4400 EcoLE_1m 2600 ELCOM-CAEDYM 3100 Rucinski 5100 Rucinski_WLEEM 4000
Annex-4-Text-11-22-14.docx