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Controls on nitrous oxide production and consumption in reservoirs of the Ohio River Basin Jake J Beaulieu†*, Chris T Nietch†, Jade L Young‡ † US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Cincinnati, OH 45268 ‡ US Army Corps of Engineers, Louisville District Water Quality, Louisville, KY 40201 *Corresponding author Contents of this file Text and figures S1 to S23 Introduction SI material includes R code used for non-linear modeling and figures displaying detailed depth profiles for nutrients and temperature in each lake. Non-linear Modeling Code ############################################################## ## CODE FOR APPLYING TWO PARAMETER EXPONENTIAL MODEL TO ## N2O ~ NO2 AND N2O ~ NO2.3 RELATIONSHIPS in the epilimnion ############################################################## # DATA # Mean N2O saturation ratio (N2O.sat), nitrite (NO2), and nitrite + nitrate (NO2.3) # in the epilmnion of stratified reservoirs. Data is provided in SI as a text file # 2015JG002941R-ds01.txt. df <- read.table("2015JG002941R-ds01.txt", header = TRUE) # Change this path per User's directory # TWO PARAMETER EXPONENTIAL # N2O vs nitrite () m.n2o.no2 <- nls(N2O.sat ~ a*(1-exp(-b*NO2)), start = list(a=5, b=0.1), # two parameter exponential model data = df) summary(m.n2o.no2) # p < 0.001, but no r2 reported for nls model. # Calculate r2 by comparing predicted vs observed values cor(df$N2O.sat, # original data predict(m.n2o.no2, # model prediction newdata=df), use="pairwise.complete.obs") # R = 0.91, r2=0.83 # N2O vs nitrate (NO3) m.n2o.no3 <- nls(N2O.sat ~ a*(1-exp(-b*(NO2.3 - NO2))), # Nitrate calculated as difference start = list(a=5, b=0.1), # two parameter exponential model data = df) summary(m.n2o.no3) # p < 0.001, but no r2 reported for nls model. # Calculate r2 by comparing predicted vs observed values cor(df$N2O.sat, # original data predict(m.n2o.no3, # model prediction newdata=df), use="pairwise.complete.obs") # R = 0.87, r2=0.76 Figure S1. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in BHR on 2013-08-12. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S2. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in BRR on 2013-08-06. Figure S3. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in BVR on 2013-08-06. Figure S4. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in C.J. Brown (CBR) on 2013-08-28. Figure S5. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Caesar Creek (CCK) on 2013-09-25. Figure S6. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Carr Creek Lake (CFK) on 2013-08-14. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S7. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in C.H. Harden (CHL) on 2013-09-26. Figure S8. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Cagles Mill (CMR) on 2013-10-08. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S9. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Cave Run Lake (CRR) on 2013-09-05. Figure S10. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in East Fork Lake (EFR) on 2013-07-24. Figure S11. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in East Fork Lake (EFR) on 2013-08-27. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S12. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in East Fork Lake (EFR) on 2013-09-24. Figure S13. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in East Fork Lake (EFR) on 2013-10-29. Figure S14. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Green River Lake (GRR) on 2013-08-05. Figure S15. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in J.E. Roush (HTR) on 2013-09-09. Figure S16. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Monroe Lake (MNR) on 2013-08-20. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S17. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Mississinewa Lake (MSR) on 2013-09-10. Figure S18. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Nolin Lake (NRR) on 2013-08-08. Figure S19. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in PatokaLake (PRR) on 2013-08-22. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S20. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Rough River Lake (RRR) on 2013-09-17. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line Figure S21. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Salamonie (SRR) on 2013-10-02. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S22. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in Taylorsville Lake (TAR) on 2013-09-16. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line. Figure S23. Depth profiles of A) water temperature, B) dissolved oxygen, C) nitrite (NO2-), D) nitrite + nitrate (NO2.3), E) ammonium (NH4+), and F) soluble reactive phosphorus (SRP) measured at the deepest location in West Fork Lake (WFR) on 2013-08-29. The open circles in panel C indicate NO2- values below the analytical detection limit (dl) of 1.8 µg N L-1 which is indicated by the vertical dashed line.