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Sensitivity of Temperature and Salinity to River Forcing in CBOFS2 Model

This study evaluates the impact of river volume discharge adjustments on temperature (T) and salinity (S) predictions in the Chesapeake Bay Operational Forecast System (CBOFS2). We compared modified river discharge inputs against original hindcast runs during summer and winter periods. Findings indicate significant T and S differences at various depths, particularly influenced by localized river conditions. The spatial variability reveals trends near the Bay mouth and tributaries, with notable stratification in the upper Bay. Adjustments improve model accuracy, reflecting better conditions for hydrodynamic predictions.

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Sensitivity of Temperature and Salinity to River Forcing in CBOFS2 Model

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  1. CBOFS2 Temperature and Salinity Sensitivity to River Forcing Lyon Lanerolle1,2, Richard Patchen1 and Frank Aikman III1 1National Oceanic and Atmospheric Administration (NOAA) National Ocean Service/Office of Coast Survey/Coast Survey Development Laboratory 1315 East-West Highway, Silver Spring, MD 20910 2Earth Resources Technology (ERT) Inc. 10810 Guilford Road, Suite 105, Annapolis Junction, MD 20701

  2. CBOFS2 Model Grid

  3. CBOFS2 Rivers for Forcing River volume discharge adjustment factors (Wen Long)

  4. CBOFS2 Total River Volume Discharge Events Dry Periods

  5. Summer Time Surface Temperature Temperature (oC) Temp. Difference (oC) Difference = CBOFS2 with new river Q weights – original CBOFS2 hindcast run

  6. Summer Time Bottom Temperature Temperature (oC) Temp. Difference (oC)

  7. Winter Time Surface Temperature Temperature (oC) Temp. Difference (oC)

  8. Winter Time Bottom Temperature Temperature (oC) Temp. Difference (oC)

  9. Summer Time Surface Salinity Salinity (PSU) Salt. Difference (PSU)

  10. Summer Time Bottom Salinity Salinity (PSU) Salt. Difference (PSU)

  11. Winter Time Surface Salinity Salinity (PSU) Salt. Difference (PSU)

  12. Summer Time Bottom Salinity Salinity (PSU) Salt. Difference (PSU)

  13. Summer Time Lower Bay Conditions Difference = CBOFS2 with new river Q weights – original CBOFS2 hindcast run

  14. Summer Time Upper Bay Conditions

  15. Winter Time Lower Bay Conditions

  16. Winter Time Upper Bay Conditions

  17. Summary and Conclusions • CBOFS2 river volume discharges need adjusting to compensate for ground, surface water effects, etc. • Effect of adjustments clearly manifested in the CBOFS2 T and S predictions • Spatial (horizontal) T and S differences at surface and bottom are similar • Differences in T mainly at Bay mouth, shelf and in tributaries and ± 1 oC • Differences in S more clearly seen specially in tributaries and are ± 1.5 PSU • T, S differences in Bay axis appear to get washed out to the Bay mouth & shelf • Spatio-temporal (depth vs. time) T, S differences show that : (i) in lower Bay they are localized near the surface but otherwise distributed throughout the water column, (ii) in upper Bay the differences are more stratified with less variations and (iii) Summer-Winter differences are not dissimilar

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