CBOFS2 Temperature and Salinity Sensitivity to River Forcing

NOAA/NOS/OCS/Coast Survey Development Laboratory

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

CBOFS2 Model Grid

CBOFS2 Rivers for Forcing

River volume discharge adjustment factors (Wen Long)

CBOFS2 Total River Volume Discharge

Events

Dry Periods

Summer Time Surface Temperature Temperature (oC) Temp. Difference

Difference = CBOFS2 with new river Q weights – original CBOFS2 hindcast run

Summer Time Bottom Temperature Temperature (oC) Temp. Difference

Winter Time Surface Temperature Temperature (oC) Temp. Difference

Winter Time Bottom Temperature Temperature (oC) Temp. Difference

Summer Time Surface Salinity Salinity (PSU) Salt. Difference

Summer Time Bottom Salinity Salinity (PSU) Salt. Difference

Winter Time Surface Salinity Salinity (PSU) Salt. Difference

Summer Time Bottom Salinity Salinity (PSU) Salt. Difference

Summer Time Lower Bay Conditions

Difference = CBOFS2 with new river Q weights – original CBOFS2 hindcast run

Summer Time Upper Bay Conditions

Winter Time Lower Bay Conditions

Winter Time Upper Bay Conditions

Summary and ConclusionsCBOFS2 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 similarDifferences in T mainly at Bay mouth, shelf and in tributaries

and ± 1 oCDifferences in S more clearly seen specially in tributaries and

are ± 1.5 PSUT, S differences in Bay axis appear to get washed out to the

Bay mouth & shelfSpatio-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

CBOFS2 Temperature and Salinity Sensitivity to River Forcing

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