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Initialization Fields and Model Forcings for CBOFS2

Initialization Fields and Model Forcings for CBOFS2 . Lyon Lanerolle 1,2 , Richard Patchen 1 and Frank Aikman III 1 1 National Oceanic and Atmospheric Administration (NOAA) National Ocean Service/Office of Coast Survey/Coast Survey Development Laboratory

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Initialization Fields and Model Forcings for CBOFS2

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  1. Initialization Fields and Model Forcings for CBOFS2 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 Wind Speed Time-SeriesCriteria for Choosing Hindcast Period Hurricane Isabel

  4. CBOFS2 Total River Volume DischargeCriteria for Choosing Hindcast Period Events/Wet Periods Dry Periods Synoptic Hindcast simulation period : June 01, 2003 – August 31, 2005

  5. Initialization Fields • Model spun-up from rest : water elevations, currents zero and T, S non-zero • For latitude ≤ 39.2o N, for T, S fields used WOA2001 climatology for the Bay axis region and for tributaries used CBP observations (blended via bi-linear interp.) • For latitude ≥ 39.2o N, for T, S fields used only CBP observations (CBP data more abundant and better) • Interpolated the T, S in the vertical linearly • Initialization date : June 01, 2003 (0000 hrs GMT)

  6. CBOFS2 River Forcing - I River volume discharge adjustment factors (Wen Long)

  7. CBOFS2 River Forcing - II River volume discharges from USGS River forcing at daily frequency Discharges ramped-up in time over 5-day period (linearly) Discharges distributed vertically according to parabolic profile When rivers distributed over multiple cells, discharge scaled by cross- sectional area Some tributaries combined (e.g. Susquehanna, Choptank, Patuxent, etc.) Rivers non-tidal River T and S from CBP data for 2003- 2005

  8. CBOFS2 Meteorological Forcing NARR blended (via interpolation) observations for winds, air T, air P and RH (via DP) Forcing fields are hourly Avoid using NARR values on land for winds, air T, RH and down. SW Delete NARR grid nodes near obs. to facilitate more effective blending Winds at 10m, air T, RH at 2m and LW down, net SW, air P at surface Use 80% of NARR SW after compar- ing with observations Ramp-up winds over 5-days (linearly) ROMS internally interpolates met. fields via bi-cubic interpolation

  9. CBOFS2 Open Boundary Forcing • Open boundaries selected to be pinned at Duck, NC and Ocean City, MD because of observations • For water elevations on shelf boundary use ADCIRC harmonics for tides with non-tidal contribution from two corners (interpolated) • ADCIRC harmonics adjusted at two corners to match observations exactly using ℮-5x scaling function along CBOFS2 open boundary • For C & D canal water elevations, use Reedy Point total elevations • On shelf boundary use ROMS reduced OB conditions so no need for currents; at C & D OB, use currents from tidal prediction with NOS Stn. 154 (1984 survey) harmonics • For T, S on shelf boundary use WOA 2001 climatology • For T, S at C & D canal boundary use values from USGS station 0142800 which is within DE Bay • T, S forcing is daily and water elevation and currents is 6-minutely (NOS standard) • Forcing again ramped-up over 5-day period (linearly)

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