Initialization fields and model forcings for cbofs2
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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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Initialization fields and model forcings for cbofs2

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


Cbofs2 model grid

CBOFS2 Model Grid


Cbofs2 wind speed time series criteria for choosing hindcast period

CBOFS2 Wind Speed Time-SeriesCriteria for Choosing Hindcast Period

Hurricane Isabel


Cbofs2 total river volume discharge criteria for choosing hindcast period

CBOFS2 Total River Volume DischargeCriteria for Choosing Hindcast Period

Events/Wet Periods

Dry Periods

Synoptic Hindcast simulation period : June 01, 2003 – August 31, 2005


Initialization fields

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)


Cbofs2 river forcing i

CBOFS2 River Forcing - I

River volume discharge adjustment factors (Wen Long)


Cbofs2 river forcing ii

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


Cbofs2 meteorological forcing

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


Cbofs2 open boundary forcing

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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