South East Queensland Modelling report published as SEQ RWQM V3 Phase II Final Report with Biogeochemical Modelling (Ch 4) update

[摘要] EXECUTIVESUMMARY (partial)The hydrodynamic, sediment transport and biogeochemical components of RWQMv3 havebeen calibrated against observations and considered suitable for use in scenario simulationsonthebasisthattheyrespondcorrectlytoforcingandstatisticallyreplicatetheobservations.A dedicated field program was undertaken during December 2009 to March 2010 whichdeliveredhighresolutiondataatsevensitessuitableforcalibratingthehydrodynamicmodel.Thequalityofthesedatawasvaried,withtemperatureandvelocityprovidinggoodreturn,sealevel exhibiting drift for some sensors, and salinity being unsuitable for calibration purposes.This field program did not sample sediment or biogeochemical variables, and theEcosystemHealthMonitoringProgram(EHMP)datasetwasusedastheprimarydatasetforcalibrationofthesemodelcomponents.Thesedataweresampledcoarselyinspaceandtime(monthly),andwhile this monitoring scheme captures the spatial heterogeneity across Moreton Bay, it doesnot capture the high frequencyorepisodic events.Therefore, themonthlyEHMPsamplingcouldbebiasedbytidalstateandmaymisssignificantrunoffandstormevents.SincethetimeandspacescalesofprocessescapturedbythemodelandEHMPdatadiffer,averagingmustbeappliedtomodeloutputandobserveddatatorenderthemcompatibleforcomparison.Thesecomparisonmetrics may not be universally applicable across the domain for all times, andundersomecircumstancestheirapplicationmaybeinappropriateoruninformative.The hydrodynamic model described in the Phase I report, and modified to include improvedrepresentationoftheintertidalzone,wascalibratedtotheobservationsdeliveredbythefieldprogram. An ensemble optimal interpolation data assimilation method was used to estimatethe spatial distributions of short wave radiation parameters, which were critical to correctlysimulatingthetemperatureresponse.Biasintheopenboundaryforcingandinitialconditionsderived from the global model was removed using the mooring data at the simulation starttime, and horizontal mixing and radiative bulk schemes were optimised to provide the bestdata-­‐observation correlation. The temperature solution produced excellent agreement withobservation, particularly the advective response due to the mean flow. Sea level at tidaltimescales(diurnalandtheneap-­‐springcycle)alsoshowedgoodagreement.Salinitycomparisons with EHMP data were acceptable, although the coarse resolution of thesemeasureddata introduced aliasing with model output which made comparison difficult.

[发布日期] 2014-02-01 [发布机构] CSIRO

[学科分类] 地球科学(综合)