A coupled model system

for shelf seas and marginal seas

Hans Burchard (IOW) and many others

Motivation

Figure SPM.5

Climate change Eutrophication

Constructions Fishery

IPCC BACC

Baltic Assessment for Climate Change

The Baltic Sea estuarine circulation

Reissmann et al., 2009

Exchange flow

Inflows

Boundary and internal mixing

Air-sea interaction

Hydrography of upper mixed layer in Central Baltic Sea

Data: Volker Fiekas (FWG)

Micro-structure-profiles

Burchard et al. (2006)

Biogeochemistry in the upper Central Baltic Sea

Zooplankton migration in Central Baltic Sea

Coupling waves and currents

GETM

Current velocities at coastal station (Duck‘94)

Cross-shore Along-shore

Moghimi et al. (2013)

Implementation of Marine Strategy Framework Directive

Questions about complex interactions

in a variable coastal environment require an integrative model

concept.

Modular System for Shelves and Coasts (MoSSCo)

atmosphericchemistry

atmosphericphysics

benthic geoecology

benthic biogeochemistry

cohesivesediments adaptive

ecosystem& element

cycles

waves

riverdischarge

oceanphysics

oceanBGC

water physics

Modular System for Shelves and Coasts (MoSSCo)

COAWST Modeling System

C = Coupled MCT http://www-unix.mcs.anl.gov/mct/

O = Ocean ROMS http://www.myroms.org/

A = Atmosphere WRF http://www.wrf-model.org/

W = Wave SWANhttp://vlm089.citg.tudelft.nl/swan

ST = Sediment Transport CSTMShttp://woodshole.er.usgs.gov/project-

pages/sediment-transport/

Modeling System

COAWSTCoupled Ocean – Atmosphere – Wave – Sediment Transport

Modeling System to investigate the impacts of storms on coastal environments.

svn 455

v 2.6.0

v 3.4

v 40.91

Modelsetup

OCEAN

ATMOSPHERE

WAVE

us, vs, h, bath, Z0

Hwave, Lmwave, Lpwave, Dwave,Tpsurf, Tmbott, Qb, Dissbot, Disssurf, Disswcap, Ubot

MCT

Uwind, V

wind, P

atm

, RH, T

air,

cloud

, rain

, eva

p, S

Wra

d, L

wrad

LH, H

FX, Ustr

ess,

Vstres

s

SST

MCT

Uwind , V

wind

Hwave , L

pwave ,

Tpsurf ,

MCT

WRF wind speed

Longitude

Latit

ude

ROMS SST SWAN Hsig

SEDIMENT

SCRIP - grid interpolation

Atmosphere model provides heat flux to cover entire ocean grid. SCRIP interpolations weights needed to remap data fields.

Ocean model provides higher resolution and coupled response of SST to atmosphere. But the ocean grid is limited in spatial coverage so atmosphere model must combine data from different sources, which can create a discontinuity in the forcing.

http://climate.lanl.gov/Software/SCRIP/

Flux conservativeremapping scheme

Ocean grid5 km

Atm Grid6 km

HFLX10 GFS data

SST

Nor’Ida Nov 2009

Bodie Island, NC

Wallops Island, VA

L

L

H

8th Nov

9th Nov

10thNov

11thNov

13thNov

wind speed23 m/s (50 mph)

Before

Before

After

Afterhttp://

coastal.er.usgs.gov/hurricanes/norida/

Wav

e h

eigh

ts (m

)

wind speed40 m/s (90 mph)

WRF

WINDSWRF + ROMS + SWAN m/sWRF + ROMS

S

0.850.780.89

DATAWRF

WRF+ROMSWRF+ROMS+SWAN

Reduced wind speed with waves coupling.

WAVESWRF

WRF + SST +OOST WRF + SST

DATAWRF

WRF+ROMSWRF+ROMS+SWAN

WRF + ROMS + SWANWRF + ROMSWRF

S

0.800.740.88

m

Reduced waves with waves coupling.