Work summary

Zhibin SunJan/15/2010

Outline

• Part 1: MAB• Part 2: GOM

Part 1: MAB

• Period: 1993 to 1999

Mean V at bottom level

• K=kb-1, kb-2• Monthly• Whole

month #2

Kb-1

Kb-2

month #5

Kb-1

Kb-2

month #8

Kb-1

Kb-2

month #11

Kb-1

Kb-2

whole

Kb-1

Kb-2

Mean SSH and V(k=13)

• K=13 is about sigma=0.5 (mid level)

month #2

SSH

T(k=13)

month #5

SSH

T(k=13)

month #8

SSH

T(k=13)

month #11

SSH

T(k=13)

whole

SSH

T(k=13)

T at -50m and -500m

• interpolation

month #2

T(-50m)

T(-500m)

month #5

T(-50m)

T(-500m)

month #8

T(-50m)

T(-500m)

month #11

T(-50m)

T(-500m)

whole

T(-50m)

T(-500m)

Section Volume transport (U) from shelf to isobaths

• 60m• 100m• 200m

Fine Grid Domain

1993 to 1999

winter

autumn

summer

spring

Volume transport at sections (Savidge)

C

B

A

AN

Part 2: GOM assimilation using Kathy’s SSHa observations

• 6 cases: (1 day assimilation time interval)• Case A: Assimssh• Case B: Assimssh + Kathy’s obs (immediately)• Case C: Assimssh + Kathy’s obs (0.5 day later)• Case D: AssimEnoi• Case E: AssimEnoi + Kathy’s obs (immediately)• Case F: AssimEnoi + Kathy’s obs (0.5 day later)

Domain and obs time coverage

• 2003-4-9 to 2004-3-26

Case BSpatial CC Temporal CC

Compare Satellite and Kathy’s obs

• Exclude data point where spatial CC < 0.7

Case B

Before exclude

After exclude

Case A

Before exclude

After exclude

Case C

Before exclude

After exclude

Case D

Before exclude

After exclude

Case E

Before exclude

After exclude

Case F

Before exclude

After exclude

Part 2 conclusions

• Difference between satellite and Kathy’s observation does affect assimilation significantly.

• Difference lasts longer, results are much worse.

• The region of low temporal CC is related to the difference between satellite and Kathy’s observation.