NCODA Implementation with re-layerization
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1 NCODA Implementation with re-layerization HeeSook Kang CIMAS/RSMAS/U. Miami with W. Carlisle Thacker NOAA/AOML HYCOM meeting December
2 GULF OF MEXICO MODEL CONFIGURATION: Horizontal grid: 1/12 (258 x 5 grid points, ca. 7 km spacing on average) 18 N to 31 N 20 vertical hybrid layers with the top layer at its minimum thickness of 3m Bathymetry: 5m coastline KPP mixed layer scheme Surface forcing from FNMOC/NOGAPS Monthly river runoff Nested Boundary: relaxation to the 1/12 Atlantic HYCOM T and S, U and V along open boundary, (no assimilation in these experiments) FNMOC: Fleet Numerical Meteorology and Oceanography Center NOGAPS: Navy Operational Global Atmospheric Prediction System 2
3 Building an interface with re-layerization (1) : NOCDA is assimilating observed data into a model with conventional pressure-like vertical coordinates. HYCOM simulation is done with hybrid vertical coordinate, which varies both spatially and temporally. Need to build a coordinate transforming interface between the two systems The strategy is to communicate through existing two HYCOM standard files a) SSH and SST from an archive file b) temperature, salinity, baroclinic velocities and layer thickness from a restart file *T & S change density change layer displacements => layer thickness should be updated with new density information 3
4 Building an interface with re-layerization (2) : 1. Interpolate HYCOM variables onto z-levels to be used as the first guess in NCODA 2. Get observation-based corrections of variables from the NCODA analysis 3. Put the new variables back into HYCOM layers (re-layerization) HYCOM T,S,ρ,U,V,dp interface SSH, SST, T,S,ρ,U,V NCODA 4
5 Experiment of daily updating with NCODA analysis Aug 11, 1999 (the first update cycle) Satellite SST In Situ SST AVHRR GAC GOES AVHRR LAC SHIP BUOY 5
6 Satellite altimetry Aug 11, 1999 Topex ERS2 6
7 Profile Observations Aug XBT PALACE BUOY MODAS DIRECT SYN 7
8 SST Analyzed Increment ( o C) Aug 11, 1999 (after the first update cycle) Aug 20, 1999 (after the 10th update cycle) 8
9 SSH Analyzed Increment (m) Aug 11, 1999 (after the first update cycle) Aug 20, 1999 (after the 10th update cycle) 9
10 after the first update cycle after the 10th update cycle T & S increments T & S increments T T S S 10
11 Checking the changes of layer interfaces Aug 11, 1999 (after the first update cycle) Temperature ( o C) Daily updating Temperature ( o C) No data assimilation Salinity (psu) Salinity (psu) Lines are the layer interfaces 11
12 Aug 20, 1999 (after the 10th update cycle) Daily updating No data assimilation Lines are the layer interfaces 12
13 Sep 10, 1999 (after the 31st update cycle) Daily updating No data assimilation Lines are the layer interfaces 13
14 Weekly updating (restart from Aug 18, 1999) Aug 25, 1999 (after the first update cycle) Sep 18, 1999 (between 4 and 5 update cycles) Lines are the layer interfaces 14
15 Weekly updating (restart from Aug 18, 1999) Oct 27, 1999 (after 10 update cycle) Mar 22, 2000 (after 31 update cycle) Lines are the layer interfaces 15
16 A simple experiment: to see what happens when there are no data that might change the model s state The model running and data corrections were skipped, focusing on transforming back and forth between HYCOM layers and z-levels. Because the dynamics are not changed, ideally nothing should happen. 16
17 Initial condition After 10 times transforming Lines are the layer interfaces
18 Initial condition After 31 times transforming Lines are the layer interfaces 18
19 Transforming back and forth repeatedly is highly diffusive and weakening the stratification at each time. This vertical diffusion introduced by interpolation could be counteracted with the assimilated data if there are enough profiles providing information about the ocean s stratification. However, there are very few such profiles available in the Gulf of Mexico. 19
20 Current & Future works The vertical diffusion caused by interpolation can be avoided if the NCODA analysis is computed in HYCOM s native coordinates. => we come to conclude that it is time to convert the NCODA codes to work directly with HYCOM s layers. Jim provided NCODA codes. Tasks to be done : - compile NCODA codes on a linux machine. - understand NCODA structure. - locate which codes to be modified. - how to handle vertical coordinate. - observed data to be layerized before MVOI. - choose test datasets and test domain. 20
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