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GODAE Inter-comparisons
in the south eastern Indian Ocean Gary B. Brassington, Peter R. Oke, James Cummings, Fabrice
Hernandez and Matthew Martin Introduction
● Quantitative Assessment ● Qualitative
Assessment The goals of this study are to: -
to
understand when, where and why different systems perform well, or poorly, so
that all systems can be improved in terms of their modelling and data
assimilation techniques. -
determine whether some ocean
processes are consistently well/poorly reproduced by all systems and to
understand why. Data Comparisons are made
between model products provided under the GODAE Inter-comparison activity.
The important elements of the four operational ocean forecast systems considered
here are summarised in Table 1. Of these systems, Bluelink
and HYCOM are eddy-resolving, and FOAM and Mercator are eddy permitting. Bluelink, FOAM and Mercator all use z-level models, while
HYCOM is characterised by a hybrid, adaptive vertical grid. Both FOAM and
Mercator use the same model code and grid. All systems use different NWP flux
products. The NWP fluxes for Bluelink, FOAM and
HYCOM represent diurnal variability, while Mercator uses daily averaged
fluxes. Table 1: Model
characteristics.
All systems, except Bluelink, produce daily forecasts of at least 5-days.
Each system uses a hindcast period to spin the
model up prior to a forecast. FOAM uses a short hindcast
period of 1-day, while all other systems use a hindcast
period of at least 5-days. Comparisons presented
here are based on: Bluelink ReANalysis
– delayed mode quality controlled along-track altimeter data; NRT
AMSR-E data, NRT Argo data (no XBT data), NRT ECMWF surface fluxes, 7-d update cycle. OceanMAPS – 3-4-day forecasts using operational
system (fields will soon be
added). UKMet – Nowcasts
from the operational system … correct? HYCOM – 5-day behind real-time analyses … correct? Mercator – 14-day behind real-time analyses … correct? Comparisons are
presented for four regions in the south eastern -
Tropical east Indian Ocean (90-100E, 22S-20N) -
-
Timor Sea (100-120E, 22S-8S) -
South east Indian Ocean (90-120E,
40S-22S). -
South China Sea (100-120E,
2N-20N). These regions are
chosen as a subset of the Indian Ocean GODAE Inter-comparison region to
isolate the different dynamical regimes of the South-eastern Indian Ocean
circulation. Click here for image (~128K) Surface Drifting Buoys
SST
Mean and variance intercomparison SST
SSS
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