Hawaiian Islands Operational System

Joao Marcos A C SouzaBrian Powell

Contributions:

Dax MattewsIvica Janekovic

Jim Potemra – Data management

Hawaiian Islands Operational System

PacIOOS is one of eleven regional observing programs in the U.S. that are supporting the emergence of the U.S. Integrated Ocean Observing System (IOOS®) under the National Oceanographic Partnership Program (NOPP).

The PacIOOS region includes the U.S. Pacific Region (Hawaii, Guam, American Samoa, Commonwealth of the Northern Mariana Islands), the Pacific nations in Free Association with the U.S. (Republic of the Marshall Islands, Federated States of Micronesia, Republic of Palau), and the U.S. Minor Outlying Islands (Howland, Baker, Johnston, Jarvis, Kingman, Palmyra, Midway, Wake).

Hawaiian Islands Operational System

http://oos.soest.hawaii.edu/pacioos/

Hawaiian Islands Operational System

Hawaiian Islands Operational System

Hawaiian Islands Operational System

~6km horizontal resolution

~2km horizontal resolution

~60m horizontal resolution

30 vertical layers

WRF forcing

TPXO tides

NCOM Boundary Conditions

Hawaiian Islands Operational System

The System assimilates (4DVar):

Along track SLA

Swath SST

HF radar velocities

Gliders, Argo floats and shipboard CTDs

Hawaiian Islands Operational System

Along track SLAEnvisatJason 1Jason 2

OSTM/Jason 2 map of sea-level anomalies from July 4 to July 14, 2008

SLA rmsd

Hawaiian Islands Operational System

Swath SSTModis – 2 primary satellite passes per day

SST

SST Bias

Hawaiian Islands Operational System

HF radars

Koko Head

Kaka'ako

Kalaeloa

(oos.soest.hawaii.edu/pacioos/voyager/index.html)

Radar radial mean currents

Radar mean currents after data qualification process and merge of all available antennas.

Radar radial mean currents

Radar mean currents after data qualification process and merge of all available antennas.

Radar radial currents rmsd

HIIG HIOG

Radar radial mean currents cross-spectrum - HIOG

HIOGPhase shift:

M2: -0.04hK1: -0.24h

Model

Radar

Radar radial currents HIOG – Mean and standard deviation

Radar radial currents EOF 1HIOG

48.11% 31.52%

Hawaiian Islands Operational System

Gliders (http://hahana.soest.hawaii.edu/seagliders/index.php), Argo floats, and shipboard CTD -

station ALOHA – established in 1988.(http://aco-ssds.soest.hawaii.edu/ALOHA/)

TS relations (gliders+argo)

TS relations (gliders+argo)

TS relations (gliders+argo)

TS relations (gliders+argo)

TS relations (gliders+argo)

T and S errors (model-observations)

0 - 10m 10 - 50m

Temperature

Salinity

0 - 10m 10 - 50m

Validation conclusions

More observed SLA variance on the windward side of the islands than shown by the model.Satellite tracks are too sparse in both time and spaceAnalyze impact of gridded products assimilation

Good representation of the water column structure, with problems concentrated near the surface.

Good representation of the barotropic tides, but less energy in the low frequency than shown by the HF radars.Analyze the impact of the internal tides on the differences between model and observations – Expected to by large.

SST diurnal variability is not accurately resolved by the simulation.

Modified vertical coordinate

σ (k )=− k2−2kN+k+N 2−N

N 2−N−ω k

2−kN1−N

second order Legendre polynomial.

Modified vertical coordinate

Quadratic σ, stretching 4;

linear σ, stretching 4;

linear σ, stretching 2;

HIIG grid section at 19.28°N

Modified vertical coordinate

Modified vertical coordinate

Small variation of the first layer thickness !