Legend
○ Argo
◆ Glider
⇉ Radar
> Drifter
○ Ship
Legend
- ○
- Argo
- ◆
- Glider
- ⇉
- Radar
- >
- Drifter
- ○
- Ship
Four-hour SST
Four-hour SST is a 4-hour composite SST produced every 4 hours at 2km resolution, using all available satellite SST:
- 10min Himawari-8 (Him8) from the Bureau of Meteorology
- N15, N18, N19 from BoM
- MetopA & MetopB from NOAA
- VIIRS Suomi-NPP from NOAA
Method: Step 1: 4-hour composites of Him8 SST (with 2-4km resolution) are made, taking the median SST at every pixel. Step 2: the final composite is made using the Him8 composite and all other available AVHRR and VIIRS SST. The composite is made in two steps so that if the BoM Him8 SST is unavailable we can replace it with NOAA hourly Him8 composites. All SST is adjusted by the SSES bias before compositing and an offset of 0.17C is added to obtain the bulk SST.
Available: 11 Aug 2017 to present
SST: All SST of QL>=4 (QL=4 or 5 are the BoM's highest Quality Levels)
Filled SST: the gaps in the SST are filled with the most recent previous composites
SST Age: the age of the Filled SST
Wind Speed: BoM ACCESS-R 3hr average wind speed and direction for the analysis time
Four-hour SST
○ Argo:
pink circle at the location of any profile made in the window t0 +/- 12hrs; click on the circle to see the Argo profiles of temperature and salinity.
◆ Glider:
small diamonds (pink and black) indicate 6-hourly glider locations,
pink when the glider is in the 24hr window around t0; click on the diamonds to see the glider profiles.
⇉ Radar:
the average velocity using all available hourly radar velocities from the IMOS radar facility
within a specified time window around t0.
Eg (3-12h avg) indicates a minimum of 3 hourly radar velocity estimates are required within a 12 hour window.
Blue (red) vectors are plotted over waters warmer (cooler) than the mean value in the colorbar axis.
> Drifter:
6 hourly Global Drifter Program surface drifter (drogued at 15m on deployment) within a window of -2 to +1 day around t0.
Location and velocity are indicated with pink arrow heads.
○ Ship:
Underway water temperature, plotted hourly, from ships with hull-mounted intake. These include the RV Investigator (MNF), RV Solander and RV Cape Ferguson (AIMS), and the Spirit of Tasmania 2, Sea Flyte and Stadacona from (IMOS Ships of Opportunity Facility).
Data within t0 +/- 1day is indicated with a small black dot at the ship location and a black
circle indicates the measurement occurred within 12 hours of t0.
Selected isobaths: grey and cyan contours, in metres.
Gridded Sea Level (GSL): white contours every 0.1 m.
Geostrophic velocity: black arrows, where length indicates both speed and distance something would travel over a 12hr or 24hr period (as indicated) at this velocity.
The latest GSLA (NRT00) is usually 4 days behind real time - the date of the GSLA and velocity vectors is indicated on the plot.