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Fishing and Ocean Data in WeatherNet


Sea Surface Temperature
Sea surface temperature in GRIB format is available from the RTOFS, HYCOM and GHFSST Global models and RTOFS HiRes Atlantic model. All models are updateddaily but, of course, the HiRes Atlantic model provides data only for the Atlantic Ocean basin. GHRSST data represents a composite of all the satellite passes over a given location on the day before today. The spatial resolution of the RTOFS Global and HYCOM data is 0.083 x 0.083 degrees (1/12th degree). The spatial resolution of the RTOFS HiRes Atlantic data is 0.05 x 0.05 degrees (1/20th degree) and the GHRSST data is at 0.01 degrees. The HYCOM data alsoprovides forecasts of temperature data out to 5 days.

Sea Surface Height
Sea surface height data in GRIB format is available from the RTOFS and HYCOM Global model and RTOFS HiRes Atlantic model. All models are updated daily but, of course, the HiRes Atlantic model provides data only for the Atlantic Ocean basin. The spatial resolution of the RTOFS and HYCOM Global data is 0.083 x0.083 degrees (1/12th degree). The spatial resolution of the RTOFS HiRes Atlantic data is 0.05 x 0.05 degrees (1/20th degree). The HYCOM data also provides forecasts of sea surface height data out to 5 days.

Sea Surface Salinity
Sea surface salinity data in GRIB format is available from the RTOFS and HYCOM Global model and RTOFS HiRes Atlantic model. All models are updated daily but, of course, the HiRes Atlantic model provides data only for the Atlantic Ocean basin. The spatial resolution of the RTOFS and HYCOM Global data is 0.083 x0.083 degrees (1/12th degree). The spatial resolution of the RTOFS HiRes Atlantic data is 0.05 x 0.05 degrees (1/20th degree). The HYCOM data also provides forecasts of sea surface salinity data out to 5 days.

Sea Surface Currents
Sea surface currents data in GRIB format is available from the RTOFS and HYCOM Global model and RTOFS HiRes Atlantic model. All models are updated daily but, of course, the HiRes Atlantic model provides data only for the Atlantic Ocean basin. The spatial resolution of the RTOFS and HYCOM Global data is 0.083 x0.083 degrees (1/12th degree). The spatial resolution of the RTOFS HiRes Atlantic data is 0.05 x 0.05 degrees (1/20th degree). The HYCOM data also provides forecasts of sea surface currents data out to 5 days.

Mixed Layer Depth
Mixed layer depth data in WeatherNet is only available for the Atlantic basin. It is sourced from the RTOFS Atlantic ocean model at a spatial resolution of 0.132 deg lat by 0.068 long. One forecast is produced each day.

Chlorophyll
Chlorophyll data is obtained from sensors on three satellites. These satellites are the VIIRS, MODIS A and MODIS T. Data is at a spatial resolution of 4 km (1/25 degree) and are presented in two forms--a daily, most recent pass output and an 8 day composite. The daily output is a synthesis of all the passes by a given satellite for the subject day. It is generally available by 12 UTC of the day following the collection day...these are satellite observations, not modelled outputs, that have been converted to a GRIB format. The 8 day composite is, as the name suggests, a collection of all the passes from a given satellite sensor over an 8 day period. Because the chlorophyll sensors are observing ocean features which can be obscured or contaminated (from the perspective of a clean view reaching the satellite) by cloud cover, single day passes may contain large areas where no data could be reliably observed.

The 8 day composite takes a big step towards addressing this by analyzing all the data collected by a given satellite over an 8 day period. If an area of the ocean is obscured by clouds on day 1, perhaps this location will be cloud-free on one or more days 2 through 8. If it is, data is pulled from that pass and used to 'fill in' the target ocean region. If an area is cloud-free for more than one day, the most recent day always replaces the older data. The result is an 8 day composite file which typically contains much more usable information for a given ocean area than the single-day, 'most recent' files...

 

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