| Title | Tco639 NO_GS_SLHF Run Blocking Dates North Atlantic (47r3) |
|---|---|
| Description | Coupled ensemble reforecasts using the ECMWF IFS cycle 47r3, configured as follows. The atmosphere is set up with 15 ensemble members, 137 model levels and run on Tco639 cubic octahedral reduced Gaussian grids. The IFS is coupled hourly to a 75-level NEMO v3.4 ocean model and an LIM2 sea ice model, both utilising the ORCA025 tripolar grid with a grid spacing of approximately 0.25 degrees. The ocean and atmosphere are fully coupled throughout the 46-day forecast, producing output every 12 hours. Fifteen reforecasts are used. The atmospheric, land, and wave fields were initialised from ERA5, while the ocean and sea ice fields were initialised from OCEAN5 and ORAS5 respectively. These dates were chosen based on the occurrence of a cyclone over the North Atlantic preceding the initial block detected in the North Atlantic or Europe region, as observed from ERA5 data. The forecast was initiated approximately 4 days before the observed block was initially detected to allow the contributing cyclone to sufficiently interact with the Gulf Stream. Gulf Stream surface latent heat flux is turned off by applying a mask to the moisture transfer scheme, preventing moisture transfer where the mask is applied. This mask linearly relaxed, allowing complete moisture transfer after a distance of 5 degrees from the original mask. The mask roughly corresponds to the region of 200Wm^-{2} SLHF from wintertime ERA5 climatology in the North Atlantic and was applied throughout the entire run. |
| DOI | - |
| Experiment ID | hyig |
| Experiment class | ECMWF Research Department |
| Examples |
Tco639 NO_GS_SLHF run ensemble pressure level data Tco639 NO_GS_SLHF run ensemble surface level data |
Tco639 NO_GS_SLHF Run Blocking Dates North Atlantic (47r3)
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