PaulHamer
commented
5 years ago Thank you for your help, Alvaro. I have some further questions regarding the emissions used in the CAMS ensemble simulations.
As I understand it, the CAMS ensemble simulations are run using the TNO MACC emissions. Is it correct that the emissions are provided as annual averages, and then a temporal variation is applied to the annual emissions to derive time varying emissions at hourly resolution? Is this method for deriving hourly emissions identical across all of the models in the CAMS ensemble?
avaldebe
These are the responses Alvaro gave me in an email to the questions below (highlighted in bold):
However, I was wondering what meteorology is being used in the simulations produced for the EMEP reporting exercise?
The meteorology used on the status report is also IFS, but it is our own run. This is done to obtain fields that are not included on the operational forecasts, such as 3d precipitation. Also, this allow us to create a consistent multiyear dataset with the same IFS version, which are needed for trend analysis. (we have no control on when ECMWF updates the operational version of IFS, usually mid year)
Also, what meteorology is used for the CAMS reanalysis? Is that also IFS, or are you using a met model reanalysis, e.g., ERA?
There are 2 reanalysis runs on cams50:
Both IRA and VRA are driven by the operational IFS 00UTC forecast. In one of the projects that preceded CAMS, GEMS if remember correctly, I looked into using ERA to drive the VRA runs. At the time the ERA stored on MARS did not have all the required fields to drive the EMEP/MSC-W model.
I’m working on a report for the EEA and these questions came up when we began looking at differences between the CAMS ensemble and the EMEP runs (as part of EMEP).
I this case, you probably were reading about the IRA runs. In addition to the IRA runs, the CAMS50 ensemble also contains analysis runs (day after) and forecast runs (today + 3 day forecast).