|Title||Jason-2 OGDR wind and wave products: Monitoring, validation and assimilation|
|Publication Type||Technical memorandum|
|Year of Publication||2009|
|Secondary Title||ECMWF Technical Memorandum|
|Authors||Abdalla, S, Janssen, PAEM, Bidlot, J-R|
Jason-2 fast delivery OGDR-BUFR products have been received at ECMWF since August 2008. Altimeter surface wind speed and Ku-band significant wave height (SWH) products are monitored and validated against operational ECMWF atmospheric and wave model results in addition to the available observations. It was found that those products are, in general, of good quality. The Ku-band SWH, in particular, is better than its Jason-1 counterpart. However, the wind speed algorithm is in need of some improvements. Several experiments were carried out to assess the impact of assimilating Jason-2 SWH in the ECMWF wave model. The model analysis and forecast fields were verified using available observations and the model own analysis. The results show good impact of the data. This led to the operational assimilation of Jason-2 SWH (in addition to Envisat data) into the operational ECMWF model replacing Jason-1 SWH on 10 March 2009. Further experiments were carried out to assess the impact of adding Jason-1 SWH data after the shift to a separate orbit than Jason-2. The impact is positive but rather limited. This led to the reintroduction of Jason-1 SWH product into the ECMWF wave model on 8 June 2009.