Model Adjoint Sensitivity Impacts 1. 2 Operational ECMWF system September to December 2008. Averaged over all model layers and entire global atmosphere.

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Presentation transcript:

Model Adjoint Sensitivity Impacts 1

2 Operational ECMWF system September to December Averaged over all model layers and entire global atmosphere. % contribution of different observations to reduction in forecast error. Courtesy: Carla Cardinali and Sean Healy, ECMWF Forecast error contribution (%) Note: 1) Sounders on Polar Satellites reduce forecast error most 2) Results are relevant for other NWP Centers, including NWS/NCEP

Total Impact beneficial Total Impact AMSU-A radiances have the largest impact globally, but conventional data (raob, aircraft) still very important. GPSRO now a significant contributor. Impact Per Observation Raobs get large weight in the analysis and have large IPO. Ship obs are few, but are located where there are few other in-situ data. Impact of Various Observing Systems in GEOS-5 01 Sep – 31 Dec z Impact Per Observation 3

4 Much larger relative impact of AMVs in Navy system compared to NASA’s. Note that IASI has moved up in NASA system compared to 2010 (previous slide), and GPSRO has moved down as COSMIC ages/degrades. ms/fp/obs_impact/ _main_od.html FSO diagnostics (Gelaro, 5 th WMO Impact Workshop, Sedona 2012)