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October CMOS Ottawa Lunch Meeting: Impact of the Various Observations Assimilated into the ECCC Global Deterministic Prediction System
October 17, 2019 @ 12:00 - 14:00$20
Speaker: Stéphane Laroche, Research Scientist / Meteorological Research Division, Environment and Climate Change Canada
Title: Impact of the Various Observations Assimilated into the ECCC Global Deterministic Prediction System
Abstract: The Global Deterministic Prediction System (GDPS) plays a central role in Environment and Climate Change Canada (ECCC) for the production of operational weather forecasts. This system provides medium-range forecasts and lateral boundary conditions to the Regional Deterministic Prediction System (RDPS) for short-range forecasts. The GDPS also supplies initial conditions for experimental prediction systems such as the Canadian Arctic Prediction System (CAPS), which provides km-scale forecasts over the Arctic for the Year of Polar Prediction (YOPP) campaigns. Both the GDPS and RDPS use a 4D-EnVar data assimilation system to produce the initial conditions. Near 13 million observations from space-based and terrestrial networks are assimilated daily. 88% of these observations are from 17 satellites. The remaining observations are from terrestrial networks such as aircraft, radiosondes, surface stations, ships and buoys. The impact of satellite and terrestrial observations on short to medium-range forecasts is not homogeneous over the globe, as revealed by recent Observing System Experiments (OSEs) as well as with Forecast Sensitivity to Observation Impact (FSOI) tools used for assessing the relative importance of observations on the short-range forecast skill. These tools are very useful for providing objective guidance on future implementation and rationalization of meteorological observing networks.
In this presentation, I will give an overview of the GDPS and present the observation impact studies recently conducted at ECCC and ECMWF, in particular, the OSEs carried out over the Arctic regions for YOPP.
Date: Thursday, October 17, 2019
Place: Rideau Canal Junior Ranks Mess, 4 Queen Elizabeth Drive, Ottawa. Side entrance, Harmony Room, 4th floor (elevator available)
Cost: $25 non members; $20 members & their spouses; students $10