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Stratospheric analysis and forecasting in the northern winter of 1999/2000: the nasa dao's geos-3 system
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Owens, Tommy Lamich, David Newman, Paul A. Ledvina, Andrea Pawson, Steven Lucchesi, Robert |
| Copyright Year | 2002 |
| Description | An evaluation is presented of the performance in the northern winter 1999/2000 of the GEOS-3 troposphere-stratosphere data assimilation system (DAS). The impacts of the two main input data types are assessed: upper-air soundings (sondes) provide wind and temperature information and satellite-based (Tiros Operational Vertical Sounders: TOVS) give estimates of the thermal structure. It is shown that in the low stratosphere (300-70hPa) the analyses are generally slightly warmer than the sonde data, but colder than the TOVS data; this relationship reverses between 70 and 10 hPa. There are geographical biases, related to the spatial and temporal coverage of the observation types and to the statistical weights assigned to them in the DAS. Forecasts show a tendency to reduce zonal asymmetries in the atmospheric flow and to suppress stratospheric temperature minima. In the DAS, the analysis increments compensate for this, but it leads to important biases in the multi-day forecasts. The analysis increments are as large as the diabatic forcing in the lower polar stratosphere, indicating a substantial model bias. The results provide important insights into the roles of different data types and the circulation model in producing accurate analyses for studies of polar chemistry and physical processes. |
| File Size | 2302359 |
| Page Count | 44 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020080784 |
| Archival Resource Key | ark:/13960/t0rr6st74 |
| Language | English |
| Publisher Date | 2002-06-19 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Temperature Distribution Physical Chemistry Satellite Sounding Stratosphere Atmospheric Sounding Forecasting Tiros Satellites Heat Transfer Wind Meteorology Geos 3 Satellite Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
