Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Home 
 People 
 Current 
 Affiliates 
 Visitors 
 Students 
 Research 
 ICAM-LANL 
 Publications 
 Conferences 
 Workshops 
 Sponsorship 
 Talks 
 Colloquia 
 Colloquia Archive 
 Seminars 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 CMS Colloquia 
 Q-Mat Seminars 
 Q-Mat Seminars Archive 
 P/T Colloquia 
 Archive 
 Kac Lectures 
 Kac Fellows 
 Dist. Quant. Lecture 
 Ulam Scholar 
 Colloquia 
 
 Jobs 
 Postdocs 
 CNLS Fellowship Application 
 Students 
 Student Program 
 Visitors 
 Description 
 Past Visitors 
 Services 
 General 
 
 History of CNLS 
 
 Maps, Directions 
 CNLS Office 
 T-Division 
 LANL 
 
Tuesday, March 19, 2013
1:00 PM - 2:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Seminar

Ensemble-based data assimilation for GITM: assimilating CHAMP neutral density and GPS TEC measurements

Alexey Morozov
University of Michgan

This talk demonstrates data assimilation for the global ionosphere-thermosphere model (GITM). In particular, the ensemble adjustment Kalman filter (EAKF) is shown to estimate model states (densities, temperatures, and velocities for various species) and a model driver (F10.7). Innovative ensemble approach tailored for driver estimation is shown to improve error performance compared to the traditional inflation approaches. The measurements used in the simple assimilation cases come from the Challenging Minisatellite Payload (CHAMP) and then are increased in complexity to use the GPS vertical total electron content (TEC) measurements. TEC measurements are shown to have a more global effect than the CHAMP measurements, but in both cases model bias is removed and the model driver is estimated.

Host: Humberto Godinez