Data Assimilation (Code 7531)
Section Head: 7531@nrlmry.navy.mil

The Data Assimilation Section develops and applies techniques for the analysis and assimilation of atmospheric data, both conventional and remotely sensed, into multi-scale dynamic atmospheric prediction models. The primary systems used for this research are the three-dimensional NRL Atmospheric Variational Data Assimilation System (NAVDAS), and four-dimensional NAVDAS-AR (Accelerated Representer).

NAVDAS 2001 Source Book: Cover / Text

Products are transitioned to Fleet Numerical Meteorology and Oceanography Center for operational application.

The Data Assimilation Section is working in these main areas:

Data Pre-processing, Quality Assessment and Data Selection. 

• Data ingest, pre-processing and quality control techniques
• Observation and analysis monitoring tools.
• Satellite calibration and validation
• Bias removal techniques
  

Global, Mesoscale, and Tactical-scale Data Assimilation.

• Three and four-dimensional variational data assimilation
• Hybrid data assimilation using ensemble and variational methods
• Ensemble data assimilation
• High-resolution surface land and marine surface wind analysis
• Land surface assimilation
• Coupled atmosphere-ocean data assimilation
• Adjoint-based observation impact
• Targeted observations and observability
• Nonlinear and non-Gaussian data assimilation
• Stratospheric and mesospheric data assimilation
  

Assimilation of Remotely-Sensed and Non-conventional Data Sources.

• Satellite radiances
• Satellite retrievals (Atmospheric Motion Vectors, ocean surface winds, integrated water vapor, aerosol optical depth)
• Global Navigation Satellite Services (GPS)
• Hurricane reconnaissance data, HDOB flight level data, SFMR, dropsondes
• UAS/UAV – unmanned aircraft systems, unmanned aerial vehicle

Related Links:

• http://www.nrlmry.navy.mil/metoc/ar_monitor/
• http://www.nrlmry.navy.mil/obsens/