Assimilation techniques ( 3 ) : 3 dVar April 2001

Assimilation Techniques ( 4 ) : 4 dVar April 2001

2. COMPARISON BETWEEN THE ECMWF 3DVAR AND 4DVAR SYSTEMS The ECMWF 4dVar system is, from the technical point of view, very similar to the 3dVar system. Both systems use the same unix scripts, and share much of the Fortran code. The same background error covariance matrix and observation operators are used, and most of the peripheral tasks such as fetching and archiving of fields and observations...

Assimilation of Radar Radial Velocity Data with the WRF Hybrid 6 Ensemble - 3 DVAR System for the Prediction of Hurricane Ike ( 2008 )

A three-dimensional variational data assimilation system for multiple aerosol species with WRF/Chem and an application to PM2.5 prediction

A three-dimensional variational data assimilation (3-DVAR) algorithm for aerosols in a WRF/Chem model is presented. The WRF/Chem model uses the MOSAIC (Model for Simulating Aerosol Interactions and Chemistry) scheme, which explicitly treats eight major species (elemental/black carbon, organic carbon, nitrate, sulfate, chloride, ammonium, sodium and the sum of other inorganic, inert mineral and ...

Ocean State and Surface Forcing Correction using the ROMS - IS 4 DVAR Data Assimilation System

Gary Brassington is first introducing this newsletter with a paper telling us about the international summer school for “observing, assimilating and forecasting the ocean” which will be held in Perth, Western Australia in 11-22 January 2010 (http://www.bom.gov.au/bluelink/summerschool/). The course curriculum will include topics covering the leading edge science in ocean observing systems, as w...

The role of Japanese Candlestick in DVAR model

The decomposition-based vector autoregressive model (DVAR) provides a new framework for scrutinizing the efficiency of technical analysis in forecasting stock returns. However, its relationships with other technical indicators still remain unknown. This paper investigates the relationships of DVAR model with the Japanese Candlestick indicators using simulations, theoretical explanations and emp...