IFS Documentation front page

I Observations
II Assimilation
III Dynamics
IV Physics
V Ensemble
VI Technical
VII Waves

Part II: Data assimilation

CHAPTER 10 Observation screening

Table of contents

10.1 Introduction

10.2 The structure of the observation screening

10.2.1 The incoming observations

10.2.2 The screening run

10.2.3 General rationale of the observation screening

10.2.4 3D- versus 4D-Var screening

10.3 The independent observation screening decisions

10.3.1 Preliminary check of observations

10.3.2 Blacklisting

10.3.3 Background quality control

10.4 Screening of satellite radiances

10.4.1 General

10.4.2 Input

10.4.3 Bias correction

10.4.4 Quality control

10.4.5 Retrieval

10.4.6 SSM/I radiances

10.4.7 Geostationary clear-sky radiances

10.5 Scatterometer processing

10.5.1 Introduction

10.5.2 Background and general Scatterometer geometry

10.5.3 Location of scatterometer data in the ECMWF archives

10.5.4 ESA scatterometer (ERS-1 and ERS-2) processing

10.5.5 NASA scatterometer (NSCAT) processing

10.5.6 NASA "QUIK" scatterometer (QuikSCAT) processing

10.6 The dependent observation screening decisions

10.6.1 Update of the observations

10.6.2 Global time-location arrays

10.6.3 Vertical consistency of multilevel reports

10.6.4 Removal of duplicated reports

10.6.5 Redundancy check

10.6.6 Thinning

10.6.7 A summary of the current use of observations

10.6.8 Compression of the ODB

10.7 A massively-parallel computing environment