Home page  
Home   Your Room   Login   Contact   Feedback   Site Map   Search:  
Discover this product  
About Us
Overview
Getting here
Committees
Products
Forecasts
Order Data
Order Software
Services
Computing
Archive
PrepIFS
Research
Modelling
Reanalysis
Seasonal
Publications
Newsletters
Manuals
Library
News&Events
Calendar
Employment
Open Tenders
   
Home > Research > Ifsdocs > OBSERVATIONS >  
   

IFS documentation Front Page


Table of contents
Chapter 1. Non-IFS observation processing (OBSPROC): General overview

Chapter 2. Observations: Types, variables and error statistics

Chapter 3. CMA creation (MAKEMA)

Chapter 4. The FEEBACK task

Chapter 5. The TOOLS task

Chapter 6. Central-memory array (CMA) structure/format

Chapter 7. BUFR feedback data structure/format

Chapter 8. SIMULATED-observations data structure/format

Chapter 9. NAMELISTS

Chapter 10. Processing of scatterometer data

REFERENCES
 
  Next Section
Previous Section


7.1 Basic concept




The idea with BUFR feedback data is to store, in addition to the original input BUFR data, all relevant observation-related information gathered during the data-assimilation cycle. This information is:
1)   TOVS/SSMI/SCAT "PRESAT"
2)   Report events and status,
3)   Analysis variables,
4)   Analysis variables flags:
  Final flag,
  First guess flags,
  Departure flag,
  Analysis qc flags,
  Blacklist flags
5)   Analysis variables events and status:
  Events 1,
  Events 2,
  Blacklist events, and
  Status
6)   Analysis variables data qc constants:
  Probability of gross error, and
  Range of possible values
7)   Analysis variables error statistics:
  Final obs. error,
  Prescribed obs. error,
  Persistence obs. error,
  Representativeness obs. error, and
  First guess error
8)   Analysis variables departures:
  First guess departure,
  Update departures:
  Initial update departure,
  Initial high resolution departure,
  Initial low resolution departure,
  Final low resolution departure, and
  Simulation departure
  Final analysis departure


This is done, as already said, by appending the original input BUFR data with the new information. Each of the items of information mentioned above forms a separate section. Thus, there may be seven main feedback sections, of which some may have a few subsections. Each of these sections/subsections starts by first declaring what it is, by using BUFR (unexpanded) descriptors followed by the actual information.


The first-mentioned feedback section (TOVS/SSMI/SCAT "PRESAT") exists only in the case of satellite observations.


Next Section
Previous Section



 

Top of page 16.04.2002
 
   Page Details         © ECMWF
shim shim shim