NRT Monitoring: Operational Model Upgrades


A comprehensive list of operational changes made at ECMWF and the Met Office can be found at:

https://www.ecmwf.int/en/forecasts/documentation-and-support/changes-ecmwf-model (ECMWF)
https://code.metoffice.gov.uk/trac/nwpscience/wiki/ModelInfo/global/history (Met Office - page only visible to registered users).

A selected list of changes relevant to GNSS-RO is given in the table below:


Centre
Upgrade date
Upgrade version
Comments
ECMWF
18/05/2011
cy37r2
Tangent point drift used in the GNSS-RO operator
ECMWF
15/11/2011
cy37r3
Aircraft bias correction should reduce ECMWF BA bias in UT/LS
ECMWF
26/06/2013
cy38r2
Improved vertical interpolation used in 1D operator. Forecast model vertical resolution increased to use 137 levels
ECMWF
12/05/2015
cy41r1
2D GNSS-RO operator. Model changed to using semi-lagrangian interpolation, which reduced noise in the stratosphere
ECMWF
08/03/2016
cy41r2
Assumed GNSS-RO bending angle errors above 10 km increased from 1% to 1.25%
ECMWF
11/07/2017
cy43r3
Tighter quality control applied to GNSS-RO data
Met Office
20/01/2015
N/A
Bending angle and refractivity forward models upgraded for monitoring to reduce systematic biases
Met Office
03/02/2015
PS35
Numerous changes, including implementation of the improved bending angle forward model for operational RO assimilation
Met Office
15/03/2016
PS37
Numerous changes including the implementation of variational bias correction
Met Office
15/11/2017
N/A
Improved consistency in the forward model operator used by different systems. Avoids small jump in the biases that occurred from time to time

This list describes changes to the operational global NWP systems at the Met Office and ECMWF.  Such changes can affect the model backgrounds which are used to produce the NRT monitoring plots.  Anticipated changes will be posted here in advance of the upgrades.

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