New Table B descriptors, Sea-surface height anomaly measurement

[marijanacrepulja]

Initial request

In support to assimilation of sea surface height anomalies in ocean models, there is a need to represent available measurements in BUFR. Raw observations are in netCDF format.

CMEMS-SL-PUM-008-032-068.pdf

Amendment details

1. Add a new table B descriptor 0-08-xxx for Type of sea surface height anomaly measurement

F X Y	ELEMENT NAME	UNIT	SCALE	REFERENCE VALUE	DATA WITH (bits)
0-08-027	Type of Sea-surface height anomaly measurement	Code table	0	0	8

2. Add a new CODE/FLAG TABLE 0-08-027 for Type of sea surface height anomaly measurement

Code	Type of Sea-surface height anomaly measurement
0	Unfiltered, raw measurement including noises
1	Filtered, low-pass filtered sea surface height for noise reduction
2-254	Reserved
255	Missing value

3. Add a new table B descriptor 0-21-xxx for Dynamic atmospheric correction

F X Y	ELEMENT NAME	UNIT	SCALE	REFERENCE VALUE	DATA WITH (bits)
0-21-020	Dynamic atmospheric correction	Numeric	3	-65536	17

Comments

No response

Requestor(s)

Marijana Crepulja (ECMWF)
Philip Browne (ECMWF)

Stakeholder(s)

Enter list of stakeholder(s).

Publication(s)

Example: Manual on Codes (WMO-No. 306), Volume I.2, BUFR code table 0 08 xxx

Expected impact of change

MEDIUM

Collaborators

No response

References

No response

Validation

No response

[amilan17]

https://github.com/wmo-im/tt-tdcf/wiki/2024.11.13.tt.tdcf notes:

• Marijana introduced the proposal
• Sibylle recommends assigning more bits; Marijana will update to 8 bits;
• Marijana will provide samples

[marijanacrepulja]

Sample: sea_anomaly.zip
Branch is updated.

[amilan17]

https://github.com/wmo-im/et-data/wiki/2024.12.04.et.data notes:

• branch is ready for validation
• Sergio reviewed the sample and recommends something .... @sergioh-pessoal please add comments to this issue
• Marijana will double check the sample data

[sergioh-pessoal]

I decoded the sample and noticed that it was coded as category BUFR = 5 (Single level upper-air data (satellite). In my understanding "Sea Surface Height Anomaly Measurement" would be more appropriately coded in another category. Perhaps 12 "Surface Data (Satellite)"