Comments (10)
Dear @jbathegit and @AndrewBenjamin-NOAA ,
I have a couple of comments regarding your proposal.
-
regarding entries in discipline 10, category 2: I would suggest that you use entries 173 and 175 from Code Table 4.5 in conjonction with your proposed entry 10/2/27 for snow thickness over sea ice. Note that if you are interested in the more accurate snow mass per unit area over sea ice ( m3 m-2 which is also units "m" by cancelation), then you should use entry 10/2/16 . This is more accurate than the physical thickness (what you propose) as it is independent of the snow density.
-
regarding entries in discipline 10, category 4: we have very similar parameters at ECMWF that we encode using sigma theta instead of rho but with the same density difference of 0.125 and 0.03. You can see them here:
Could you check that these are not the same? I know that there are multiple to compute density of sea water depending on temperature, pressure and salinity: rho, sigma, sigma-t, sigma theta, etc.
In any case, if you require specificically "rho", I would suggest that you create a new type of level in code Table 4.5 similar to entries 169, 170 and 171.
from grib2.
@sebvi I will consult with the requesting developer and provide an update. One quick note: I still see 173 as reserved in Code Table 4.5, did you mean 174?
from grib2.
I have collected feedback from several developers and here is what was proposed:
-
Snow thickness (on ice) (10/2/27): Will use entry from 10/2/16
-
Mixed layer depth (delta rho) (10/4/52-53) Received confirmation from the developers that the calculation from the 2 EMCWF fields provided and what is done here are not the same. It was suggested that 10/4/14(water depth) be used in lieu of adding the 2 original fields, with an update to Table 4.5
Here is a revised new parameters list for Code table 4.2, Discipline 10 (Oceanographic products):
Category 2 (Ice):
Name | Discipline | Category | Parameter | Units |
---|---|---|---|---|
Freezing/melting potential | 10 | 2 | 27 | W m-2 |
Melt onset date | 10 | 2 | 28 | Numeric |
Freeze onset date | 10 | 2 | 29 | Numeric |
And an additional entry in table 4.5 to accurately depict fixed levels based on density using rho:
Name | Parameter |
---|---|
Ocean level defined by water density (rho) difference from near-surface to level | 172 |
from grib2.
following @AndrewBenjamin-NOAA feedback and proposed changes to the original request, I fully support this proposal.
from grib2.
Thanks @AndrewBenjamin-NOAA and @sebvi, and FYI that I just updated the proposal in the first (main) post of this thread to reflect the revised agreement, since that's typically where everyone goes to see the details.
In other words, people may not necessarily scroll down through the entire thread to read and digest the ensuing discussion, so I think it's a good idea if the top post of the thread always contains the details of the latest version :-)
from grib2.
https://github.com/wmo-im/CCT/wiki/Teleconference.17.18.October.2023 notes:
Jeff presented the proposal; team agrees to the proposal; @amilan17 create branch
from grib2.
I just started updating this branch in GitHub, and I just wanted to clarify something:
Should the new CT 4.5 entry have a unit of kg m-3
to match that of existing entry 169 in CT 4.5? Or is it unitless and should just be listed in the table as -
for the Unit column?
Please let me know, and sorry that the science behind this is a bit out of my swim lane ;-)
from grib2.
Good questions @jbathegit. Waiting to hear back from GFS ocean developers, will provide clarification shortly.
from grib2.
https://github.com/wmo-im/CCT/wiki/Teleconference.21.22.November.2023 notes:
branch still needs to be updated;
from grib2.
The 222-new-ocean-and-ice-parameters-in-code-table-42-discipline-10-1 branch has now been updated - thanks!
I just wanted to clarify with the above URL, because it looks like there's also a second duplicate branch 222-new-ocean-and-ice-parameters-in-code-table-42-discipline-10 (i.e. without the trailing -1
), and I didn't update that second one.
from grib2.
Related Issues (20)
- Code Table 4.2 : new fire parameters HOT 3
- Code Tables 4.1, 4.2 and 4.5: new entries for ERA6 and Destination Earth datasets HOT 7
- New section 3 grid template: The HEALPix grid HOT 35
- Code Table 4.2, discipline 0, category 19: new entries for persistent contrails HOT 4
- Code Table 1.3 : adding Destination Earth entries HOT 5
- Missing code table entry in 4.59, typo in template 4.78, HOT 5
- new section 4 for encoding quantiles of post-processed products HOT 15
- Template 3.130 Irregular Latitude/longitude grid: deprecated or non-existent? HOT 1
- Spelling error in Code Table 4.0
- new entry for "Convectively-induced turbulence" in Code Table 4.2 HOT 7
- Additional entry of length or number of octets in GRIB2_Template_ csv-files HOT 5
- Code Table 4.2 : adding new parameters HOT 5
- Encoding of Drought indexes as defined by WMO HOT 8
- new probability templates for large ensemble HOT 9
- new templates for probability forecasts based on focal statistics HOT 8
- new section 4 template for further statistics on probabilities based on focal statistics HOT 6
- new hydrology parameters in code Table 4.2 HOT 4
- new fire weather parameter in Code Table 4.2, Discipline 2 HOT 12
- new precipitation type flag in Code Table 4.201 HOT 9
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from grib2.