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If the modification is straightforward and non-controversial, feel free to open 
a pull request simultaneously with the proposed changes.

Change proposals should include the following information as applicable.

# Title
Add a new chapter to explain how to report uncertainty values that correlate 
with data in the file
# Moderator
@user
# Moderator Status Review [last updated: YYYY-MM-DD]
Brief comment on current status, update periodically
# Requirement Summary
Proposing a new chapter to the CF convention to report uncertainty values in a 
netCDF file that correspond to a linked data variable(s). Since there is no one 
clear definition of an uncertainty, the proposal is flexible to accommodate 
many different types and shapes.
# Technical Proposal Summary
Brief proposal overview
# Benefits
Any data users who would like to include uncertainty values in a netCDF file 
with (or external) to the data file.
# Status Quo
Discussion of the current state CF and other standards.
# Associated pull request
Link to associated pull request, if present.
# Detailed Proposal
I have been working on a proposal for adding uncertainties to CF for a number 
of years. I've presented these proposals to the CF meetings and taken into 
account many suggestions. In addition to the proposals to the CF community I 
have engaged other communities to see their needs and how to accommodate as 
many use cases as possible. This has culminated in a working Google Doc 
(https://urldefense.us/v3/__https://docs.google.com/document/d/1UR0flhrEE3yw_3dKW8NpCrGymLt9idwFXJBhZ5ngX3Y/edit*__;Iw!!G2kpM7uM-TzIFchu!jivrEYabieP8UaOvvDV0hIbAkmSfpspdItv8o2yNlCja71g_5Fd5piHveZPWnk281yfV5WEh2p8$
 ) with the core proposal and examples. Most of the details of the proposal are 
best summed up in the Google Doc which also has permissions set to comments for 
anyone to add suggestions and comments.

The basic summary is to use ancillary variables to contain the uncertainty 
values with flexibility in how to represent the uncertainty values from 
scalars, to vectors, to external files, to formula to allow users to calculate 
uncertainty values.


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