ERA5 weather variables have incorrect units and names

Nobody has claimed this yet.

Version Checks (indicate both or one)

I have confirmed this bug exists on the lastest release of atlite.
I have confirmed this bug exists on the current master branch of atlite.

Issue Description

Units and names for multiple variables in era5 are incorrect.

Here are the units and long_names extracted from an example cutout:

Variable	Reported `units`	Correct `units`	Reported `long_name`	Correct `long_name`
`height`	`m2 s-2`	`m`	`Geopotential`	`Height`
`wnd100m`	`m s**-1`	`m s**-1`	`100 metre wind speed`	—
`wnd_shear_exp`	`` (empty)	`` (empty)	`wind shear exponent`	—
`wnd_azimuth`	`m s**-1`	`rad`	`100 metre U wind component`	`100 metre wind azimuth`
`roughness`	`m`	`m`	`Forecast surface roughness`	—
`influx_toa`	`W m**-2`	`W m**-2`	`TOA incident short-wave ...`	—
`influx_direct`	`W m**-2`	`W m**-2`	`Surface direct short-wave ...`	—
`influx_diffuse`	`W m**-2`	`W m**-2`	`Surface diffuse solar ...`	—
`albedo`	`(0 - 1)`	`(0 - 1)`	`Albedo`	—
`solar_altitude`	`rad`	`rad`	`latitude`	`solar altitude`
`solar_azimuth`	`rad`	`rad`	`latitude`	`solar azimuth`
`temperature`	`K`	`K`	`2 metre temperature`	—
`soil temperature`	`K`	`K`	`Soil temperature level 4`	—
`dewpoint temperature`	`K`	`K`	`2 metre dewpoint temperature`	—
`runoff`	`m`	`m`	`Runoff`	—

I see 4 issues:

height is still listed in geopotential units m**2 s**-2, even though it is converted to m.
wnd_azimuth is in velocity units m s**-1 even though it's an angle and should be in rad
solar_altitude and solar_azimuth inherit the latitude long name from the locational variables that are used to calculate them
Capitalisation of long_name's is inconsistent, some start with a capital and some don't.

Reproducible Example

import atlite

# should download pretty fast, same as conftest
cutout = atlite.Cutout(
    path="mre_era5.nc",
    module="era5",
    bounds=(-4, 56, 1.5, 62),
    time="2013-01-01",
)
cutout.prepare()

print(f"{'variable':22s} {'units':12s} long_name")
print("-" * 70)
for v in cutout.data.data_vars:
    attrs = cutout.data[v].attrs
    print(f"{v:22s} {str(attrs.get('units', '')):12s} {attrs.get('long_name', '')}")

Expected Behavior

units are physically correct

Installed Versions

argcomplete==3.1.4
attrs==23.2.0
Babel==2.10.3
bcc==0.29.1
bcrypt==3.2.2
beautifulsoup4==4.12.3
blinker==1.7.0
Brlapi==0.8.5
Brotli==1.1.0
certifi==2023.11.17
chardet==5.2.0
click==8.1.6
cloud-init==25.3
colorama==0.4.6
command-not-found==0.3
configobj==5.0.8
cryptography==41.0.7
cssselect==1.2.0
cupshelpers==1.0
dbus-python==1.3.2
defer==1.0.6
defusedxml==0.7.1
distro==1.9.0
distro-info==1.7+build1
duplicity==2.1.4
fasteners==0.18
html5lib==1.1
httplib2==0.20.4
idna==3.6
Jinja2==3.1.2
jsonpatch==1.32
jsonpointer==2.0
jsonschema==4.10.3
language-selector==0.1
launchpadlib==1.11.0
lazr.restfulclient==0.14.6
lazr.uri==1.0.6
libevdev==0.5
louis==3.29.0
lxml==5.2.1
Mako==1.3.2.dev0
Markdown==3.5.2
markdown-it-py==3.0.0
MarkupSafe==2.1.5
mdurl==0.1.2
meson==1.3.2
monotonic==1.6
netaddr==0.8.0
netifaces==0.11.0
numpy==1.26.4
oauthlib==3.2.2
olefile==0.46
openshot-qt==3.5.1
packaging==24.0
paramiko==2.12.0
pexpect==4.9.0
pillow==10.2.0
pipx==1.4.3
platformdirs==4.2.0
psutil==5.9.8
ptyprocess==0.7.0
py==1.11.0
pycairo==1.25.1
pycups==2.0.1
Pygments==2.17.2
PyGObject==3.48.2
PyJWT==2.7.0
PyNaCl==1.5.0
pyparsing==3.1.1
PyQt5==5.15.10
PyQt5-sip==12.13.0
PyQtWebEngine==5.15.6
pyrsistent==0.20.0
pyserial==3.5
python-apt==2.7.7+ubuntu5.2
python-dateutil==2.8.2
python-debian==0.1.49+ubuntu2
pytz==2024.1
pyudev==0.24.0
pyxdg==0.28
PyYAML==6.0.1
pyzmq==24.0.1
requests==2.31.0
rich==13.7.1
rofication==1.2.2
scour==0.38.2
sentry-sdk==1.39.2
setuptools==68.1.2
six==1.16.0
soupsieve==2.5
systemd-python==235
typing_extensions==4.10.0
ubuntu-drivers-common==0.0.0
ubuntu-pro-client==8001
ufw==0.36.2
unattended-upgrades==0.1
urllib3==2.0.7
usb-creator==0.3.16
userpath==1.9.1
wadllib==1.3.6
webencodings==0.5.1
wheel==0.42.0
xdg==5
xkit==0.0.0

Start with the era5 module and the Cutout preparation path, using the issue's reproducible example and the existing conftest setup to inspect generated variable attributes. Update the metadata for the four reported issues and verify that the affected units and long_name values are physically correct and consistently capitalized.

Written by the indexing model from the issue text.

Description

Version Checks (indicate both or one)

Issue Description

Reproducible Example

Expected Behavior

Installed Versions

Contributor guide

First steps

Research direction

Assessment

ERA5 weather variables have incorrect units and names

Description

Version Checks (indicate both or one)

Issue Description

Reproducible Example

Expected Behavior

Installed Versions

Contributor guide

First steps

Research direction

Assessment

Get new issues in your inbox