Questions tagged [era]
Questions about ECMWF re-analysis
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Is it possible to calculate dew point at pressure levels from ERA5 data?
I would like to calculate dew point values at different pressure levels from the ERA5 data set. Is this possible and if so, how exactly can it be done? I have found an approximate formula that use ...
3
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1
answer
315
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How to convert specific humidity ERA5 in kg/kg to g/kg or mm/day?
The specific humidity of ERA5 data is kg/kg, but some articles work with this variable in g/kg.
How can I convert this?
Or to compare with precipitation, evaporation, and other variables, how to ...
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2
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2
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867
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ERA5 Single Level - Calculate relative humidity
for ERA5 hourly data on single level relative humidity can not be downloaded. However, dewpoint temperature is given and in the description it is stated that "combined with temperature and ...
- 21
3
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221
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How accurate is ERA5 weather data?
We are using weather data to feed building energy models.
Historically, we would do that with weather from the closest weather station, which can be far away (up to 100 km, I guess).
Recently, we've ...
- 133
2
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2
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157
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What is the correct way to report historical daily Max / Min / Avg Temperature by City?
I starting a weather project where I'm using ERA5 hourly dataset (ref: https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=form). Using this dataset in python, I have ...
- 23
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51
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How to specify a certain place in a (CDS) weather data query?
I am trying to get time series data for a specific place (latitude and longitude) for different weather elements from the CDS datapool. Therefore, I am using the cdsapi package and can run queries ...
- 111
3
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112
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difference between different meteorological models
I need to work with historical weather data (temperature and precipitation), we use meteoblue.com.
There (https://docs.meteoblue.com/en/meteo/data-sources/data-sources#data-sources) they write about ...
- 133
7
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179
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Direct and Diffused component of shortwave radiation in ERA5 data
I am following the paper to calculate UTCI using ERA5 meteorological variables.
https://link.springer.com/article/10.1007/s00484-020-01900-5?shared-article-renderer
In the paper, the authors have ...
5
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2
answers
1k
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How to calculate 'real-world' geometric height from ERA reanalysis data
This seems like a really simple question, but I have been struggling for a couple of days to find an answer online or in the ERA documentation.
I am using ERA5 and ERA Interim reanalyses to get ...
- 51
7
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1
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Plotting ERA5 U/V Wind Data Using Python
Hello Earth Science Community,
I am a beginner Python programmer trying to plot a single time step of 10m surface wind data I grabbed from the ECMWF ERA5 reanalysis single level dataset in Python 3.8....
- 81
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Extracting point data from ERA5 CDS API
I have been extracting ERA5 data through the Web API. Now I am shifting to CDS API. In the web API I used the below code to download time series data at a particular lat/lon. In the CDS API, I can't ...
- 51
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164
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Why is ferret giving me error that the region is not 2D while plotting
I have downloaded ERA5 data and am trying to plot temperature variable. The problem I am facing is that even after providing a 2D area for plotting, ferret is giving an error saying that the region ...
- 299
3
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69
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ERA-5 data downloader... other than CDS-API?
The CDS API does not behave well on our machines. Has anyone had any luck scripting their own ERA-5 reanalysis large-data download script? Perhaps something that is not nearly as large, clunky, and ...
3
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795
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downloading ERA5 netCDF daily data for a decade, how to restrict location to reduce data size?
I have download ERA5 netCDF file in order to get precipitation monthly/daily rates for 11 years. But I have realized, there is no option to select my area of interest. It seems it is a big file to ...
- 31
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ERA5 mean evaporation rates data - Why is that negative?
Please, let me know if this question is too technical/specific for Earth Science. In case, I will remove it and eventually post it elsewhere.
I am processing some data extracted from ERA5 to set up a ...
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666
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How to calculate Lifted Index from ERA5 pressure level data?
I have taken a thunderstorm case where I need to calculate indices but I am not getting any code related stability indices in Python language, the code is available in GRADS, NCL for me it's difficult ...
4
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Error trying to download ERA5 data: Exception: Missing/incomplete configuration file: C:\Users\username/.cdsapirc
I am new with Python so please be kind.
I want to download data from ERA5 and so far I have installed the CDS API package and followed all the instructions from https://cds.climate.copernicus.eu/api-...
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1
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1
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82
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How reliable is sea-ice concentration (fraction) data in ERA-Interim?
I am using sea-ice data from the European Reanalysis from ECMWF (ERA Interim), but some grid cells over land have sea-ice information. Not a big issue so far, because spatial discretization must ...
- 607
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2
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338
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ERA-Interim how to select only grid-points over land area?
I am using ERA-Interim data, e.g. total precipitation, and I want to take only observations over land areas.
How can I filter the ERA-Interim dataset of precipitation to get only observations in grid-...
- 415
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4k
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Extracting Regional Data from ERA5
This is coming from a newcomer, so please be kind.
As I delve into the world of meteo data and reanalysis for the first time, I found that acquiring weather data is a lengthy process, so I'm shouting ...
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2
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1
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run the WRF model using ERA5
I want to run wrf chem with ERA 5. I followed this post https://dreambooker.site/2018/04/20/Initializing-the-WRF-model-with-ERA5/. Everything works fine unless I add surface pressure to surface data ...
4
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100
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Uncertainty In ERA-Interim data
Greeting,
What is the estimated uncertainty value in Temperature, relative humidity, U and V winds of ERA-Interim data?
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171
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Can we call the Precambrian eons (i.e. Archaic and Proterozoic) eras?
A diagram in a book I have places Archaic and Proterozoic under "eras".
Is such naming correct? ICS says they are eons, so do most sources I could find, but a 1979 volume of "Treatise on ...
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6
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107
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ERA Interim problem with Waves
Has anyone had a problem with significant wave height (swh) and mean wave period (mwp) from ERA-Interim not matching very well with either a time series of measurements or a different model? Or does ...
- 63
13
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103
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How are scatterometer observations standardised before being fed into reanalysis models?
This very basic question occurred to me during a talk on reanalysis data sets. Often we know the observations produced by a particular instrument, say rain radar, are biased from one year to the next ...
- 173
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757
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How to calculate 3-hour flux values in ERA-Interim?
Referring to the post:
https://www.myroms.org/forum/viewtopic.php?f=30&t=3003
I understood how to calculate the slhf and sshf for 03, 06, 09 and 12 time steps. But I have values for 00, 15, 18 ...
- 41
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1
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4k
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ERA Interim, how to handle total precipitation
I am trying to compute accumulated annual precipitation for year 2000-2001 based on the ERA Interim, but I am stuck with some unresolved questions:
If I download the synoptic monthly means of "total ...
- 33
2
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1
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293
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Why is radiation and total precipitation not available in ERA Interim Reanalysis at step 0?
ERA Interim reanalysis http://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc surface level variables such as radiation and precipitation, but also many others, are only available at time ...
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6
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886
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What is the meaning of step in ERA reanalysis data?
The webpage to download ERA data includes an option called "time" which is intuitive, but also an option called "step". I can't find an explanation of the meaning of this. It can't be a time step ...
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