Questions tagged [era]

Questions about ECMWF re-analysis

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10
votes
0answers
82 views

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 ...
8
votes
1answer
714 views

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....
7
votes
2answers
3k views

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 ...
6
votes
2answers
674 views

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 ...
6
votes
2answers
100 views

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 ...
5
votes
1answer
319 views

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 ...
4
votes
1answer
82 views

Uncertainty In ERA-Interim data

Greeting, What is the estimated uncertainty value in Temperature, relative humidity, U and V winds of ERA-Interim data?
4
votes
1answer
41 views

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 ...
4
votes
0answers
160 views

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 ...
3
votes
1answer
4k views

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 ...
3
votes
1answer
647 views

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 ...
3
votes
1answer
281 views

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 ...
3
votes
0answers
33 views

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 ...
3
votes
0answers
56 views

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 ...
2
votes
1answer
284 views

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 ...
2
votes
1answer
2k views

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-...
2
votes
1answer
955 views

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 ...
2
votes
0answers
45 views

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 ...
1
vote
2answers
183 views

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-...
1
vote
1answer
159 views

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 ...
1
vote
1answer
67 views

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 ...
1
vote
0answers
42 views

What was the reason why scientists divided the Mesozoic era into three periods? [closed]

When scientists divided the Mesozoic era into the Triassic period, Jurassic period, and Cretaceous period, what was their rational for those three particular divisions? From my readings, it seems the ...
0
votes
0answers
27 views

Equivalent of geo.extract_point function in cdsapi

After downloading the data from ERA5-reanalysis, I just need to extract weather at a certain lat, lon. In cds toolbox, geo.extract_point function is handy. However, I could not find similar function ...
0
votes
0answers
139 views

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 ...