MERRA 2 - Windspeed V50M missing @ 50.0N/3.125E

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anaknittel
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MERRA 2 - Windspeed V50M missing @ 50.0N/3.125E

by anaknittel » Wed Jul 06, 2022 12:36 pm America/New_York

I am looking for wind data of northern France - 50N3.125E - from 2021-02-28 to 2022-05-31, and the V50M is not available. Upon creating the download links, the parameters I am looking for are correct, however, after extracting them - V10M, U10M, T10M and U50M are fine - V50M is missing. Any hint to solve it?

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GES DISC - jimacker
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Re: MERRA 2 - Windspeed V50M missing @ 50.0N/3.125E

by GES DISC - jimacker » Tue Jul 12, 2022 11:03 am America/New_York

Hello,

We are examining your issue now; we will provide a reply as soon as we have determined if the data is available.

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Re: MERRA 2 - Windspeed V50M missing @ 50.0N/3.125E

by GES DISC - jimacker » Tue Jul 12, 2022 2:41 pm America/New_York

From our DISC science support staff:

I can get V50M in the subsetted file by repeating the selections you listed, i.e.,

Dataset: MERRA-2 inst1_2d_asm_Nx: 2d,1-Hourly,Instantaneous,Single-Level,Assimilation,Single-Level Diagnostics V5.12.4
Download Method: Get File Subsets using the GES DISC Subsetter
Date Range: 2021-02-28 to 2022-05-31
Region: 2.5, 49.5, 3.75, 50.5 (Search and Crop)
Variables:
T10M = 10-meter air temperature
U50M = eastward wind at 50 meters
V50M = northward wind at 50 meters
Format: netCDF

I am not quite sure what you meant by "V50M is missing". For my case (Mac machine, Chrome), I got V50M in the files. Please see the attached NASA Panoply screenshot for the metadata and the plot of V50m on the day of 20210228 (one of the downloaded files). As a matter of fact, the selected region is quite small covering only 9 grids with lat=3 and lon=3, thus the plot might look like all missing values. However, if you check carefully the min and max of V50m on the bottom of the plot, you will see that they are not missing.

In order to better assist you, could you provide more information (e.g., machine and browser) and screenshot your results?

In case you are try to get the time series at a point location or over a small region, I would like to recommend other tools to subset and download the data, please refer to this FAQ:

* How do I obtain a time series for MERRA-2 data?
https://disc.gsfc.nasa.gov/information/faqs?keywords=MERRA-2&title=How%20do%20I%20obtain%20a%20time%20series%20for%20MERRA-2%20data%3F
MERRA2_400.inst1_2d_asm_Nx.20210308.SUB.nc.screenshot.png
MERRA2_400.inst1_2d_asm_Nx.20210308.SUB.nc.screenshot.png (378.98 KiB) Not viewed yet

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