Forum

I'm glad you are able to access Giovanni.

When you can, please inform me if this will help with your research efforts.

I'm glad you are able to access Giovanni.

When you can, please inform me if this will help with your research efforts.

Further information: GLDAS only has windspeed, not direction. This URL selects the GLDAS windspeed variables (different temporal resolutions). https://giovanni.gsfc.nasa.gov/giovanni/#service=TmAvMp&starttime=&endtime=&variableFacets=dataFieldMeasurement%3AWind%3BdataProductPlatformInstr...

Chloe, I would recommend using our Giovanni system, https://giovanni.gsfc.nasa.gov/ . It provides windspeed and wind direction data from both the Global Land Data Assimilation System (GLDAS) and the Modern-Era Retrospective analysis for Research and Applications Version 2 (MERRA-2). Giovanni is not ...

From our MERRA-2 staff: you may have seen this, but this also confirms the conversion factor. Here is the related information about converting the surface PM2.5 units from kg/m3 to micro-grams/m3 PM2.5 = (DUSMASS25 + OCSMASS+ BCSMASS + SSSMASS25 + SO4SMASS*1.375) *1.e9 # To convert MERRA-2 aerosol o...

Hello. In answer to your first question, this is a simple units conversion, so the multiplication factor would be generally applicable. I am not an atmospheric scientist, but I expect that the use of μg / m^3 is much more common, both because the numbers are easy to comprehend and because of the act...

I apologize for the delay in this reply, as we have considered various causes of negative values in the data retrieval. Assuming the negative values aren't coming from fill values, they are not that uncommon, and can arise for a number of reasons. E.g. the atmosphere modelled is not a good represent...

Hello, We will have our MERRA-2 staff examine your question; however, you appear to be doing the calculation correctly. The conversion for kg to μg (micrograms) is 10^9. So, multiplying your value (rounded) of 4.6e-8 kg / m^3 by 10^9 gives a value of 45, which is in the range you were expecting. The...

Hello,

What type of data are you seeking regarding the mangroves?

That's very strange. When I click on the link, it provides a pop-up asking for permission to go to an external site, then when I say OK, it goes to Giovanni. Perhaps you have a pop-up blocker that is interfering with the pop-up? You can copy https://giovanni.gsfc.nasa.gov into your browser search wi...