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It appears that you are looking at a file from the Ocean Biology Distributed Active Archive Center (OBDAAC). What tool/software are you using to examine the data? Further replies will likely be from an OBDAAC staff member - I'm asking that question to help them out in answering your query.

Hello,

Sorry for additional questions, but what is the name of the data variable you are examining?

I/we are just attempting to determine which data center should address your question.

Hello,

What data are you working with, or alternatively, what data center is this question directed to?

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...