I noticed that there is no https://oceandata.sci.gsfc.nasa.gov/ob/getfile/TERRA_MODIS.20200311.L3m.DAY.SST.sst.4km.nc (compare with the existing https://oceandata.sci.gsfc.nasa.gov/ob/getfile/TERRA_MODIS.20200310.L3m.DAY.SST.sst.4km.nc)
I'm trying to use CMR to list the available files, but can't figure out the concept id for these SST files - none of the entries mentioning Terra SST generate the right files: https://cmr.earthdata.nasa.gov/search/collections.xml?page_size=2000&provider=OB_DAAC
We see SST files for 20200310, but now there is no SST for 20200331. Worse, if I look at CMR, there are no files for any of the concepts we care about at all starting from Mar 15 (even though your site has the files):
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That way you'll know which are NRT and which are not without having to cross reference any arbitrary ID defined by the CMR system when we added the "collection".
There are no data starting on Mar 15 if I use the link in you format as well: https://cmr.earthdata.nasa.gov/search/granules.json?&page_size=200&sort_key=short_name&sort_key=start_date&short_name=MODIST_L3m_CHL&provider=OB_DAAC&temporal=2020-03-15,2020-05-13
I think I like using the concept ids slightly more (for consistency with other NASA datasets and because they are more narrow). Though for the oceancolor datasets I have to filter the search results anyway (eg, to only keep 4km files), so either approach is ok.
The refined-ancillary versions of the Ocean Color data should be available out to April 25th. I'll look at EarthData search and see why they are not showing up.