modis r2022 par data problem

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rtomalley
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modis r2022 par data problem

by rtomalley » Fri Aug 19, 2022 3:35 pm America/New_York

Hi there,
Just noticed that the 8day, 9km par data has a recurring swath of missing data in the north pacific. Extreme case can be seen in 2003 for the 8day file starting on day 041, which gives the southern most extent of the missing data. It repeats on other years. You can see this if you look at the level-3 browser plots for the 8day, 9km par data for aqua modis. For comparison, the chlor_a data coverage for the same 8day period looks good.
Hope this one's an easy one.
Robert

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OB.DAAC - SeanBailey
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Re: modis r2022 par data problem

by OB.DAAC - SeanBailey » Mon Aug 22, 2022 4:11 pm America/New_York

Robert,
:shock:
OK, that is definitely a problem - and seems to be related to the sea ice flagging, which is why it only shows up in PAR in the high latitudes (PAR masks on SEAICE at L2 - no other algorithm does so). Now that we know a) there is a problem and b) what the source of said problem is, we should be able to correct it relatively quickly.

Stay tuned...

Sean

tobyw
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Re: modis r2022 par data problem

by tobyw » Mon Aug 22, 2022 5:51 pm America/New_York

There is also some weird striping, which may be a different problem? Easily seen flipping through the L3 Browser ...

Sorry to pile on :?

Thanks,
Toby

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Re: modis r2022 par data problem

by OB.DAAC - SeanBailey » Tue Aug 23, 2022 9:17 am America/New_York

The striping and the lack of data are the same problem.

Sean

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Re: modis r2022 par data problem

by OB.DAAC - SeanBailey » Tue Sep 13, 2022 7:10 am America/New_York

The issue with the seaice flagging has been resolved and the PAR product has been reprocessed.

Regards,
Sean

rtomalley
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Re: modis r2022 par data problem

by rtomalley » Tue Sep 13, 2022 1:48 pm America/New_York

roger that. Thanks for the word

Robert

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