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1) Satellite measurements are averages taken from a 5×5 pixel box centered around the location of the in situ measurement. You can find more details here: https://seabass.gsfc.nasa.gov/wiki/validation_description 2) For PIC, you can refer to the ATBD and the corresponding references for details: htt...

Adding to Chris's reply, there are several different sets of pure water absorption coefficients from lab measurements. It appears the authors didn’t cite the corresponding article in that publication. The best way to obtain the exact same data is by contacting the authors. However, the coefficients ...

Hello,

I believe the PODAAC team can provide a thorough answer to your question. Please replace #OBDAAC with #PODAAC.

Thank you!

Sun glint during the summer months is another reason for the missing data in MODIS products over the Arabian Sea.

You can also download the MODIS monthly Chla from L3/4 browser, or try the methods described here: https://oceancolor.gsfc.nasa.gov/data/download_methods/

Let us know if you find these helpful.
Guoqing

Hello,

You can download multiple files using the methods described on this webpage: Data Search and Download Methods.

Please try these methods and let us know if you find them helpful.

Thank you.
Guoqing

Hello,

Do you have access to other ocean color webpages? If not, please send a note to:

connection_problems@oceancolor.sci.gsfc.nasa.gov

And indicate the IP address(es).

Thank you.
Guoqing

They are global algorithms, based on similar assumptions, and use the blue-green band ratios. Chlorophyll algorithm is a little complicated with the blend of a band difference and band ratio algorithms.

Hello, if you downloaded the data from oceancolor website, to better help with this question, can you share one of the file's name you have got? This will help us identify which level (L2 or L3) and what format of data you are using.

You can find the information on the following ATBD and the corresponding reference:
https://www.earthdata.nasa.gov/apt/documents/chlor-a/v1.0#doc-header