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We'll check with our MERRA-2 data scientists at the GES DISC and also contact the MERRA-2 scientists to find out if we can provide some guidance for you on this question.

Giovanni receives the standard MODIS-Aqua chlorophyll-a (chlor_a) data product from the OBDAAC. The algorithm is described here:

https://oceancolor.gsfc.nasa.gov/atbd/chlor_a/

Mengmeng, For aerosol optical depth, because it is a cumulative measure of light absorption / scattering in the atmosphere, there is not a value at a specific altitude. For water vapor, the Atmospheric Infrared Sounder (AIRS) provides data at specific pressure levels (hPA); these pressure levels can...

Mengmeng, Thank you for your query. Unfortunately, what you are seeking is not clear from the way your question is phrased. Do you want instructions on how to acquire these variables from our system for specific dates and locations? Or are you trying to compare these MERRA-2 variables to data variab...

Giovanni Version 4.35 has just been released at the Goddard Earth Sciences Data and Information Services Center (GES DISC). The new release provides new video (movie) and Animated GIF download options for the Animation visualization service, and 24 regional shapefiles which provide better map depict...

The Giovanni system, https://giovanni.gsfc.nasa.gov/ , provides a simple data access method for MODIS-Aqua chlorophyll data, including the period of your interest. Are you just seeking the average chlorophyll for the Southern Ocean south of 55 S, or do you wish to see data for specific regions? Eith...

This answer was provided by a GLDAS subject matter expert at Goddard Space Flight Center. The Global Land Data Assimilation System (GLDAS) does not use different parameters for “deep” (2-150cm) soil porosity. It only uses the one porosity map for all layers, shown on the LDAS website with an image ...

Hello, Here is the answer provided by our GES DISC staff. There are two ways to get the DatasetId. 1. The search API (https://disc.gsfc.nasa.gov/information/howto?keywords=api&title=How%20to%20Use%20the%20Web%20Services%20API%20for%20Dataset%20Searching) does provide a way to get the DatasetID; ...

Thanks for your question. I will forward it to our developers for comment.

"Binned" simply refers to the collection of valid observations. With 1 km (at nadir) resolution, a "bin" will be each 4x4 km region on the Level 3 data grid. Any valid 1 km pixel observation during the time period (8-day, monthly) will be added to the appropriate bin. At the end ...