Search found 120 matches

by GES DISC - jimacker
Mon May 10, 2021 5:54 pm America/New_York
Forum: All Questions/Comments
Question: Aerosol type from satellite data
Replies: 2

Re: Aerosol type from satellite data

I am not familiar with the data variables in the MYD04_L2 data product. For your second question, MERRA-2 has a Black Carbon data variable and several dust aerosol data variables. OMI and TROPOMI have aerosol absorption variables for absorbing aerosols. Giovanni can provide a quick indicator even if...
by GES DISC - jimacker
Mon May 10, 2021 5:47 pm America/New_York
Forum: All Questions/Comments
Question: Water vapour, ozone and aerosol data from MERRA-2 datasets
Replies: 6

Re: Water vapour, ozone and aerosol data from MERRA-2 datasets

Hello, Here is a partial answer, with links to resources that can provide more information. First of all, it would be helpful to provide more information on how you wish to use the data. We would like encourage you to read MERRA-2 File Specification ( https://gmao.gsfc.nasa.gov/pubs/docs/Bosilovich7...
by GES DISC - jimacker
Fri May 07, 2021 9:18 pm America/New_York
Forum: All Questions/Comments
Question: Water vapour, ozone and aerosol data from MERRA-2 datasets
Replies: 6

Re: Water vapour, ozone and aerosol data from MERRA-2 datasets

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.
by GES DISC - jimacker
Thu May 06, 2021 4:31 pm America/New_York
Forum: All Questions/Comments
Question: MODIS Aqua SST and Chl-a Product
Replies: 2

Re: MODIS Aqua SST and Chl-a Product

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/
by GES DISC - jimacker
Thu May 06, 2021 4:18 pm America/New_York
Forum: All Questions/Comments
Question: Satellite and airborne atmosphere and aerosol data
Replies: 2

Re: Satellite and airborne atmosphere and aerosol data

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...
by GES DISC - jimacker
Thu May 06, 2021 3:36 pm America/New_York
Forum: All Questions/Comments
Question: Water vapour, ozone and aerosol data from MERRA-2 datasets
Replies: 6

Re: Water vapour, ozone and aerosol data from MERRA-2 datasets

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...
by GES DISC - jimacker
Mon May 03, 2021 3:48 pm America/New_York
Forum: All Questions/Comments
Question: Release announcement for Giovanni Version 4.35
Replies: 0

Release announcement for Giovanni Version 4.35

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...
by GES DISC - jimacker
Mon May 03, 2021 3:36 pm America/New_York
Forum: All Questions/Comments
Question: chlorophyll a in the Southern Ocean
Replies: 1

Re: chlorophyll a in the Southern Ocean

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...
by GES DISC - jimacker
Fri Apr 16, 2021 3:54 pm America/New_York
Forum: All Questions/Comments
Question: Soil porosity
Replies: 3

Re: Soil porosity

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 ...
by GES DISC - jimacker
Wed Apr 14, 2021 3:38 pm America/New_York
Forum: All Questions/Comments
Question: UUI subsetting "datasetID" - how to find?
Replies: 4

Re: UUI subsetting "datasetID" - how to find?

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; ...