Search found 252 matches

by GES DISC - jimacker
Fri Apr 28, 2023 2:53 pm America/New_York
Forum: Questions/Comments
Question: How to get sea salt aerosol fraction from MODIS AOD data
Replies: 3

Re: How to get sea salt aerosol fraction from MODIS AOD data

Hello. I am not sure about MODIS AOD, but the Modern-Era Retrospective Analysis for Research and Applications Version 2 (MERRA-2) has several sea salt variables that may be useful. I am providing the search link in Giovanni, but the datasets and variables can also be acquired directly from the GES D...
by GES DISC - jimacker
Thu Apr 20, 2023 2:02 pm America/New_York
Forum: Questions/Comments
Question: Photosynthetically Active Radiation Data
Replies: 5

Re: Photosynthetically Active Radiation Data

MERRA-2 PAR products are in our Giovanni system, and that provides an opportunity to make a quick analysis for a particular region such as Door County. For Door County in particular, you would have to make a bounding box, or you could do the state of Wisconsin and just look at the values visually. I...
by GES DISC - jimacker
Thu Feb 23, 2023 3:13 pm America/New_York
Forum: Questions/Comments
Question: data related to atmosphere at different altitudes
Replies: 1

Re: data related to atmosphere at different altitudes

Dear Saivun Reddy, This message was just recently viewed as you posted it at a time which included a holiday in the United States. We have data from the Atmospheric Infrared Sounder (AIRS) that includes most of the parameters you requested. The data are available at pressure levels in hPA. You can i...
by GES DISC - jimacker
Tue Feb 14, 2023 2:41 pm America/New_York
Forum: Questions/Comments
Question: aerosol data
Replies: 5

Re: aerosol data

I will check with my colleagues. To begin, I recommend this ARSET training set of videos (from a class), particularly part 3.

https://www.youtube.com/playlist?list=PLiuUQ9asub3TPlA3RZuMJ_mHLuy6W5tGe
by GES DISC - jimacker
Thu Feb 09, 2023 4:23 pm America/New_York
Forum: Questions/Comments
Question: aerosol data
Replies: 5

Re: aerosol data

Hello, Here is more information in response to your question. "I would like to suggest extracting PM2.5 from the daily AOD, and then calculate the monthly mean PM2.5. As such, the monthly PM2.5 value is more precise. When you convert AOD to PM2.5, you might need to consider the factors such as ...
by GES DISC - jimacker
Thu Feb 09, 2023 10:52 am America/New_York
Forum: Questions/Comments
Question: Looking for data set AIRS AIRICRAD with gap filled at 6 microns
Replies: 2

Re: Looking for data set AIRS AIRICRAD with gap filled at 6 microns

This suggestion is from one of our staff members familiar with AIRS data.

The SNDR12CHRP1 version 2 data collection may work. https://doi.org/10.5067/WIG2N5C20MRJ

This data collection "fills" in missing channels, though I don't know if it would fill in that much of a gap.
by GES DISC - jimacker
Thu Feb 09, 2023 10:07 am America/New_York
Forum: Questions/Comments
Question: Looking for data set AIRS AIRICRAD with gap filled at 6 microns
Replies: 2

Re: Looking for data set AIRS AIRICRAD with gap filled at 6 microns

Hello,

You may not be aware that the GES DISC has AIRS data. The search results for AIRICRAD are below. The associated documentation may assist in answering your question. Please reply if further assistance is required.

https://disc.gsfc.nasa.gov/datasets?keywords=AIRICRAD&page=1
by GES DISC - jimacker
Tue Feb 07, 2023 11:37 am America/New_York
Forum: Questions/Comments
Question: aerosol data
Replies: 5

Re: aerosol data

Hello, Could you please point us to, or describe, which specific PM2.5 and PM10 data you used or intend to use? This will assist us in answering your question. Monthly mean AOD data from MODIS and Sentinel-5P (TROPOMI) is usually calculated from daily mean data with caveats, such as only daytime dat...
by GES DISC - jimacker
Fri Feb 03, 2023 8:04 pm America/New_York
Forum: Questions/Comments
Question: Question about using wget on for Aqua and Merra2
Replies: 18

Re: Question about using wget on for Aqua and Merra2

Our staff is examining the information you provided about the MERRA-2 download and will reply, likely early next week (February 6-10).
by GES DISC - jimacker
Mon Jan 23, 2023 6:45 pm America/New_York
Forum: Questions/Comments
Question: MODIS VS VIIRS
Replies: 3

Re: MODIS VS VIIRS

Hello, I have asked one of our GES DISC staff members who is familiar with these aerosol data products. Here is their answer; note that if you can provide additional information we may be able to give you more specific information. "I need more information from this user. For example, which VII...