Daily Spectral Solar Radiation

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fjordana
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Daily Spectral Solar Radiation

by fjordana » Mon Jun 21, 2021 10:46 am America/New_York

In Simon Lighting, we are working on a project where we would need the average solar spectral ( only visual range ) on the earth for a giving date/time and location.

With this information, we will calculate the CCT during the day in this location, and will use it for controlling circadian luminaries. Based on this information, we will set luminaries to follow the solar spectrum during the day.

We have been looking for this information with no success, there are much information about the Total Irradiation on the earth, but there isn't information about its spectral composition.

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GES DISC - jimacker
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Re: Daily Spectral Solar Radiation

by GES DISC - jimacker » Mon Jun 21, 2021 3:57 pm America/New_York

Hello,

Can you use Photosynthetically Available (or Active) Radiation (PAR)? The PAR spectral range is 400-700 nanometers.

You can examine the PAR data products available in Giovanni at the link below. Some PAR products are only available for ocean regions, others are available over both land and ocean.

https://giovanni.gsfc.nasa.gov/giovanni ... eyword=PAR

Note that the PAR diffuse flux and beam flux from MERRA-2 are also available at hourly and 3-hourly temporal resolution from the GES DISC, but these data products are not in Giovanni. Please reply for further information on how to obtain these data products if they would be of use to you.

fjordana
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Re: Daily Spectral Solar Radiation

by fjordana » Wed Jun 23, 2021 4:16 am America/New_York

I've been analyzing the data available in Giovanni platform about the Photosynthetically Available Radiation (PAR), and the problem is that the values I can obtain are the "integrated" ones in W/m2, but I cannot get their spectral power distribution (SPD) through the visible range for analyzing the spectral variation during the day and estimate sun chromatic coordinates.

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Re: Daily Spectral Solar Radiation

by GES DISC - jimacker » Wed Jun 23, 2021 9:45 pm America/New_York

OK, then we do not have a data product at the GES DISC that will work for you, and you can continue to examine the POWER data products.

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Re: Daily Spectral Solar Radiation

by ASDC - bmacpher » Fri Jun 25, 2021 8:14 am America/New_York

In the new version of POWER, that is currently in beta, Total PAR will be included.

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Re: Daily Spectral Solar Radiation

by ASDC - pstackhouse » Mon Aug 02, 2021 5:01 pm America/New_York

Although PAR is included from the CERES project in the upcoming POWER web suite release, it is also integrated and NOT spectral. POWER also includes UV-A and UV-B, from CERES but these are also integrated over those wavelengths. How high of spectral resolution are you seeking?
Dr. Paul Stackhouse
NASA Langley Research Center
Hampton, VA, USA

fjordana
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Re: Daily Spectral Solar Radiation

by fjordana » Tue Aug 03, 2021 3:01 am America/New_York

As we only needed to estimate the average daily CCT during the year, with a resolution in the visible range on 5 or 10nm would be more than enough

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Re: Daily Spectral Solar Radiation

by ASDC - pstackhouse » Tue Aug 03, 2021 8:56 am America/New_York

Unfortunately, we do not have 5-10 nm spectrally resolved fluxes. Our current radiative transfer model has broader bands than that. This will require a moderate resolution radiative transfer model. Such models have been developed for the CLARREO mission but have not been applied to time histories of cloud and atmospheric properties we've collected and provide through POWER. Perhaps, review NREL's SMARTS model (https://www.nrel.gov/grid/solar-resource/smarts.html) to see if this capability could help you with your data needs.
Dr. Paul Stackhouse
NASA Langley Research Center
Hampton, VA, USA

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