Surface downward PAR/SWR/UV radiance
using MODIS direct-recieving data by AIT/IIS Tokyo-Univ
developed by H. Murakami JAXA/EORC 9 June 2010

Introduction:

Estimation of Photosynthetically available radiation (PAR) is an essential parameter to estimate the primary production. We expanded the SeaWiFS PAR algorithm (Frouin et al., 2003) to Terra and Aqua MODIS, and also over the land. Using TOMS/OMI ozone, aerosol and cloud properties retrieved simultaneously, we calculated shortwave radiation (SWR) and UV radiance which can be validated using many ground (the land and ocean) sites, such as AERONET, CEOP, and TAO/TRITON, BSRN, WOUDC, and so on. The more than ten years time series of the satellite PAR and SWR showed good agreement with in-situ observations within about 10-15% (8 days) and 8-12% (monthly) accuracy.
This dataset is one of the JASMES datasets and results from a cooperative research conducted by JAXA and NIES.
MODIS data used in this research was received at Bangkok receiving station with the collaboration work between Institute of Industrial Science, University of Tokyo (IIS/UT) and GeoInformatics Center, Asian Institute of Technology (GIC/AIT).

  see 2002-2006 animation of monthly PAR

How to get data:

  ftp://suzaku.eorc.jaxa.jp/pub/GLI/glical/Thai_1km/

 - daily/YYYY/
   - daily PAR [Ein/m^2/day] (direct+diffuse solar irradiance in 400nm-700nm)
   - daily direct PAR [Ein/m^2/day] (component of direct transmission)
   - daily mean shortwave radiation [W/m^2] (solar irradiance in 250nm-2500nm)
   - transmittance of instantaneous PAR at noon
   - daily mean UVA [W/m^2] (solar irradiance in 315nm-400nm)
   - daily mean UVB [W/m^2] (solar irradiance in 280nm-315nm)

 - monthly/YYYY/
   - monthly average of direct PAR
   - monthly average of daily PAR [Ein/m^2/day]
   - monthly average of shortwave radiation [W/m^2]
   - monthly average of transmittance of instantaneous PAR at noon
   - monthly average of UVA [W/m^2]
   - monthly average of UVB [W/m^2]

 - sample_image/
   - JPG image of monthly PAR (MDS*_PAR_le)

Data format:

See readme

Way of Acknowledgement:

Please Acknowledge as following when you write a paper.

「本研究で使用したMODISデータは，東京大学生産技術研究所(IIS/UT)とアジア工科大学院 空間情報センター(GIC/AIT)が共同運営によって受信されたものです。PAR（及び日射等）のデータはJAXAと国立環境研究所の共同研究において開発されたものです。」

"MODIS data provided in this research is received at Bangkok receiving station with the collaboration work between Institute of Industrial Science, University of Tokyo (IIS/UT) and GeoInformatics Center, Asian Institute of Technology (GIC/AIT). The PAR and radiation data is developed in the collaboration study between JAXA and National Institute for Environmental Studies (NIES)."

Reference paper:

- Algorithm and Validation paper: Now preparing
- Original algorithm (Ocean):
  R. Frouin, H. Murakami, Estimating photosynthetically available radiation at the ocean sruface from ADEOS-II global imager data, J. Oceanography, 63, 493-503, 2007.
- Application and short description about algorithm:
  N. Saigusa, K. Ichii, H. Murakami, R. Hirata, J. Asanuma, H. Den, S.-J. Han, R. Ide, S.-G. Li, T. Ohta, T.Sasai, S.-Q.Wang, G.-R. Yu, Impact of meteorological anomalies in the 2003 summer on gross primary Productivity in East Asia, Biogeosciences, Vol 7,641-655, 2010.

Also, we would appreciate receiving a preprint and/or reprint of those publications utilizing the data for inclusion in the JAXA/GCOM bibliography. These publications should be sent to: 
  The EORC GCOM Office
  Earth Observation Research Center (EORC)
  Japan Aerospace Exploration Agency (JAXA)
  Tsukuba space center E-2,
  2-1-1, Sengen, Tsukuba, Ibaraki 305-8505, Japan

Please contact us for any comments, problems or questions at e-mail address:
glisci(at-mark)jaxa.jp

Related links:

1) WebMODIS by Institute of Industrial Science, University of Tokyo, Japan
//webmodis.iis.u-tokyo.ac.jp/index.php

2) The National Institute for Environmental Studies (NIES)
//www.nies.go.jp/index.html

3) JAXA Satellite Monitoring for Environmental Studies (JAXA/EORC/JASMES)
//kuroshio.eorc.jaxa.jp/JASMES/index.html