2. MAX-DOAS network and satellite observations

We developed light-weighted MAX-DOAS instrument, which observes UV/vis spectra of scattered sunlight at selected elevation angles from ground/ship to retrieve vertical profiles/column amount of NO2, HCHO, and aerosols. The instruments are distributed to form a Japan/Korea/China/Russia monitoring network, and on research vessels. More detailed information and numerical data are available in another page (link). The unique, large data set from 2007 till now is used to validate satellite observations, such as OMI. Our findings are that satellite-based Tropospheric NO2 column density has low bias when aerosols are perturbing the radiative transfer and when NO2 is populated near the ground surface. We also propose new space-based observations from International Space Station (ISS), at a dramatically improved spatial resolution, down to 1 x 1 km, to enable "single-source" identification and to study non-linear ozone photochemistry.

More information

  • press release, August 2014
  • Kanaya, Y. et al. (2014), Long-term MAX-DOAS network observations of NO2 in Russia and Asia (MADRAS) during 2007–2012: instrumentation, elucidation of climatology, and comparisons with OMI satellite observations and global model simulations, Atmos. Chem. Phys., 14, 7909-7927.
  • Irie, H. et al. (2008), First retrieval of tropospheric aerosol profiles using MAX-DOAS and comparison with lidar and sky radiometer measurements, Atmos. Chem. Phys., 8, 341-350.
  • Takashima, H. et al. (2009): Atmospheric aerosol variations at Okinawa Island in Japan observed by MAX-DOAS using a new cloud-screening method, J. Geophys. Res., 114, D18213