Searched for: author:"De Haan, Johan F."
(1 - 5 of 5)
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Chimot, J.J. (author), Veefkind, j. Pepijn (author), De Haan, Johan F. (author), Stammes, Piet (author), Levelt, Pieternel Felicitas (author)
Global mapping of satellite tropospheric NO<sub>2</sub> vertical column density (VCD), a key gas in air quality monitoring, requires accurate retrievals over complex urban and industrialized areas and under any atmospheric conditions. The high abundance of aerosol particles in regions dominated by anthropogenic fossil fuel combustion, e.g....
journal article 2019
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Nanda, S. (author), Veefkind, j. Pepijn (author), De Graaf, Martin (author), Sneep, Maarten (author), Stammes, Piet (author), De Haan, Johan F. (author), Sanders, Abram F.J. (author), Apituley, Arnoud (author), Tuinder, Olaf (author), Levelt, Pieternel Felicitas (author)
This paper presents a weighted least squares approach to retrieve aerosol layer height from top-of-atmosphere reflectance measurements in the oxygen A band (758-770g nm) over bright surfaces. A property of the measurement error covariance matrix is discussed, due to which photons travelling from the surface are given a higher preference over...
journal article 2018
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Nanda, S. (author), De Graaf, Martin (author), Sneep, Maarten (author), De Haan, Johan F. (author), Stammes, Piet (author), Sanders, Abram F.J. (author), Tuinder, Olaf (author), Veefkind, j. Pepijn (author), Levelt, Pieternel Felicitas (author)
Retrieving aerosol optical thickness and aerosol layer height over a bright surface from measured top-of-atmosphere reflectance spectrum in the oxygen A band is known to be challenging, often resulting in large errors. In certain atmospheric conditions and viewing geometries, a loss of sensitivity to aerosol optical thickness has been...
journal article 2018
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Chimot, J.J. (author), Veefkind, J.P. (author), Vlemmix, T. (author), De Haan, Johan F. (author), Amiridis, Vassilis (author), Proestakis, Emmanouil (author), Marinou, Eleni (author), Levelt, P.F. (author)
This paper presents an exploratory study on the aerosol layer height (ALH) retrieval from the OMI 477nm O<sub>2</sub> O<sub>2</sub> spectral band. We have developed algorithms based on the multilayer perceptron (MLP) neural network (NN) approach and applied them to 3-year (2005-2007) OMI cloud-free scenes over north-east Asia, collocated with...
journal article 2017
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Veefkind, j. Pepijn (author), De Haan, Johan F. (author), Sneep, Maarten (author), Levelt, Pieternel Felicitas (author)
The OMI (Ozone Monitoring Instrument on board NASA's Earth Observing System (EOS) Aura satellite) OMCLDO2 cloud product supports trace gas retrievals of for example ozone and nitrogen dioxide. The OMCLDO2 algorithm derives the effective cloud fraction and effective cloud pressure using a DOAS (differential optical absorption spectroscopy) fit...
journal article 2016
Searched for: author:"De Haan, Johan F."
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