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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-348
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-348
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Oct 2019

Submitted as: research article | 14 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Validating TROPOMI aerosol layer height retrievals with CALIOP data

Swadhin Nanda2, Martin de Graaf1, J. Pepijn Veefkind1,2, Maarten Sneep1, Mark ter Linden1,3, Jiyunting Sun1,2, and Pieternel F. Levelt1,2 Swadhin Nanda et al.
  • 1Royal Netherlands Meteorological Institute (KNMI), Utrechtseweg 297, 3731 GA De Bilt, The Netherlands
  • 2Delft university of Technology (TU Delft), Mekelweg 2, 2628 CD Delft, The Netherlands
  • 3S&T Corp, Delft, The Netherlands

Abstract. The Tropospheric Monitoring Instrument's (TROPOMI) level-2 aerosol layer height (ALH) product has now been released to the general public. This product is retrieved using TROPOMI's measurements of the oxygen A-band, radiative transfer model (RTM) calculations augmented by neural networks and an iterative optimal estimation technique. The TROPOMI ALH product will deliver aerosol layer height estimates over cloud-free scenes over the ocean and land that contain aerosols above a certain threshold of the measured UV absorbing index (UVAI) in the ultraviolet region. This paper provides background for the ALH product and explores its quality by comparing ALH estimates to similar quantities derived from spaceborne lidars observing the same scene. The spaceborne lidar chosen for this study is the Cloud-Aerosol Lidar with Orthogonal Polarisation (CALIOP) on board the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission, which flies in formation with NASA's A-train constellation since 2006 and is a proven source of data for studying aerosol layer heights. The influence of the surface and clouds are discussed and the aspects of the TROPOMI ALH algorithm that will require future development efforts are highlighted.

Swadhin Nanda et al.
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Short summary
This paper discusses the validation of the TROPOspheric Monitoring Instrument (TROPOMI) aerosol layer height product, which is an estimate of the height of an aerosol layer using a spectrometer on board ESA's Sentinel-5 Precursor satellite mission. This study looks at a collection of colocations between TROPOMI and satellite instrument Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) on board NASA's Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) mission.
This paper discusses the validation of the TROPOspheric Monitoring Instrument (TROPOMI) aerosol...
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