Comparison of MODIS and VIIRS cloud properties with ARM ground-based observations over Finland

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Abstract

Cloud retrievals from the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments aboard the satellites Terra and Aqua and the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard the Suomi-NPP satellite are evaluated using a combination of ground-based instruments providing vertical profiles of clouds. The ground-based measurements are obtained from the Atmospheric Radiation Measurement (ARM) programme mobile facility, which was deployed in Hyytiälä, Finland, between February and September 2014 for the Biogenic Aerosols-Effects on Clouds and Climate (BAECC) campaign. The satellite cloud parameters cloud top height (CTH) and liquid water path (LWP) are compared with ground-based CTH obtained from a cloud mask created using lidar and radar data and LWP acquired from a multi-channel microwave radiometer. Clouds from all altitudes in the atmosphere are investigated. The clouds are diagnosed as single or multiple layer using the ground-based cloud mask. For single-layer clouds, satellites overestimated CTH by 326 m (14 %) on average. When including multilayer clouds, satellites underestimated CTH by on average 169 m (5.8 %). MODIS collection 6 overestimated LWP by on average 13 g mg-2 (11 %). Interestingly, LWP for MODIS collection 5.1 is slightly overestimated by Aqua (4.56 %) but is underestimated by Terra (14.3 %). This underestimation may be attributed to a known issue with a drift in the reflectance bands of the MODIS instrument on Terra. This evaluation indicates that the satellite cloud parameters selected show reasonable agreement with their ground-based counterparts over Finland, with minimal influence from the large solar zenith angle experienced by the satellites in this high-latitude location.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Helsinki
  • University of Reading
  • Finnish Meteorological Institute
  • Swedish Meteorological and Hydrological Institute
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Meteorologi och atmosfärforskning
Originalspråkengelska
Sidor (från-till)3193-3203
Antal sidor11
TidskriftAtmospheric Measurement Techniques
Volym9
Utgåva nummer7
StatusPublished - 2016 jul 21
PublikationskategoriForskning
Peer review utfördJa