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

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http://hdl.handle.net/10138/167035

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Sporre , M K , O'Connor , E J , Håkansson , N , Thoss , A , Swietlicki , E & Petäjä , T 2016 , ' Comparison of MODIS and VIIRS cloud properties with ARM ground-based observations over Finland ' , Atmospheric Measurement Techniques , vol. 9 , no. 7 , pp. 3193-3203 . https://doi.org/10.5194/amt-9-3193-2016

Title: Comparison of MODIS and VIIRS cloud properties with ARM ground-based observations over Finland
Author: Sporre, Moa K.; O'Connor, Ewan J.; Håkansson, Nina; Thoss, Anke; Swietlicki, Erik; Petäjä, Tuukka
Contributor: University of Helsinki, Department of Physics
Date: 2016
Language: eng
Number of pages: 11
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
URI: http://hdl.handle.net/10138/167035
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 Hyytiala, 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 (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 m(-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.
Subject: WATER PATH
RETRIEVALS
ABSORPTION
SATELLITE
RADIATION
SURFACE
CIRRUS
ANGLE
114 Physical sciences
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