Data Description of DOI 10.5880/CRC1211DB.19

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Citation:Böhm, Christoph (2019): MIBase V1. CRC1211 Database (CRC1211DB). DOI: 10.5880/CRC1211DB.19
Title(s):Main Title: MIBase V1
Description(s):Abstract: The MIBase product is derived from the Multi-angle Imaging SpectroRadiometer (MISR) which is placed on the Terra satellite. The newly developed MISR cloud base height (MIBase) algorithm (Boehm et al., in review with AMT, retrieves the cloud base height from the MISR Level 2TC Cloud Product (MIL2TCSP). The MIL2TCSP product provides the cloud top height and a stereo-derived cloud mask at 1.1 km horizontal resolution. The MIBase algorithm evaluates the ensemble of the cloud top height retrievals within a specified area or grid box in case some cloud gaps occur within the area and a sufficient amount of cloud top height retrievals marked high confidence cloud according to the stereo-derived cloud mask is provided. The 15th percentile of the cloud top height distribution within the specified grid box yields the cloud base height. The final product is produced globally on a 0.25x0.25 degree longitude latitude grid for a three year period (2007-2009). The algorithm has been calibrated and validated against ground-based ceilometer measurements across the continental USA over the course of two years. An important strength of MIBase is the geometric approach which is applied to create the cloud top height product from MISR measurements. Neither a calibration nor auxiliary data are necessary to obtain the cloud top height product which is the starting point for the MIBase algorithm. In consequence, retrievals are possible over all kinds of terrain even above ice. A disadvantage is the threshold height which MISR requires to create the stereo-derived cloud mask. Therefore, depending on the terrain variability in the vicinity of the measurement, MIBase is not capable of deriving cloud base heights below at least 560 m (flat terrain). The algorithm requires a broken cloud scene. For complete overcast within the chosen MIBase cell, the cloud base height cannot be retrieved. Therefore, climatologies derived from this algorithm would be biased towards cloud types for which MISR is able to observe the surface through cloud gaps. The given cloud base height estimates represent the situation during morning hours since MISR is carried on board the Terra satellite in a Sun-synchronous orbit with an equatorial overpass time at around 10:30 local solar time.
Funding(s):Deutsche Forschungsgemeinschaft/Earth - Evolution at the Dry Limit, CRC 1211
Subject(s):CRC1211 Keywords: Meteorology, Remote Sensing
ISO Topic Category: ClimatologyMeteorologyAtmosphere
Date(s):Created: 2019-02-08
Related Identifier(s):Is Described By: DOI: 10.5194/amt-2018-317
Is Derived From: DOI: 10.5067/Terra/MISR/MIL2TCSP_L2.001, related data type: Dataset
Resource Type:Dataset
North:-no map data
Measurement Region:Other
Measurement Location:--Other--
Contact:Christoph Böhm

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