MODIS comparisons with northeastern Pacific in situ stratocumulus microphysics

Vertical sounding measurements within stratocumuli during two aircraft field campaigns, Marine Stratus/stratocumulus Experiment (MASE) and Physics of Stratocumulus Top (POST), are used to validate Moderate Resolution Imaging Spectroradiometer (MODIS) cloud optical thickness (COT), cloud liquid water...

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Veröffentlicht in:Journal of geophysical research. Atmospheres : JGR. - 1998. - 120(2015), 16 vom: 27. Aug., Seite 8332-8344
1. Verfasser: Noble, Stephen R (VerfasserIn)
Weitere Verfasser: Hudson, James G
Format: Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Journal of geophysical research. Atmospheres : JGR
Schlagworte:Journal Article cloud liquid water path cloud microphysics northeastern Pacific stratocumulus remote sensing validation stratocumulus effective radius stratocumulus optical depth
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520 |a Vertical sounding measurements within stratocumuli during two aircraft field campaigns, Marine Stratus/stratocumulus Experiment (MASE) and Physics of Stratocumulus Top (POST), are used to validate Moderate Resolution Imaging Spectroradiometer (MODIS) cloud optical thickness (COT), cloud liquid water path (LWP), and cloud effective radius (re). In situ COT, LWP, and re were calculated using 5 m vertically averaged droplet probe measurements of complete vertical cloud penetrations. MODIS COT, LWP, and re 1 km pixels were averaged along these penetrations. COT comparisons in POST showed strong correlations and a near 1:1 relationship. In MASE, comparisons showed strong correlations; however, MODIS COT exceeded in situ COT, likely due to larger temporal differences between MODIS and in situ measurements. LWP comparisons between two cloud probes show good agreement for POST but not MASE, giving confidence to POST data. Both projects provided strong LWP correlations but MODIS exceeded in situ by 14-36%. MODIS in situ re correlations were strong, but MODIS 2.1 µm re exceeded in situ re, which contributed to LWP bias; in POST, MODIS re was 20-30% greater than in situ re. Maximum in situ re near cloud top showed comparisons nearer 1:1. Other MODIS re bands (3.7 µm and 1.6 µm) showed similar comparisons. Temporal differences between MODIS and in situ measurements, airplane speed differences, and cloud probe artifacts were likely causes of weaker MASE correlations. POST COT comparison was best for temporal differences under 20 min. POST data validate MODIS COT but it also implies a positive MODIS re bias that propagates to LWP while still capturing variability 
650 4 |a Journal Article 
650 4 |a cloud liquid water path 
650 4 |a cloud microphysics 
650 4 |a northeastern Pacific stratocumulus 
650 4 |a remote sensing validation 
650 4 |a stratocumulus effective radius 
650 4 |a stratocumulus optical depth 
700 1 |a Hudson, James G  |e verfasserin  |4 aut 
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