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| Titel |
A critical look at spatial scale choices in satellite-based aerosol indirect effect studies |
| VerfasserIn |
B. S. Grandey, P. Stier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 23 ; Nr. 10, no. 23 (2010-12-03), S.11459-11470 |
| Datensatznummer |
250008933
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| Publikation (Nr.) |
 copernicus.org/acp-10-11459-2010.pdf |
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| Zusammenfassung |
| Analysing satellite datasets over large regions may introduce spurious
relationships between aerosol and cloud properties due to spatial variations
in aerosol type, cloud regime and synoptic regime climatologies. Using
MODerate resolution Imaging Spectroradiometer data, we calculate
relationships between aerosol optical depth τa derived liquid
cloud droplet effective number concentration Ne and liquid cloud
droplet effective radius re at different spatial scales. Generally,
positive values of dlnNedlnτa are found for ocean regions, whilst negative values occur for many land
regions. The spatial distribution of dlnredlnτa shows approximately the opposite pattern, with
generally postive values for land regions and negative values for ocean
regions. We find that for region sizes larger than
4° × 4°, spurious spatial variations in retrieved
cloud and aerosol properties can introduce widespread significant errors to
calculations of dlnNedlnτa and dlnredlnτa. For regions on the
scale of 60° × 60°, these methodological errors may
lead to an overestimate in global cloud albedo effect radiative forcing of
order 80% relative to that calculated for regions on the scale of 1° × 1°. |
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