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| Titel |
Components of near-surface energy balance derived from satellite soundings – Part 1: Noontime net available energy |
| VerfasserIn |
K. Mallick, A. Jarvis, G. Wohlfahrt, G. Kiely, T. Hirano, A. Miyata, S. Yamamoto, L. Hoffmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 2 ; Nr. 12, no. 2 (2015-01-23), S.433-451 |
| Datensatznummer |
250117782
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| Publikation (Nr.) |
 copernicus.org/bg-12-433-2015.pdf |
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| Zusammenfassung |
| This paper introduces a relatively simple method for recovering global
fields of monthly midday (13:30 LT) near-surface net available energy (the
sum of the sensible and latent heat flux or the difference between the net
radiation and surface heat accumulation) using satellite visible and
infrared products derived from the AIRS (Atmospheric Infrared Sounder) and
MODIS (MODerate Resolution Imaging Spectroradiometer) platforms. The method
focuses on first specifying net surface radiation by considering its various
shortwave and longwave components. This was then used in a surface energy
balance equation in conjunction with satellite day–night surface temperature
difference to derive 12 h discrete time estimates of surface system heat
capacity and heat accumulation, leading directly to retrieval for surface
net available energy. Both net radiation and net available energy estimates
were evaluated against ground truth data taken from 30 terrestrial tower
sites affiliated with the FLUXNET network covering 7 different biome classes.
This revealed a relatively good agreement between the satellite and tower
data, with a pooled root-mean-square deviation of 98 and 72 W m−2 for
monthly 13:30 LT net radiation and net available energy, respectively,
although both quantities were underestimated by approximately 25 and 10%, respectively, relative to the tower observation. Analysis of the
individual shortwave and longwave components of the net radiation revealed
the downwelling shortwave radiation to be main source of this systematic
underestimation. |
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