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| Titel |
A new way to Estimate the Earth's Radiation Budget at the top-of-atmosphere |
| VerfasserIn |
Ping Zhu, Ozgur Karatekin, Michel van Ruymbeke, Steven Dewitte, Mustapha Meftah |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089202
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| Publikation (Nr.) |
 EGU/EGU2014-3398.pdf |
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| Zusammenfassung |
| The Earth’s Radiation Budget at the top-of-atmosphere (TOA) is investigated by combining
remote sensing data from different Earth observing satellites and the solar radiation
monitoring from dedicated missions. Despite the relatively high precision of each individual
instruments, the uncertainties in the current net radiation derived at the TOA is still too large
to track small energy imbalance associated with forced climate change. A new method to
estimate the net energy balance at the TOA is introduced based on nearly three years
space experiments from the Bolometric Oscillation Sensor (BOS) onboard PICARD
satellite.
PICARD satellite is circling the Earth on a heliocentric orbit, the descending and the
ascending nodes of the PICARD are around 6 a.m. and 6 p.m. local time, respectively. The
BOS sensor onboard PICARD satellite is sensitive to the radiation coming from both the sun
and the Earth. Besides solar shortwave electromagnetic radiation, the black-coated
BOS sensor measures also the reflected (visible) and reemitted (infrared) terrestrial
radiation.
The net radiation of the Earth is described as:
fnet = fin - (fvis +fir)
(1)
Where fnet, the net radiation of the Earth at the TOA, fin, the incoming solar
irradiance, fvis, the reflected solar radiation at the TOA, fir infrared radiation of the
Earth.
The energy absorbed by the main detector of the BOS can be approximately written
as:
fbos = fsun + (fvis + fir)
(2)
Where fbos, the measurements of the BOS instruments, fvis, the reflected solar radiation at
the TOA, fir infrared radiation of the Earth. Frome equation (1) and (2), we can found a new
method to estimate the net radiation:
fnet = fsun +fin - fbos
(3)
BOS/PICARD experiment allows us to employ this new approach to study the Earth’s
Radiation Budget from a single remote sensing instrument. Here we discuss the BOS data
between July 2010 and October 2013 and their implication on Earth’s Radiation Budget
estimate. |
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