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| Titel |
Evaluation of ECHAM5-HAM simulated Surface, TOA and Atmospheric Radiation Budgets using Global CERES-BSRN Observations |
| VerfasserIn |
Xiquan Dong, Baike Xi, Martin Wild, Doris Folini, Minnis Minnis, Norman Loeb |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034034
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| Zusammenfassung |
| Atmospheric column absorption of solar radiation (Acol) is a fundamental part of the Earth’s
energy cycle but is an extremely difficult quantity to measure directly. To investigate Acol, we
have collocated satellite-surface observations over the 35 selected BSRN surface sites during
the period March 2000-December 2004. The surface radiation budgets are averaged from the
BSRN Shortwave (SW) observations over a 1-hour interval centered at the time of the NASA
Terra and Aqua satellites overpass, and the TOA radiation budgets are averaged from the
closest FOV satellite data to the BSRN stations. Then the atmospheric column SW
absorption was inferred from the satellite TOA albedo and BSRN surface absorption.
Monthly means of Acol, TOA albedo, and surface absorption are calculated under both
clear- and all-sky conditions over the 35 selected BSRN sites which have covered
different climate regimes. To evaluate the GCM simulations, we have collected
the ECHAM5-HAM simulated surface, TOA and atmospheric radiation budgets
by researchers at ETH Zurich and compared those simulations with observations.
The preliminary comparisons have shown that the ECHAN5 simulated clear-sky
surface absorption, TOA albedo, and Acol agree very well (1-3%) with observations.
Under all-sky conditions, they have strong correlations with CERES-derived cloud
fraction. The simulated surface absorption is lower and TOA albedo is higher than
those under clear skies, but ACOL does not increase too much. However, there are
relatively large differences over some regions and months. A further study is needed. |
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