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| Titel |
Large differences in reanalyses of diabatic heating in the tropical upper troposphere and lower stratosphere |
| VerfasserIn |
J. S. Wright, S. Fueglistaler |
| 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 ; 13, no. 18 ; Nr. 13, no. 18 (2013-09-27), S.9565-9576 |
| Datensatznummer |
250085717
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| Publikation (Nr.) |
 copernicus.org/acp-13-9565-2013.pdf |
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| Zusammenfassung |
| We present the time mean heat budgets of the tropical upper troposphere (UT)
and lower stratosphere (LS) as simulated by five reanalysis models:
the Modern-Era Retrospective Analysis for Research and Applications (MERRA),
European Reanalysis (ERA-Interim), Climate Forecast System Reanalysis (CFSR),
Japanese 25-yr Reanalysis and Japan Meteorological Agency Climate Data Assimilation System (JRA-25/JCDAS),
and National Centers for Environmental Prediction/National Center for Atmospheric
Research (NCEP/NCAR) Reanalysis 1. The simulated diabatic heat
budget in the tropical UTLS differs significantly from model to model, with
substantial implications for representations of transport and mixing. Large
differences are apparent both in the net heat budget and in all comparable
individual components, including latent heating, heating due to radiative
transfer, and heating due to parameterised vertical mixing. We describe and
discuss the most pronounced differences. Discrepancies in latent heating
reflect continuing difficulties in representing moist convection in models.
Although these discrepancies may be expected, their magnitude is still
disturbing. We pay particular attention to discrepancies in radiative heating
(which may be surprising given the strength of observational constraints on
temperature and tropospheric water vapour) and discrepancies in heating due
to turbulent mixing (which have received comparatively little attention). The
largest differences in radiative heating in the tropical UTLS are
attributable to differences in cloud radiative heating, but important
systematic differences are present even in the absence of clouds. Local
maxima in heating and cooling due to parameterised turbulent mixing occur in
the vicinity of the tropical tropopause. |
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