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| Titel |
Long-term trends and interannual variability of water vapor over the tropics in reanalyses, CMIP5 models and observations |
| VerfasserIn |
Hiroshi G. Takahashi |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109266
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| Publikation (Nr.) |
 EGU/EGU2015-9159.pdf |
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| Zusammenfassung |
| The strength of the hydrological cycle in the atmosphere and its long-term changes are of
considerable interest, especially as the climate changes. The hydrological cycle in the
atmosphere is summarized as evaporation of moisture from the earth surface (land and ocean)
and precipitation into the earth surface. The global warming can modulate the strength of
hydrological cycle. Many previous studies have investigated the long-term changes in
precipitation. However, the investigation of the long-term changes in water vapor has been
limited. We investigated the changes and interannual variability in water vapor in
the atmosphere of the global scale using multiple reanalyses, CMIP5 models and
observations.
In reanalyses, the long-term changes in surface air temperature and PW over the tropical
ocean were out of range of some observations. Both long-term changes in surface air
temperature and PW may have problems. There may be no common systematic bias. The
observation shows PW over ocean probably increases for recent two decades. However, the
trend in PW was reduced. The reduction of the trend is associated with the hiatus of global
warming after 2000’s. The relationship between surface air temperature and PW
was not fitted to CC relationship on the long-term trend. The long-term changes in
surface air temperature and PW in the CMIP5 models are basically fitted to the CC
relationship (Global mean values of water vapor were approximately 6.5-7.5% per
K). |
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