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| Titel |
A constraint for ice cloud feedback over the tropical Pacific in future climate change |
| VerfasserIn |
X. L. Huang, H. W. Chuang, Y. Ming, G. L. Potter |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064484
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| Zusammenfassung |
| Tropical ice clouds and their changes in future climate remain challenging issues for global
climate modeling and projections. These issues are addressed by examining the
interannual variability of ice water path (IWP), an important property of ice cloud,
with respect to large-scale vertical velocity in observations, reanalysis and climate
model simulations, and by relating the unforced variability to the human-influenced
climate change. Here we show that a statistically significant linear relation between
interannual anomalies of IWP and 500hPa vertical velocity (Ï500) can be identified from
all data sets and, moreover, such relationship in each model is closely correlated
with its simulated IWP change with respect to Ï500 change for the future climate.
This indicates a robust constraint for the future tropical ice cloud change. Such
constraint and observed IWP-Ï500relation projectsa 12.8%-16.4% increase of IWP for
every -0.01Pa/s change of Ï500, equivalent to ~2.96%-3.80% decrease of IWP for
circulation change associated with every 1K global surface warming. Such IWP change
corresponds to ~-0.05±0.007 Wm-2 (~0.32±0.03 Wm-2) change of cloud radiative
effect at the top of atmosphere (surface) over the tropical Pacific per 1K global
warming, implying a decrease of net cloud absorption which needs to be considered for
relevant studies such as the changes of hydrological cycle and atmospheric stability. |
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