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| Titel |
Role of the hydrological cycle in regulating the planetary climate system of a simple nonlinear dynamical model |
| VerfasserIn |
K. M. Nordstrom, V. K. Gupta, T. N. Chase |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 12, no. 5 ; Nr. 12, no. 5 (2005-07-29), S.741-753 |
| Datensatznummer |
250010781
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| Publikation (Nr.) |
 copernicus.org/npg-12-741-2005.pdf |
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| Zusammenfassung |
| We present the construction of a dynamic area fraction model (DAFM),
representing a new class of models for an earth-like planet. The model
presented here has no spatial dimensions, but contains coupled
parameterizations for all the major components of the hydrological cycle
involving liquid, solid and vapor phases. We investigate the nature of
feedback processes with this model in regulating Earth's climate as a highly
nonlinear coupled system. The model includes solar radiation,
evapotranspiration from dynamically competing trees and grasses, an ocean, an
ice cap, precipitation, dynamic clouds, and a static carbon greenhouse
effect. This model therefore shares some of the characteristics of an Earth
System Model of Intermediate complexity. We perform two experiments with this
model to determine the potential effects of positive and negative feedbacks
due to a dynamic hydrological cycle, and due to the relative distribution of
trees and grasses, in regulating global mean temperature. In the first
experiment, we vary the intensity of insolation on the model's surface both
with and without an active (fully coupled) water cycle. In the second, we
test the strength of feedbacks with biota in a fully coupled model by varying
the optimal growing temperature for our two plant species (trees and
grasses). We find that the negative feedbacks associated with the water cycle
are far more powerful than those associated with the biota, but that the
biota still play a significant role in shaping the model climate. third experiment, we vary the heat and moisture transport coefficient in an
attempt to represent changing atmospheric circulations. |
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