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| Titel |
The evolution of sub-monsoon systems in the Afro-Asian monsoon region during the Holocene- comparison of different transient climate model simulations |
| VerfasserIn |
A. Dallmeyer, M. Claussen, N. Fischer, K. Haberkorn, S. Wagner, M. Pfeiffer, L. Jin, V. Khon, Y. Wang, U. Herzschuh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 2 ; Nr. 11, no. 2 (2015-02-19), S.305-326 |
| Datensatznummer |
250117170
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| Publikation (Nr.) |
 copernicus.org/cp-11-305-2015.pdf |
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| Zusammenfassung |
| The recently proposed global monsoon hypothesis interprets monsoon systems
as part of one global-scale atmospheric overturning circulation, implying a
connection between the regional monsoon systems and an in-phase behaviour of
all northern hemispheric monsoons on annual timescales (Trenberth et al.,
2000). Whether this concept can be applied to past climates and variability
on longer timescales is still under debate, because the monsoon systems
exhibit different regional characteristics such as different seasonality
(i.e. onset, peak and withdrawal). To investigate the interconnection of
different monsoon systems during the pre-industrial Holocene, five transient
global climate model simulations have been analysed with respect to the
rainfall trend and variability in different sub-domains of the Afro-Asian
monsoon region. Our analysis suggests that on millennial timescales with
varying orbital forcing, the monsoons do not behave as a tightly connected
global system. According to the models, the Indian and North African
monsoons are coupled, showing similar rainfall trend and moderate
correlation in centennial rainfall variability in all models. The East Asian
monsoon changes independently during the Holocene. The dissimilarities in
the seasonality of the monsoon sub-systems lead to a stronger response of
the North African and Indian monsoon systems to the Holocene insolation
forcing than of the East Asian monsoon and affect the seasonal distribution
of Holocene rainfall variations. Within the Indian and North African monsoon
domain, precipitation solely changes during the summer months, showing a
decreasing Holocene precipitation trend. In the East Asian monsoon region,
the precipitation signal is determined by an increasing precipitation trend
during spring and a decreasing precipitation change during summer, partly
balancing each other. A synthesis of reconstructions and the model results
do not reveal an impact of the different seasonality on the timing of the
Holocene rainfall optimum in the different sub-monsoon systems. Rather they indicate locally inhomogeneous rainfall changes and show that single palaeo-records should not be used to characterise the rainfall change and
monsoon evolution for entire monsoon sub-systems. |
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