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| Titel |
Changes in the strength and width of the Hadley Circulation since 1871 |
| VerfasserIn |
J. Liu, M. Song, Y. Hu, X. Ren |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2012-07-19), S.1169-1175 |
| Datensatznummer |
250005705
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| Publikation (Nr.) |
 copernicus.org/cp-8-1169-2012.pdf |
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| Zusammenfassung |
| Recent studies demonstrate that the Hadley Circulation has
intensified and expanded for the past three decades, which has important
implications for subtropical societies and may lead to profound changes in
global climate. However, the robustness of this
intensification and expansion that should be considered when interpreting
long-term changes of the Hadley Circulation is still a matter of
debate. It also remains largely unknown how the Hadley Circulation
has evolved over longer periods. Here, we present long-term variability of
the Hadley Circulation using the 20th Century Reanalysis. It shows a slight
strengthening and widening of the Hadley Circulation since the late 1970s,
which is not inconsistent with recent assessments. However, over centennial
timescales (1871–2008), the Hadley Circulation shows a tendency towards a more
intense and narrower state. More importantly, the width of the Hadley
Circulation might have not yet completed a life-cycle since 1871. The
strength and width of the Hadley Circulation during the late 19th to early
20th century show strong natural variability, exceeding variability that
coincides with global warming in recent decades. These findings raise the
question of whether the recent change in the Hadley Circulation is primarily
attributed to greenhouse warming or to a long-period oscillation of the Hadley
Circulation – substantially longer than that observed in previous studies. |
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