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| Titel |
Mid-Holocene ocean and vegetation feedbacks over East Asia |
| VerfasserIn |
Z. Tian, D. Jiang |
| 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 ; 9, no. 5 ; Nr. 9, no. 5 (2013-09-13), S.2153-2171 |
| Datensatznummer |
250085223
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| Publikation (Nr.) |
 copernicus.org/cp-9-2153-2013.pdf |
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| Zusammenfassung |
| Mid-Holocene ocean and vegetation feedbacks over East Asia are
investigated by a set of numerical experiments performed with the version 4
of the Community Climate System Model (CCSM4). With reference to the
pre-industrial period, most of the mid-Holocene annual and seasonal surface-air
temperature and precipitation changes are found to result from a direct
response of the atmosphere to insolation forcing, while dynamic ocean and
vegetation modulate regional climate of East Asia to some extent. Because of
its thermal inertia, the dynamic ocean induced an additional warming of 0.2 K
for the annual mean, 0.5 K in winter (December–February), 0.0003 K in
summer (June–August), and 1.0 K in autumn (September–November), but a
cooling of 0.6 K in spring (March–May) averaged over China, and it
counteracted (amplified) the direct effect of insolation forcing for the
annual mean and in winter and autumn (spring) for that period. The dynamic
vegetation had an area-average impact of no more than 0.4 K on the
mid-Holocene annual and seasonal temperatures over China, with an average
cooling of 0.2 K for the annual mean. On the other hand, ocean feedback
induced a small increase of precipitation in winter (0.04 mm day−1) and
autumn (0.05 mm day−1), but a reduction for the annual mean (0.14 mm day−1)
and in spring (0.29 mm day−1) and summer (0.34 mm day−1) over China, while it also suppressed the East Asian summer
monsoon rainfall. The effect of dynamic vegetation on the mid-Holocene
annual and seasonal precipitation was comparatively small, ranging from
−0.03 mm day−1 to 0.06 mm day−1 averaged over China. In
comparison, the CCSM4 simulated annual and winter cooling over China agrees
with simulations within the Paleoclimate Modeling Intercomparison Project
(PMIP), but the results are contrary to the warming reconstructed from
multiple proxy data for the mid-Holocene. Ocean feedback narrows this
model–data mismatch, whereas vegetation feedback plays an opposite role but
with a level of uncertainty. |
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