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Date:7/12/2013

me, continued its activity for 15 million years. During this period of activity, the plume spread out beneath the crust and "infected" other volcanoes within 800 km of the center. Subsequently, around half of the original volcanoes within this province have been consumed back into the deep Earth by plate movements. However the remainders have provided new information on how this important volcanic region developed.


Variation of East Asian monsoon precipitation during the past 21 k.y. and potential CO2 forcing
Huayu Lu et al., School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China. First published on 11 July 2013, http://dx.doi.org/10.1130/G34488.1.

East Asian monsoon precipitation influences the lives of 1.6 billion people today, its swings have attracted many attentions but the forcing mechanism has not been well understood. To investigate the monsoon variation in the past can provide critical insight on causes of the changes. The natural archives such as lake sediments and loess deposits preserved information of the past monsoon precipitation changes, because the monsoon precipitation modulated vegetation density and composition which left vestiges in these sediments. Dr. Lu and his colleagues use Chinese loess deposits, which are independently dated, to reconstruct the monsoon precipitation since 21 ka (ka = thousand years ago). Their results show that monsoon precipitation persistently decreased from 21 ka to ca. 8 ka, and increased after ca. 8 ka, with a precipitation peak at 8-3 ka. These changes in East Asian summer monsoon precipitation are synchronous with changes in high-northern-latitude ice volume/ice cover and atmospheric CO2. These new data suggest that variation of the monsoon precipitation was probably driven by CO2-forced high-northern-latitude temperature changes, shifting the location of the intertropical conv
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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