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首页> 外文期刊>Journal of Asian earth sciences >Possible reverse trend in Asian summer monsoon strength during the late Holocene
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Possible reverse trend in Asian summer monsoon strength during the late Holocene

机译：全新世晚期亚洲夏季风强度可能逆转

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摘要

Holocene climate change is characterized as generally cooling in high latitudes and drying in tropical and Asian summer monsoonal regions, following the gradual decrease in northern hemisphere summer insolation over the last 12,000 years. However, some recent high-resolution, well-dated monsoon reconstructions seem to suggest an abnormal increase in Asian summer monsoon strength during the late Holocene, against the generally weakening Holocene trend. Here, we synthesize marine and terrestrial moisture records from Asian monsoonal regions that span most of the Holocene period. Late Holocene strengthening of Asian summer monsoon identified from a wealth of the synthesized monsoon records appears to be a robust feature, which warrants further consideration of its possible causes. The possible reverse trend in Asian summer monsoon strength preceding insolation minima seems to have also occurred during previous interglacial periods, based on speleothem records. We further show a similar late Holocene reverse trend in tropical hydrological changes, suggesting that the Asian summer monsoon behavior might be internally linked to the movement of the average position of the ITCZ and ENSO variability during the late Holocene. On the other hand, we suggest that even though several Holocene temperature records indeed show a reverse trend in the late Holocene, the overall evidence for a link between the late Holocene reverse trend in Asian summer monsoon and global temperature changes is insufficient. The reverse trend in Asian summer monsoon during the late Holocene is difficult to be explained with the traditional boreal insolation-driven view. We suggest that this phenomenon might be linked to austral summer insolation changes and/or greenhouse gas increase. However, we caution that additional paleodimate reconstructions and model simulations are needed to systematically study the spatial pattern and understand underlying mechanism of the late Holocene reverse trend in Asian summer monsoon strength.
机译：全新世气候变化的特征是，在过去的12,000年中，北半球夏季日照量逐渐减少之后，高纬度地区普遍降温，热带和亚洲夏季风区域干燥。然而，最近的一些高分辨率，良好日期的季风重建似乎表明，在全新世晚期，亚洲夏季风强度异常增加，这与全新世趋势总体减弱有关。在这里，我们综合了整个全新世时期的亚洲季风区的海洋和陆地湿度记录。从大量的合成季风记录中识别出的亚洲夏季风的晚全新世加强似乎是一个有力的特征，值得进一步考虑其可能的原因。根据speleothem记录，在日间极小值之前亚洲夏季风强度可能逆转的趋势似乎也发生在前冰期之间。我们还显示出热带水文变化中晚全新世的反向趋势相似，这表明亚洲夏季风的行为可能与晚新世期间ITCZ平均位置的移动和ENSO变异内部相关。另一方面，我们认为，尽管几个全新世的温度记录确实显示出晚全新世的逆趋势，但总体证据表明，亚洲夏季风的晚全新世逆趋势与全球温度变化之间没有联系。全新世晚期亚洲夏季风的反向趋势很难用传统的日晒驱动的观点来解释。我们建议这种现象可能与夏季南方的日照变化和/或温室气体增加有关。但是，我们提醒您，还需要进行其他古生物重建和模型模拟，以系统地研究空间格局并了解亚洲夏季风强度晚全新世逆向趋势的潜在机制。

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