Abrupt mid-Holocene decline in the Indian Summer Monsoon caused by tropical Indian Ocean cooling
Abrupt mid-Holocene decline in the Indian Summer Monsoon caused by tropical Indian Ocean cooling
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热带印度洋变冷导致印度夏季风在全新世中期突然减弱
DOI：
10.1007/s00382-020-05363-7
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发表时间：
2020-07
期刊：
影响因子：
4.6
通讯作者：
Herzschuh Ulrike
中科院分区：
文献类型：
--
作者：
Wang Yongbo;Shen Ji;Wang Yong;Liu Xingqi;Cao Xianyong;Herzschuh Ulrike
印度夏季风(ISM)的演变一直被广泛研究，传统上被解释为轨道强迫变化和热带辐合带(ITCZ)迁移的结果。近几年的研究逐步提出了海面温度(SST)对千年尺度ISM变化的潜在影响。为了更好地了解ISM的全新世演化，特别是对SST变化的潜在响应，在滇西高原北海湿地恢复了一个覆盖11.1ka的643 cm连续沉积序列。化石孢粉分析表明，全新世早期植被以常绿阔叶林为主，代表了与强烈ISM相关的温暖湿润时期。落叶阔叶林和草地从5.2卡路里扩大。至今，伴随着丰富的植物遗迹的出现，预示着湿地系统的形成。对花粉组合的排序分析进一步证实了约5.2℃时植被的突然更替。Ka BP，这与重建的年平均降水量的突然下降(Pann，从约1400到1100 mm)是一致的，并表明夏季风的突然下降。我们对ISM区域和东非的各种记录进行了气候变化测试，也发现了这种现象，这不能用太阳辐射的变化或ITCZ的迁移来解释。在印度洋探测到了一次全新世中期的冷却，特别是热带印度洋的SST下降了约5.5千卡。Ka BP。热带印度洋的冷却可能通过抑制季风季和辐合过程的持续时间而导致夏季风的突然消退，而根据最小概念模式的结果，这是由季风的突然消退所支持的。
The evolution of the Indian Summer Monsoon (ISM) has been widely investigated and traditionally interpreted as consequences of orbital forcing change and the migration of the Intertropical Convergent Zone (ITCZ). The potential influence of sea-surface temperature (SST) on ISM variation at millennial time scales has been progressively proposed in recent studies. Towards a better understanding of Holocene evolution of ISM, especially the potential response to variations in SST, a 643 cm continuous sediment sequence covering the past 11.1 ka was recovered from Beihai Wetland in western Yunnan Plateau. Fossil pollen analysis revealed that evergreen broadleaved forest dominated the regional vegetation in the early Holocene, which represented a warm and humid period associated with strong ISM. Expansions of deciduous broadleaved forest and grassland from 5.2 cal. ka BP to the present, together with the appearance of abundant plant remains, indicate the formation of the wetland system. Ordination analysis of the pollen assemblages further confirmed the abrupt vegetation turnover at ca. 5.2 cal. ka BP, which is consistent with the abrupt decline in reconstructed mean annual precipitation (Pann, from ca. 1400 to 1100 mm), and indicates an abrupt decline in the summer monsoon. We performed a climate regime shift test on various records from the ISM domain and eastern Africa and found this phenomenon as well, which could not be explained by changes in solar insolation or the migration of the ITCZ. A mid-Holocene cooling was detected from the Indian Ocean, especially a decreased SST in the tropical Indian Ocean ca. 5.5 cal. ka BP. Cooling of the tropical Indian Ocean possibly caused the abrupt retreat of the summer monsoon by restraining the duration of the monsoonal season and the convergent process, which was supported by an abrupt monsoon decline based on results from a minimal concept model.
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影响因子：
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作者：
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DOI：
10.1177/0959683617715692
发表时间：
2018-01
期刊：
The Holocene
影响因子：
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作者：
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DOI：
10.1016/j.palaeo.2016.07.017
发表时间：
2016-11
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
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