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首页> 外文期刊>Journal of quaternary science: JQS >Insolation and cross-hemispheric controls on Australian monsoon variability over the past 180ka: New evidence from offshore southeastern Papua New Guinea
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Insolation and cross-hemispheric controls on Australian monsoon variability over the past 180ka: New evidence from offshore southeastern Papua New Guinea

机译：过去180ka的澳大利亚季风变化的日照和跨半球控制：来自巴布亚新几内亚东南部近海的新证据

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摘要

The Australian summer monsoon (ASM) is primarily a synoptic feature determined by the differential thermal response to solar insolation between the Australian continent and the western Pacific warm pool (WPWP) in austral summer. Little is known about the process involved in driving long-term ASM variability. Here we present a 180 ka record of terrestrial fluxes into offshore southeastern Papua New Guinea (PNG), a prevailing monsoon area in the WPWP. Terrestrial fluxes were estimated by a ~(230)Th-normalized method, indicating higher terrestrial inputs into the ocean during glacial stages. We argue that the higher terrestrial fluxes are mainly fluvial, which in turn are linked to stronger ASM precipitation on land, though the increased terrestrial flux could possibly also be due to the lowstand or glacial erosion of mountain glaciers. Cross-spectral analysis indicates that the ASM precipitation maxima are controlled by local summer insolation maxima, WPWP sea-surface temperature minima and East Asian winter monsoon (EAWM) maxima in precession frequency bands (21 ka~(-1)). This result suggests that the 21 ka components of the ASM in the past 180 ka are not only insolation driven but also a dynamic component strengthened by cross-hemispheric pressure gradient resulted from the precession maxima forcing.
机译：澳大利亚夏季风（ASM）主要是天气特征，由澳大利亚大陆和夏季南方的西太平洋暖池（WPWP）对太阳日照的不同热响应决定。关于导致长期ASM变异的过程知之甚少。在这里，我们介绍了180 kp记录的巴布亚新几内亚东南部（PWP）盛行季风区东南部沿海近海通量。通过〜（230）Th归一化方法估算了陆地通量，表明在冰川期有更多的陆地输入海洋。我们认为，较高的陆地通量主要是河流，这反过来与陆地上更强的ASM降水有关，尽管增加的陆地通量也可能是由于高山冰川的低位或冰川侵蚀。互谱分析表明，在进动频段（21 ka〜（-1））中，ASM的降水最大值受局部夏季日照最大值，WPWP海表温度最小值和东亚冬季风（EAWM）最大值控制。该结果表明，过去180 ka中ASM的21 ka分量不仅受到日射驱动，而且由于进动最大值强迫而导致的跨半球压力梯度增强了动态分量。

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