State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China.
Science. 2011 Aug 5;333(6043):719-23. doi: 10.1126/science.1203752.
The modern Indian summer monsoon (ISM) is characterized by exceptionally strong interhemispheric transport, indicating the importance of both Northern and Southern Hemisphere processes driving monsoon variability. Here, we present a high-resolution continental record from southwestern China that demonstrates the importance of interhemispheric forcing in driving ISM variability at the glacial-interglacial time scale as well. Interglacial ISM maxima are dominated by an enhanced Indian low associated with global ice volume minima. In contrast, the glacial ISM reaches a minimum, and actually begins to increase, before global ice volume reaches a maximum. We attribute this early strengthening to an increased cross-equatorial pressure gradient derived from Southern Hemisphere high-latitude cooling. This mechanism explains much of the nonorbital scale variance in the Pleistocene ISM record.
现代印度夏季风（ISM）的特征是异常强烈的半球间输运，表明北半球和南半球过程对季风变化的驱动都很重要。在这里，我们呈现了来自中国西南部的高分辨率大陆记录，该记录表明半球间强迫在驱动 ISM 变化方面也具有冰川-间冰期时间尺度上的重要性。间冰期 ISM 极大值主要与全球冰量最小值相关的增强型印度低压有关。相比之下，冰川期 ISM 达到最小值，实际上在全球冰量达到最大值之前就开始增加。我们将这种早期的加强归因于源自南半球高纬度冷却的经向气压梯度的增加。这种机制解释了更新世 ISM 记录中大部分非轨道尺度方差。
