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• W2361101493 abstract "利用漫反射光谱技术得到湖光岩玛珥湖沉积物的叶绿素a浓度.通过与TOC、Sr/Rb比值和磁化率的对比发现,叶绿素a浓度能够忠实地反映湖泊初级生产力的变化,较高的叶绿素a浓度代表季风较强、降雨量较高,反之亦然.湖光岩玛珥湖沉积物多环境代用指标分析结果显示,湛江地区早全新世季风强盛,中全新世季风迅速衰退.这种全新世季风演化模式与北半球季风区的很多地质记录以及北纬30°变化趋势相似,反映了太阳辐射是湛江地区千年尺度季风演化的主要驱动因素,但是湛江地区的季风演化滞后于太阳辐射变化大约2200 a.叶绿素a浓度记录显示6000 a BP左右季风迅速减弱,这与其他记录显示的季风渐变模式不同.一方面,太阳辐射渐变激发了湛江地区植被-大气圈的负反馈作用,这可能是造成6000 a BP左右气候迅速变干的原因之一;另一方面,沉积速率增加导致的稀释作用放大了叶绿素a浓度下降的趋势.3600 a BP以来的沉积环境可能受到了人类活动的影响.;Chlorophyll-a concentration of Huguangyan Maar Lake sediments were determined by diffuse reflectance spectroscopy. Through comparison with TOC, Sr intensity and magnetic susceptibility we concluded that chlorophyll-a can be taken as a reliable proxy of primary production, higher chlorophyll-a absorption reflects stronger monsoon intensity and higher precipitation, and vice versa. Holocene environment evolution at Zhanjiang area reconstructed by chlorophyll-a, TOC, Sr intensity and magnetic susceptibility of Huguangyan Maar Lake sediments demonstrated that the monsoon intensity in Zhanjiang area was strong in the early Holocene and declined dramatically since 6000 a BP. Holocene climate evolutional pattern at Zhanjiang area is similar with many other records from the monsoonal areas of the North hemisphere and summer isolation at 30°N, implying that solar isolation is the driving force of millennial-scale Holocene monsoon evolution at Zhanjiang area. However, monsoonal evolution lags behind solar isolation by about 2200 a. Monsoon strengthen demonstrated by chlorophyll-a declined significantly since 6000 a BP. Nonetheless, all the other records display gradual weakening process. Negative feedback of vegetation-atmosphere induced by solar isolation might have caused quick droughty trend, on the other hand, dilution effect led by increased sedimentary rate may amplify declining trend of chlorophyll-a around 6000 a BP. Sedimentary environment since 3600 a BP could be impacted by human activities." @default.
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• W2361101493 date "2012-01-01" @default.
• W2361101493 modified "2023-10-17" @default.
• W2361101493 title "Paleoenvironment evolution since the Holocene reflected by diffuse reflectance spectroscopy from Huguangyan Maar Lake sediments, Guangdong Province" @default.
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• W2361101493 doi "https://doi.org/10.18307/2012.0618" @default.
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