华北平原东北部小冰期干湿变化特征及其驱动机制  

CHARACTERISTICS AND DRIVING MECHANISMS OF DRY-WET VARIATION IN THE NORTHEAST AREA OF NORTH CHINA PLAIN DURING THE LITTLE ICE AGE

作　　者：范保硕 李月丛[1,2,3] 吕厚远 许清海[1,2,3] 谢红丽[1,2,3] 张芸 佘梓靖 葛亚汶 张振 赵永杰 FAN Baoshuo;LI Yuecong;LÜ Houyuan;XU Qinghai;XIE Hongli;ZHANG Yun;SHE Zijing;GE Yawen;ZHANG Zhen;ZHAO Yongjie(College of Geographical Sciences,Hebei Normal University,Shijiazhuang 050024,Hebei;Key Laboratory of Environmental Evolution and Ecological Construction of Hebei Province,Hebei Normal University,Shijiazhuang 050024,Hebei;Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change,Shijiazhuang 050024,Hebei;Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution,China Geological Survey,Shijiazhuang 050061,Hebei)

机构地区：[1]河北师范大学地理科学学院,河北石家庄050024 [2]河北省环境演变与生态建设重点实验室,河北石家庄050024 [3]河北省环境变化遥感识别技术创新中心,河北石家庄050024 [4]中国科学院地质与地球物理研究所,中国科学院新生代地质与环境重点实验室,北京100029 [5]中国地质调查局第四纪年代学与水文环境演变重点实验室,河北石家庄050061

出　　处：《第四纪研究》2022年第6期1586-1600,共15页Quaternary Sciences

基　　金：国家自然科学基金区域创新发展联合基金项目(批准号:U20A20116);国家自然科学基金项目(批准号:41877433和42007404);中国地质科学院水文地质环境地质研究所联合开放基金项目(批准号:SK202105KF01)共同资助。

摘　　要：小冰期作为距今最近的一次冷期,是研究寒冷事件对人类社会和自然环境影响的重要参照期,其气候总体偏冷已达成共识,但干湿变化存在明显的时间和区域差异。华北平原作为东亚季风系统控制的核心区,对气候变化响应十分敏感,由于受到研究材料、技术方法等因素限制,致使华北平原小冰期次一级干湿变化过程研究较少,且缺乏高分辨率的定量研究。本研究在6个AMSC定年的基础上,通过对秦皇岛七里海湖泊深度为245~62 cm的钻孔沉积物92个样品的孢粉分析,利用加权平均偏最小二乘回归法(WA-PLS),高分辨率地定量重建了华北平原东北部1250~1610 A.D.的降水变化过程。结果显示:小冰期早期(1310~1450 A.D.)年降水量平均为565 mm,较中世纪温暖期降水减少约25 mm,气候变干,但程度较轻;小冰期中期(1450~1610 A.D.)降水量进一步降低,降至525 mm左右,最低可达410 mm,气候达到研究段最为干旱时期。分析认为,华北平原东北部地区小冰期冷干变化过程可能受太阳辐射量、火山活动和太平洋年代际振荡(PDO)的共同驱动。The Little Ice Age(LIA), the latest cold period, is a significant reference period for studying the impact of cold events on human society and the natural environment. There is a consensus that the climate of the LIA was generally cold, but there were significant temporal and regional differences in its wet and dry variability. As the core area controlled by the East Asian monsoon system, the North China Plain is very sensitive to climate change. However, due to the limitations of research materials and technical methods, there are a few studies on the secondary dry-wet processes during the LIA in the North China Plain, and there is a lack of high-resolution quantitative studies. In this study, based on six AMSC dating, we quantitatively reconstructed the high-resolution precipitation variation process during the period 1250~1610 A.D. in the northeastern part of the North China Plain using Weighted Averaging Partial Least Sequence(WA-PLS)method by 92 samples(depth: 245~62 cm)pollen analysis of the QLH core(39° 35′11.457″N, 119° 16′02.66″E) from Qilihai Lagoon in Qinhuangdao(39° 34′30″~39° 35′27.6″N, 119° 14′56.4″~119° 16′19.2″E). The results show that the annual precipitation in the early-LIA(1310~1450 A.D.)was 565 mm on average, which was ca. 25 mm less than that in the Medieval Warm Period(MWP), and the climate became drier, but to a lesser extent;the precipitation in the mid-LIA(1450~1610 A.D.)was further decreased to ca.525 mm and the lowest was up to ca.410 mm, and the climate reached the driest in the study section. The analysis suggests that the LIA cold-dry variation process in the northeastern part of the North China Plain may be driven by a combination of solar radiation, volcanic activity, and the Pacific Decadal Oscillation(PDO).

关 键 词：华北平原东北部 七里海 小冰期 降水定量重建 孢粉分析 

分 类 号：P534.632[天文地球—第四纪地质学] Q944.571[天文地球—古生物学与地层学]