Palaeoenvironmental changes from pollen record in deep sea core PC-1 from northern Okinawa Trough, East China Sea during the past 24 ka
Palaeoenvironmental changes from pollen record in deep sea core PC-1 from northern Okinawa Trough, East China Sea during the past 24 ka
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东海冲绳海槽北部深海核心PC-1花粉记录近24ka以来古环境变化
DOI：
10.1007/s11434-009-0227-y
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发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
Sun XiangJun
中科院分区：
文献类型：
--
作者：
Xu HongYan;Chang FengMing;Luo YunLi;Sun XiangJun
东海北方冲绳海槽PC-1孔的孢粉记录提供了24 cal. kaBP以来植被和气候变化的信息。对103个样品进行了孢粉学分析，采样间隔为8 cm，时间分辨率为230 a。四个花粉带被确认：区I（812-715 cm，24.2-21.1 cal. kaBP），带II（715-451 cm，21.1-15.2 cal. kaBP），带III Ⅳ带（251-0 cm，10.8-0.3 cal. kaBP），分别对应于MIS 3晚期、末次盛冰期（LGM）、冰消期和全新世。末次盛冰期的特征是草本植物占优势，主要是蒿属植物，花粉大量流入，这意味着裸露大陆架上的植被开阔，气候凉爽干燥。冰消期是气候变暖阶段，松类植物比例增加，蒿类植物比例减少，海平面迅速上升。全新世以乔木花粉为主，Castanea-Castanopsis花粉迅速增加，反映了万年青落叶阔叶混交林的发育和温暖湿润的气候。全新世低的花粉流入量可能意味着大陆架的淹没和花粉源区的退缩。在这一上部带发现的花粉组合所指示的植被与日本九州的现今植被相一致。Phyllocladus起源于菲律宾北吕宋岛、塔斯马尼亚岛和新西兰的潮湿山区，在PC-1孔中零星出现，可能是古黑潮或强烈夏季风的影响。松树和草本植物所占比例的变化反映了海平面的波动，高松树比例对应于高海平面。花粉百分比记录的频谱分析揭示了许多千年尺度的周期性，如6.8，3.8，2.2，1.6 ka的周期。
A pollen record of core PC-1 from the northern Okinawa Trough, East China Sea (ECS), provides information on vegetation and climate changes since 24 cal. kaBP. A total of 103 samples were palynologically analyzed at 8 cm intervals with a time resolution of 230 a. Four pollen zones are recognized: zone I (812–715 cm, 24.2–21.1 cal. kaBP), zone II (715–451 cm, 21.1–15.2 cal. kaBP), zone III (451–251 cm, 15.2–10.8 cal. kaBP), zone IV (251–0 cm, 10.8–0.3 cal. kaBP), corresponding to Late MIS 3, Last Glacial Maximum (LGM), deglaciation and Holocene, respectively. The LGM is characterized by the dominance of herbs, mainlyArtemisia, and high pollen influx, implying an open vegetation on the exposed continental shelf and a cool and dry climate. The deglaciation is a climate warming stage withPinuspercentage increased andArtemisiapercentage decreased and a rapid sea-level rise. The Holocene is characterized by predominance of tree pollen with rapid increase inCastanea-Castanopsisindicating the development of mixed evergreen and deciduous broad-leaved forest and a warm, humid climate. Low pollen influx during the Holocene probably implies submergence of the continental shelf and retreat of the pollen source area. The vegetation indicated by pollen assemblage found in this upper zone is consistent with the present vegetation found in Kyushu, Japan. Originating from the humid mountain area of North Luzon of the Philippines, Tasmania and New Zealand,Phyllocladuswith sporadic occurrence throughout PC-1 core probably suggests the influence of Palaeo-Kuroshio Current or intense summer monsoon. The observed changes inPinusand Herbs percentage indicate fluctuations of the sea level, and highPinuspercentage corresponds to high sea level. Spectrum analysis of the pollen percentage record reveals many millennial-scale periodicities, such as periodicities of 6.8, 3.8, 2.2, 1.6 ka.
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影响因子：
1.9
作者：
H. Ujiié;Y. Ujiié
通讯作者：
H. Ujiié;Y. Ujiié
影响因子：
2.8
作者：
Y. Saito;H. Katayama;K. Ikehara;Y. Kato;E. Matsumoto;K. Oguri;M. Oda;Mariko Yumoto
通讯作者：
Y. Saito;H. Katayama;K. Ikehara;Y. Kato;E. Matsumoto;K. Oguri;M. Oda;Mariko Yumoto
影响因子：
64.8
作者：
BOND, G;BROECKER, W;BONANI, G
通讯作者：
BONANI, G
影响因子：
64.8
作者：
BROECKER, WS
通讯作者：
BROECKER, WS
影响因子：
5.3
作者：
Jian, ZM;Wang, PX;Cheng, XR
通讯作者：
Cheng, XR