Journal of Tropical Oceanography >
Response of planktonic foraminifera to Holocene marine environmental changes in the Andaman Sea
Copy editor: LIN Qiang
Received date: 2019-01-15
Request revised date: 2019-04-01
Online published: 2019-11-26
Supported by
National Natural Science Foundation of China(91228207)
National Natural Science Foundation of China(41476040)
Strategic Leading Science & Technology Programme, Chinese Academy of Sciences(XDA11030104)
Copyright
Through analysis of planktonic foraminifera in a gravity core ADM-C1 from the Andaman Sea, the response of planktonic foraminifera to Holocene marine environmental changes in the sea was discussed. The result shows that the planktonic foraminiferal communities in this region are dominated by tropical warm-water species Globigerinoides ruber, Globigerinoides sacculifer, Neogloboquadrina dutertrei, and Pulleniatina obliquiloculata. The relative abundance of G. ruber shows a gradual decreased trend from the early Holocene to present, which is roughly opposite to that of G. sacculifer. The relative abundance of N. dutertrei is higher during 11 to 7.9 ka BP (before present), generally lower during 7.9 to 3.8 ka BP, and then gradually increases after 3.8 ka BP. P. obliquiloculata shows an almost opposite trend to that of N. dutertrei. Our result indicates no obvious Pulleniatina Minimum Eventduring the late Holocene, occurs in the Andaman Sea. Q-mode factor analyses of planktonic foraminifera in the core ADM-C1 identify three stages in marine environmental changes during the Holocene. During the early Holocene (11-7.9 ka BP), planktonic foraminifera assemblage was dominated by G. ruber, N. dutertrei and G. bulloides, which reflected that strong summer monsoon and precipitation led to lower sea surface salinity, while the influence of winter monsoon was also strong during this stage. During 7.9-3.8 ka BP, G. ruber, P. obliquiloculata and Globigerinella aequilateralis dominated, indicating lower sea surface salinity during this period. Meanwhile, there was obviously increase in abundance of subsurface water species, reflecting strong mixing in the upper-ocean waters, possibly due to the strong Indian Ocean summer monsoon at this stage. After 3.8 ka BP, G. sacculifer, N. dutertrei and P. obliquiloculata became the dominant species. The abundance of G. ruber declined obviously, indicating that the salinity of surface sea water significantly increased during this period, which was consistent with the reduced Indian Ocean summer monsoon precipitation. The phase change of the Holocene marine environment reflected by the planktonic foraminiferal assemblages in the Andaman Sea is well consistent with the terrestrial records on the Indian Ocean summer monsoon, and it also shows good consistent with the wind intensity variation in Indian Ocean summer monsoon reflected by sensitive grain size proxy of the same core, suggesting rapid response of planktonic foraminifera to marine environmental changes in the tropical marginal seas.
ZHANG Lingzhi , XIANG Rong , TANG Linggang , YANG Yiping , ZHONG Fuchang . Response of planktonic foraminifera to Holocene marine environmental changes in the Andaman Sea[J]. Journal of Tropical Oceanography, 2019 , 38(6) : 51 -61 . DOI: 10.11978/2019010
图1 研究区海流模式与取样站位(改自Cao et al, 2015)Fig. 1 Circulation patterns of the study area and sampling sites. Modified after Cao et al (2015) |
表1 ADM-C1孔中浮游有孔虫方差最大因子得分Tab. 1 Varimax factor score matrix for the planktonic foraminifera in Core ADM-C1(The bold numbers are species with higher scores) |
属种 | 主因子1 | 主因子2 | 主因子3 |
---|---|---|---|
Globigerinoides ruber | 2.943 | 0.466 | -3.503 |
Globigerinoides sacculifer | -1.779 | 3.571 | -0.606 |
Neogloboquadrina dutertrei | 2.458 | 2.370 | 1.926 |
Pulleniatina obliquiloculata | -1.020 | 1.375 | -1.210 |
Globorataloides hexagonus | 0.176 | -0.033 | -0.202 |
Globigerinita glutinata | 0.154 | -0.015 | -0.411 |
Globigerina bulloides | 1.371 | 0.882 | 1.496 |
Globigerina calida | -0.110 | -0.034 | -0.389 |
Globiberinella aequilateralis | -0.953 | 0.443 | -1.155 |
Globigerinoides tenellus | -0.145 | 0.020 | -0.223 |
Globoquadrina conglomerata | -0.128 | 0.415 | 0.119 |
Globigerinoides conglobatus | -0.315 | 0.301 | -0.201 |
Globorotalia menardii | -0.024 | 0.488 | 0.248 |
Globorotalia scitula | 0.075 | -0.021 | 0.040 |
Orbulina universa | -0.289 | 0.172 | -0.271 |
Sphaeroidinella dehiscens | -0.072 | 0.131 | 0.009 |
Globorotalia tumida | 0 | 0.035 | 0.028 |
Globorotalia ungulata | 0.028 | 0.020 | -0.001 |
Globorotalia theyeris | -0.004 | -0.008 | -0.042 |
Candeina nitida | -0.036 | 0.025 | -0.039 |
Globigerina digitata | -0.011 | 0.012 | -0.003 |
Globigerinella adamis | -0.011 | 0.012 | -0.003 |
方差 | 36.253 | 28.209 | 34.714 |
累计方差 | 36.253 | 64.462 | 99.176 |
注: 加粗数字为得分较高属种 |
图5 ADM-C1孔中浮游有孔虫群落全新世阶段变化与其他古环境记录对比a. Qunf cave石笋δ18O值变化(Fleitmann et al, 2003); b. 安达曼海RC12-144孔G. ruber δ18O值变化(Rashid et al, 2007); c. SO130-289KL的Zr/Al(Deplazes et al, 2014); d. 主要粒组1.5~11.9μm与11.9~74μm的平均粒径 (黄云 等, 2017) ; e—g. ADM-C1孔中浮游有孔虫因子载荷变化。阴影部分为阶段2 Fig. 5 Changes of planktonic foraminiferal in Core ADM-C1 compared with other paleoenvironmental records. a. The records of speleothem δ18O from the Qunf Cave (Fleitmann et al, 2003). b. δ18Osw of Core RC12-344 in the Andaman Sea (Rashid et al., 2007); c. Zr/Al of SO130-289 KL (Deplazes et al, 2014); d. the average grain size variation of grain groups 1.5~11.9 m and 11.9~74 m in ADM-C1 (Huang et al, 2017); e-g. the variation of main planktonic foraminiferal factors in Core ADM-C1. The dark shade indicates phrase 2 |
图6 安达曼海三个岩芯ADM-C1、SK168和AAS11 (Sijinkumar et al, 2011)的P. obliquiloculata相对含量对比阴影为普林虫低值事件Fig. 6 Abundance of P.obliquiloculata in Core ADM-C1, SK168 and AAS11 (Sijinkumar et al, 2011) |
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