Alkenone distribution in surface sediments of the southern Yellow Sea and implications for the {\text{U}}^{{{\text{K}}\prime}}_{{37}} thermometer |
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| Authors: | Shuqin Tao Lei Xing Xiaofan Luo Hao Wei Yanguang Liu Meixun Zhao |
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| Institution: | (1) Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China;(2) Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao, 266100, China;(3) College of Marine Science and Technology, Tianjin University of Science and Technology, Tianjin, 300457, China;(4) Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China; |
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| Abstract: | The
\textU\textK￠37 {\text{U}}^{{{\text{K}}\prime}}_{{37}} index has been widely applied for sea surface temperature (SST) reconstruction in open ocean environments, but has inherently
limited applications at smaller, regional scales including some marginal seas where both historical and reconstructed SST
records are urgently needed for understanding regional climate evolution. We determined the spatial distribution of alkenone
contents in surface sediments from the southern Yellow Sea to assess the regional
\textU37\textK￠ {\text{U}}_{{{37}}}^{{{\text{K'}}}} —SST relationship for paleo-SST reconstructions. C37:2 and C37:3 alkenones were detected at all 36 sites covering most of the southern Yellow Sea. Alkenone content ranges from 17 to 1,063 ng/g,
with high values (ca. 400 to 1,000 ng/g) at deep water sites and a decreasing trend shoreward. For six samples at shallower
depths near the coast and further offshore, the values were too low for statistical evaluation. This spatial pattern of alkenone
contents is consistent with existing knowledge on the spatial distribution and productivity of alkenone-producing coccolithophorid
species in the region. There is a significant positive relationship (
\textU37\textK￠ = 0.059\textSST - 0.350 {\text{U}}_{{{37}}}^{{{\text{K'}}}} = 0.059{\text{SST}} - 0.350 , R = 0.912, n = 30) between the
\textU37\textK￠ {\text{U}}_{{{37}}}^{{{\text{K'}}}} values and satellite-derived annual mean SSTs (0 m) for the last 27 years, providing support for the application of a region-specific
\textU37\textK￠ {\text{U}}_{{{37}}}^{{{\text{K'}}}} index as paleothermometer in the southern Yellow Sea. However, the slope of the southern Yellow Sea calibration (0.059) is
considerably larger than that of the well-known global core-top calibration (0.033). This implies that global SST trends may
not adequately encompass regional SST patterns and/or that environmental factors other than temperature may gain importance
in explaining coccolithophore dynamics in marginal seas. |
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