王丹, RASHID Harunur
上海海洋大学海洋科学学院, 上海 201306

摘要:
大量研究表明，长链烯酮不饱和度（U₃₇^K'指数）可用于重建过去的海面温度（sea surface temperature，SST），然而是否存在其他因素导致实际温度与重建的SST之间存在差异，以及重建的温度是代表年均SST还是季节性温度都仍有争议。除了反映温度，在受季节性海冰影响或SST较低的区域，长链烯酮C_37：4在C₃₇中的占比（% C_37：4）还能为盐度变化提供重要信息，特别是在拉布拉多和格陵兰岛陆地边缘海域。在此总结了西北大西洋长链烯酮重建古海洋气候的研究进展，指出了在使用U₃₇^K'重建SST时，需要考虑营养盐、横向平流、成岩作用以及烯酮母源的生长季节性等因素，认为% C_37：4有望用作重建过去海冰融水或海冰覆盖情况的替代指标，但季节性因素对烯酮重建古温的影响程度的评估还需要进一步研究。
关键词:长链烯酮海洋表层温度冰融水烯酮%C_37:4西北大西洋
DOI：10.11759/hykx20201228005
分类号:P736.4
基金项目:国家自然科学基金项目（41776064，41976056）

Progress in using the long-chain alkenones to reconstruct the Holocene climate changes in northwest Atlantic Ocean
WANG Dan, RASHID Harunur
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
Abstract:
Numerous studies have demonstrated the application of long-chain alkenone unsaturation ratios (U₃₇^K') to reconstruct past sea-surface temperatures (SSTs). However, whether there are factors resulting in divergence between the actual and reconstructed sea-surface temperatures and whether the reconstructed temperature or the seasonal temperature represents the annual average SST have remained controversial. In regions influenced by seasonal sea-ice or low SSTs, the proportion of long-chain alkenone C_37:4 in C₃₇ (i.e.,%C_37:4) provides significant information on salinity, particularly on the Labrador and Greenland continental margin. This study reviews the progress of using U₃₇^K' in the northwest Atlantic Ocean and evaluates factors, including nutrient, lateral advection, early diagenesis, and seasonality of the production of alkenone-producing algae, to reconstruct SSTs. Our results suggest that C_37:4 can reconstruct past sea-ice released meltwater and sea-ice cover; however, quantifying the contribution of the U₃₇^K' seasonality needs further study.
Key words:long-chain alkenonessea surface temperaturemeltwateralkenone %C_37:4northwest Atlantic Ocean





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