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首页> 外文期刊>Journal of Asian earth sciences >Holocene hydrological and sea surface temperature changes in the northern coast of the South China Sea
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Holocene hydrological and sea surface temperature changes in the northern coast of the South China Sea

机译：南海北部沿海全新世水文和海面温度变化

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In order to reconstruct the Holocene environmental history of a coastal site in the northern South China Sea, this study analysed the organic carbon isotope ratios (delta C-13(org)) and alkenone unsaturation ratios (U-37(K)) from a 36.5 m-long sediment core drilled at seabed in the mouth region of the Pearl River estuary and generated a coupled hydrological and temperature record. This record reveals changes of monsoon-induced sediment discharge and sea surface temperature of the Holocene in four stages. In Stage I, the site was under fluvial conditions prior to postglacial marine transgression. Stage II saw an increase of sea surface temperature from c. 23.0 degrees C to 27.0 degrees C, associated with a strengthened summer monsoon from c. 10,350 to 8900 cal. years BP. This was also a period of rapid sea-level rise and marine transgression, during which the sea inundated the palaeo-incised channel, i.e. the lower part of the T-shape accommodation space created by the rising sea. In these 1500 years, fluvial discharge was strong and concentrated within the channel, and the high sedimentation rate (11.8 mm/year) was very close to the rate of sea-level rise. In the subsequent 2000 years (Stage III) sea level continued to rise and the sea flooded the broad seabed above the palaeoincised channel, resulted in fluvial discharge spreading thinly across the wide accommodation space and a much reduced sedimentation rate (1.8 mm/year). Sea surface temperature in this stage reached 27.3 degrees C initially, but dropped sharply to 26.1 degrees C towards c. 8200 cal. years BP. The final stage covers the last 7000 years, and the site was under a stable sea level. Sedimentation in this stage varied a little, but averaged at 1.8 mm/year. Whilst fluvial discharge and sea surface temperature didn't change much, two short periods of hydrological and temperature change were observed, which are related to the climatic cooling events of c. 4200 cal. years ago and the Little Ice Age. (C) 2017 Elsevier Ltd. All rights reserved.
机译：为了重建南海北部沿海地区全新世的环境历史，本研究从有机碳同位素比（δC-13（org））和烯酮不饱和度比（U-37（K））中分析了在珠江口河口海床钻了36.5 m长的沉积岩心，产生了水文和温度的耦合记录。该记录揭示了季风引起的沉积物排放和全新世海面温度在四个阶段的变化。在第一阶段，该地点在冰期后海侵之前处于河流条件下。在第二阶段，海面温度从c升高。 23.0摄氏度至27.0摄氏度，与c以来增强的夏季季风有关。 10,350至8900卡路里年BP。这也是海平面快速上升和海侵的时期，在此期间，海淹没了古生物增加的河道，即由上升的海浪形成的T形容纳空间的下部。在这1500年中，河道中的河水排放很强并且集中在河道内，高的沉积速率（11.8毫米/年）非常接近海平面上升的速率。在随后的2000年（第三阶段），海平面继续上升，海淹没了古生化河道上方的宽阔海床，导致河流排放物在整个宽阔的居住空间中散布得很薄，沉积速度大大降低（1.8毫米/年）。在此阶段，海面温度最初达到27.3摄氏度，但向c急剧下降至26.1摄氏度。 8200卡路里年BP。最后阶段涵盖了过去的7000年，站点处于稳定的海平面之下。该阶段的沉积物变化不大，但平均为1.8 mm /年。河流排放和海面温度变化不大，但观察到两个短时间的水文和温度变化，这与c的气候降温事件有关。 4200卡路里年前和小冰河世纪。 （C）2017 Elsevier Ltd.保留所有权利。

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