Suspended particulate organic carbon and its carbon isotopic composition in the surface water around the Antarctic Peninsula during summer 2017–2018

IF 1.8 4区地球科学 Q3 ENVIRONMENTAL SCIENCES Antarctic Science Pub Date : 2023-05-12 DOI:10.1017/S0954102023000093

Yunpeng Lin, Y. Li, Yuanhui Huang, Zhihua Chen, Liang Wang, Dong-yi Li, S. Tao

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Abstract

Abstract The concentration of suspended particulate organic carbon (POC) and its carbon isotopic composition (δ13CPOC) were analysed in this study with the aim of exploring the sources and factors influencing levels of POC in the surface water around the Antarctic Peninsula. The scanning electron microscopy results suggest that diatom particles formed the main component of suspended particulate matter, indicating that POC was mainly from in situ primary production. The high concentrations of chlorophyll a and POC in sea water mainly occurred in nearshore and sea-ice edge regions, which might be controlled by nutrient and reactive iron inputs stemming from sea-ice melting. The δ13CPOC in the study area is significantly lower than that in low-latitude waters, with a range of -31.8‰ to -22.8‰ (mean -28.9‰), which was controlled by the high CO2 concentration in the Southern Ocean and might be influenced by phytoplankton growth rates and assemblages. This study helps us to understand material cycling in the Antarctic region under the conditions of global climate change.

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2017-2018年夏季南极半岛周边地表水中悬浮颗粒有机碳及其碳同位素组成

摘要本研究分析了南极半岛周围地表水中悬浮颗粒有机碳（POC）的浓度及其碳同位素组成（δ13CPOC），旨在探讨POC的来源和影响POC水平的因素。扫描电子显微镜结果表明，硅藻颗粒是悬浮颗粒物的主要成分，表明POC主要来自原位初级生产。海水中叶绿素a和POC的高浓度主要发生在近岸和海冰边缘区域，这可能受到海冰融化产生的营养和活性铁输入的控制。研究区的δ13CPOC明显低于低纬度水域，范围为-31.8‰至-22.8‰（平均-28.9‰），这是受南大洋高CO2浓度的控制，可能受浮游植物生长速率和组合的影响。这项研究有助于我们了解全球气候变化条件下南极地区的物质循环。

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来源期刊

Antarctic Science 地学-地球科学综合

CiteScore

3.60

自引率

6.20%

发文量

审稿时长

3 months

期刊介绍： Antarctic Science provides a truly international forum for the broad spread of studies that increasingly characterise scientific research in the Antarctic. Whilst emphasising interdisciplinary work, the journal publishes papers from environmental management to biodiversity, from volcanoes to icebergs, and from oceanography to the upper atmosphere. No other journal covers such a wide range of Antarctic scientific studies. The journal attracts papers from all countries currently undertaking Antarctic research. It publishes both review and data papers with no limits on length, two-page short notes on technical developments and recent discoveries, and book reviews. These, together with an editorial discussing broader aspects of science, provide a rich and varied mixture of items to interest researchers in all areas of science. There are no page charges, or charges for colour, to authors publishing in the Journal. One issue each year is normally devoted to a specific theme or papers from a major meeting.