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陆架边缘海是陆海相互作用研究中最为关键的区域,也是全球重要的碳储库,在区域物质循环过程中发挥着重要的作用。基于2012年5月和11月对黄渤海海域的综合调查,对该海域水体和沉积物中有机碳的含量与分布进行了分析,并结合相关文献资料对黄渤海有机碳的收支进行了估算。主要结论为:黄渤海溶解有机碳和颗粒有机碳均呈近岸河口区域高、离岸低的分布趋势;有机碳的组成以溶解有机碳为主,颗粒有机碳由海洋自生的有机碳和陆地来源的有机碳组成;黄渤海沉积物有机碳高值区主要分布在河口和泥质区,其组成也是由海洋自生和陆源混合而成,其中渤海以陆源为主,而黄海以海源为主。黄渤海有机碳收支评估表明,有机碳的主要来源为初级生产力产生的有机物,其贡献为(6 760±971)×104t/a,占有机碳输入总量的(74±10)%,沉积物再悬浮的通量为(884±200)×104t/a,东海向黄海输入的通量为(679±107)×104t/a,河流及陆源输入的通量为(643±63)×104t/a,大气干湿沉降的通量为(141±39)×104t/a,其贡献分别占有机碳输入总量的(10±2.2)%,(7.5±1.2)%,(7.0±0.7)%和(1.5±0.4)%;黄渤海有机碳的主要支出为呼吸消耗,其贡献为(5 190±746)×104t/a,占有机碳输出总量的(57±8.2)%,黄海向东海输出的通量为(2 150±370)×104t/a,有机碳沉积通量为(1 030±225)×104t/a,有机碳降解通量为(737±191)×104t/a,其贡献分别占有机碳输出总量的(24±4.1)%,(11±2.5)%和(8.0±2.1)%。有机碳收支评估表明黄渤海有机碳以海洋自生来源为主,且具有潜在碳的“汇”的特性,水体中外源输入和海洋自生有机碳的(1.6±0.3)%埋藏于该海域内。
The marginal sea of the shelf is the most crucial area in the study of land-sea interaction and is also an important carbon reservoir in the world. It plays an important role in the regional material circulation. Based on a comprehensive survey of the Yellow Sea and the Bohai Sea in May and November 2012, the content and distribution of organic carbon in water bodies and sediments in this area were analyzed, and the balance of organic carbon in the Yellow Sea and the Bohai Sea was estimated based on relevant literature . The main conclusions are as follows: the dissolved organic carbon and particulate organic carbon in the Yellow Sea and the Bohai Sea are both high and off-shore in the near-estuary estuary. The composition of organic carbon is dominated by dissolved organic carbon, which is composed of marine organic carbon and land Organic carbon formed in the Yellow Sea and the Bohai Sea. The high value areas of organic carbon in the sediments of the Yellow Sea and the Bohai Sea are mainly distributed in the estuarine and muddy areas. Their composition is also composed of oceanic self-generation and terrestrial mixing, with the Bohai Sea dominated by terrestrial sources and the Yellow Sea dominated by sea sources. The assessment of organic carbon income and expenditure in the Yellow Sea and the Bohai Sea shows that the main source of organic carbon is the organic matter produced by primary productivity, contributing (6 760 ± 971) × 104 t / a and accounting for (74 ± 10)% of the total organic carbon input (884 ± 200) × 104t / a. The fluxes input to the Yellow Sea from the East China Sea were (679 ± 107) × 104t / a and the fluxes from the rivers and terrestrial sources were (643 ± 63) × 104t / a, and the flux of atmospheric wet-dry deposition was (141 ± 39) × 104t / a, accounting for (10 ± 2.2)%, (7.5 ± 1.2)% and (7.0 ± 0.7) % And (1.5 ± 0.4)%, respectively. The main expenditure of organic carbon in the Yellow Sea and the Bohai Sea was respiratory consumption, which contributed to (5190 ± 746) × 104t / a and accounted for (57 ± 8.2)% of the total output of organic carbon The fluxes from the East China Sea were (2 150 ± 370) × 104 t / a, the organic carbon deposition flux was (1 030 ± 225) × 104 t / a and the organic carbon degradation flux was (737 ± 191) × 104 t / Their contributions accounted for (24 ± 4.1)%, (11 ± 2.5)% and (8.0 ± 2.1)%, respectively, of the total organic carbon output. The estimation of organic carbon budget shows that the organic carbon in the Yellow Sea and the Bohai Sea is dominated by oceanic authigenic sources and has the characteristic of “sink” of potential carbon. The water input and marine organic carbon (1.6 ± 0.3)% are buried in this area Inside.