Variations in organic carbon loading of surface sediments from the shelf to the slope of the Chukchi Sea, Arctic Ocean
-
摘要: 沉积物单位表面积上吸附的有机碳被广泛用于示踪有机碳载荷的变化。本文研究了北冰洋典型边缘海——楚科奇海表层沉积物的有机碳载荷。研究发现陆架区沉积物的有机碳载荷高于陆坡区。相比于已报道的东西伯利亚海和马更些河,楚科奇海陆坡区沉积物的有机碳载荷也较低。这种有机碳载荷的变化可能和陆坡区的初级生产力较低,以及沉积物在传输过程中经历的氧化降解有关。沉积物的有机碳含量和比表面积呈线性相关,在有机碳轴上有正截距,表明一部分有机碳来自于岩石的贡献。此外,陆架区低有机碳载荷的沉积物含有的岩石有机碳更高。本研究的数据有助于深刻理解楚科奇海区域的碳循环问题。Abstract: The content of organic carbon (OC) normalized to the specific surface area (SSA) of sediment is widely used to trace variations in OC loading (OC/SSA). This study presents observations of OC/SSA of surface sediments collected in the Chukchi Sea, a typical Arctic marginal sea. Shelf sediments exhibit much higher OC/SSA values than slope sediments in the study area. Compared with OC/SSA values reported from the East Siberian Shelf and Mackenzie River, the slope sediments possess lower OC loading. This abrupt decrease in OC/SSA is mostly related to the lower primary production on slope as well as possible oxidization processes. The results of linear regression analysis between OC and SSA indicate a sedimentary source rock for the OC in the Chukchi Sea sediments. Moreover, shelf sediments with low SSA possess a larger rock OC fraction than slope sediments do. The dataset of the present study enables a more thorough understanding of regional OC cycling in the Chukchi Sea.
-
Key words:
- Chukchi Sea /
- Arctic /
- surface sediments /
- organic carbon loading /
- carbon cycle
-
Bergamaschi B A, Tsamakis E, Keil R G, et al. 1997. The effect of grain size and surface area on organic matter, lignin and carbohydrate concentration, and molecular compositions in Peru Margin sediments. Geochimica et Cosmochimica Acta, 61(6):1247-1260 Blair N E, Aller R C. 2012. The fate of terrestrial organic carbon in the marine environment. Annual Review of Marine Science, 4(1):401-423 Chen Jianfang, Jin Haiyan, Li Hongliang, et al. 2015. Carbon sink mechanism and processes in the Arctic Ocean under arctic rapid change. Chinese Science Bulletin, 60(35):3406-3416 Chen Jianfang, Zhang Haisheng, Jin Haiyan, et al. 2004. Accumulation of sedimentary organic carbon in the Arctic shelves and its significance on global carbon budget. Chinese Journal of Polar Research (in Chinese), 16(3):193-201 Fahl K, Nöthig E M. 2007. Lithogenic and biogenic particle fluxes on the Lomonosov Ridge (central Arctic Ocean) and their relevance for sediment accumulation:vertical vs. lateral transport. Deep Sea Research Part I:Oceanographic Research Papers, 54(8):1256-1272 Galy V, France-Lanord C, Lartiges B. 2008. Loading and fate of particulate organic carbon from the Himalaya to the Ganga-Brahmaputra delta. Geochimica et Cosmochimica Acta, 72(7):1767-1787 Goericke R, Fry B. 1994. Variations of marine plankton δ13C with latitude, temperature, and dissolved CO2 in the world ocean. Global Biogeochemical Cycles, 8(1):85-90 Goñi M A, O'Connor A E, Kuzyk Z Z, et al. 2013. Distribution and sources of organic matter in surface marine sediments across the North American Arctic margin. Journal of Geophysical Research, 118(9):4017-4035 Goñi M A, Yunker M B, Macdonald R W, et al. 2000. Distribution and sources of organic biomarkers in arctic sediments from the Mackenzie River and Beaufort Shelf. Marine Chemistry, 71(1-2):23-51 Goñi M A, Yunker M B, Macdonald R W, et al. 2005. The supply and preservation of ancient and modern components of organic carbon in the Canadian Beaufort Shelf of the Arctic Ocean. Marine Chemistry, 93(1):53-73 Grebmeier J M, Cooper L W, Feder H M, et al. 2006. Ecosystem dynamics of the Pacific-influenced northern Bering and Chukchi Seas in the Amerasian Arctic. Progress in Oceanography, 71(2-4):331-361 Hedges J I, Keil R G. 1995. Sedimentary organic matter preservation:an assessment and speculative synthesis. Marine Chemistry, 49(2-3):81-115 Hill V, Cota G. 2005. Spatial patterns of primary production on the shelf, slope and basin of the Western Arctic in 2002. Deep Sea Research Part Ⅱ:Topical Studies in Oceanography, 52(24-26):3344-3354 Hwang J, Eglinton T I, Krishfield R A, et al. 2008. Lateral organic carbon supply to the deep Canada Basin. Geophysical Research Letters, 35(11), doi: 10.1029/2008GL034271 Hwang J, Kim M, Manganini S J, et al. 2015. Temporal and spatial variability of particle transport in the deep Arctic Canada Basin. Journal of Geophysical Research, 120(4):2784-2799 Keil R G, Dickens A F, Arnarson T, et al. 2004. What is the oxygen exposure time of laterally transported organic matter along the Washington margin. Marine Chemistry, 92(1-4):157-165 Keil R G, Tsamakis E, Fuh C B, et al. 1994. Mineralogical and textural controls on the organic composition of coastal marine sediments:hydrodynamic separation using SPLITT-fractionation. Geochimica et Cosmochimica Acta, 58(2):879-893 Keil R G, Tsamakis E, Wolf N, et al. 1997. Relationships between organic carbon preservation and mineral surface area in Amazon Fan sediments (Holes 932A and 942A). In:Flood R D, Piper D J W, Klaus A, et al., eds. Proceedings of the Ocean Drilling Program. Scientific Results. College Station, TX:Ocean Drilling Program, 155:531-538 Lasaga A C, Berner R A, Garrels R M. 1985. An improved geochemical model of atmospheric CO2 fluctuations over the past 100 million years. In:Sundquist E T, Broecker W S, eds. The Carbon Cycle and Atmospheric CO2:Natural Variations Archean to Present. Washington:American Geophysical Union, 397-411 Li Hongliang, Chen Jianfang, Liu Zilin, et al. 2007. Size structure of particulate biogenic silica in the Chukchi Sea and the southern Canada basin. Progress in Natural Science (in Chinese), 17(1):72-78 Lin Wuhui, Chen Liqi, Yu Wen, et al. 2016. Burial fluxes of biogenic materials in the bering sea and Chukchi Sea. Chinese Journal of Polar Research (in Chinese), 28(2):194-202 Polyak L, Darby D A, Bischof J F, et al. 2007. Stratigraphic constraints on late Pleistocene glacial erosion and deglaciation of the Chukchi margin, Arctic Ocean. Quaternary Research, 67(2):234-245 Rau G H, Takahashi T, Des Marais D J. 1989. Latitudinal variations in plankton δ13C:implications for CO2 and productivity in past oceans. Nature, 341(6242):516-518 Stein R, Macdonald R W. 2004. Organic carbon budget:arctic Ocean vs. global ocean. In:Stein R, Macdonald R W, eds. The Organic Carbon Cycle in the Arctic Ocean. Berlin Heidelberg:Springer, 315-322 Tao Shuqin, Eglinton T I, Montluçon D B, et al. 2015. Pre-aged soil organic carbon as a major component of the Yellow River suspended load:regional significance and global relevance. Earth and Planetary Science Letters, 414:77-86 Tesi T, Semiletov I, Dudarev O, et al. 2016. Matrix association effects on hydrodynamic sorting and degradation of terrestrial organic matter during cross-shelf transport in the Laptev and East Siberian shelf seas. Journal of Geophysical Research, 121(6):731-752 Vonk J E, Giosan L, Blusztajn J, et al. 2015. Spatial variations in geochemical characteristics of the modern Mackenzie Delta sedimentary system. Geochimica et Cosmochimica Acta, 171:100-120 Vonk J E, Sánchez-García L, van Dongen B E, et al. 2012. Activation of old carbon by erosion of coastal and subsea permafrost in Arctic Siberia. Nature, 489(7414):137-140 Walsh J J, McRoy C P. 1986. Ecosystem analysis in the southeastern Bering Sea. Continental Shelf Research, 5(1-2):259-288 Wang Chunjuan, Liu Yanguang, Dong Linsen, et al. 2015. The distribution pattern of the surface sediments in the bering sea and the western arctic and its environmental implications. Marine Geology & Quaternary Geology (in Chinese), 35(3):1-9 Weingartner T, Aagaard K, Woodgate R, et al. 2005. Circulation on the north central Chukchi Sea shelf. Deep Sea Research Part Ⅱ:Topical Studies in Oceanography, 52(24-26):3150-3174
点击查看大图
计量
- 文章访问数: 1115
- HTML全文浏览量: 59
- PDF下载量: 914
- 被引次数: 0