DOI: 10.1002/2015GB005200
Scopus记录号: 2-s2.0-84955253501
论文题名: Low particulate carbon to nitrogen ratios in marine surface waters of the Arctic
作者: Crawford D ; W ; , Wyatt S ; N ; , Wrohan I ; A ; , Cefarelli A ; O ; , Giesbrecht K ; E ; , Kelly B ; , Varela D ; E
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 12 起始页码: 2021
结束页码: 2033
语种: 英语
英文关键词: Arctic
; C:N ratios
; particulates
; phytoplankton
; Redfield ratios
; uptake rates
Scopus关键词: bacterioplankton
; biogeochemical cycle
; carbon isotope
; concentration (composition)
; euphotic zone
; isotopic ratio
; marine environment
; nitrogen isotope
; nutrient uptake
; particulate organic carbon
; phytoplankton
; picoplankton
; primary production
; Redfield ratio
; surface water
; Arctic Ocean
; Beaufort Sea
; Canada Basin
; Mastigophora (flagellates)
英文摘要: During the Canada's Three Oceans and Joint Ocean Ice Study projects in the summers of 2007 and 2008, we measured particulate organic carbon to nitrogen ratios (POC:PON) throughout the euphotic zone in Subarctic and Arctic waters. Average depth-integrated values (2.65 ± 0.19) in the Beaufort Sea and Canada Basin (BS-CB domain) were much lower than both the Redfield ratio (6.6) and the average ratios (3.9 to 5.6) measured across other Arctic-Subarctic domains. Average uptake ratios of C and N (ρC:ρN) were also lower (0.87 ± 0.14) in BS-CB than in the other four domains (2.10 to 3.51). Decreasing POC:PON ratios were associated with low concentrations of phytoplankton C, reduced abundance of biogenic silica (bSiO2), a smaller relative contribution of the >5 μm fraction to total chlorophyll a and a larger relative contribution of small flagellates (<8 μm) to total phytoplankton C. In the subsurface chlorophyll a maximum (SCM) within the BS-CB domain, phytoplankton C represented only ~13% of POC; and therefore, the presence of heterotrophic microbes may have decreased POC:PON. These ratios are supported by data obtained during other Arctic programs in 2006, 2008, and 2009. Previous work has suggested a link between freshening of surface waters and increasing dominance of picophytoplankton and bacterioplankton in the Canada Basin, and the low POC:PON ratios measured during this study may be a consequence of this shift. Our results have ramifications for the conversion between C- and N-based estimates of primary productivity, and for biogeochemical modeling of marine Arctic waters. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77900
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Biology, University of Victoria, Victoria, BC, Canada; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Divisiõn Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de la Plata, La Plata, Argentina
Recommended Citation:
Crawford D,W,, Wyatt S,et al. Low particulate carbon to nitrogen ratios in marine surface waters of the Arctic[J]. Global Biogeochemical Cycles,2015-01-01,29(12)