DOI: 10.1002/2016GB005569
Scopus记录号: 2-s2.0-85023157942
论文题名: Controls on the distribution of fluorescent dissolved organic matter during an under-ice algal bloom in the western Arctic Ocean
作者: Mendoza W ; G ; , Weiss E ; L ; , Schieber B ; , Greg Mitchell B
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 7 起始页码: 1118
结束页码: 1140
语种: 英语
英文关键词: Arctic Ocean
; fluorescent dissolved organic matter
; PARAFAC
; self-organizing map
Scopus关键词: algal bloom
; artificial neural network
; biogeochemistry
; decomposition analysis
; dissolved organic matter
; fluorescence
; humic substance
; hydrograph
; meteoric water
; microbial activity
; mixed layer
; phytoplankton
; protein
; sea ice
; spatial distribution
; spectroscopy
; water mass
; Arctic Ocean
; Beaufort Sea
; Chukchi Sea
; Pacific Ocean
; algae
英文摘要: In this study we used fluorescence excitation and emission matrix spectroscopy, hydrographic data, and a self-organizing map (SOM) analysis to assess the spatial distribution of labile and refractory fluorescent dissolved organic matter (FDOM) for the Chukchi and Beaufort Seas at the time of a massive under-ice phytoplankton bloom during early summer 2011. Biogeochemical properties were assessed through decomposition of water property classes and sample classification that employed a SOM neural network-based analysis which classified 10 clusters from 269 samples and 17 variables. The terrestrial, humic-like component FDOM (ArC1, 4.98 ± 1.54 Quinine Sulfate Units (QSU)) and protein-like component FDOM (ArC3, 1.63 ± 0.88 QSU) were found to have elevated fluorescence in the Lower Polar Mixed Layer (LPML) (salinity ~29.56 ± 0.76). In the LPML water mass, the observed contribution of meteoric water fraction was 17%, relative to a 12% contribution from the sea ice melt fraction. The labile ArC3-protein-like component (2.01 ± 1.92 QSU) was also observed to be elevated in the Pacific Winter Waters mass, where the under-ice algal bloom was observed (~40–50 m). We interpreted these relationships to indicate that the accumulation and variable distribution of the protein-like component on the shelf could be influenced directly by sea ice melt, transport, and mixing processes and indirectly by the in situ algal bloom and microbial activity. ArC5, corresponding to what is commonly considered marine humic FDOM, indicated a bimodal distribution with high values in both the freshest and saltiest waters. The association of ArC5 with deep, dense salty water is consistent with this component as refractory humic-like FDOM, whereas our evidence of a terrestrial origin challenges this classic paradigm for this component. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77718
Appears in Collections: 气候变化事实与影响
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Atlantic Ecology Division, NHEERL, U.S. Environmental Protection Agency, Narragansett, RI, United States
Recommended Citation:
Mendoza W,G,, Weiss E,et al. Controls on the distribution of fluorescent dissolved organic matter during an under-ice algal bloom in the western Arctic Ocean[J]. Global Biogeochemical Cycles,2017-01-01,31(7)