Observations on seasonal variations of colored dissolved organic matter (CDOM) subsurface maximum in the Mediterranean Sea
-
摘要: 首次通过2008—2009年在西北地中海和东地中海海域投放的两台Bio-Argo浮标的观测数据,分析与研究了该海区黄色物质次表层极大值的季节变化规律。研究表明次表层黄色物质在夏季开始爆发,伴随着叶绿素a浓度的逐渐降低;到冬季在强烈的垂向混合作用下结束。且黄色物质极大值的深度与叶绿素a浓度极大值(DCM)的深度基本一致,说明虽然黄色物质与浮游植物之间并不存在直接联系,但浮游植物的降解是黄色物质的主要来源。文中推测,可能由于该海区浮游植物与微生物的强耦合,导致了黄色物质与叶绿素a之间存在明显的反变关系。Abstract: Based on the in situ dataset observed by two Bio-Argo floats deployed in the northwestern and eastern basins of Mediterranean Sea in 2008-2009, this study focuses on the seasonal variations of colored dissolved organic matter (CDOM) subsurface maximum. The research results show that the subsurface CDOM bloom started in summer accompanied by gradual decreasing of chlorophyll-a concentration, and disappeared in winter owing to deep mixing effect. In addition, the depth of subsurface CDOM maximum was always following the depth of deep chlorophyll-a maximum (DCM) during the CDOM bloom period, which suggests that the source of oceanic CDOM is almost certainly the result of phytoplankton degradation, although chlorophyll and CDOM are not correlated directly. It is assumed that a probable strong coupling between phytoplankton and bacteria leads to the obvious contravariance observed between CDOM and chlorophyll-a.
-
Kalle K. Zum problem der meerwasserfarbe[J]. Ann Hydrol Mar mitteilungen, 1938, 66: 1—13. Shifrin K S. Physical Optics of Ocean Water (D. Oliver, translator) [M]. American Institute of Physics, New York, 1988. Siegel D A, Michaels A F, Sorensen J C, et al. Seasonal variability of light availability and its utilization in the Sargasso Sea[J]. J Geophys Res, 1995, 100: 8695—8713. Siegel D A, MichaelS A F. Quantification of non-algal light attenuation in the Sargasso Sea: Implications for biogeochemistry and remote sensing [J]. Deep-Sea Res Ⅱ, 1996, 43: 321—345. Nelson N B, Siegel D A, Michaels A F. Seasonal dynamics of colored dissolved material in the Sargasso Sea[J]. Deep-Sea Res Ⅰ, 1998, 45: 931—957. Nelson N B, Siegel D A. Chromophoric DOM in the open ocean [M]//Hansell D A, Carlson C A. Biogeochemistry of Marine Dissolved Organic Matter. San Diego, CA:Academic Press, 2002:547—578. Siegel D A, Maritorena S, Nelson N B, et al. Global distribution and dynamics of colored dissolved and detrital organic materials[J]. Journal of Geophysical Research, 2002, 107: 3228, doi: 10.1029/2001JC000965. Coble P G. Marine optical biogeochemistry: the chemistry of ocean color[J]. Chemical Reviews, 2007, 107: 402—418. Morel A, Gentili B. A simple band ratio technique to quantify the colored dissolved and detrital organic material from ocean color remotely sensed data [J]. Remote Sens Environ, 2009, 113: 998—1011. Swan C M, Siegel D A, Nelson N B, et al. Biogeochemical and hydrographic controls on chromophoric dissolved organic matter distribution in the Pacific Ocean[J]. Deep-Sea Res Ⅰ, 2009, 56: 2175—2192. Zepp R G. Solar ultraviolet radiation and aquatic carbon, nitrogen, sulfur and metals cycles[M]//Helbling E W, Zagarese H. UV Effects in Aquatic Organisms and Ecosystems. Cambridge UK:Royal Society of Chemistry, 2002: 137—183. Chen R F, Bada J L. The fluorescence of dissolved organic matter in seawater[J]. Mar Chem, 1992, 37: 191—221. Hayase K, Shinozuka N. Vertical distribution of fluorescent organic matter along with AOU and nutrients in the equatorial Central Pacific[J]. Man Chem,1995, 48: 283—290. Sasaki H, Miyamura T, Saitoh S, et al. Seasonal variation of absorption by particles and colored dissolved organic matter (CDOM) in Funka Bay, southwestern Hokkaido, Japan[J]. Estuarine, Coastal and Shelf Science, 2005, 64: 447—458. Rochelle-Newall E J, Fisher T R. Production of chromophoric dissolved organic matter fluorescence in marine and estuarine environments: an investigation into the role of phytoplankton[J]. Mar Chem, 2002, 77: 7—21. Hu C, Lee Z, Muller-Karger F E, et al. Ocean color reveals phase shift between marine plants and yellow substance[J]. IEEE Geoscience and Remote Sensing Letters, 2006, 3: 262—266. Claustre H. IOCCG report N°11: Bio-Optical sensors on Argo floats[M]. Dartmouth: International Ocean-Color Coordinating Group, 2011. 邢小罡, 赵冬至, Hervé Claustre,等. 一种新的海洋生物地球化学自主观测平台:Bio-Argo浮标[J]. 海洋环境科学, 2012, 31:733—739. Xing X, Morel A, Claustre H, et al. Combined processing and mutual interpretation of radiometry and fluorimetry from autonomous profiling Bio-Argo floats: Chlorophyll a retrieval[J]. Journal of Geophysical Research, 2011, 116:C06020, doi: 10.1029/2010JC006899. Xing X, Morel A, Claustre H, et al. Combined processing and mutual interpretation of radiometry and fluorometry from autonomous profiling Bio-Argo floats: 2. Colored dissolved organic matter absorption retrieval[J]. Journal of Geophysical Research, 2012, 117:C04022. doi: 10.1029/2011JC007632. Nelson N B, Siegel D A, Carlson C A, et al. Hydrography of chromophoric dissolved organic matter in the North Atlantic[J]. Deep-Sea Res Ⅰ, 2007, 54: 710—731. Morel A, Gentili B. The dissolved yellow substance and the shades of blue in the Mediterranean Sea[J]. Biogeosciences, 2009, 6: 2625—2636. Cullen J J. The deep chlorophyll maximum: comparing vertical profiles of chlorophyll-a[J]. Can J Fish Aquat Sci, 1982, 9: 791—803. Coble P, Del Castillo C, Avril B.Distribution and optical properties of CDOM in the Arabian Sea during the 1995 Southwest Monsoon[J]. Deep-Sea Res Ⅱ,1998, 45: 2195—2223.
点击查看大图
计量
- 文章访问数: 1531
- HTML全文浏览量: 12
- PDF下载量: 1022
- 被引次数: 0