Distribution of humic substances dissolved and particulated in water column in Ross Sea, Antarctica

详细信息    查看全文

• 作者：Nicoletta Calace ; Andrea Casagr ; e ; Sabrina Mirante ; Bianca Maria Petronio ; Marco Pietroletti
• 关键词：Humic substances ; Seawaters ; Antarctica
• 刊名：Microchemical Journal
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：96
• 期：2
• 页码：218-224
• 全文大小：735 K

文摘

Dissolved (DFA) and particulate (PFA) fulvic acids were studied in some areas of the Ross Sea (Antarctica) characterised by different water masses. Our interest was focused on their distribution in the water column. Moreover, their correlation with fluorescence data and structural characterisation in relation to the water masses was also studied. We found that PFA concentration was mainly influenced by the primary production in surface layers and by stratification of water masses along the water column. Conversely, the DFA are less influenced by primary production and by the stratification of the water masses. An early stage of the humification process can be hypothesised for PFA related to DFA as shown by elemental analyses and spectroscopic data. PFA collected in the bottom depths of the water column showed a relationship with age of water mass (the highest concentration was found for the oldest circulating water mass (CDW)). This relationship was not observed for DFA. Moreover, any significant difference in structure was found in the DFA and PFA extracted from samples collected at bottom depths.