Distribution of dissolved organic matter in the eastern Bering Sea, Chukchi Sea (Barrow Canyon) and Beaufort Sea

Abstract

[1] The distribution of dissolved organic carbon (DOC) in the western Arctic Ocean is greatly influenced by conservative riverine DOC flux into the northern Bering Sea, Bering Strait and Beaufort Sea, as indicated by an inverse correlation with salinity. Based on the relations between DOC, salinity and seawater temperature, several water masses could be identified. These included riverine water, ice-melt water, surface mixed water, cold and saline shelf water, and Atlantic Ocean water. High concentrations of chlorophyll a and DOC were found in some parcels of dense shelf water in Barrow Canyon. In addition, labile DOC compounds, such as polyunsaturated fatty acids (PUFA), were found in the dense shelf water, suggesting the dense shelf water contains a product (marine organic matter) of the biological CO 2 pump.

Riverine export and the effects of circulation on dissolved organic carbon in the Hudson Bay system, Canada

“…The zero salinity intercepts from FB and eastern HB surface water DOC-salinity relationships allowed the inference of a DOC ice melt end member that ranged between 45 and 61 mmol L 21 . This ice melt dilution effect agrees with recent studies (Shin and Tanaka 2004;Mathis et al 2007); however, it is contrary to previous studies that suggest a potential increase of surface DOC to be associated with sea ice melt (Smith et al 1997;Scully and Miller 2000;Anderson 2002). The opposing concentrating and diluting influence of sea ice melt in the literature can be explained through sea ice desalination processes.…”

DOM in the Arctic Ocean

“…This value agrees with the range observed in the same region at the salinity range of the Bering Strait inflow (S = 32-34) (Hansell et al, 2004). Shin and Tanaka (2004) showed a close DOC-salinity relationship in the Bering Strait inflow water with the linear correlation: DOC = −15.17 × S + 556. However, this relationship is only valid up to a salinity of about 32.5, which is on the low end of the mean salinity of the inflow.…”

“…High DOC concentrations have been found in parts of the upper halocline north of the Chukchi Sea (Shin and Tanaka, 2004), coinciding with high nutrient and low oxygen concentrations, signatures of organic matter decay at the shelf sediment surface. This excess DOC likely is supplied from the sediment surface as a result of organic matter mineralization, with the organic matter potentially having both terrestrial and marine sources.…”

Carbon Dioxide and Methane Dynamics in Estuaries

“…), based on Borges and Frankignoulle (2002aFrankignoulle ( , 2002bFrankignoulle ( , 2002c , Bouillon et al (2003), Cai et al (2003), Chavez and Messié (2009), Cloern and Jassby (2008), Frankignoulle et al (1998Frankignoulle et al ( , 1996, Frankignoulle and Borges (2001), Abril et al (2002), Friederich et al (2002Friederich et al ( , 2008, García-Muñoza et al (2005), Goyet et al (1998), Kulin ski and Pempkowiak (2008), Okkonen et al (2004), Raimbault et al (2007), Shin and Tanaka (2004).…”