Comparison of the optical properties of dissolved organic matter in two river-influenced coastal regions of the Canadian Arctic

Retamal, Leira; Vincent, Warwick F.; Martineau, Christine; Osburn, Christopher L.

doi:10.1016/j.ecss.2006.10.022

Cited by 97 publications

(58 citation statements)

References 47 publications

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“…The presence of high concentrations of CDOM following the period of heavy rain is likely to derive from the leaching of organic matter from the mature forests and grasslands that cover the adjacent land area, much of which is protected within nature reserves and/or is pristine. Significant CDOM levels have also been observed in New Zealand fjords (Gonsior et al 2008) and Arctic rivers (Retamal et al 2007), with similar characteristics to this region of Chile, but have not been previously reported within the Laguna San Rafael area. Because the estuarine water in this region tends to have high turbidity, either due to high concentrations of suspended fine particulate matter of glacial origin (rock flour) close to Laguna San Rafael or sediment from the Aysé n River, salinity is strongly anticorrelated with turbidity and CDOM in this section.…”

Section: A Spring Campaignsupporting

confidence: 80%

Ship-of-Opportunity Monitoring of the Chilean Fjords Using the Pocket FerryBox

Aiken

Petersen

Schroeder

et al. 2011

Journal of Atmospheric and Oceanic Technology

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Results from two field campaigns in the Chilean fjords region are presented to demonstrate the benefits and limitations of the ''pocket FerryBox'' for monitoring from ships of opportunity. The October 2009 (spring) campaign covered the region of the Chilean coast between 41.58 and 46.78S, and that in March 2010 (autumn) covered the region between 41.58 and 51.88S. In the campaigns the pocket FerryBox-a portable flow-through system for underway multiparametric monitoring-was installed temporarily on board the vessel M/V Ro-Ro Evangelistas. The taking of water samples allowed posterior calibration of the sensors and analyses for nutrients and plankton. The pocket FerryBox may be configured with multiple sensors [in this case temperature, salinity, dissolved oxygen, chlorophyll-a fluorescence, pH, turbidity, and colored dissolved organic matter (CDOM)] and includes the hardware and software for data acquisition and real-time presentation. In the Chilean campaigns multiple transects of up to 1700 km in length were obtained, which provided a unique and highly valuable dataset at a very low cost. The data uncovered a number of previously unreported results, including a tidally driven low dissolved oxygen zone in the Corcovado Gulf, a high level of spatial and temporal variability of, and a complex relationship between, dissolved oxygen and chlorophyll-a fluorescence, and the detection of high concentrations of CDOM in the vicinity of the Laguna San Rafael. The campaigns confirm that the pocket FerryBox may be easily installed on board ships of opportunity to obtain rapid, lowcost, and spatially extensive surveys of highly relevant surface water properties.

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Section: A Spring Campaignsupporting

confidence: 80%

Ship-of-Opportunity Monitoring of the Chilean Fjords Using the Pocket FerryBox

Aiken

Petersen

Schroeder

et al. 2011

Journal of Atmospheric and Oceanic Technology

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“…Mean spectral slopes of the absorption coefficients are available for the Great Whale River and Mackenzie River in the Canadian Arctic (Retamal et al, 2007) at 0.016 and 0.0185 m −1 , respectively. However, they were derived from the wavelength range 300-650 nm with a reference wavelength of 320 nm.…”

Section: Discussionmentioning

confidence: 99%

Contribution to a bio-optical model for remote sensing of Lena River water

et al. 2013

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Abstract. Bio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, during the period of maximum runoff. This aimed to contribute to the development of a biooptical model for use as the basis for optical remote sensing of coastal water of the Arctic. In this context the absorption by CDOM (colored dissolved organic matter) and particles, and the concentrations of total suspended matter, phytoplankton-pigments, and carbon were measured. CDOM was found to be the most dominant parameter affecting the optical properties of the river, with an absorption coefficient of 4.5-5 m −1 at 442 nm, which was almost four times higher than total particle absorption values at visible wavelength range. The wavelenght-dependence of absorption of the different water constituents was chracterized by determining the semi logarithmic spectral slope. Mean CDOM, and detritus slopes were 0.0149 nm −1 (standard deviation (stdev) = 0.0003, n = 18), and 0.0057 nm −1 (stdev = 0.0017, n = 19), respectively, values which are typical for water bodies with high concentrations of dissolved and particulate carbon. Mean chlorophyll a and total suspended matter were 1.8 mg m −3 (stdev = 0.734 n = 18) and 31.9 g m −3 (stdev = 19.94, n = 27), respectively. DOC (dissolved organic carbon) was in the range 8-10 g m −3 and the total particulate carbon (PC) in the range 0.25-1.5 g m −3 . The light penetration depth (Secchi disc depth) was in the range 30-90 cm and was highly correlated with the suspended matter concentration. The period of maximum river runoff in June was chosen to obtain bio-optical data when maximum water constituents are transported into the Laptev Sea. However, we are aware that more data from other seasons and other years need to be collected to establish a general bio-optical model of the Lena water and conclusively characterize the light climate with respect to primary production.

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“…We could thus expect efficient metabolizers of CDOM, such as representatives of the Cytophaga-Flavobacterium cluster (Kirchman 2002), to make up a substantial share of the winter bacterial community at intermediate depths in the southeastern Beaufort Sea. A study of the phylogenetic composition of the bacterioplankton in autumn on the Mackenzie Shelf revealed the widespread distribution of this group (Garneau et al 2006) over this CDOM-laden region strongly influenced by the Mackenzie River (Retamal et al 2007). Sala et al (2008) described a markedly high bacterial metabolic diversity in the winter assemblages of Franklin Bay compared to spring-summer, suggesting that the former are capable of exploiting a broad array of complex carbon sources beneath the ice.…”

Section: The Winter Microbial Food Webmentioning

confidence: 99%

Current state and trends in Canadian Arctic marine ecosystems: II. Heterotrophic food web, pelagic-benthic coupling, and biodiversity

et al. 2012

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As part of the Canadian contribution to the International Polar Year (IPY), several major international research programs have focused on offshore arctic marine ecosystems. The general goal of these projects was to improve our understanding of how the response of arctic marine ecosystems to climate warming will alter food web structure and ecosystem services provided to Northerners. At least four key findings from these projects relating to arctic heterotrophic food web, pelagic-benthic coupling and biodiversity have emerged: (1) Contrary to a long-standing paradigm of dormant ecosystems during the long arctic winter, major food web components showed relatively high level of winter activity, well before the spring release of ice algae and subsequent phytoplankton bloom. Such phenological plasticity among key secondary producers like zooplankton may thus narrow the risks of Climatic Change

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Comparison of the optical properties of dissolved organic matter in two river-influenced coastal regions of the Canadian Arctic

Cited by 97 publications

References 47 publications

Ship-of-Opportunity Monitoring of the Chilean Fjords Using the Pocket FerryBox

Ship-of-Opportunity Monitoring of the Chilean Fjords Using the Pocket FerryBox

Contribution to a bio-optical model for remote sensing of Lena River water

Current state and trends in Canadian Arctic marine ecosystems: II. Heterotrophic food web, pelagic-benthic coupling, and biodiversity

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