scholarly journals Increasing dominance of terrigenous organic matter in circumpolar freshwaters due to permafrost thaw

2018 ◽  
Vol 3 (3) ◽  
pp. 186-198 ◽  
Author(s):  
Maxime Wauthy ◽  
Milla Rautio ◽  
Kirsten S. Christoffersen ◽  
Laura Forsström ◽  
Isabelle Laurion ◽  
...  
Keyword(s):  
Organic Matter ◽  
Permafrost Thaw ◽  
Terrigenous Organic Matter

Sources and distributions of terrigenous organic matter in a mangrove fringed small tropical estuary in South China

2013 ◽  
Vol 32 (4) ◽  
pp. 18-26 ◽  
Author(s):  
Hongyan Bao ◽  
Ying Wu ◽  
Lixin Tian ◽  
Jing Zhang ◽  
Guiling Zhang
Keyword(s):  
Organic Matter ◽  
South China ◽  
Tropical Estuary ◽  
Terrigenous Organic Matter

Composition and provenance of terrigenous organic matter transported along submarine canyons in the Gulf of Lion (NW Mediterranean Sea)

2013 ◽  
Vol 118 ◽  
pp. 81-94 ◽  
Author(s):  
Catalina Pasqual ◽  
Miguel A. Goñi ◽  
Tommaso Tesi ◽  
Anna Sanchez-Vidal ◽  
Antoni Calafat ◽  
...  
Keyword(s):  
Organic Matter ◽  
Mediterranean Sea ◽  
Submarine Canyons ◽  
Terrigenous Organic Matter ◽  
Gulf Of Lion ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

scholarly journals Supplementary material to "Organic matter across subsea permafrost thaw horizons on the East Siberian Arctic Shelf"

2018 ◽  
Author(s):  
Birgit Wild ◽  
Natalia Shakhova ◽  
Oleg Dudarev ◽  
Alexey Ruban ◽  
Denis Kosmach ◽  
...  
Keyword(s):  
Organic Matter ◽  
Arctic Shelf ◽  
Permafrost Thaw ◽  
Siberian Arctic ◽  
Supplementary Material ◽  
Subsea Permafrost

scholarly journals Reviews and Syntheses: Effects of permafrost thaw on arctic aquatic ecosystems

2015 ◽  
Vol 12 (13) ◽  
pp. 10719-10815 ◽  
Author(s):  
J. E. Vonk ◽  
S. E. Tank ◽  
W. B. Bowden ◽  
I. Laurion ◽  
W. F. Vincent ◽  
...  
Keyword(s):  
Organic Matter ◽  
Aquatic Ecosystems ◽  
Soil Layer ◽  
Freshwater Ecosystems ◽  
The Arctic ◽  
Food Web Structure ◽  
Thermokarst Lakes ◽  
Freshwater Systems ◽  
Permafrost Thaw ◽  
Lake Morphology

Abstract. The Arctic is a water-rich region, with freshwater systems covering 16 % of the northern permafrost landscape. The thawing of this permafrost creates new freshwater ecosystems, while at the same time modifying the existing lakes, streams, and rivers that are impacted by thaw. Here, we describe the current state of knowledge regarding how permafrost thaw affects lentic and lotic systems, exploring the effects of both thermokarst (thawing and collapse of ice-rich permafrost) and deepening of the active layer (the surface soil layer that thaws and refreezes each year). Within thermokarst, we further differentiate between the effects of thermokarst in lowland areas, vs. that on hillslopes. For almost all of the processes that we explore, the effects of thaw vary regionally, and between lake and stream systems. Much of this regional variation is caused by differences in ground ice content, topography, soil type, and permafrost coverage. Together, these modifying variables determine the degree to which permafrost thaw manifests as thermokarst, whether thermokarst leads to slumping or the formation of thermokarst lakes, and the manner in which constituent delivery to freshwater systems is altered by thaw. Differences in thaw-enabled constituent delivery can be considerable, with these modifying variables determining, for example, the balance between delivery of particulate vs. dissolved constituents, and inorganic vs. organic materials. Changes in the composition of thaw-impacted waters, coupled with changes in lake morphology, can strongly affect the physical and optical properties of thermokarst lakes. The ecology of thaw-impacted systems is also likely to change, with thaw-impacted lakes and streams having unique microbiological communities, and showing differences in respiration, primary production, and food web structure that are largely driven by differences in sediment, dissolved organic matter and nutrient delivery. The degree to which thaw enables the delivery of dissolved vs. particulate organic matter, coupled with the composition of that organic matter and the morphology and stratification characteristics of recipient systems will play an important role in determining the balance between the release of organic matter as greenhouse gases (CO2 and CH4), its burial in sediments, and its loss downstream. The magnitude of thaw impacts on northern aquatic ecosystems is increasing, as is the prevalence of thaw-impacted lakes and streams. There is therefore an urgent need to address the key gaps in understanding in order to predict the full effects of permafrost thaw on aquatic ecosystems throughout the Arctic, and their consequential feedbacks to climate.

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