Circum-Arctic river discharge and its geological record: an introduction

Stein, Ruediger

doi:10.1007/s005310000110

Cited by 56 publications

(27 citation statements)

References 11 publications

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“…Gregory and Chase (1992) stated that from 35 Ma until the last few million years, when deep incision has taken place, this region had a denudation rate less than 0.003 mm year -1 . This is comparable to that reported by Lisitzin (1972) for the Lena River basin of Siberia and has not been appreciably revised by more recent studies (Stein 2000). This is one of the lowest denudation rates for a major river basin, but characteristic of the rivers of the Siberian Arctic.…”

Section: Estimating Paleoaltitude Based On Paleoflorassupporting

confidence: 85%

The Late Cenozoic uplift - climate change paradox

Hay

Söding

DeConto

et al. 2002

International Journal of Earth Sciences

117

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The geologic evidence for worldwide uplift of mountain ranges in the Neogene is ambiguous. Estimates of paleoelevation vary, according to whether they are based on the characteristics of fossil floras, on the masses and grain sizes of eroded sediments, or on calculations of increased thickness of the lithosphere as a result of faulting. Detrital erosion rates can be increased both by increased relief in the drainage basin and by a change to more seasonal rainfall patterns. The geologic record provides no clear answer to the question whether uplift caused the climatic deterioration of the Neogene or whether the changing climate affected the erosion system in such a way as to create an illusion of uplift. We suggest that the spread of C 4 plants in the Late Miocene may have altered both the erosion and climate systems. These changes are responsible for the apparent contradictions between data supporting uplift and those supporting high elevations in the past. A brief historical perspectiveLyell (1830) was impressed by the marked contrast between the conditions required for deposition of the Carboniferous coals as opposed to the present climate. Convinced that the climate of the British Isles had been different in the past, he proposed that the change reflected differences in the global latitudinal distribution of land and sea, arguing that with more extensive land areas in the polar regions, the earth would become cooler, and conversely, with more land in the equatorial regions, the earth would be warmer.

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Section: Estimating Paleoaltitude Based On Paleoflorassupporting

confidence: 85%

The Late Cenozoic uplift - climate change paradox

Hay

Söding

DeConto

et al. 2002

International Journal of Earth Sciences

117

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“…6). This "mean range" is typical for the Buor-Khaya Gulf (Stein, 2000;Stein et al, 2004;Rachold et al, 1999;Mueller-Lupp et al, 2000;Semiletov et al, 1999Semiletov et al, , 2000Dudarev et al, 2006), except for summer 2008 when a strong and light river-borne signal was detected as far north as the Novosibirsky Arc (discussed in detail in companion papers written by Alling et al (2010) and Sánchez-García et al (2011). This is also in agreement with molecular OC data described in the sister paper by Karlsson et al (2011).…”

Section: Sedimentation Regime: Accumulation (Type Ii)supporting

confidence: 77%

“…9). These values are typical for δ 13 C-POC from both the Lena River (Stein, 1998(Stein, , 2000Mueller-Lupp et al, 2000;Rachold et al, 1999, Semiletov, 1999Dudarev et al, 2006a, b, c;Sanchéz-García et al, 2011;Semiletov et al, 2011a) and from eroding ice-complex (Naidu et al, 2000;Mueller-Lupp et al, 2000;Semiletov et al, 2005;Dudarev et al, 2006c). In summertime the dominant source of OC is terrestrial carbon, while the marine biogenic carbon plays a small role in the Laptev Sea shallow oligotrophic waters (Heiskanen et al, 1996, Sorokin andSorokin, 1996).…”

Section: Sources Transport and Distribution Of Organic Matter In Thementioning

confidence: 99%

“…In the Laptev Sea, the annual supply of sedimentary material by coastal erosion is about 58.4 × 10 6 t yr −1 (Stein, et al, 2004) (Table 1). Thus, the sedimentary material of the eastern Laptev Sea coastal zone comes from two major sources: fluvial sediment discharge from the Lena River, and thermal collapse and erosional input from the coastline ice-complex (Stein, 2000;Stein et al, 2004;Rachold et al, 1999;Semiletov et al, 1999Semiletov et al, , 2000Semiletov et al, , 2011aMueller-Lupp et al, 2000;Dudarev et al, 2003, 2006a, b, c, Vonk et al, 2011. In summertime the dominant source of OC is terrestrial carbon, while the marine biogenic carbon plays a small role in the Laptev Sea shallow oligotrophic waters (Heiskanen et al, 1996;Sorokin and Sorokin, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and interannual variability of sedimentation and organic matter distribution in the Buor-Khaya Gulf: the primary recipient of input from Lena River and coastal erosion in the southeast Laptev Sea

et al. 2011

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Abstract. Climate warming is amplified in the land-sea system of the East Siberian Arctic, which also holds large pools of vulnerable carbon in permafrost. This coastal area is strongly influenced by sediment and carbon transport from both its large rivers and extensive erosion of Pleistocene permafrost along its coastline. This study is investigating the coastal fate of the sediment and organic carbon delivered to the Buor-Khaya Gulf, which is the first recipient of the overwhelming fluvial discharge from the Lena River and is additionally receiving large input from extensive erosion of the coastal ice-complex (permafrost a.k.a. Yedoma; loess soil with high organic carbon content). Both water column suspended particulate matter (SPM) and surface sediments were sampled at about 250 oceanographic stations in the Gulf in this multi-year effort, including one winter campaign, and analyzed for the distribution and sorting of sediment size, organic carbon content, and stable carbon isotope signals. The composition of the surface sediment suggests an overwhelmingly terrestrial contribution from both river and coastal erosion. The objective of this paper is to improve our understanding of the seasonal (i.e., winter vs summer) and interannual variability of these coastal sedimentation processes and the dynamics of organic carbon (OC) distribution in both the water column SPM and the surface sediments of the BuorKhaya Gulf.

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“…Riverine waters are not only a critical source for low salinity waters, but they also carry high nutrient loads and fuel biological production (e.g., Smith et al 2003;Trimble & Baskaran 2005). The terrestrial material delivered to the Arctic Ocean by riverine input and coastal erosion either accumulates on the shelf or is transported further offshore by currents or sea ice (e.g., Stein 2000Stein , 2008Wegner et al 2005). Throughout the Holocene, as more of the shelf seas were inundated, formation of shore-fast sea ice and the incorporation of sediments into newly formed sea ice became more widespread.…”

Section: Introductionmentioning

confidence: 99%

Variability in transport of terrigenous material on the shelves and the deep Arctic Ocean during the Holocene

Wegner

Bennett

Vernal³

et al. 2015

Polar Research

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Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-Arctic review that looks into the changing Holocene sources, transport processes and sinks of terrigenous sediment in the Arctic Ocean. Existing palaeoceanographic studies demonstrate how climate warming and the disappearance of ice sheets during the early Holocene initiated eustatic sea-level rise that greatly modified the physiography of the Arctic Ocean. Sedimentation rates over the shelves and slopes were much greater during periods of rapid sea-level rise in the early and middle Holocene, as a result of the relative distance to the terrestrial sediment sources. However, estimates of suspended sediment delivery through major Arctic rivers do not indicate enhanced delivery during this time, which suggests enhanced rates of coastal erosion. The increased supply of terrigenous material to the outer shelves and deep Arctic Ocean in the early and middle Holocene might serve as analogous to forecast changes in the future Arctic.To access the supplementary material for this article, please see supplementary files under Article Tools online.Rapid changes in the environmental conditions of the Arctic have been observed over recent decades. These include decreasing summer and winter sea-ice extent, increasing annual river discharge, increasing areal extent of open-water areas over the Arctic shelves and lengthening of the open-water season Serreze et al. 2007;Kwok et al. 2009;Wagner et al. 2011;Stroeve et al. 2012;Fichot et al. 2013;Zhang et al. 2013). These changes will likely lead to important transformations in sedimentary environments and the pathways and processes of terrigeneous particulate cycling. In particular, they could play a role in sediment resuspension and coastal erosion (e.g., Atkinson 2005;Eicken et al. 2005; Carmack et al. 2006; Anisimov et al. 2007;Lantuit et al. 2012).The impact of increased export of turbid waters from rivers and coastal regions on Arctic marine ecosystems remains uncertain; it could either increase delivery of nutrients and promote productivity or suppress photosynthesis in the light-limited algal populations by scattering absorbing sunlight (Retamal et al. 2008). An adequate understanding of the pathways of terrigenous material is needed to elucidate connections between sediment and ecosystem dynamics under a changing climate. Research efforts assessing recent trends and variability of terrigenous particulate matter inputs into the Arctic Ocean have been carried out during the past decades and discussed in reviews by Rachold et al. (2004), Macdonald et al. (2010), Forbes (2011) and Goñ i et al. (2013). However, the ability to forecast the future significance of land-derived sedimentary inputs into the Arctic Ocean also needs to account for th...

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Circum-Arctic river discharge and its geological record: an introduction

Cited by 56 publications

References 11 publications

The Late Cenozoic uplift - climate change paradox

The Late Cenozoic uplift - climate change paradox

Seasonal and interannual variability of sedimentation and organic matter distribution in the Buor-Khaya Gulf: the primary recipient of input from Lena River and coastal erosion in the southeast Laptev Sea

Variability in transport of terrigenous material on the shelves and the deep Arctic Ocean during the Holocene

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