A post-glacial sea level hinge on the central Pacific coast of Canada

McLaren, Duncan; Fedje, Daryl W.; Hay, Murray B.; Mackie, Quentin; Walker, Ian J.; Shugar, Dan H.; Eamer, Jordan B.R.; Lian, Olav B.; Neudorf, Christina M.

doi:10.1016/j.quascirev.2014.05.023

Cited by 58 publications

(74 citation statements)

References 32 publications

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“…7). McLaren et al (2014) provide substantial new evidence of RSL history on the central coast. Based on more than 100 new radiocarbon ages from Calvert Island and the surrounding region, they argue that the region has experienced relative stability over the past 15 ka and represents a sea level hinge.…”

Section: Northern British Columbiamentioning

confidence: 83%

“…12) (e.g. McLaren et al, 2011McLaren et al, , 2014. It is important to note however, that such a hinge was unlikely static in space or time.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, McLaren et al (2011) argued that the Dundas Island archipelago (Fig. 8) represents the hinge point separating the isostatically depressed mainland and the forebulged outer coast, while McLaren et al 2014 extended the hinge south through the British Columbia central coast (Fig. 12).…”

Section: Northern British Columbiamentioning

confidence: 99%

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Post-glacial sea-level change along the Pacific coast of North America

Shugar

Walker

Lian

et al. 2014

Quaternary Science Reviews

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128

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a b s t r a c tSea-level history since the Last Glacial Maximum on the Pacific margin of North America is complex and heterogeneous owing to regional differences in crustal deformation (neotectonics), changes in global ocean volumes (eustasy) and the depression and rebound of the Earth's crust in response to ice sheets on land (isostasy). At the Last Glacial Maximum, the Cordilleran Ice Sheet depressed the crust over which it formed and created a raised forebulge along peripheral areas offshore. This, combined with different tectonic settings along the coast, resulted in divergent relative sea-level responses during the Holocene. For example, sea level was up to 200 m higher than present in the lower Fraser Valley region of southwest British Columbia, due largely to isostatic depression. At the same time, sea level was 150 m lower than present in Haida Gwaii, on the northern coast of British Columbia, due to the combined effects of the forebulge raising the land and lower eustatic sea level. A forebulge also developed in parts of southeast Alaska resulting in post-glacial sea levels at least 122 m lower than present and possibly as low as 165 m. On the coasts of Washington and Oregon, as well as south-central Alaska, neotectonics and eustasy seem to have played larger roles than isostatic adjustments in controlling relative sea-level changes.

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Section: Northern British Columbiamentioning

confidence: 83%

“…12) (e.g. McLaren et al, 2011McLaren et al, , 2014. It is important to note however, that such a hinge was unlikely static in space or time.…”

Section: Discussionmentioning

confidence: 99%

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Post-glacial sea-level change along the Pacific coast of North America

Shugar

Walker

Lian

et al. 2014

Quaternary Science Reviews

Self Cite

128

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“…Wetland plants are locally abundant including diverse Sphagnum mosses and sedges. Although the watersheds have no history of mining or industrial logging, archaeological evidence suggests that humans have occupied this landscape for at least 13 000 years (McLaren et al, 2014). This occupation has had a local effect on forest productivity near habitation sites (Trant et al, 2016) and on fire regimes .…”

Section: Study Sitesmentioning

confidence: 99%

A global hotspot for dissolved organic carbon in hypermaritime watersheds of coastal British Columbia

et al. 2017

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Abstract. The perhumid region of the coastal temperate rainforest (CTR) of Pacific North America is one of the wettest places on Earth and contains numerous small catchments that discharge freshwater and high concentrations of dissolved organic carbon (DOC) directly to the coastal ocean. However, empirical data on the flux and composition of DOC exported from these watersheds are scarce. We established monitoring stations at the outlets of seven catchments on Calvert and Hecate islands, British Columbia, which represent the rain-dominated hypermaritime region of the perhumid CTR. Over several years, we measured stream discharge, stream water DOC concentration, and stream water dissolved organic-matter (DOM) composition. Discharge and DOC concentrations were used to calculate DOC fluxes and yields, and DOM composition was characterized using absorbance and fluorescence spectroscopy with parallel factor analysis (PARAFAC). The areal estimate of annual DOC yield in water year 2015 was 33.3 Mg C km −2 yr −1 , with individual watersheds ranging from an average of 24.1 to 37.7 Mg C km −2 yr −1 . This represents some of the highest DOC yields to be measured at the coastal margin. We observed seasonality in the quantity and composition of exports, with the majority of DOC export occurring during the extended wet period (September-April). Stream flow from catchments reacted quickly to rain inputs, resulting in rapid export of relatively fresh, highly terrestrial-like DOM. DOC concentration and measures of DOM composition were related to stream discharge and stream temperature and correlated with watershed attributes, including the extent of lakes and wetlands, and the thickness of organic and mineral soil horizons. Our discovery of high DOC yields from these small catchments in the CTR is especially compelling as they deliver relatively fresh, highly terrestrial organic matter directly to the coastal ocean. Hypermaritime landscapes are common on the British Columbia coast, suggesting that this coastal margin may play an important role in the regional processing of carbon and in linking terrestrial carbon to marine ecosystems.

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“…Recent research on the central coast of British Columbia (BC), Canada, suggests that it has a unique postglacial history as sea level has remained remarkably stable since deglaciation and archaeological evidence exists for continuous human occupation for at least the last 10,000 years McLaren et al, 2014). Calvert Island, located south of Hakai Pass, hosts a variety of coastal landforms including bluff-and dune-backed embayed beaches, tombolos, and stabilized dune complexes that contain important records of environmental change, landscape evolution, and human occupation during postglacial time.…”

Section: Introductionmentioning

confidence: 99%