Direct evidence of the feedback between climate and weathering

Gíslason, Sigurður R.; Oelkers, Eric H.; Eiríksdóttir, Eydís Salome; Kardjilov, M. I.; Gísladóttir, Guðrún; Sigfússon, Bergur; Snorrason, Árni; Elefsen, S.; Harðardóttir, Jórunn; Torssander, Peter; Öskarsson, N.

doi:10.1016/j.epsl.2008.10.018

Cited by 334 publications

(218 citation statements)

References 39 publications

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“…A direct relationship was highlighted by Gislason et al (2009) between river discharge and mechanical weathering of Icelandic basaltic rocks that have a high Li content. Consequently, Thébault et al (2009b) hypothesized that high loads of Li-rich suspended basaltic particles probably flow to the sea with Icelandic rivers as soon as snow melts.…”

Section: Weathered Li-rich Particlesmentioning

confidence: 99%

Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms

Thébault

Chauvaud

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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To cite this version:Julien Thébault, Laurent Chauvaud. Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms. Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2012, 373, pp.108-122. <10.1016/j.palaeo.2011 AbstractPhytoplankton dynamics in coastal oceans is a major component of the global biogeochemical carbon cycle, and is currently affected by global change through modifications in levels of primary productivity and composition of phytoplankton communities. Despite many attempts, no straightforward geochemical proxy has been found yet in marine biogenic carbonates for reconstruction of past phytoplankton dynamics with high temporal resolution. Here, we report on subweekly variations of lithium-to-calcium ratios (Li/Ca shell ) along the axis of maximum growth of great scallop shells ( Comparison of these results with shell growth measurements (increment width) and environmental parameters suggests (i) that shell calcification rate is likely the main factor controlling incorporation of Li in Pecten maximus shell calcite, (ii) that seawater temperature has only a weak positive influence on Li/Ca shell of this species over the range 8-18°C, and (iii) that during diatom blooms, additional amounts of Li may be trapped in the shell following dissolution of Li-rich frustules of edible species in the digestive tract of scallops, being responsible for Li/Ca shell peaks. Therefore, we suggest that Li/Ca shell ratio may be a novel proxy for timing and magnitude of diatom blooms in coastal ecosystems. Analysis of ancient shells may thus provide useful information on past phytoplankton dynamics and on the importance of recent shifts observed from diatoms to non-siliceous phytoplankton in coastal areas affected by anthropogenic activities.

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Section: Weathered Li-rich Particlesmentioning

confidence: 99%

Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms

Thébault

Chauvaud

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…1c). Furthermore, increased chemical weathering of continental surfaces caused by human-induced climate change and increased CO 2 levels contributes to the enhanced riverine export flux of C derived from rock weathering 82,83 (F 2 ). The anthropogenic perturbation could possibly reach 0.1 Pg C yr -1 , mainly through enhanced dissolution of carbonate rocks 83 .…”

Section: Anthropogenic Perturbation Of Lateral Carbon Fluxesmentioning

confidence: 99%

Anthropogenic perturbation of the carbon fluxes from land to ocean

et al. 2013

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A substantial amount of the atmospheric carbon taken up on land through photosynthesis and chemical weathering is transported laterally along the aquatic continuum from upland terrestrial ecosystems to the ocean. So far, global carbon budget estimates have implicitly assumed that the transformation and lateral transport of carbon along this aquatic continuum has remained unchanged since pre-industrial times. A synthesis of published work reveals the magnitude of present-day lateral carbon fluxes from land to ocean, and the extent to which human activities have altered these fluxes. We show that anthropogenic perturbation may have increased the flux of carbon to inland waters by as much as 1.0 Pg C yr(-1) since pre-industrial times, mainly owing to enhanced carbon export from soils. Most of this additional carbon input to upstream rivers is either emitted back to the atmosphere as carbon dioxide (similar to 0.4 Pg C yr(-1)) or sequestered in sediments (similar to 0.5 Pg C yr(-1)) along the continuum of freshwater bodies, estuaries and coastal waters, leaving only a perturbation carbon input of similar to 0.1 Pg C yr(-1) to the open ocean. According to our analysis, terrestrial ecosystems store similar to 0.9 Pg C yr(-1) at present, which is in agreement with results from forest inventories but significantly differs from the figure of 1.5 Pg C yr(-1) previously estimated when ignoring changes in lateral carbon fluxes. We suggest that carbon fluxes along the land-ocean aquatic continuum need to be included in global carbon dioxide budgets

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“…Soil temperature has a direct relationship with decomposition of organic matter and soil respiration (Leirós et al, 1999). Considering its significant contribution in soil weathering process, soil temperature regime has been included as classification criteria in the Soil Taxonomy (Gislason et al, 2009;Soil Survey Staff, 1999).…”

Section: Introductionmentioning

confidence: 99%

Soil temperature prediction from air temperature for alluvial soils in lower Indo-Gangetic plain

Barman¹,

Kundu²,

Pal³

et al. 2017

International Agrophysics

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A b s t r a c t. Soil temperature is an important factor in biogeochemical processes. On-site monitoring of soil temperature is limited in spatio-temporal scale as compared to air temperature data inventories due to various management difficulties. Therefore, empirical models were developed by taking 30-year long-term (1985-2014) air and soil temperature data for prediction of soil temperatures at three depths (5, 15, 30 cm) in morning (0636 Indian standard time) and afternoon (1336 Indian standard time) for alluvial soils in lower Indo-Gangetic plain. At 5 cm depth, power and exponential regression models were best fitted for daily data in morning and afternoon, respectively, but it was reverse at 15 cm. However, at 30 cm, exponential models were best fitted for both the times. Regression analysis revealed that in morning for all three depths and in afternoon for 30 cm depth, soil temperatures (daily, weekly, and monthly) could be predicted more efficiently with the help of corresponding mean air temperature than that of maximum and minimum. However, in afternoon, prediction of soil temperature at 5 and 15 cm depths were more precised for all the time intervals when maximum air temperature was used, except for weekly soil temperature at 15 cm, where the use of mean air temperature gave better prediction.

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Direct evidence of the feedback between climate and weathering

Cited by 334 publications

References 39 publications

Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms

Li/Ca enrichments in great scallop shells (Pecten maximus) and their relationship with phytoplankton blooms

Anthropogenic perturbation of the carbon fluxes from land to ocean

Soil temperature prediction from air temperature for alluvial soils in lower Indo-Gangetic plain

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