Riverine coupling of biogeochemical cycles between land, oceans, and atmosphere

Aufdenkampe, Anthony K.; Mayorga, Emilio; Raymond, Peter A.; Mélack, John M.; Doney, Scott C.; Alin, Simone R.; Aalto, R. E.; Yoo, Kyungsoo

doi:10.1890/100014

Cited by 994 publications

(898 citation statements)

References 54 publications

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“…The mean atmospheric flux of CO 2 from the stream network of 2031 ± 1527 g C m −2 yr −1 is in close agreement with bulk estimates for streams and rivers in the temperate zone of 2630 g C m −2 yr −1 (Aufdenkampe et al, 2011) and 2370 g C m −2 yr −1 (Butman and Raymond, 2011). The fractional surface coverage of streams and rivers (0.42 % for stream order 4) corresponds to the global average of 0.47 % and also mean terrestrial NPP in the catchments (515 g C m −2 yr −1 ) was in close correspondence to recent global mean estimates (495 g C m −2 yr −1 ; Zhao et al, 2005).…”

Section: An Average Study Regionsupporting

confidence: 76%

“…Inland waters represent an important component of the global carbon cycle by transporting, storing and processing significant amounts of organic and inorganic carbon (C) and by emitting substantial amounts of carbon dioxide (CO 2 ) to the atmosphere (Cole et al, 2007;Aufdenkampe et al, 2011). Globally about 0.32 to 0.8 Pg C is emitted per year as CO 2 from lakes and reservoirs Barros et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Regional-scale lateral carbon transport and CO<sub>2</sub> evasion in temperate stream catchments

et al. 2017

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Abstract. Inland waters play an important role in regional to global-scale carbon cycling by transporting, processing and emitting substantial amounts of carbon, which originate mainly from their catchments. In this study, we analyzed the relationship between terrestrial net primary production (NPP) and the rate at which carbon is exported from the catchments in a temperate stream network. The analysis included more than 200 catchment areas in southwest Germany, ranging in size from 0.8 to 889 km 2 for which CO 2 evasion from stream surfaces and downstream transport with stream discharge were estimated from water quality monitoring data, while NPP in the catchments was obtained from a global data set based on remote sensing. We found that on average 13.9 g C m −2 yr −1 (corresponding to 2.7 % of terrestrial NPP) are exported from the catchments by streams and rivers, in which both CO 2 evasion and downstream transport contributed about equally to this flux. The average carbon fluxes in the catchments of the study area resembled global and large-scale zonal mean values in many respects, including NPP, stream evasion and the carbon export per catchment area in the fluvial network. A review of existing studies on aquatic-terrestrial coupling in the carbon cycle suggests that the carbon export per catchment area varies in a relatively narrow range, despite a broad range of different spatial scales and hydrological characteristics of the study regions.

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Section: An Average Study Regionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Regional-scale lateral carbon transport and CO<sub>2</sub> evasion in temperate stream catchments

et al. 2017

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“…Coastal ecosystems are complex as coastal biogeochemical dynamics are governed by interactions between processes on land, in the open ocean and the atmosphere (Aufdenkampe et al 2011), many of them affected by anthropogenic processes. Unlike pelagic ecosystems, coastal ecosystems are often dominated by benthic ecosystems, including engineering species (e.g.…”

Section: Introductionmentioning

confidence: 99%

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Duarte

Hendriks

Moore

et al. 2013

Estuaries and Coasts

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Ocean acidification due to anthropogenic CO 2 emissions is a dominant driver of long-term changes in pH in the open ocean, raising concern for the future of calcifying organisms, many of which are present in coastal habitats. However, changes in pH in coastal ecosystems result from a multitude of drivers, including impacts from watershed processes, nutrient inputs, and changes in ecosystem structure and metabolism. Interaction between ocean acidification due to anthropogenic CO 2 emissions and the dynamic regional to local drivers of coastal ecosystems have resulted in complex regulation of pH in coastal waters. Changes in the watershed can, for example, lead to changes in alkalinity and CO 2 fluxes that, together with metabolic processes and oceanic dynamics, yield high-magnitude decadal changes of up to 0.5 units in coastal pH. Metabolism results in strong diel to seasonal fluctuations in pH, with characteristic ranges of 0.3 pH units, with metabolically intense habitats exceeding this range on a daily basis. The intense variability and multiple, complex controls on pH implies that the concept of ocean acidification due to anthropogenic CO 2 emissions cannot be transposed to coastal ecosystems directly. Furthermore, in coastal ecosystems, the detection of trends towards acidification is not trivial and the attribution of these changes to anthropogenic CO 2 emissions is even more problematic. Coastal ecosystems may show acidification or basification, depending on the balance between the invasion of coastal waters by anthropogenic CO 2 , watershed export of alkalinity, organic matter and CO 2 , and changes in the balance between primary production, respiration and calcification rates in response to changes in nutrient inputs and losses of ecosystem components. Hence, we contend that ocean acidification from anthropogenic CO 2 is largely an open-ocean syndrome and that a concept of anthropogenic impacts on marine pH, which is applicable across the entire ocean, from coastal to open-ocean environments, provides a superior framework to consider the multiple components of the anthropogenic perturbation of marine pH trajectories. The concept of anthropogenic impacts on seawater pH acknowledges that a regional focus is necessary to predict future trajectories in the pH of coastal waters and points at opportunities to manage these trajectories locally to conserve coastal organisms vulnerable to ocean acidification.

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“…T he amount of carbon that rivers deliver to oceans represents only about a third of the terrestrial carbon entering rivers 1 . The flux of organic carbon mobilized into rivers, however, is much greater than the river network's capacity to stabilize the carbon via organo-mineral complexation or anoxic burial.…”

mentioning

confidence: 99%

“…Nearly half the organic carbon introduced into streams is rapidly metabolized or photolysed and returned to the atmosphere as CO 2 (ref. 1), Consequently, rates of erosion, delivery and mixing of fresh mineral surfaces with organic matter likely control watershed-to global-scale carbon sequestration fluxes 1 . Recent work emphasizes the importance of headwater rivers in this context.…”

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confidence: 99%

Mechanisms of carbon storage in mountainous headwater rivers

et al. 2012

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Published research emphasizes rapid downstream export of terrestrial carbon from mountainous headwater rivers, but little work focuses on mechanisms that create carbon storage along these rivers, or on the volume of carbon storage. Here we estimate organic carbon stored in diverse valley types of headwater rivers in Rocky Mountain National Park, CO, USA. We show that low-gradient, broad valley bottoms with old-growth forest or active beaver colonies store the great majority of above-and below-ground carbon. These laterally unconfined valley segments constitute o25% of total river length, but store B75% of the carbon. Floodplain sediment and coarse wood dominate carbon storage. Our estimates of riverine carbon storage represent a previously undocumented but important carbon sink. Our results indicate that: not all mountainous rivers rapidly export carbon; not all valley segments are equally important in carbon storage; and historical changes in riverine complexity have likely reduced carbon storage.

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Riverine coupling of biogeochemical cycles between land, oceans, and atmosphere

Cited by 994 publications

References 54 publications

Regional-scale lateral carbon transport and CO<sub>2</sub> evasion in temperate stream catchments

Regional-scale lateral carbon transport and CO<sub>2</sub> evasion in temperate stream catchments

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Mechanisms of carbon storage in mountainous headwater rivers

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Riverine coupling of biogeochemical cycles between land, oceans, and atmosphere

Cited by 994 publications

References 54 publications

Regional-scale lateral carbon transport and CO&lt;sub&gt;2&lt;/sub&gt; evasion in temperate stream catchments

Regional-scale lateral carbon transport and CO&lt;sub&gt;2&lt;/sub&gt; evasion in temperate stream catchments

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Mechanisms of carbon storage in mountainous headwater rivers

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Regional-scale lateral carbon transport and CO<sub>2</sub> evasion in temperate stream catchments

Regional-scale lateral carbon transport and CO<sub>2</sub> evasion in temperate stream catchments