Temporal variations in organic carbon species and fluxes from the Chena River, Alaska

Cai, Yihua; Guo, Laodong; Douglas, Thomas A.

doi:10.4319/lo.2008.53.4.1408

Cited by 60 publications

(55 citation statements)

References 35 publications

(57 reference statements)

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“…Recent studies in the Chena River watershed, a non-glaciated river draining the boundary between the Tanana Flats lowlands and nearby uplands, have shown a strong correlation between discharge and dissolved organic carbon (DOC) and total dissolved nitrogen (Cai et al, 2008a(Cai et al, , 2008bDouglas et al, 2013). Of particular note, nutrient exports are rapidly f lushed from surface soils during large discharge periods such as snow melt runoff or major summer precipitation events.…”

Section: Interior Alaska Wetlands and Hydrogeologymentioning

confidence: 99%

“…doi: 10.12952/journal.elementa.000032.f002 Permafrost acts as a confining bed in the subsurface that reduces soil water storage capacity and restricts groundwater f low 1998;Kane et al, 1991;Woo, 2000). The presence of permafrost can greatly affect the stream discharge response to storm activity (Carey and Quinton, 2005), the geochemistry of stream f low (Petrone et al, 2006;Bagard et al, 2011), and seasonal f luxes of nutrients like carbon and nitrogen out of northern watersheds (Carey, 2003;O'Donnell and Jones, 2006;Frey et al, 2007;Frey and McClelland, 2009;Walvoord and Striegl, 2007;Cai et al, 2008a;2008b;O'Donnell et al, 2012a;Douglas et al, 2013).…”

Section: Climatic and Physiographic Settingmentioning

confidence: 99%

“…Arctic and sub-arctic watersheds export much of their carbon as DOC f lushed out of surface vegetation and soils during spring melt (Macdonald and Yu, 2006;Raymond et al, 2007;Cai et al, 2008a). Roughly 60% of the annual DOC export from arctic and sub-arctic rivers occurs within the two months following snow melt and ice breakup Raymond et al, 2007), and this carbon is of modern age (Guo and Macdonald, 2006;Neff et al, 2006 water loads of other nutrients (like nitrogen) and trace metals (Rember and Trefry, 2004) as melt water interacts with surface soil and vegetation (McNamara et al 2008;Frey and McClelland, 2009).…”

Section: Observed Carbon F Luxes From Terrestrial Ecosystems As a Resmentioning

confidence: 99%

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Sources and sinks of carbon in boreal ecosystems of interior Alaska: A review

Douglas

Jones

Hiemstra

et al. 2014

Elementa: Science of the Anthropocene

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Boreal ecosystems store large quantities of carbon but are increasingly vulnerable to carbon loss due to disturbance and climate warming. The boreal region in Alaska and Canada, largely underlain by discontinuous permafrost, presents a challenging landscape for itemizing carbon sources and sinks in soil and vegetation. The roles of fire, forest succession, and the presence (or absence) of permafrost on carbon cycle, vegetation, and hydrologic processes have been the focus of multidisciplinary research in boreal ecosystems for the past 20 years. However, projections of a warming future climate, an increase in fire severity and extent, and the potential degradation of permafrost could lead to major landscape and carbon cycle changes over the next 20 to 50 years. To assist land managers in interior Alaska in adapting and managing for potential changes in the carbon cycle we developed this review paper by incorporating an overview of the climate, ecosystem processes, vegetation, and soil regimes. Our objective is to provide a synthesis of the most current carbon storage estimates and measurements to guide policy and land management decisions on how to best manage carbon sources and sinks. We surveyed estimates of aboveground and belowground carbon stocks for interior Alaska boreal ecosystems and summarized methane and carbon dioxide f luxes. These data have been converted into similar units to facilitate comparison across ecosystem compartments. We identify potential changes in the carbon cycle with climate change and human disturbance. A novel research question is how compounding disturbances affect carbon sources and sinks associated with boreal ecosystem processes. Finally, we provide recommendations to address the challenges facing land managers in efforts to manage carbon cycle processes. The results of this study can be used for carbon cycle management in other locations within the boreal biome which encompasses a broad distribution from 45° to 83° north.

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Section: Interior Alaska Wetlands and Hydrogeologymentioning

confidence: 99%

Section: Climatic and Physiographic Settingmentioning

confidence: 99%

Section: Observed Carbon F Luxes From Terrestrial Ecosystems As a Resmentioning

confidence: 99%

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Sources and sinks of carbon in boreal ecosystems of interior Alaska: A review

Douglas

Jones

Hiemstra

et al. 2014

Elementa: Science of the Anthropocene

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“…POC/SPM is an indicator of the particle organic carbon fraction of the SPM [64,74]. The POC/SPM in Taihu Lake ranges from 0.02 to 0.72, with a mean value of 0.11 ± 0.13.…”

Section: Probable Source Of Pocmentioning

confidence: 99%

Spatiotemporal Variation in Particulate Organic Carbon Based on Long-Term MODIS Observations in Taihu Lake, China

et al. 2017

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Abstract:In situ measured values of particulate organic carbon (POC) in Taihu Lake and remote sensing reflectance observed by three satellite courses from 2014 to 2015 were used to develop an near infrared-red (NIR-Red) empirical algorithm of POC for the Moderate Resolution Imaging Spectroradiometer (MODIS-Aqua) satellite image. The performance of the POC algorithm is highly consistent with the in situ measured POC, with root mean square error percentage (RMSPs) of 38.9% and 31.5% for two independent validations, respectively. The MODIS-derived POC also shows an acceptable result, with RMSPs of 53.6% and 61.0% for two periods of match-up data. POC from 2005 to 2007 is much higher than it is from 2002 to 2004 and 2008 to 2013, due to a large area of algal bloom. Riverine flux is an important source of POC in Taihu Lake, especially in the lake's bank and bays. The influence of a terrigenous source of POC can reach the center lake during periods of heavy precipitation. Sediment resuspension is also a source of POC in the lake due to the area's high dynamic ratio (25.4) and wind speed. The source of POC in an inland shallow lake is particularly complex, and additional research on POC is needed to more clearly reveal its variation in inland water.

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“…Draining a total land area of approximately 3.2 million km 2 , the Mississippi River (MR) is one of the largest rivers in the world and plays an important role in global river carbon export [3][4][5][6]. The river has two main outlets to the Gulf of Mexico: the Mississippi River main stem (also known as the Lowermost Mississippi River), and the Atchafalaya River (AR) which also carries the total flow of the Red River (RR).…”

Section: Introductionmentioning

confidence: 99%

Unravelling the Relative Contribution of Dissolved Carbon by the Red River to the Atchafalaya River

DelDuco

2017

Water

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Abstract:The Atchafalaya River (AR), North America's largest swamp river, annually discharges a large volume of freshwater (nearly 200 km 3 ), delivering~25% of the Mississippi River's (MR) flow and the entire Red River's (RR) flow into the Gulf of Mexico. Studies have reported higher levels of organic carbon in the AR's outlets compared to the MR's outlet, raising questions about local carbon sources. In this study, we investigated dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) inputs into the AR from the RR and MR using DOC and DIC concentrations, mass loading, and isotopic signature (δ 13 C) analyses. Monthly river water sampling was conducted in the MR and RR near their confluence where the AR is formed from May 2015 to May 2016. DIC concentrations in the RR were found to be only half of those found in the MR, while the RR's DOC concentrations were on average 1.8 times higher than those found in the MR. Based on the models developed for this study period, the RR's contribution to DIC mass loading in the AR represented 1.41 teragrams (Tg) (or, 29.7%) of the total 4.76 Tg DIC transported by both tributaries, while its contribution to DOC mass loading was disproportionately high, accounting for 1.74 Tg of the 2.75 Tg DOC (or, 63.2% of total DOC) entering the AR. Both δ 13 C DIC and δ 13 C DOC showed significantly more negative values in the RR than those found in the MR. Significant correlation between δ 13 C DIC and δ 13 C DOC isotope values in the RR indicated interrelation of dissolved carbon processing, which was not observable in the MR. These results strongly suggest that the RR is an extremely significant source of DOC to the AR, and thus the Gulf of Mexico, and additionally plays an important role in diluting the anthropogenically enhanced DIC fluxes of the MR.

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Temporal variations in organic carbon species and fluxes from the Chena River, Alaska

Cited by 60 publications

References 35 publications

Sources and sinks of carbon in boreal ecosystems of interior Alaska: A review

Sources and sinks of carbon in boreal ecosystems of interior Alaska: A review

Spatiotemporal Variation in Particulate Organic Carbon Based on Long-Term MODIS Observations in Taihu Lake, China

Unravelling the Relative Contribution of Dissolved Carbon by the Red River to the Atchafalaya River

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