Aquatic Geochemistry最新文献

{"title":"Aggregation and Dispersion Behaviours of Riverine Trace Metals (Fe, Al, V, Mn, Ni, and Zn) and Organic Matter in Freshwater and Estuarine Conditions: A case study in Shira and Midori Rivers, Kumamoto, Japan","authors":"Hiroaki Ito,&nbsp;Shinya Tsurumaki,&nbsp;Takehide Hama,&nbsp;Kei Ishida,&nbsp;Tsugihiro Watanabe,&nbsp;Luong van Duc,&nbsp;Yasunori Kawagoshi","doi":"10.1007/s10498-022-09408-7","DOIUrl":"10.1007/s10498-022-09408-7","url":null,"abstract":"<div><p>The aggregation and dispersion of metals and organic matter are an important morphological alteration process for their transportation and bioavailability in coastal areas. However, variable mixing behaviours can be observed for some substances (e.g. Mn and Cu) due to the variable interaction systems in natural systems. In this study, riverine freshwater in the Shira and Midori rivers, Kumamoto, Japan, was mixed with artificial seawater to investigate the aggregation and dispersion behaviours of trace metals (i.e. Fe, Al, Mn, Zn, Cu, V, and Ni) and organic matter. In particular, their interactions were examined with differentiating the fast and slow transformations and considering the effects of suspended substances. Comparisons of sequential processes, including seawater mixing, decantation, centrifugation, and multiple filtrations, illustrated the aggregation and dispersion characteristics of the metals and organic matter as follows. A strong aggregating nature was evident for Fe in estuarine systems. In addition, the slow aggregation of Fe was accelerated by river-borne suspended substances. Small Fe (oxy)hydroxide particles were the major forms of dissolved Fe in both freshwater and estuarine systems and were partly associated with the other metals. In contrast, Zn and Ni were characterised by strong dispersion properties, although it can resorb onto suspended substances in estuarine systems. Synchronous behaviours with Zn and Ni were observed for V, Cu, and organic matter in the Midori River. The adsorption of Mn onto suspended substances was evident in the freshwater systems instead of the estuarine systems. Meanwhile, the behaviour of Mn is known to be dependent on its abundance in suspended forms, its redox state, and the influence of Fe. V and Cu, which are non-conservative in nature, were affected by other metals such as Fe, Zn, and Ni. Al, whose behaviour is largely dependent on the target estuary, which was also affected by other metals. Slow aggregation of organic matter was induced by suspended substances which were produced by fast transformation. In addition, evident interactions between suspended and dissolved substances were observed with the behaviours of Fe, Zn, Ni, and organic matter, indicating that the deposition and dispersion at the early stage of estuarine mixing can influence the subsequent slow transformation in real environments.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"29 1","pages":"1 - 23"},"PeriodicalIF":1.6,"publicationDate":"2022-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10498-022-09408-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5057646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial Acid Sulfate Weathering of Basaltic Rocks: Implication for Enzymatic Reactions","authors":"Fatih Sekerci,&nbsp;Nurgul Balci","doi":"10.1007/s10498-022-09407-8","DOIUrl":"10.1007/s10498-022-09407-8","url":null,"abstract":"<div><p>Two basaltic rocks were reacted in acid sulfate and non-acid sulfate solutions with an initial pH value of 2 in the presence and absence of <i>A. ferrooxidans</i> to determine if basalt dissolution can support the metabolically active growth of <i>A. ferrooxidans</i>. Similar elemental release rates (<i>R</i>_Si, <i>R</i>_Ca, <i>R</i>_Mg) calculated for both biotic and abiotic experiments suggest rather a negligible microbial impact on the dissolution of basaltic rocks within the acid sulfate solution. Nevertheless, in contrast with the abiotic experiments, measurements of remarkably high concentration of Fe(III)_aq in microbial experiments confirmed the bacterial metabolism. Moreover, detected cell division and increasing total cell numbers with the extent of the experiments provide further evidence for the growth of metabolically active <i>A. ferrooxidans</i> during the dissolution of the rocks. Formation of jarosite ((K, Na, H₃O)Fe₃(SO₄)₂(OH)₆) only in the biotic experiments is attributed to the microbially catalyzed Fe(II)_aq oxidation. Overall, our results showed that acidic solutions that reacted with basaltic rocks can sustain the growth of Fe(II)_aq oxidizing bacteria. Furthermore, identification of jarosite only in the biotic experiments emphasizes the enzymatic Fe(II) oxidation as the key step for its formation during basalt weathering at acid conditions, highlighting its biosignature potential on Earth and Earth-like planets (e.g., Mars).</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 3-4","pages":"155 - 184"},"PeriodicalIF":1.6,"publicationDate":"2022-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5640438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal Variations of Riverine CO2 Partial Pressure and its Effect on CO2 Flux at the Water–Air Interface in a Small Karst River","authors":"Shengjun Ding,&nbsp;Zhongfa Zhou,&nbsp;Hui Dong,&nbsp;Lihui Yan,&nbsp;Liangxing Shi,&nbsp;Jing Huang,&nbsp;Heng Zhang","doi":"10.1007/s10498-022-09406-9","DOIUrl":"10.1007/s10498-022-09406-9","url":null,"abstract":"<div><p>In the global carbon cycle, rivers are the main transport channel for terrestrial carbon sources into the ocean, and their CO₂ fluxes at the water–air interface affect the carbon budget. As an important component of the carbon cycle in the terrestrial ecosystem, karst regions exhibit carbon source and sink effects due to their special environmental conditions. To elaborate the spatial and temporal distribution of CO₂ fluxes at the water–air interface of karst rivers and the influencing factors, systematic monitoring of small karst rivers in southwest China was conducted between November and December 2019 and between June and July 2020, respectively. The results show that: (1) the water chemistry of Chiwuxi River belonged to the HCO₃–Ca–Mg type, and Ca²⁺ and HCO₃⁻ temporally showed a larger concentration in the dry season than in the wet season. (2) CO₂ partial pressure (<i>p</i>CO₂) and CO₂ fluxes showed a seasonal characteristic of higher values in the wet season than in the dry season. <i>p</i>CO₂ ranged from 323.59 to 1380.38 μatm and CO₂ fluxes ranged from −24.31 to 353.74 mmol (m² d)⁻¹. During the wet season, the Chiwuxi River showed a carbon source effect. During the dry season, the photosynthesis of aquatic plants reduced CO₂ outgassing. (3) Isotopic compositions of dissolved inorganic carbon (δ¹³C_DIC) showed a higher value in the dry season than in the wet season. The dissolved inorganic carbon mainly originated from soil CO₂ and carbonate weathering. To improve the understanding of riverine carbon cycling, it is necessary to study CO₂ fluxes at the water–air interface of small rivers in the karst region. Thus, this will help to reduce the uncertainty of CO₂ fluxes in global rivers.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 3-4","pages":"135 - 154"},"PeriodicalIF":1.6,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10498-022-09406-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4559863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Diverse Urban Pressures on Water Characteristics in a Small Eastern Mediterranean Watershed","authors":"E. Maatouk,&nbsp;A. El Samrani,&nbsp;R. Sawan,&nbsp;R. Bou Ghosn Salameh,&nbsp;V. Kazpard,&nbsp;Z. Matar","doi":"10.1007/s10498-022-09405-w","DOIUrl":"10.1007/s10498-022-09405-w","url":null,"abstract":"<div><p>This work focuses on the characterization of a typical coastal karst watershed by addressing its physico-chemical parameters. The concentrations of the main ions clearly indicate the dominance of Ca²⁺ and HCO₃⁻ with a carbonate weathering rate equivalent to 230t/Km²/year; that is a typical weathering of karst watersheds. The spatio-temporal variability of dissolved organic matter (DOM) is also assessed in the watershed. Many samples were collected under different hydrological conditions from three representative sites. The evolution of OM composition along an urbanization gradient from upstream to downstream Kadisha watershed reveals the very strong impact of urban discharges on the receiving waters. Substantial differences in DOC results are highlighted in relation to the urban or natural origin of the DOM. Upstream OM flux is quantified and compared to downstream OM flux showing that, during the low flow period, the downstream flux is 29 times higher than the upstream. Also, a large fraction of non-humic substances, including hydrophilic organic matter HPI, is detected in the downstream section impacted by urban discharges. The higher values of SUVA noticed for DOM at upstream compared to downstream, reflects the low aromaticity and non-humic character of DOM in downstream. These outcomes show the impact of the Tripoli urban discharges on the quality and quantity of OM in the receiving waters downstream of the Kadisha catchment. This is typical at low water period when the dilution factor of urban discharges in the receiving waters is the least.\u0000</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 2","pages":"111 - 133"},"PeriodicalIF":1.6,"publicationDate":"2022-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4979188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluid–Rock Interactions in Geothermal Reservoirs, Germany: Thermal Autoclave Experiments Using Sandstones and Natural Hydrothermal Brines","authors":"Rafael Schäffer,&nbsp;Emilia Götz,&nbsp;Nils Schlatter,&nbsp;Gabriela Schubert,&nbsp;Sebastian Weinert,&nbsp;Stefanie Schmidt,&nbsp;Ute Kolb,&nbsp;Ingo Sass","doi":"10.1007/s10498-022-09404-x","DOIUrl":"10.1007/s10498-022-09404-x","url":null,"abstract":"<div><p>As renewable energy, geothermal can contribute substantially to the energy transition. To generate electricity or to harvest heat, high-saline fluids are tapped by wells of a few kilometres and extracted from hydrothermal reservoirs. After the heat exchanger units have been passed by, these fluids are reinjected into the reservoir. Due to the pressure and temperature differences between the subsurface and the surface, as well as the cooling of the fluids in the power plant, unwanted chemical reactions can occur within the reservoir, in the borehole, and within the power plant itself. This can reduce the permeability of the reservoir as well as the output of the geothermal power plant. This study aims to simulate real subsurface reactions using batch and leaching experiments with sandstone or sandstone powder as solid phase, and deionised water or natural brine as liquid phase. It is demonstrated that fluid composition changes after only a few days. In particular, calcite, aragonite, clay minerals, and zinc phases precipitate from the natural brine. In contrast, in particular minerals containing potassium, arsenic, barium, and silica are dissolved. Due to the experimental set-up, these mineral reactions mainly took place on the surface of the samples, which is why no substantial changes in petrophysical properties could be observed. However, it is assumed that the observed reactions on the reservoir scale have a relevant influence on parameters such as permeability.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 2","pages":"63 - 110"},"PeriodicalIF":1.6,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10498-022-09404-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5182238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical Proxies and Mineralogical Fingerprints of Sedimentary Processes in a Closed Shallow Lake Basin Since 1850","authors":"Paola Gravina,&nbsp;Alessandro Ludovisi,&nbsp;Beatrice Moroni,&nbsp;Riccardo Vivani,&nbsp;Roberta Selvaggi,&nbsp;Chiara Petroselli,&nbsp;David Cappelletti","doi":"10.1007/s10498-022-09403-y","DOIUrl":"10.1007/s10498-022-09403-y","url":null,"abstract":"<div><p>Lake systems are essential for the environment, the biosphere, and humans but are highly impacted by anthropogenic activities accentuated by climate change. Understanding how lake ecosystems change due to human impacts and natural forces is crucial to managing their current state and possible future restoration. The high sensitivity of shallow closed lakes to natural and anthropogenic forcing makes these lacustrine ecosystems highly prone to variations in precipitation and sedimentation processes. These variation processes, occurring in the water column, produce geochemical markers or proxies recorded in lake sedimentary archives. This study investigated specific proxies on high-resolution sedimentary archives (2–3 years resolution) of the Trasimeno lake (Central Italy). The Trasimeno lake underwent three different hydrological phases during the twentieth century due to several fluctuations induced mainly by human activities and climate change. The Trasimeno lake, a large and shallow basin located in the Mediterranean area, is a good case study to assess the effects of intense anthropogenic activity related to agriculture, tourism, industry, and climate changes during the Anthropocene. The aim is to identify the main characteristics of the main sedimentary events in the lake during the last 150 years, determining the concentrations of major and trace elements, the amount of organic matter, and the mineralogical composition of the sediments. This type of work demonstrates that studying sediment archives at high resolution is a viable method for reconstructing the lake’s history through the evolution/trends of the geochemical proxies stored in the sediment records. This effort makes it possible to assess past anthropogenic impact and, under the objectives of the European Green Deal (zero-pollution ambition for a toxic-free environment), to monitor, prevent, and remedy pollution related to soil and water compartments.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 1","pages":"43 - 62"},"PeriodicalIF":1.6,"publicationDate":"2022-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10498-022-09403-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4825957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Late Holocene Record of Variations in the Chemical Weathering Intensity and Pedogenesis in a Lake Catchment from Southern India","authors":"Kizhur Sandeep,&nbsp;Rajasekhariah Shankar,&nbsp;Anish Kumar Warrier","doi":"10.1007/s10498-021-09402-5","DOIUrl":"10.1007/s10498-021-09402-5","url":null,"abstract":"<div><p>We investigated the detrital influx, chemical weathering intensity, provenance and pedogenesis over the past 2,500 years in the catchment of Pookot Lake, southern India. The down-core variations of metal/Al ratios (Na/Al, K/Al, Mg/Al, Ca/Al, Fe/Al, Mn/Al, Zn/Al, Ba/Al) of the Pookot sediments indicate changes in the rainfall-induced terrigenous inflow to the lake. In contrast, fluctuations in the chemical index of alteration (CIA) and Rb/Sr values denote the variability in the strength of chemical weathering in the watershed of the lake. The results show that the detrital influx, and hence rainfall, remained steady except during 1500–600 cal. years B.P. (high) and 600–300 cal. year B.P. (low) in the Pookot lake catchment. However, the periods of high/low chemical weathering intensity in the catchment do not correspond to periods of high/low detrital influx to the lake basin. The similar shale-normalized rare earth elemental curves point to a uniform provenance. The past pedogenic activity is indicated by pedogenic χ_lf and pedogenic χ_fd derived from citrate-bicarbonate-dithionite (CBD) extraction. The data indicate that the fine-grained magnetite/maghemite formed during the pedogenesis mainly contributes to the magnetic signal of sediments. The degree of pedogenesis was strong during 2500–2000 cal. years B.P. and moderate throughout 1500–600 cal. years B.P. The pedogenic intensity became stronger again during ~ 600 cal. years B.P., which weakened between 600 and 300 cal. years B.P. and remained steady thereafter. The present study indicates that detrital influx proxies like metal/Al ratios are more suitable for reconstructing past climate in tropical climate rather than chemical weathering indices.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 1","pages":"27 - 42"},"PeriodicalIF":1.6,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4459563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxygen Consumption of Resuspended Sediments of the Upper Elbe Estuary: Process Identification and Prognosis","authors":"M. Spieckermann,&nbsp;A. Gröngröft,&nbsp;M. Karrasch,&nbsp;A. Neumann,&nbsp;A. Eschenbach","doi":"10.1007/s10498-021-09401-6","DOIUrl":"10.1007/s10498-021-09401-6","url":null,"abstract":"<div><p>The resuspension of sediment leads to an increased release of nutrients and organic substances into the overlying water column, which can have a negative effect on the oxygen budget. Especially in the warmer months with a lower oxygen saturation and higher biological activity, the oxygen content can reach critical thresholds in estuaries like the upper Elbe estuary. Many studies have dealt with the nutrient fluxes that occur during a resuspension event. However, the sediment properties that influence the oxygen consumption potential (OCP) and the different biochemical processes have not been examined in detail. To fill this gap, we investigated the biogeochemical composition, texture, and OCP of sediments at 21 locations as well as the temporal variability within one location for a period of 2 years (monthly sampling) in the upper Elbe estuary. The OCP of sediments during a seven-day resuspension event can be described by the processes of sulphate formation, nitrification, and mineralisation. Chlorophyll, total nitrogen (<i>N</i>_total), and total organic carbon showed the highest correlations with the OCP. Based on these correlations, we developed a prognosis model to calculate the OCP for the upper Elbe estuary with a single sediment parameter (<i>N</i>_total). The model is well suited to calculate the oxygen consumption of resuspended sediments in the Hamburg port area during the relevant warmer months and shows a normalised root mean squared error of &lt; 0.11 ± 0.13. Thus, the effect of maintenance measures such as water injection dredging and ship-induced wave on the oxygen budget of the water can be calculated.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"28 1","pages":"1 - 25"},"PeriodicalIF":1.6,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10498-021-09401-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5164107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temporal and Spatial Variabilities of Chemical and Physical Parameters on the Heron Island Coral Reef Platform","authors":"Samuel A. H. Kekuewa,&nbsp;Travis A. Courtney,&nbsp;Tyler Cyronak,&nbsp;Theodor Kindeberg,&nbsp;Bradley D. Eyre,&nbsp;Laura Stoltenberg,&nbsp;Andreas J. Andersson","doi":"10.1007/s10498-021-09400-7","DOIUrl":"10.1007/s10498-021-09400-7","url":null,"abstract":"<div><p>Globally, coral reefs are threatened by ocean warming and acidification. The degree to which acidification will impact reefs is dependent on the local hydrodynamics, benthic community composition, and biogeochemical processes, all of which vary on different temporal and spatial scales. Characterizing the natural spatiotemporal variability of seawater carbonate chemistry across different reefs is critical for elucidating future impacts on coral reefs. To date, most studies have focused on select habitats, whereas fewer studies have focused on reef scale variability. Here, we investigate the temporal and spatial seawater physicochemical variability across the entire Heron Island coral reef platform, Great Barrier Reef, Australia, for a limited duration of six days. Autonomous sensor measurements at three sites across the platform were complemented by reef-wide boat surveys and discrete sampling of seawater carbonate chemistry during the morning and evening. Variability in both temporal and spatial physicochemical properties were predominantly driven by solar irradiance (and its effect on biological activity) and the semidiurnal tidal cycles but were influenced by the local geomorphology resulting in isolation of the platform during low tide and rapid flooding during rising tides. As a result, seawater from previous tidal cycles was sometimes trapped in different parts of the reef leading to unexpected biogeochemical trends in space and time. This study illustrates the differences and limitations of data obtained from high-frequency measurements in a few locations compared to low-frequency measurements at high spatial resolution and coverage, showing the need for a combined approach to develop predictive capability of seawater physicochemical properties on coral reefs.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"27 4","pages":"241 - 268"},"PeriodicalIF":1.6,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10498-021-09400-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4184400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Organic versus Inorganic Carbon Exports from Glacier and Permafrost Watersheds in Qinghai–Tibet Plateau","authors":"Congrong Yu,&nbsp;Ying Li,&nbsp;Huijun Jin,&nbsp;Qiang Ma,&nbsp;Zhongbo Yu,&nbsp;Keliang Shi,&nbsp;Xiangying Li,&nbsp;Gang Chen","doi":"10.1007/s10498-021-09399-x","DOIUrl":"10.1007/s10498-021-09399-x","url":null,"abstract":"<div><p>In a warming climate, land-to-water carbon mobilization is increasing in glacier and permafrost area. To identify the connection between exported river carbon content and the permafrost or glacier condition in the high-altitude mountain area, we studied the dissolved organic carbon and dissolved inorganic carbon concentration in three streams of Qinghai–Tibet Plateau (QTP), which were located in the continuous permafrost, seasonal permafrost and glacial basin, respectively. It was found that the DIC and DOC concentrations were lower in the glacial rivers compared with the permafrost derived rivers; but more DOC would be exported from glacier due to the large amount of melted glacier water in the high mountainous area. DIC/DOC ratio in rivers reflected the watershed landscape types. In the permafrost area, the river recharged by seasonal permafrost had higher DIC concentration than the river in the continuous permafrost region, suggesting that increased DIC concentration could be a precursor of permafrost degradation. Research is meaningful to estimate the DOC and DIC export from high mountain area.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"27 4","pages":"283 - 296"},"PeriodicalIF":1.6,"publicationDate":"2021-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4735182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}