Global Biogeochemical Cycles最新文献_第8页

Physical Mechanisms Sustaining Silica Production Following the Demise of the Diatom Phase of the North Atlantic Spring Phytoplankton Bloom During EXPORTS 出口期间北大西洋春季浮游植物绽放硅藻阶段消亡后维持二氧化硅生产的物理机制

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-07-16 DOI: 10.1029/2023GB008048

Mark A. Brzezinski, Leah Johnson, Margaret Estapa, Samantha Clevenger, Montserrat Roca-Martí, Elisa Romanelli, Kristen N. Buck, Bethany D. Jenkins, Janice L. Jones

{"title":"Physical Mechanisms Sustaining Silica Production Following the Demise of the Diatom Phase of the North Atlantic Spring Phytoplankton Bloom During EXPORTS","authors":"Mark A. Brzezinski, Leah Johnson, Margaret Estapa, Samantha Clevenger, Montserrat Roca-Martí, Elisa Romanelli, Kristen N. Buck, Bethany D. Jenkins, Janice L. Jones","doi":"10.1029/2023GB008048","DOIUrl":"https://doi.org/10.1029/2023GB008048","url":null,"abstract":"Each spring, the North Atlantic experiences one of the largest open-ocean phytoplankton blooms in the global ocean. Diatoms often dominate the initial phase of the bloom with succession driven by exhaustion of silicic acid. The North Atlantic was sampled over 3.5 weeks in spring 2021 following the demise of the main diatom bloom, allowing mechanisms that sustain continued diatom contributions to be examined. Diatom biomass was initially relatively high with biogenic silica concentrations up to 2.25 μmol Si L−1. A low initial silicic acid concentration of 0.1–0.3 μM imposed severe Si limitation of silica production and likely limited the diatom growth rate. Four storms over the next 3.5 weeks entrained silicic acid into the mixed layer, relieving growth limitation, but uptake limitation persisted. Silica production was modest and dominated by the >5.0 μm size fraction although specific rates were highest in the 0.6–5.0 μm size fraction over most of the cruise. Silica dissolution averaged 68% of silica production. The resupply of silicic acid via storm entrainment and silica dissolution supported a cumulative post-bloom silica production that was 32% of that estimated during the main bloom event. Diatoms contributed significantly to new and to primary production after the initial bloom, possibly dominating both. Diatom contribution to organic-carbon export was also significant at 40%–70%. Thus, diatoms can significantly contribute to regional biogeochemistry following initial silicic acid depletion, but that contribution relies on physical processes that resupply the nutrient to surface waters.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 7","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023GB008048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141631230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Size-Fractionated Primary Production Dynamics During the Decline Phase of the North Atlantic Spring Bloom 北大西洋春季藻类繁殖衰退阶段的粒径分化初级生产动态

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-07-06 DOI: 10.1029/2023GB008019

Meredith G. Meyer, Mark A. Brzezinski, Melanie R. Cohn, Sasha J. Kramer, Nicola Paul, Garrett Sharpe, Alexandria K. Niebergall, Scott Gifford, Nicolas Cassar, Adrian Marchetti

{"title":"Size-Fractionated Primary Production Dynamics During the Decline Phase of the North Atlantic Spring Bloom","authors":"Meredith G. Meyer, Mark A. Brzezinski, Melanie R. Cohn, Sasha J. Kramer, Nicola Paul, Garrett Sharpe, Alexandria K. Niebergall, Scott Gifford, Nicolas Cassar, Adrian Marchetti","doi":"10.1029/2023GB008019","DOIUrl":"https://doi.org/10.1029/2023GB008019","url":null,"abstract":"The North Atlantic is a region of enhanced biogeochemical and climatological importance for the global ocean as it is the site of one of the largest seasonal phytoplankton blooms on the planet. However, there is a lack of understanding of how phytoplankton size influences bloom dynamics and associated nutrient utilization rates, particularly during the decline phase when export to the deep ocean is especially pronounced. Here, we evaluate trends in size-fractionated carbon, nitrogen, and silicic acid uptake rates in conjunction with environmental parameters to assess these dynamics. In our study, the decline phase of the bloom continued to be highly productive with net primary production (NPP) ranging from 36.4 to 146.6 mmol C m−2 d−1 and approximately 54% of primary production being driven by large phytoplankton cells (≥5 μm) that were primarily utilizing nitrate (mean f-ratio of 0.77). Entrainment of silicic acid related to deepening of the mixed layer caused by storms increased silicic acid uptake rates to 2.0–5.7 mmol Si m−2 d−1 without concomitant increases in NPP by large cells (silicic acid to carbon uptake ratios averaged 0.12). A companion study in the North Pacific allowed for paired evaluation of these regions. Our results suggest that in highly productive regions where phytoplankton biomass and productivity is distributed across a broad range of cell sizes, such as the North Atlantic, size itself has a stronger influence on nutrient cycling and potential carbon export relative to regions with lower production and a predominance of small (<5 μm) cells, such as the North Pacific.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 7","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141556574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observational and Numerical Modeling Constraints on the Global Ocean Biological Carbon Pump 全球海洋生物碳泵的观测和数值模拟制约因素

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-07-04 DOI: 10.1029/2024GB008156

Scott C. Doney, Kayla A. Mitchell, Stephanie A. Henson, Emma Cavan, Tim DeVries, Nicolas Gruber, Judith Hauck, Colleen B. Mouw, Jens D. Müller, Francois W. Primeau

{"title":"Observational and Numerical Modeling Constraints on the Global Ocean Biological Carbon Pump","authors":"Scott C. Doney, Kayla A. Mitchell, Stephanie A. Henson, Emma Cavan, Tim DeVries, Nicolas Gruber, Judith Hauck, Colleen B. Mouw, Jens D. Müller, Francois W. Primeau","doi":"10.1029/2024GB008156","DOIUrl":"https://doi.org/10.1029/2024GB008156","url":null,"abstract":"This study characterized ocean biological carbon pump metrics in the second iteration of the REgional Carbon Cycle Assessment and Processes (RECCAP2) project. The analysis here focused on comparisons of global and biome-scale regional patterns in particulate organic carbon (POC) production and sinking flux from the RECCAP2 ocean biogeochemical model ensemble against observational products derived from satellite remote sensing, sediment traps, and geochemical methods. There was generally good model-data agreement in mean large-scale spatial patterns, but with substantial spread across the model ensemble and observational products. The global-integrated, model ensemble-mean export production, taken as the sinking POC flux at 100 m (6.08 ± 1.17 Pg C yr−1), and export ratio defined as sinking flux divided by net primary production (0.154 ± 0.026) both fell at the lower end of observational estimates. Comparison with observational constraints also suggested that the model ensemble may have underestimated regional biological CO2 drawdown and air-sea CO2 flux in high productivity regions. Reasonable model-data agreement was found for global-integrated, ensemble-mean sinking POC flux into the deep ocean at 1,000 m (0.65 ± 0.24 Pg C yr−1) and the transfer efficiency defined as flux at 1,000 m divided by flux at 100 m (0.122 ± 0.041), with both variables exhibiting considerable regional variability. The RECCAP2 analysis presents standard ocean biological carbon pump metrics for assessing biogeochemical model skill, metrics that are crucial for further modeling efforts to resolve remaining uncertainties involving system-level interactions between ocean physics and biogeochemistry.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 7","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GB008156","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141536743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Suppression of Nitrogen Deposition on Global Forest Soil CH4 Uptake Depends on Nitrogen Status 氮沉降对全球森林土壤甲烷吸收的抑制作用取决于氮状况

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-07-03 DOI: 10.1029/2024GB008098

Xiaoyu Cen, Nianpeng He, Mingxu Li, Li Xu, Xueying Yu, Weixiang Cai, Xin Li, Klaus Butterbach-Bahl

{"title":"Suppression of Nitrogen Deposition on Global Forest Soil CH4 Uptake Depends on Nitrogen Status","authors":"Xiaoyu Cen, Nianpeng He, Mingxu Li, Li Xu, Xueying Yu, Weixiang Cai, Xin Li, Klaus Butterbach-Bahl","doi":"10.1029/2024GB008098","DOIUrl":"https://doi.org/10.1029/2024GB008098","url":null,"abstract":"Methane (CH4) is the second most important atmospheric greenhouse gas (GHG) and forest soils are a significant sink for atmospheric CH4. Uptake of CH4 by global forest soils is affected by nitrogen (N) deposition; clarifying the effect of N deposition helps to reduce uncertainties of the global CH4 budget. However, it remains an unsolved puzzle why N input stimulates soil CH4 uptake in some forests while suppressing it in others. Combining previous findings and data from N addition experiments conducted in global forests, we proposed and tested a “stimulating-suppressing-weakened effect” (“three stages”) hypothesis on the changing responses of soil CH4 flux (RCH4) to N input. Specifically, we calculated the response factors (f) of RCH4 to N input for N-limited and N-saturated forests across biomes; the phased changes in f values supported our hypothesis. We also estimated the global forest soil CH4 uptake budget to be approximately 11.2 Tg yr−1. CH4 uptake hotspots were predominantly located in temperate forests. Furthermore, we quantified that the current level of N deposition reduced global forest soil CH4 uptake by ∼3%. This suppression effect was more pronounced in temperate forests than in tropical or boreal forests, likely due to differences in N status. The proposed “three stages” hypothesis in this study generalizes the diverse effects of N input on RCH4, which could help improve experimental design. Additionally, our findings imply that by regulating N pollution and reducing N deposition, soil CH4 uptake can be significantly increased in the N-saturated forests in tropical and temperate biomes.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 7","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141536865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Role of Climate, Mineralogy and Stable Aggregates for Soil Organic Carbon Dynamics Along a Geoclimatic Gradient 气候、矿物学和稳定集聚物对沿地理气候梯度的土壤有机碳动态的作用

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-06-30 DOI: 10.1029/2023GB007934

Daniel Wasner, Rose Abramoff, Marco Griepentrog, Erick Zagal Venegas, Pascal Boeckx, Sebastian Doetterl

{"title":"The Role of Climate, Mineralogy and Stable Aggregates for Soil Organic Carbon Dynamics Along a Geoclimatic Gradient","authors":"Daniel Wasner, Rose Abramoff, Marco Griepentrog, Erick Zagal Venegas, Pascal Boeckx, Sebastian Doetterl","doi":"10.1029/2023GB007934","DOIUrl":"https://doi.org/10.1029/2023GB007934","url":null,"abstract":"Organic matter accumulation in soil is understood as the result of the dynamics between mineral-associated (more decomposed, microbial derived) organic matter and free particulate (less decomposed, plant derived) organic matter. However, from regional to global scales, patterns and drivers behind main soil organic carbon (SOC) fractions are not well understood and remain poorly linked to the pedogenetic variation across soil types. Here, we separated SOC associated with silt- and clay-sized particles (S + C), stable aggregates (>63 μm, SA) and particulate organic matter (POM) from a diverse range of grassland topsoils sampled along a geoclimatic gradient. The relative contribution of the two mineral-associated fractions (S + C & SA) to SOC differed significantly across the gradient, while POM was never the dominant SOC fraction. Stable aggregates (>63 μm) emerged as the major SOC fraction in carbon-rich soils. The degree of decomposition of carbon in stable aggregates (>63 μm) was consistently between that of the S + C and POM fractions and did not change along the investigated gradient. In contrast, carbon associated with the S + C fraction was less microbially decomposed in carbon-rich soils than in carbon-poor soils. The amount of SOC in the S + C fraction was positively correlated to pedogenic oxide contents and texture, whereas the amount of SOC associated with stable aggregates (>63 μm) was positively correlated to pedogenic oxide contents and negatively to temperature. We present a conceptual summary of our findings, which integrates the role of stable aggregates (>63 μm) with other major SOC fractions and illustrates their changing importance across (soil-)environmental gradients.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 7","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023GB007934","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen Cycling in Reservoir Drawdown Areas and the Impacts on Water Quality 水库缩减区的氮循环及其对水质的影响

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-06-26 DOI: 10.1029/2024GB008136

Dongsheng Liu, Qiuwen Chen, Taylor Maavara, Jianyun Zhang, Yuchen Chen

{"title":"Nitrogen Cycling in Reservoir Drawdown Areas and the Impacts on Water Quality","authors":"Dongsheng Liu, Qiuwen Chen, Taylor Maavara, Jianyun Zhang, Yuchen Chen","doi":"10.1029/2024GB008136","DOIUrl":"https://doi.org/10.1029/2024GB008136","url":null,"abstract":"Reservoir drawdown areas (DAs) can be both important nitrogen (N) sources to river networks and hot spots for N removal from freshwater ecosystems. The net effect of DAs on the N availability in reservoirs within a full hydrological cycle remains unclear. In this paper, the N dynamics in the DA of the Three Gorges Reservoir, Yangtze River, China, are investigated through a combination of discrete and continuous in situ observations and sampling over a span of 2 years, complemented by numerical modeling. We show that the DA is a net source of N to the water column, and that about 30% of the total annual N load released from the DA is mitigated by the sediment through denitrification and capture. The annual net load of the total N from the DA to the reservoir is ca. 0.59 kg per meter along the river, which is on the same order of magnitude as the input load from the density current of the Yangtze River to its tributaries, generally considered to be the primary driver of eutrophication in tributaries. N release in the DA mainly occurs during the drying period, whereas denitrification in the sediment mostly takes place during the flooding period when the oxido-reducing potential is low. Our findings quantify and therefore clarify the N source/sink dynamics from the DA to the reservoir, offering a new perspective on the importance of DA nutrient loading in decision-making related to integrated management of inundated lands to alleviate reservoir eutrophication by river damming.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 7","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constraints and Drivers of Dissolved Fluxes of Pyrogenic Carbon in Soil and Freshwater Systems: A Global Review and Meta-Analysis 土壤和淡水系统中热原碳溶解通量的制约因素和驱动因素：全球综述与元分析

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-06-23 DOI: 10.1029/2023GB008092

R. B. Abney, M. E. Barnes, A. Moss, F. Santos

{"title":"Constraints and Drivers of Dissolved Fluxes of Pyrogenic Carbon in Soil and Freshwater Systems: A Global Review and Meta-Analysis","authors":"R. B. Abney, M. E. Barnes, A. Moss, F. Santos","doi":"10.1029/2023GB008092","DOIUrl":"https://doi.org/10.1029/2023GB008092","url":null,"abstract":"Pyrogenic carbon (PyC) is a significant component of the global soil carbon pool due to its longer environmental persistence than other soil organic matter components. Despite PyC's persistence in soil, recent work has indicated that it is susceptible to loss processes such as mineralization and leaching, with the significance and magnitude of these largely unknown at the hillslope and watershed scales. We present a review of the work concerning dissolved PyC transport in soil and freshwater. Our analysis found that the primary environmental controls on dissolved PyC (dPyC) transport are the formation conditions and quality of the PyC itself, with longer and higher temperature charring conditions leading to less transport of dPyC. While correlations between dPyC and dissolved organic carbon in rivers and other pools are frequently reported, the slope of these correlations was pool-dependent (i.e., soil-water, precipitation, lakes, streams, rivers), suggesting site-specific environmental controls. However, the lack of consistency in analytical techniques and sample preparation remains a major challenge to quantifying environmental controls on dPyC fluxes. We propose that future research should focus on the following: (a) consistency in methodological approaches, (b) more quantitative measures of dPyC in pools and fluxes from soils to streams, (c) turnover times of dPyC in soils and aquatic systems, and (d) improved understanding of how mechanisms controlling the fate of dPyC in dynamic post-fire landscapes interact. With more refined quantitative information about the controls on dPyC transport at the hillslope and landscape scale, we can increase the accuracy and utility of global carbon models.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 6","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023GB008092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anthropogenically Driven Changes in the Carbon to Phosphorus Ratio of Marine Dissolved Organic Matter 人类活动引起的海洋溶解有机物碳磷比变化

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-06-21 DOI: 10.1029/2023GB008069

Mohanan Geethalekshmi Sreeush, Eun Young Kwon, Sun-Seon Lee, Arjun Babu Nellikkattil

{"title":"Anthropogenically Driven Changes in the Carbon to Phosphorus Ratio of Marine Dissolved Organic Matter","authors":"Mohanan Geethalekshmi Sreeush, Eun Young Kwon, Sun-Seon Lee, Arjun Babu Nellikkattil","doi":"10.1029/2023GB008069","DOIUrl":"https://doi.org/10.1029/2023GB008069","url":null,"abstract":"Marine dissolved organic matter (DOM) cycles play a pivotal role in sustaining marine ecosystems and regulating the ocean's carbon sequestration from the atmosphere. However, the response of DOM cycles, including dissolved organic carbon (DOC) and dissolved organic phosphorus (DOP), to future climate change remains highly uncertain. Using the Community Earth System Model version 2 large ensemble simulations, we find that the C:P ratios in DOM are projected to increase by up to two-fold in oligotrophic gyres by 2100. Increased upper ocean stratification reduces surface phosphate availability, thereby elevating phytoplankton C:P ratios and enhancing phytoplankton utilization of DOP, both acting to deprive DOM of P. Moreover, ocean stratification has a direct effect on exporting less DOC to the subsurface while accumulating more DOC at the sea surface. As a result of the strong sensitivity to ocean surface warming, the anthropogenically driven trends in upper ocean DOM concentration and its C:P ratios are estimated to emerge earlier from the simulated natural variability than upper ocean phosphate concentrations and net primary production—two key biogeochemical variables that are frequently monitored. This study suggests that changes in the C:P ratios of DOM could serve as a sensitive fingerprint of anthropogenic ocean warming, potentially exerting broad impacts on marine microbes. Our estimated 4% reduction in the globally integrated DOC export below 100 m is comparable to a 2% reduction in particulate organic carbon (POC) export by 2100, implying that global warming is likely to weaken the biological carbon pump through both DOC and POC.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 6","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023GB008069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141439600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Global Biogeochemical Cycle of the Rare Earth Elements 稀土元素的全球生物地球化学循环

IF 5.4 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-06-19 DOI: 10.1029/2024GB008125

V. Hatje, J. Schijf, K. H. Johannesson, R. Andrade, M. Caetano, P. Brito, B. A. Haley, M. Lagarde, C. Jeandel

{"title":"The Global Biogeochemical Cycle of the Rare Earth Elements","authors":"V. Hatje, J. Schijf, K. H. Johannesson, R. Andrade, M. Caetano, P. Brito, B. A. Haley, M. Lagarde, C. Jeandel","doi":"10.1029/2024GB008125","DOIUrl":"https://doi.org/10.1029/2024GB008125","url":null,"abstract":"To improve our understanding and guide future studies and applications, we review the biogeochemistry of the rare earth elements (REE). The REEs, which form a chemically uniform group due to their nearly identical physicochemical properties, include the lanthanide series elements plus scandium (Sc) and yttrium (Y). These elements, in conjunction with the neodymium isotopes, are powerful tools for understanding key oceanic, terrestrial, biological and even anthropogenic processes. Furthermore, their unique properties render them essential for various technological processes and products. Here, we delve into the characteristics of REE biogeochemistry and discuss normalization procedures and REE anomalies. We also examine the aqueous speciation of REEs, contributing to a better understanding of their behavior in aquatic settings, including the role of neodymium isotopes. We then focus on their environmental distribution, fractionation, and controlling processes in different environmental systems across the land-ocean continuum. In addition, we analyze sinks, sources, and the mobility of REEs, providing insights into their behavior in these environments. We further investigate the sources of anthropogenic REEs and their bioavailability, bioaccumulation, and transfer along food webs. We also explore the potential effects of climate change on the cycling, mobility and bioavailability of REEs, underlining the importance of current research in this evolving field. In summary, we provide a comprehensive review of REE behavior in the environment, from their properties and roles to their distribution and anthropogenic impacts, offering valuable insights and pinpointing key knowledge gaps.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 6","pages":""},"PeriodicalIF":5.4,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GB008125","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141435638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal and Interannual Variability in the Distribution and Removal of Terrigenous Dissolved Organic Carbon in the Amazon River Plume 亚马逊河水流中陆生溶解有机碳的分布和清除的季节性和年际性变化

IF 5.2 2区地球科学

Global Biogeochemical Cycles Pub Date : 2024-06-16 DOI: 10.1029/2023GB007995

Rachel P. Martineac, Renato M. Castelao, Patricia M. Medeiros

{"title":"Seasonal and Interannual Variability in the Distribution and Removal of Terrigenous Dissolved Organic Carbon in the Amazon River Plume","authors":"Rachel P. Martineac, Renato M. Castelao, Patricia M. Medeiros","doi":"10.1029/2023GB007995","DOIUrl":"https://doi.org/10.1029/2023GB007995","url":null,"abstract":"The Amazon River is a large source of terrigenous dissolved organic carbon (tDOC) to the Atlantic Ocean. The fate of this tDOC in the ocean remains unclear despite its importance to the global carbon cycle. Here, we used two decades of satellite ocean color to describe variability in tDOC in the Amazon River plume. Our analyses showed that tDOC distribution has a distinct seasonal pattern, reaching northwest toward the Caribbean during high discharge periods, and moving eastward entrained in the North Brazil Current retroflection during low discharge periods. Elevated tDOC content extended beyond the shelfbreak in all months of the year, suggesting that cross-shelf carbon transport occurs year-round. Maximum variability was found at the plume core, where seasonality accounted for 40% of the total variance, while interannual variability accounted for 15% of the variance. Our results revealed a seasonal pattern in tDOC removal over the shelf with increased consumption in May when river discharge is high. Anomalies in tDOC removal over the shelf with respect to the seasonal cycle were significantly correlated with anomalies in tDOC concentration offshore of the shelfbreak with a lag of 30–40 days, so that anomalously high inshore tDOC removal was associated with anomalously low tDOC content offshore. This suggests that variability in the offshore transport of tDOC in the Amazon River plume is modulated by interannual changes in tDOC removal over the shelf.","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"38 6","pages":""},"PeriodicalIF":5.2,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023GB007995","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141424885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0