Limnology and Oceanography: Methods最新文献

{"title":"Development of a fast-response system with integrated calibration for high-resolution mapping of dissolved methane concentration in surface waters","authors":"Jesse T. Dugan,&nbsp;Thomas Weber,&nbsp;John D. Kessler","doi":"10.1002/lom3.10609","DOIUrl":"10.1002/lom3.10609","url":null,"abstract":"<p>Dissolved gas concentrations in surface waters can have sharp gradients across marine and freshwater environments, which often prove challenging to capture with analytical measurement. Collecting discrete samples for laboratory analysis provides accurate results, but suffers from poor spatial resolution. To overcome this limitation, water equilibrators and gas membrane contactors (GMCs) have been used for the automated underway measurement of dissolved gas concentrations in surface water. However, while water equilibrators can provide continuous measurements, their analytical response times to changes in surface water concentration can be slow, lasting tens of minutes. This leads to spatial imprecisions in the dissolved gas concentration data. Conversely, while GMCs have proven to have much faster analytical response times, often lasting only a few minutes or less, they suffer from poor accuracy and thus require routine calibration. Here we present an analytical system for the high accuracy and high precision spatial mapping of dissolved methane concentration in surface waters. The system integrates a GMC with a cavity ringdown spectrometer for fast analytical response times, with a calibration method involving two Weiss-style equilibrators and discrete measurements in vials. Data from both the GMC and equilibrators are collected simultaneously, with discrete vial samples collected periodically throughout data collection. We also present a mathematical algorithm integrating all data collected for the routine calibration of the GMC dataset. The algorithm facilitates comparison between the GMC and equilibrator datasets despite the substantial differences in response times (0.7–2.1 and 4.1–17.6 min, respectively). This measurement system was tested with both systematic laboratory experiments and field data collected on a research cruise along the US Atlantic margin. Once calibrated, this system identified numerous sharp peaks of dissolved methane concentration in the US Atlantic margin dataset that would be poorly resolved, or outright missed with previous measurement techniques. Overall, the precision and accuracy for the technique presented here were determined to be 11.2% and 10.4%, respectively, the operating range was 0–1000 ppm methane, and the <i>e</i>-folding response time to changes in dissolved methane concentration was 0.7–2.1 min.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 5","pages":"321-332"},"PeriodicalIF":2.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In vivo injection of exogenous molecules into octocorals: Application to the study of calcification","authors":"Clémence Forin,&nbsp;Guillaume Loentgen,&nbsp;Denis Allemand,&nbsp;Sylvie Tambutté,&nbsp;Philippe Ganot","doi":"10.1002/lom3.10610","DOIUrl":"10.1002/lom3.10610","url":null,"abstract":"<p>In vivo studies of the effects of molecules of interest, such as hormones or xenobiotics on corals, are essential to uncover their effects on coral biological processes. However, exposure to such molecules is very challenging in aquarium systems due to the duration of exposure, the high cost of the compounds, their quantity, and their diffusion in seawater. In this study, we provide a durable alternative method by in vivo injection. The aim of this study was to evaluate slow release and local injection as a novel method of delivering compounds to corals. In this method, coconut oil, which solidifies upon injection and has a melting point of about 24°C, is used as the vehicle for injection. Local diffusion of the injected products in the organism was followed using visual tracers. Specifically, two classes of fluorescent markers were used, one of which examined internalization into cells (rhodamine), while the others were used as an application to monitor the calcification process (alizarin, calcein). In parallel, we developed an analytical method to quantify the calcein and alizarin labeling of sclerites, which allowed us to determine calcification rates in different parts of the coral. Two octocorals were used to optimize these methods, with <i>Sarcophyton</i> sp. being the preferred organism to develop and validate the injection procedures and characterize the diffusion of the markers. Once the method was perfected, injections were performed on the precious coral <i>Corallium rubrum</i> to prove the transferability of the method.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 5","pages":"333-350"},"PeriodicalIF":2.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lom3.10610","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"An improved method to quantify bulk carbohydrate in marine planktonic samples","authors":"Ying-Yu Hu,&nbsp;Andrew J. Irwin,&nbsp;Zoe V. Finkel","doi":"10.1002/lom3.10614","DOIUrl":"10.1002/lom3.10614","url":null,"abstract":"<p>The TPTZ (2,4,6-tripyridyl-<i>s</i>-triazine) method is used to detect monosaccharides from seawater and particulate matter samples because it is sensitive, precise, rapid and easy to perform. Contrary to mechanisms proposed in the literature, we provide evidence that the TPTZ method detects hydroxyl as well as aldehyde groups in monosaccharides when all reducing groups are fully deprotonated in alkaline medium. We use this insight to develop an optimized hydrolysis protocol to increase yields from polysaccharides while minimizing the dehydration of monosaccharides. Compared to the TPTZ method with commonly used hydrolysis protocols and the often-used phenol–sulfuric acid method, our new optimized method detects a wider range of carbohydrates with a more consistent yield relative to glucose and much lower coefficient of variation. When applied to phytoplankton cultures and marine particulate samples, our new method achieves significantly higher bulk carbohydrate yields.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 6","pages":"399-415"},"PeriodicalIF":2.7,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lom3.10614","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140322439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Interpreting biogeochemical processes through the relationship between total alkalinity and dissolved inorganic carbon: Theoretical basis and limitations","authors":"Hang Yin,&nbsp;Lei Jin,&nbsp;Xinping Hu","doi":"10.1002/lom3.10608","DOIUrl":"10.1002/lom3.10608","url":null,"abstract":"<p>The marine carbonate system is influenced by anthropogenic CO₂ uptake, biogeochemical processes, and physical changes that involve freshwater input and removal. Two frequently used parameters to quantify seawater carbonate system are total alkalinity (TA) and total dissolved inorganic carbon (DIC). To account for the physical changes, both TA and DIC are usually normalized to a reference salinity (i.e., nTA and nDIC), and then the relationship between nTA and nDIC is used to identify major biogeochemical processes that regulate the carbonate system, based on process-specific reaction stoichiometry. However, the theoretical basis of this interpretation has not been holistically examined. In this study, we validated this method under  idealized conditions and discussed the associated assumptions and limitations. Furthermore, we applied this method to interpret field TA and DIC data from a lagoonal estuary in the northwestern Gulf of Mexico. Our results demonstrated that evaluating field data that encompass multiple stations and time periods could be problematic. In addition, various combinations of biogeochemical processes can lead to the same nTA–nDIC relationship, even though the relative importance of each individual process may vary significantly. Therefore, the stoichiometric relationship relying solely on TA and DIC data is not a definitive approach for uncovering dominant biogeochemical processes. Instead, measurements of process-specific parameters are necessary.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 5","pages":"311-320"},"PeriodicalIF":2.7,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140128654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A video monitoring and computational system for estimating migratory juvenile fish abundance in river systems","authors":"Meghna N. Marjadi,&nbsp;Sidney Batchelder,&nbsp;Ryan Govostes,&nbsp;Allison H. Roy,&nbsp;John J. Sheppard,&nbsp;Meghan-Grace Slocombe,&nbsp;Joel K. Llopiz","doi":"10.1002/lom3.10607","DOIUrl":"10.1002/lom3.10607","url":null,"abstract":"<p>Diadromous fishes migrate between marine and fresh waters for reproduction. For anadromous species, which spawn in freshwater, improved access to freshwater spawning and nursery habitats and ability of juveniles to emigrate to the ocean may support population recovery. Despite the potentially enormous influence of early life stage survival on adult population size, managers and scientists have limited capacity to assess numbers of juvenile anadromous fishes leaving freshwater ecosystems. Such data are critical for evaluating reproductive success and habitat suitability and have been identified as a top priority in anadromous fish research and management. We developed a state-of-the-art underwater video and computational system to collect videos to estimate abundances and migration timing for juvenile river herring (<i>Alosa pseudoharengus</i>; <i>Alosa aestivalis</i>). We collected continuous video in the Monument River (Bourne, Massachusetts, USA) from June to November 2017. We trained three types of neural network models to detect and count fish in video frames and evaluated model performance by comparing human counts to model outputs. Our top model assessed presence and absence (<i>F</i>1 = 87%) and counted fish (counting error 9.4%) with an accuracy comparable to human counters (<i>F</i>1 = 88%). Our system's capability to collect accurate counts of emigrating juveniles will provide critical information that could be related to the numbers of spawning adults, system-specific productivity, and spawning and nursery habitat suitability. Both the video collection system and computational model may be transferrable to other sites and for other species where tracking juvenile emigration may inform management efforts.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 5","pages":"295-310"},"PeriodicalIF":2.7,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140128647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new framework for estimating abundance of animals using a network of cameras","authors":"Camille Magneville,&nbsp;Capucine Brissaud,&nbsp;Valentine Fleuré,&nbsp;Nicolas Loiseau,&nbsp;Thomas Claverie,&nbsp;Sébastien Villéger","doi":"10.1002/lom3.10606","DOIUrl":"10.1002/lom3.10606","url":null,"abstract":"<p>While many ecology studies require estimations of species abundance, doing so for mobile animals in an accurate, non-invasive manner remains a challenge. One popular stopgap method involves the use of remote video-based surveys using several cameras, but abundance estimates derived from this method are computed with conservative metrics (e.g., <i>maxN</i> computed as the maximum number of individuals seen simultaneously on a single video). We propose a novel methodological framework based on a remote-camera network characterized by known positions and non-overlapping field-of-views. This approach involves a temporal synchronization of videos and a maximal speed estimate for studied species. Such a design allows computing a new abundance metric called <i>Synchronized maxN</i> (<i>SmaxN</i>). We provide a proof-of-concept of this approach with a network of nine remote underwater cameras that recorded fish for three periods of 1 h on a fringing reef in Mayotte (Western Indian Ocean). We found that abundance estimation with <i>SmaxN</i> yielded up to four times higher values than <i>maxN</i> among the six fish species studied. <i>SmaxN</i> performed better with an increasing number of cameras or longer recordings. We also found that using a network of synchronized cameras for a short time period performed better than using a few cameras for a long duration. The <i>SmaxN</i> algorithm can be applied to many video-based approaches. We built an open-sourced R package to encourage its use by ecologists and managers using video-based censuses, as well as to allow for replicability with <i>SmaxN</i> metric.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 4","pages":"268-280"},"PeriodicalIF":2.7,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140010982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automated monitoring of early life-stage development in Atlantic cod (Gadus morhua) embryos exposed to a reference toxicant","authors":"David R. Williamson,&nbsp;Ron R. Togunov,&nbsp;Emlyn J. Davies,&nbsp;Martin Ludvigsen,&nbsp;Bjørn Henrik Hansen","doi":"10.1002/lom3.10599","DOIUrl":"10.1002/lom3.10599","url":null,"abstract":"<p>Early life stages of fish are widely used for regulatory toxicity testing, and marine fish display high sensitivity to pollutant exposure. Exposure to pollutants during embryogenesis causes acute effects on embryonic development and survival, but also sub-lethal impacts manifested as maldeveloped larvae. Acquiring time- and exposure-dependent responses to pollutant exposure and other stressors in small organisms is labor intensive and often subjective. This leads to studies obtaining small sample sizes, with measurements often made infrequently during development. Automated monitoring methods can maintain consistency between measurements and allow many more measurements to be made, improving the quantity and quality of such data. We exposed Atlantic cod embryos to 3,4-dichloroaniline, a reference chemical widely used as a positive control agent in regulatory fish embryo toxicity testing. We monitored their growth through daily imaging with an automated flow-through imaging system. Biologically relevant sublethal endpoints were estimated from these images with a neural network and traditional machine vision methods. We demonstrate the automated capture and analysis of tens of thousands of images, producing detailed morphometric data from hundreds of fish over a 10-d study period, and assess the effectiveness of the automated system. The automated method presented allows measurements to be made frequently without sacrificing the sampled organisms, making detailed time series of development obtainable. We show dose-dependent effects of the toxicant on development and capture nonlinear responses that would not be attainable under a conventional manual sampling regime.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 3","pages":"170-189"},"PeriodicalIF":2.7,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lom3.10599","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Investigating the impacts of solid phase extraction on dissolved organic matter optical signatures and the pairing with high-resolution mass spectrometry data across a freshwater stream network","authors":"J. Alan Roebuck Jr,&nbsp;Allison N. Myers-Pigg,&nbsp;Vanessa Garayburu-Caruso,&nbsp;James Stegen","doi":"10.1002/lom3.10603","DOIUrl":"10.1002/lom3.10603","url":null,"abstract":"<p>Advancing our understanding of dissolved organic matter (DOM) chemistry in aquatic systems necessitates the integration of data streams from multiple analytical platforms. Some measurements require pretreatment with solid phase extraction (SPE), while others are performed directly on whole water samples. Evidence has suggested that SPE will be biased against select DOM fractions, leading to concerns over the ability to establish data linkages across platforms with variable needs for SPE pretreatment, such as those from optical measurements and those that provide high-resolution molecular information. Here, we directly addressed this concern by assessing the impact of SPE on DOM optical properties through excitation–emission matrices with parallel factor analysis (PARAFAC) for 47 samples across a stream network within a single watershed reflective of variable DOM sources. PARAFAC data was further paired with molecular information obtained by Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS). A comparison of PARAFAC models first revealed no systematic qualitative differences in major components between whole water DOM and DOM isolated by SPE (SPE-DOM); however, quantitative biases against select components were observed. Further linkages with FTICR-MS data revealed that the molecular fingerprint associated with each PARAFAC component was consistent between the whole water DOM and SPE-DOM. Our results suggest that bulk scale linkages across these analytical platforms could be inferred irrespective of the observed quantitative biases resulting from SPE for samples within this example watershed. This work represents a key step toward the systematic evaluation of linkages between optical and high-resolution mass spectrometry datasets in freshwater lotic environments.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 4","pages":"241-253"},"PeriodicalIF":2.7,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lom3.10603","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Lotic-SIPCO2: Adaptation of an open-source CO2 sensor system and examination of associated emission uncertainties across a range of stream sizes and land uses","authors":"Andrew L. Robison,&nbsp;Lauren E. Koenig,&nbsp;Jody D. Potter,&nbsp;Lisle E. Snyder,&nbsp;Christopher W. Hunt,&nbsp;William H. McDowell,&nbsp;Wilfred M. Wollheim","doi":"10.1002/lom3.10600","DOIUrl":"10.1002/lom3.10600","url":null,"abstract":"<p>River networks play a crucial role in the global carbon cycle, as relevant sources of carbon dioxide (CO₂) to the atmosphere. Advancements in high-frequency monitoring in aquatic environments have enabled measurement of dissolved CO₂ concentration at temporal resolutions essential for studying carbon variability and evasion from these dynamic ecosystems. Here, we describe the adaptation, deployment, and validation of an open-source and relatively low-cost in situ <i>p</i>CO₂ sensor system for lotic ecosystems, the lotic-SIPCO2. We tested the lotic-SIPCO2 in 10 streams that spanned a range of land cover and basin size. Key system adaptations for lotic environments included prevention of biofouling, configuration for variable stage height, and reduction of headspace equilibration time. We then examined which input parameters contribute the most to uncertainty in estimating CO₂ emission rates and found scaling factors related to the gas exchange velocity were the most influential when CO₂ concentration was significantly above saturation. Near saturation, sensor measurement of <i>p</i>CO₂ contributed most to uncertainty in estimating CO₂ emissions. We also found high-frequency measurements of <i>p</i>CO₂ were not necessary to accurately estimate median emission rates given the CO₂ regimes of our streams, but daily to weekly sampling was sufficient. High-frequency measurements of <i>p</i>CO₂ remain valuable for exploring in-stream metabolic variability, source partitioning, and storm event dynamics. Our adaptations to the SIPCO2 offer a relatively affordable and robust means of monitoring dissolved CO₂ in lotic ecosystems. Our findings demonstrate priorities and related considerations in the design of monitoring projects of dissolved CO₂ and CO₂ evasion dynamics more broadly.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 4","pages":"191-207"},"PeriodicalIF":2.7,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lom3.10600","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 temperature-controlled, circular maintenance system for studying growth and development of pelagic tunicates (salps)","authors":"Svenja J. Müller,&nbsp;Wiebke Wessels,&nbsp;Sara Driscoll,&nbsp;Evgeny A. Pakhomov,&nbsp;Lutz Auerswald,&nbsp;Katharina Michael,&nbsp;Bettina Meyer","doi":"10.1002/lom3.10605","DOIUrl":"10.1002/lom3.10605","url":null,"abstract":"<p>Salps have attracted attention as zooplankton organisms that may be able to expand their habitat range and increase their ecological importance in the face of ongoing global warming. Due to their gelatinous nature, unique feeding strategy, and reproductive ecology such changes could have profound impacts on regional marine ecosystems. While their role in the regional carbon cycle is receiving attention, our knowledge of their physiology and life cycle is still limited. This knowledge gap is mainly due to their fragile gelatinous nature, which makes it difficult to capture and maintain intact specimen in the laboratory. We present here a modified kreisel tank system that has been tested onboard a research vessel with the Southern Ocean salp <i>Salpa thompsoni</i> and at a research station with <i>Salpa fusiformis</i> and <i>Thalia democratica</i> from the Mediterranean Sea. Successful maintenance over days to weeks allowed us to obtain relative growth and developmental rates comparable to in situ field samples of <i>S. thompsoni</i> and <i>S. fusiformis</i>, and provided insights into previously unknown features of their life cycle (e.g., testes development). Our results show that traditional methods of estimating growth, such as cohort analysis, may lead to a general overestimation of growth rates and neglect individual strategies (e.g., shrinkage), which can affect the results and conclusions drawn from population dynamic models. By providing a starting point for the successful maintenance of different species, comparable experiments on the physiology of salps is made possible. This will contribute to refining model parameters and improving the reliability of the predictions.</p>","PeriodicalId":18145,"journal":{"name":"Limnology and Oceanography: Methods","volume":"22 5","pages":"281-294"},"PeriodicalIF":2.7,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lom3.10605","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}