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A review of physicochemical properties of dissolved organic carbon and its impact over mountain glaciers

Journal of Mountain Science 2024年第1期21卷 1-19页

作者： NIU Hewen CHEN Mengxue KANG Shichang shukla tanuj QIN Huili GAO Wanni HUANG Shihai ZHANG Fu State Key Laboratory of Cryospheric Sciences/National Field Science Observation and Research Station of Yulong Snow Mountain Cryosphere and Sustainable Development Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Politics and International Relations Lanzhou UniversityLanzhou 730000China University of Chinese Academy of Sciences Beijing 10049China Dagu Glacier Scenic and Historic Interest Area Administration Luhua TownHeishui 615715China

Investigating the characteristics and transformation of water-soluble carbonaceous matter in the cryosphere regions is important for understanding biogeochemical process in the earth ***-soluble carbonaceous matter is a heterogeneous mixture of organic compounds that is soluble in aquatic *** its importance,we still lack systematic understanding for dissolved organic carbon(DOC)in several aspects including exact chemical composition and physical interactions with microorganisms,glacier *** review presents the chemical composition and physical properties of glacier DOC deposited through anthropogenic emission,terrestrial,and biogenic *** present the molecular composition of DOC and its effect over snow albedo and associated radiative *** indicate that DOC in snow/ice is made up of aromatic protein-like species,fulvic acid-like materials,and humic acid-like ***-absorbing impurities in surface snow and glacier ice cause considerable albedo reduction and the associated radiative forcing is definitely ***-soluble carbonaceous matter dominated the carbon transport in the high-altitude glacial *** to prevailing global warming and projected increase in carbon emission,the glacial DOC is expected to release,which will have strong underlying impacts on cryosphere *** results of this work have profound implications for better understanding the carbon cycle in high altitude cryosphere regions.A new compilation of globally distributed work is required,including large-scale measurements of glacial DOC over high-altitude cryosphere regions,to overcome and address the scientific challenges to constrain climate impacts of light-absorbing impurities related processes in Earth system and climate models.

关键词： Mountain glaciers Dissolved organic carbon Molecular composition Radiative forcing

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Profound loss of microbial necromass carbon in permafrost thaw-subsidence in the central Tibetan Plateau

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Advances in Climate Change Research 2024年第4期15卷 647-657页

作者： Wen-Ting ZHOU Quan-Lian LI Shi-Chang KANG Xiao-Dong WU Tian MA Xiao-Bo WU Xin XIONG tanuj shukla Maheswar RUPAKHETI Dipesh RUPAKHETI Da-He QIN Xiu-Feng YIN Cryosphere Research Station on the Qinghai-Tibet Plateau State Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Cryospheric Science and Frozen Soil Engineering Norhwest Instiute of Eco-Evironment and ResourcesChinese Academy of Scienes Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems and College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou730020China Lushan Botanical Garden Chinese Academy of SciencesJiujiang 332900China Research Institute for Sustainability-Helmholtz Centre Potsdam Potsdam 14467Germany Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China

Climate warming is causing rapid permafrost degradation,including thaw-induced subsidence,potentially resulting in heightened carbon ***,our understanding of the levels and variations of carbon components in permafrost,particularly during the degradation process,remains *** uncertainties arising from this process lead to inaccurate assessments of the climate effects during permafrost *** vast expanses of permafrost in the Tibetan Plateau,there is limited research available on SOC components,particularly in the central Tibetan *** remarkable variations in hydrothermal conditions across different areas of the Tibetan Plateau,the existing limited studies make it challenging to assess the overall SOC components in the permafrost across the Tibetan Plateau and simulate their future *** this study,we examined the properties of soil organic carbon(SOC)and microbial necromass carbon(MicrobialNC)in a representative permafrost thaw-subsidence area at the southern edge of continuous permafrost in the central Tibetan *** results indicate that prior to the thaw-subsidence,the permafrost had a SOC content of 72.68±18.53 mg g^(-1),with MicrobialNC accounting for 49.6%.The thaw-subsidence of permafrost led to a 56.4%reduction in SOC,with MicrobialNC accounting for 70.0%of the lost *** constitutes the primary component of permafrost SOC,and it is the main component that is lost during thaw-subsidence *** in MicrobialNC are primarily correlated with factors pH,plant input,and microbial *** present study holds crucial implications for both the ecological and biogeochemical processes associated with carbon release from permafrost,and it furnishes essential data necessary for modeling the global response of permafrost to climate *** on this study and previous research,permafrost thawing in the Tibetan Plateau causes substantial loss of ***,there's remarkable heterogeneit

关键词： Tibetan Plateau Thaw-subsidence Soil organic carbon Microbial necromass carbon Amino sugars

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微塑料和纳米塑料威胁青藏高原环境

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Science Bulletin 2024年第5期69卷 589-592页

作者：张玉兰康世昌罗犀 tanuj shukla 高坛光 Deonie Allen Steve Allen Melanie Bergmann State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China School of Geography Earth and Environmental SciencesUniversity of BirminghamBirmingham 200003UK Ocean Frontiers Institute Dalhousie UniversityHalifax B3H 4R2Canada Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung Bremerhaven D-27515Germany University of Chinese Academy of Sciences Beijing 100049China

Plastic pollution is a planetary level threat which affects Earth’s environment and *** the poles to deep ocean basins,the growth of plastic waste has already exceeded its *** projected increase of plastic production and waste generation over the coming years makes the situation even more *** after stagnation in 2020 due to the COVID-19 pandemic,the global plastic production has also increased from 335 to 391 million metric tons(Mt)between 2016 and 2021(Fig.S1 online);yet currently post-consumer recycled and bio-based/attributed plastics only accounts~9%of the world’s plastic production[1].Statistically.

关键词：微塑料 attributed plastics

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Deposition of atmospheric pollutant and their chemical characterization in snow pit profile at Dokriani Glacier,Central Himalaya

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Journal of Mountain Science 2018年第10期15卷 2236-2246页

作者： Shipika SUNDRIYAL tanuj shukla Lekhendra TRIPATHEE Dwarika Prashad DOBHAL Sameer Kumar TIWARI Uday BHAN Centre for Glaciology Wadia Institute of Himalayan GeologyDehradun-248001UtturakhandIndia National Institute of Hydrology Roorkee-247667UttarakhandIndia Indian Institute oj:Technology Kanpur-208016Uttar PradeshIndia State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Wadia Institute of Himalayan Geology Dehradun-248001UttarakhandIndia University of Petroleum and Energy Studies BidholiDehradun-248001UttarakhandIndia

The uncertainty in assessing the numerous atmospheric pollutants transported via wind from arid and semi-arid regions is affecting the glacial ecosystem. In our study area due to the complexity of the system, a prominent seasonal difference noticed among major ions(Ca^(2+), Mg^(2+), SO_4^(2-), and NO_3^-). There is a need for understanding the ions cycling as a whole and the directionality of the feedback loops in the system. Therefore, we provide an appraisal of our current hypothesis for seasonal difference in major ion concentration from snow samples for two corresponding years(2013 and 2015) at Dokriani Glacier. A systematic study of chemical compositionsin the shallow snow pit from Dokriani Glacier was undertaken for the pre-monsoon season to understand the cycling of major ions from atmosphere to solute acquisition process. The intimating connections of ions cycling in snow and its temporal behavior was observed and analyzed through various statistical tests. Among major ions, the SO_4^(2-)has the highest concentration among anions on an average considered as 14.21% in 2013 and 29.46% in 2015. On the other side Ca^(2+) is the dominant cation contributing 28.22% in 2013 and 15.3% in 2015 on average. The average ratio of Na+/Cl-was higher in 2013 whereas lower in 2015. The backward trajectory analysis suggests the possible sources of the ions transported from Central Asia through the Western Disturbance(WD) as a prominent source of winter precipitation mainly in the Central Himalaya. Ionicconcentration of Ca^(2+) in cations was highly dominated while in anion SO_4^(2-)played the major role. Factor analysis and correlation matrix suggested that, the precipitation chemistry is mostly influenced by anthropogenic, crustal, and sea salt sources over the studied region. The elemental cycling through ocean, atmosphere and biosphere opens up new ways to understand the geochemical processes operating at the glacierized catchments of the Himalaya. Moreover, increasing the

关键词： Western disturbance Central Himalaya Factor analysis Correlation analysis Snow Stratigraphy Atmospheric pollutants

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Analytical characteristics of a qPCR-based molecular diagnostic assay-conceptual considerations for laboratory personnel

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The Journal of Biomedical Research 2014年第3期28卷 246-248页

作者： tanuj shukla Prabhakar Rao Kaipa Shesheer K Munpally Rachana Tripathi Department of Genetics and Biotechnology Osmania University RAS Lifesciences Pvt.Ltd.

Dear Editor：Quantitative real-time PCR has revolutionized molecular diagnostics with its ease of use,increased sensitivity and specificity and low turnaround ***/quantitative PCR（qPCR）-based assays offer a distinct advantage over other serological/conventional diagnostic *** ability to diagnose infectious diseases has benefited from the availability of US FDA approved and Conformite Europeenne（CE）-marked qPCR-based in-vitro diagnostic kits from international *** high-quality kits are calibrated with the World Health Organization（WHO）reference standards and the National Institute for Biological Standards and Control（NIBSC）standards.

关键词： qPCR Analytical characteristics of a qPCR-based molecular diagnostic assay-conceptual considerations for laboratory personnel

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