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An improved typhoon monitoring model based on precipitable water vapor and pressure

Geodesy and Geodynamics 2024年第3期15卷 276-290页

作者： Junyu Li Haojie Li Lilong Liu Jiaqing Chen Yibin Yao Mingyun Hu Liangke Huang Fade Chen Tengxu Zhang Lv Zhou College of Geomatics and geoinformation Guilin University of TechnologyGuilin 541006China Guangxi Key Laboratory of Spatial Information and Geomatics Guilin 541006China Qinzhou Institute of Surveying and Mapping for Housing and Urban-Rural Development Co. Ltd.Qinzhou 535000China School of Geodesy and Geomatics Wuhan UniversityWuhan 430079China School of Resources and Environmental science and Engineering Hubei University of Science and TechnologyXianning 437100China

The potential of monitoring the movement of typhoons using the precipitable water vapor(PWV) has been confirmed. However, monitoring the movement of typhoon is focused on PWV, making it difficult to describe the movement of a typhoon in detail minutely and resulting in insufficient accuracy. Hence,based on PWV and meteorological data, we propose an improved typhoon monitoring mode. First, the European centre for Medium-Range Weather Forecasts Reanalysis 5-derived PWV(ERA5-PWV) and the Global Navigation Satellite System-derived PWV(GNSS-PWV) were compared with the reference radiosonde PWV(RS-PWV). Then, using the PWV and atmospheric parameters derived from ERA5, we discussed the anomalous variations of PWV, pressure(P), precipitation, and wind speed during different typhoons. Finally, we compiled a list of critical factors related to typhoon movement, PWV and P. We developed an improved multi-factor typhoon monitoring mode(IMTM) with different models(i.e.,IMTM-I and IMTM-II) in different cases with a higher density of GNSS observation or only Numerical Weather Prediction(NWP) data. The IMTM was evaluated through the reference movement speeds of HATO and Mangkhut from the China Meteorological Observatory Typhoon Network(CMOTN). The results show that the root mean square(RMS) of the IMTM-I is 1.26 km/h based on ERA5-P and ERA5-PWV,and the absolute bias values are mostly within 2 km/h. Compared with the models considering the single factor ERA5-P/ERA5-PWV, the RMS of the IMTM-I is improved by 26.3% and 38.5%, respectively. The IMTM-II model manifests a residual of only 0.35 km/h. Compared with the single-factor model based on GNSS-PWV/P, the residual of the IMTM-II model is reduced by 90.8% and 84.1%, respectively. These results propose that the typhoon movement monitoring approach combining PWV and P has evident advantages over the single-factor model and is expected to supplement traditional typhoon monitoring.

关键词： Typhoon GNSS/ERA5 PWV Pressure Monitoring Improved model

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Estimation of soil erosion risk within a small mountainous sub-watershed in kerala,India,using Revised Universal Soil Loss Equation(RUSLE) and geo-information technology

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Geoscience Frontiers 2012年第2期3卷 209-215页

作者： V.Prasannakumar H.Vijith S.Abinod N.Geetha centre for geoinformation science and technology university of kerala

A comprehensive methodology that integrates Revised Universal Soil Loss Equation （RUSLE） model and Geographic Information System （GIS） techniques was adopted to determine the soil erosion vulner- ability of a forested mountainous sub-watershed in kerala, India. The spatial pattern of annual soil erosion rate was obtained by integrating geo-environmental variables in a raster based GIS method. GIS data layers including, rainfall erosivity （R）, soil erodability （K）, slope length and steepness （LS）, cover management （C） and conservation practice （P） factors were computed to determine their effects on average annual soil loss in the area. The resultant map of annual soil erosion shows a maximum soil loss of 17.73 t h-1 y i with a close relation to grass land areas, degraded forests and deciduous forests on the steep side-slopes （with high LS ）. The spatial erosion maps generated with RUSLE method and GIS can serve as effective inputs in deriving strategies for land planning and management in the environmentally sensitive mountainous areas.

关键词： Soil erosion Revised Universal Soil Loss Equation (RUSLE)GIS Pamba Western Ghats kerala

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Applicability of SRTM data for landform characterisation and geomorphometry: a comparison with contour-derived parameters

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International Journal of Digital Earth 2011年第5期4卷 387-401页

作者： V.Prasannakumar RShiny NGeetha HVijith centre for geoinformation science and technology University of KeralaKariavattomThiruvananthapuramKerala 695581India

Geomorphologic and hydrologic research heavily depends on digital elevation models(DEM)which are currently being prepared from digital *** present study examines the use and applicability of freely available global elevation data source(3 arc seconds finished Shuttle Radar Topography Mission(SRTM))in landform characterisation,geomorphometry,river basin studies and other allied scientific applications in comparison with contour elevation data derived from the surveyed topographical *** relief data extracted from a conventionally digitised geo-information science dataset of topographic contours(1:50,000)are compared with the SRTM-DEM and the variations are *** automated geomorphometric and landform parameters derived from the contour DEM and the computed statistical properties of those parameters have substantial agreement with the same parameters derived from the *** the same time,localised variations also exist in some spatial *** landscape analysis outputs from the SRTM-DEM suggest the wide acceptability and applicability of the freely available SRTM data source,especially in the regional scale applications related to hydrological modelling,terrain characterisation,disaster management and land degradation studies.

关键词： geomorphometry landform characterisation SRTM wetness index terrain position index

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The ALMA-QUARKS Survey.Ⅱ.The ACA 1.3 mm Continuum Source Catalog and the Assembly of Dense Gas in Massive Star-Forming Clumps

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Research in Astronomy and Astrophysics 2024年第6期24卷 119-139页

作者：许峰玮 Ke Wang Tie Liu Lei Zhu Guido Garay Xunchuan Liu Paul Goldsmith Qizhou Zhang Patricio Sanhueza Shengli Qin Jinhua He Mika Juvela Anandmayee Tej Hongli Liu Shanghuo Li Kaho Morii Siju Zhang Jianwen Zhou Amelia Stutz Neal JEvans Kee-Tae Kim Shengyuan Liu Diego Mardones Guangxing Li Leonardo Bronfman Ken’ichi Tatematsu Chang Won Lee Xing Lu Xiaofeng Mai Sihan Jiao James O.Chibueze Keyun Su Viktor L.Tóth Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Chinese Academy of sciences South America Center for Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Departamento de Astronomía Universidad de ChileLas Condes7591245 SantiagoChile Jet Propulsion Laboratory California Institute of Technology4800 Oak Grove DrivePasadena CA 91109USA Center for Astrophysics|Harvard&Smithsonian 60 Garden StreetCambridgeMA 02138USA National Astronomical Observatory of Japan National Institutes of Natural Sciences2-21-1 OsawaMitakaTokyo 181-8588Japan Astronomical science Program The Graduate University for Advanced StudiesSOKENDAI2-21-1 OsawaMitakaTokyo 181-8588Japan School of Physics and Astronomy Yunnan UniversityKunming 650091China Yunnan Observatories Chinese Academy of SciencesKunming 650216China Department of Physics University of HelsinkiPO Box 64FI-00014 HelsinkiFinland Indian Institute of Space science and technology Thiruvananthapuram 695547KeralaIndia Max Planck Institute for Astronomy Königstuhl 17D-69117 HeidelbergGermany Department of Astronomy Graduate School of ScienceThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-0033Japan Max-Planck-Institut für Radioastronomie Auf dem Hügel 6953121 BonnGermany Departamento de AstronomÂıa Universidad de ConcepcionCasilla 160-CConcepci onChile Department of Astronomy The University of Texas at AustinTexas 78712-1205USA Korea Astronomy and Space science Institute 776 Daedeokdae-roYuseong-guDaejeon 34055Republic of Korea Institute of Astronomy and Astrophysics Academia SinicaRoosevelt RoadTaipei 10617TaiwanChina South-Western Institute for Astronomy Research Yunnan UniversityKunming 650091China Korea Astronomy and Space science Institute 776 Daedeok-daeroYuseong-guDaejeon 34055Republic of

Leveraging the high resolution,sensitivity,and wide frequency coverage of the Atacama Large Millimeter/submillimeter Array(ALMA),the QUARKS survey,standing for“Querying Underlying mechanisms of massive star formation with ALMA-Resolved gas Kinematics and Structures”,is observing 139 massive starforming clumps at ALMA Band 6(λ~1.3 mm).This paper introduces the Atacama Compact Array(ACA)7 m data of the QUARKS survey,describing the ACA observations and data *** multiwavelength data,we provide the first edition of QUARKS atlas,offering insights into the multiscale and multiphase interstellar medium in high-mass star *** ACA 1.3 mm catalog includes 207 continuum sources that are called ACA *** gas kinetic temperatures are estimated using three formaldehyde transitions with a non-LTE radiation transfer model,and the mass and density are derived from a dust emission *** ACA sources are massive(16–84 percentile values of 6–160 M_(⊙)),gravity-dominated(M∝R^(1.1))fragments within massive clumps,with supersonic turbulence(M>1)and embedded star-forming *** find a linear correlation between the masses of the fragments and the massive clumps,with a ratio of 6%between the *** considering fragments as representative of dense gas,the ratio indicates a dense gas fraction(DGF)of 6%,although with a wide scatter ranging from 1%to 10%.If we consider the QUARKS massive clumps to be what is observed at various scales,then the size-independent DGF indicates a self-similar fragmentation or collapsing mode in protocluster *** the ACA data over four orders of magnitude of luminosity-to-mass ratio(L/M),we find that the DGF increases significantly with L/M,which indicates clump evolutionary *** observed a limited fragmentation at the subclump scale,which can be explained by a dynamic global collapse process.

关键词： stars:formation ISM:kinematics and dynamics ISM:clouds stars:protostars

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Hydrocarbon fluid inclusions and source rock parameters:A comparison from two dry wells in the western offshore,India

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Geoscience Frontiers 2023年第1期14卷 64-78页

作者： Silpa Thankan V.Nandakumar S.Shivapriya National Facility for Geofluids Research and Raman Analysis National Centre for Earth Science StudiesMinistry of Earth SciencesGovernment of IndiaThiruvananthapuram 695011KeralaIndia Department of Geology University of KeralaThiruvananthapuram 695581KeralaIndia

Fluid inclusions represent the direct evidence of paleofluids and can provide valuable information on the evolution of sedimentary basins and oil-bearing *** fluid inclusion(s)(HCFIs)are the vestiges of oil from the geological *** paper delineates the paleotemperature(T_(h))/oil window,the oil quality of HCFIs and Raman peaks corresponding to hydrocarbon species of HCFIs using fluid inclusion techniques,and source rock potential of hydrocarbon generation,thermal maturity,the quantity of organic matter,and the kerogen types obtained through Rock-Eval pyrolysis data from two dry wells RV-1 well of Mumbai offshore and KKD-1A well of kerala-Konkan *** present study compares the fluid inclusion parameters as well as the source rock geochemical characteristics of these two dry wells to address the scientific problem of the wells going ***,evaluated whether the results agree with an earlier finding from a case study of two wells named KK4C-Al(kerala-Konkan basin)and RV-1 well where only a few parameters such as temperature of homogenization(T_(h))&API gravity were utilised,and the chances of getting oil in the nearby areas of these two wells were *** the present study,the fluid inclusion parameters such as the palaeotemperature(T_(h)),API Gravity and Raman spectra were obtained from micron sized fluid inclusions at different depths for a quick assessment of nature of oil inclusions within the two dry *** with fluid inclusion parameters,different source rock parameters obtained from Rock-Eval Pyrolysis analysis(secondary data)such as S1,S2,S3,(T_(max)),Hydrogen Index(HI),Oxygen Index(OI),Potential Yield(PY),Production Index(PI)and Total Organic Carbon Content(TOC)were also considered for a detailed source-rock evaluation of two wells(RV-1 and KKD-1A)and the results act as the supporting evidence to address the reason for the wells gone *** of homogenisation(T_(h))of hydrocarbon Fluid Inclusion Assemblages(F

关键词： Hydrocarbon fluid inclusions(HCFIs) Spectroscopic analysis Oil window API gravity Rock-Eval pyrolysis

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Synthetic biology for sustainable food ingredients production:recent trends

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Systems Microbiology and Biomanufacturing 2023年第1期3卷 137-149页

作者： K.B.Arun A.N.Anoopkumar Raveendran Sindhu Parameswaran Binod Embalil Mathachan Aneesh Aravind Madhavan Mukesh Kumar Awasthi Rajiv Gandhi centre for Biotechnology JagathyThiruvananthapuram 695014KeralaIndia Department of Life sciences CHRIST(Deemed to be University)Bengaluru 560029KarnatakaIndia Department of Zoology Centre for Research in Emerging Tropical Diseases(CRET-D)University of CalicutMalappuramKeralaIndia Department of Food technology T K M Institute of TechnologyKollam 691505KeralaIndia Microbial Processes and technology Division CSIR-National Institute for Interdisciplinary Science and Technology(CSIR-NIIST)Trivandrum 695019KeralaIndia School of Biotechnology Amrita Vishwa VidyapeethamAmritapuriKeralaIndia College of Natural Resources and Environment Northwest A&F UniversityYangling 712100ShaanxiChina

Problems with food security result from increased population,global warming,and decrease in cultivable *** the advancements in synthetic biology,microbial synthesis of food is considered to be an efficient alternate approach that could permit quick food biosynthesis in an eco-friendly ***,synthetic biology can be assumed to the synthesis of healthy or specially designed food components like proteins,lipids,amino acids and vitamins and widen the consumption of feedstocks,thus offering possible resolutions to high-quality food *** review describes the impact of synthetic biology for the microbial synthesis of various food ingredients production.

关键词： Synthetics biology Cell factory Metabolic engineering Food ingredients Fermentation

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Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay

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Satellite Navigation 2022年第3期3卷 221-230,I0005页

作者： Ge Zhu Liangke Huang Yunzhen Yang Junyu Li Lv Zhou Lilong Liu College of Geomatics and geoinformation Guilin University of TechnologyGuilin541004China College of Resources and Environment Beibu Gulf UniversityQinzhou535011China

Tropospheric delay is an important factor affecting high precision Global Navigation Satellite System(GNSS)positioning and also the basic data for GNSS atmospheric ***,the existing tropospheric delay models have some problems,such as only a single function used for the entire *** this paper,an ERA5-based(the fifth generation of European centre for Medium-Range Weather Forecasts Reanalysis)global model for vertical adjustment of Zenith Tropospheric Delay(ZTD)using a piecewise function is *** ZTD data at 611 radiosonde stations and the MERRA-2(second Modern-Era Retrospective analysis for Research and Applications)atmospheric reanalysis data were used to validate the model *** Global Zenith Tropospheric Delay Piecewise(GZTD-P)model has excellent performance compared with the Global Pressure and Temperature(GPT3)*** at radiosonde stations,the performance of the GZTD-P model was improved by 0.96 cm(23%)relative to the GPT3 *** with MERRA-2 data,the quality of the GZTD-P model is improved by 1.8 cm(50%)compared to the GPT3 model,showing better accuracy and *** ZTD vertical adjustment model with different resolutions was established to enrich the model's applicability and speed up the process of tropospheric delay *** providing model parameters with different resolutions,users can choose the appropriate model according to their applications.

关键词： Piecewise function Vertical adjustment ZTD GNSS Tropospheric delay

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Mesoscale surface circulation and variability of Southern Indian Ocean derived by combining satellite altimetry and drifter observations

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Acta Oceanologica Sinica 2015年第9期34卷 12-22页

作者： BENNY N.Peter SHENBAKAVALLI Ranjan MAZLAN Hashim MOHD Nadzri Reba MOHD Razali Mahmud Department of Coastal and Offshore Engineering School of Ocean Engineering and Underwater TechnologyKerala University of Fisheries and Ocean Studies Department of Geomatic Engineering Faculty of Geoinformation and Real EstateUniversity of Technology Malaysia Institute of Geospatial science & technology Faculty of Geoinformation and Real EstateUniversity of Technology Malaysia

High resoultion Eulerian mean velocity field has been derived by combining the satellite tracked surface drifter data with satellite altimetry and ocean surface winds. The drifter data used in this study includes Argos and surface drifter data from Global Drifter Program. Maps of Sea Level Anomaly （MSLA） weekly files with a resolution of （1/3）° in both Latitude and Longitude for the period 1993-2012 have been used. The Ekman current is computed using ocean surface mean wind fields from scatterometers onboard ERS 1/2, Quikscat and ASCAT. The derived mean velocity field exhibits the broad flow of Antarctic Circumpolar Current with speeds up to 0.6 m/s. Anomalous field is quite significant in the western part between 20~ and 40~E and in the eastern part between 80~E and 100~E with velocity anomaly up to 0.3 m/s. The estimated mean flow pattern well agrees with the dynamic topography derived from in-situ observations. Also, the derived velocity field is consistent with the in-situ ADCP current measurements. Eddy kinetic energy illustrates an increasing trend during 1993-2008 and is in phase coherence with the Southern Annular Mode by three month lag. Periodic modulations are found in the eddy kinetic energy due the low frequency Antarctic Circumpolar Wave propagation.

关键词： Antarctic Ocean circulation satellite altimetry eddy kinetic energy Southern Indian Ocean antarctic circumpolar wave

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Studies on biodiversity and bioprospecting of active mud volcano associated bacteria and actinobacteria from Baratang,Andaman Islands,India

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Systems Microbiology and Biomanufacturing 2023年第2期3卷 339-357页

作者： Balakrishnan Meena Lawrance Anburajan Karankal Aryamol Nambali Valsalan Vinithkumar Gopal Dharani Atal centre for Ocean science and technology for Islands National Institute of Ocean TechnologyMinistry of Earth SciencesGovernment of IndiaDollygunjPort BlairAndaman and Nicobar Islands 744103India Marine Biotechnology Division Ocean Science and Technology for Islands GroupNational Institute of Ocean TechnologyMinistry of Earth SciencesGovernment of IndiaChennaiTamil Nadu 600100India Department of Marine Biology Kerala University of Fisheries and Ocean StudiesKochiKerala 682506India

A total of 79 bacteria and 101 actinobacteria strains were isolated from the sediment samples of the different points of Baratang mud volcano viz.,point of the eruption(M),middle of the volcano(MD),and the dried part of the mud volcano(E).Based on the biochemical and molecular characterization,the isolates were categorized under the phyla Proteobacteria,Firmicutes and Proteobacteria included representatives of Classes Alphaproteobacteria,Gammaproteobacteria and Deltaproteobacteria of 29 genera with 38 distinct ***-eight bacterial strains from four different regions of mud volcano revealed excellent activity for indole-3-acetic acid(IAA)*** antagonistic property,plant growth promoting properties such as IAA production,phosphate,potassium and zinc solubilization were identified in Bacillus megaterium NIOT_MV 31 strain of 38 studied *** this study,we investigated the optimization of IAA production by *** NIOT_MV 31 and its formulation as a plant growth promoter to improve economic and agricultural *** IAA yield was achieved using optimal conditions(42.63 mg/mL)in the presence of optimized tryptophan after 4 days of *** increase in the plant growth parameters were observed to that of control *** of culture conditions resulted in a fourfold increase in IAA production by *** NIOT_MV 31 *** results clearly demonstrated that,*** NIOT_MV 31 holds great potential as a source for IAA production and may be useful for commercial applications.

关键词： Mud volcano Plant growth promoter Indole-3-acetic acid Seed germination Bacillus megaterium

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Physico-mechanical characteristics of bast fibres of Sesamum indicum and Sesamum radiatum for bioprospecting

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Journal of Bioresources and Bioproducts 2022年第4期7卷 306-319页

作者： Ancy S Watson Suhara Beevy S Department of Botany University of KeralaThiruvananthapuram 695581KeralaIndia

Natural fibres are renewable,inexpensive and biodegradable sources of sustainable materials from plants or *** fibres,as the notable natural fibres,are gathered from the outer cell layers of the stem of *** and young bast fibres from two species of Sesamum,namely Sesamum indicum *** *** Schumach.&*** extracted through traditional water retting technique and analyzed for their physical,mechanical and chemical *** studies revealed polygon shaped phloem(bast fibre)cells with small lumen were similar to jute,in terms of architecture,and bagasse,in terms of lumen *** extraction and subsequent drying,the young stems of *** were found to yield more bast fibres by mass compared with the rest of the Sesamum samples,that was,0.59 g(dry weight)of bast fibres from 100 g(fresh weight)of *** to stereo microscopic images,the mature *** fibres had rougher edges than the *** *** and *** fibre surfaces also seemed to have pores,according to scanning electron microscopy(SEM)*** porosity appeared to get more pronounced as the plants got *** Sesamum bast fibres were also found to be extremely hydrophilic with a high-water retention *** fibres obtained from *** were determined to be suitable for the textile industry due to their light colour,ideal diameter and length,and water-holding capacity that matched the requirements of fabric *** in the absence of a mordant,the mature fibres showed a significant degree and evenness of Alizarin dye attachment,which might be correlated to the increase in fibre surface roughness with fibre *** fibres were also discovered to be comparable with jute in terms of phloem cell shape(polygonal),diameter(13-15 m),tenacity(12.86-32.54 gf/(g·km-1)),and linear density(2.5-3.3 g/km).It suggested that they might find industrial applications if further research were to be done.

关键词： Sesamum Bast fibre Textile Tensile strength Dyeing Sustainability

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