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Mass balance and morphological evolution of the Dokriani Glacier,central Himalaya,India during 1999–2014

Geoscience Frontiers 2022年第1期13卷 255-267页

作者： Purushottam Kumar Garg jairam singh yadav Santosh Kumar Rai Aparna Shukla Indian Institute of Technology Indore Khandwa RoadSimrolIndore 453552India Wadia Institute of Himalayan Geology 33GMS RoadDehradun 248001India Ministry of Earth Sciences Prithvi BhavanLodhi RoadNew Delhi 110003India

Glaciological mass balance(MB)is considered the most direct,undelayed and unfiltered response of the glaciers to climatic ***,it may inherit errors associated with stake underrepresentation,averaging over the entire glacier and human ***,proper validation of glaciological MB with geodetic MB is highly recommended by the World Glacier Monitoring Service(WGMS).The present study focuses on the Dokriani Glacier,central Himalaya which is one of the bench-mark glaciers in the region and has glaciological MB records from 1993 to 2013 with intermittent *** the present study,firstly the glaciological MB series is extended to 2014 i.e.,field-based MB for one more year is computed and,to compare with it,the geodetic MB is computed for the 1999–2014 period using high resolution Cartosat-1 digital elevation model(DEM)and SRTM ***,the study assesses the regional representation of the Dokriani Glacier in terms of MB and evaluates the influence of the MB regime on its morphological *** show that the average glaciological MB(-0.34±0.2 m water equivalent(w.e.)y-1)is more negative than the geodetic MB(-0.23±0.1 m w.e.y-1)for the 1999–2014 *** is likely because of the partial representation of glacier margins in the glaciological MB,where melting is strikingly low owing to thick debris cover(>30 cm).In contrast,geodetic MB considers all marginal pixels leading to a comparatively low MB.A comparative assessment shows that the MB of Dokriani Glacier is less negative(possibly due to its huge accumulation area)than most other glacier-specific and regional MBs,restricting it to be a representative glacier in the ***,continuous negative MB has brought a peculiar change in the epiglacial morphology in the lower tongue of the glacier as differential debris thickness-induced differential melting has turned the glacier surface into a concave *** concavity has led to development of a large(10–20 m deep)supraglacial ch

关键词： Glacier mass balance Debris cover Epiglacial morphology Supraglacial channel Dokriani Glacier Central Himalaya

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Radiating two-fluid universe coupled with rotation interacting with a scalar field

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Research in Astronomy and Astrophysics 2011年第3期11卷 271-285页

作者： Koijam Manihar singh Kangujam Priyokumar singh Thiyam jairam singh Department of Mathematics Sambalpur University Department of Mathematics Ideal Girls College Department of Mathematics Manipur University

The solution of three new interesting studies,a rotating anisotropic twofluid universe coupled with radiation and a scalar field,are studied here,where the anisotropic pressure is generated by the presence of two non-interacting perfect fluids which are in relative motion with respect to each *** this problem,special discussion is made of the physically interesting class of models in which one fluid is a perfect comoving radiative fluid which is taken to model the cosmic microwave background and the second a perfect non-comoving fluid which will model the observed material content of the *** the different aspects of these model universes,the role of the radiation and scalar fields in defining the physical and dynamical properties of these models is specifically *** of the rotational perturbations is also made,in the course of which the amount of anisotropy induced in the pressure distribution by a small deviation from the Friedmann metric is also investigated,and it is observed that such anisotropies could grow faster than the expansion of the universe. All the models obtained in this problem are found to be theoretically satisfactory and thereby substantiate the possibilities of the existence of such astrophysical objects in this universe.

关键词： cosmic microwave background—cosmology:miscellaneous—stars:formation

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Early-Universe and Evolution of the Present Universe: Exact Solution Models

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Journal of Modern Physics 2011年第8期2卷 817-825页

作者： Koijam Manihar singh Thiyam jairam singh Kangujam Priyokumar singh 不详

The evolution of the Robertson-Walker type universes consisting of radiating perfect fluid distribution coupled with zero-mass scalar field in which the gravitational parameter G varies with cosmic time t are studied. Unified descriptions of the early evolution of the universe consisting of different phases are investigated. The different properties of the cosmological solutions are discussed and the physical behaviour of the model universes during the radiation-dominated era and also during the big bang scenario are studied. Here we obtain models which are geometrically closed and are thereby ever expanding and evolve from rest from a non-singular hot origin with maximum (finite) energy density and temperature and a small minimum (non-zero) gravitational coupling G.

关键词： Evolution Early Universe Inflation Radiation-Dominated Era Big Bang Phase Transition Particle Creation Relativity

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