Neloy Khare

Neloy Khare

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85
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629
Citations
Citations since 2017
5 Research Items
269 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060

Publications

Publications (85)
Article
Full-text available
The spatial distribution of benthic foraminiferal morpho-groups has been documented from the Kongsfjorden-Krossfjorden, to assess its environmental significance. Benthic foraminiferal abundance increases from the inner-most fjord towards the mouth in Kongsfjorden. The calcareous forms dominate the benthic foraminiferal population in Kongsfjorden as...
Article
Major, trace and rare earth element (REE) concentrations in combination with textural and mineralogical analysis of sediments have been used to understand geochemical fractionation in the sediment due to weathering and subsequent transport in the Svalbard region. Surface sediments from different water depths and a short sediment core have been coll...
Article
Full-text available
The faunal (foraminiferal and diatom abundance) and sedimentological analysis was carried out on two cores collected from a coastal lake in the Vestfold Hills region of Antarctica. Out of a couple of cores collected from the same lake, the one closer to the marine inlet, contained abundant foraminifera and the diatoms were dominant in the second co...
Article
Q-mode and R-mode cluster analyses have been carried out on the census counts data of 68 genera and one 'other genera' of benthic foraminifera from 32 stations off Mangalore-Cochin sector, west coast of India, to study the ecological preferences, especially the effect of depth on external test morphology of benthic foraminifera. We report that bent...
Article
The study has been conducted for insoluble residue and Calcium Carbonate content in a 4.80 m long shallow water (at 22 m water depth) sediment core (at 22 m water depth) off Central West Coast of India to reconstruct palaeo monsoonal precipitation linked with river discharge. The down core profile of carbonate content shows that it is generally les...
Article
A total of 23 surface sediment samples collected from north-south stretch along the Indian Ocean have been examined for their planktonic foraminiferal faunas. Among the other planktonic foraminiferal faunas, Neogloboquadrina pachyderma was found substantially in all samples. Census data of N. pachyderma were obtained for different parameters (avera...
Article
Full-text available
18 surface sediment samples collected from a north-south transect along the Indian Ocean have been analyzed for planktonic Foraminifera content. Among the other planktonic foraminiferal faunas, Globigerina bulloides was present substantially in all samples. Census data of G. bulloides were measured for different parameters (average size, mean prolo...
Article
Full-text available
The strength of Southern Hemisphere westerlies, as well as the positions of the subtropical front (STF), Agulhas Current (AC) and Agulhas Return Current (ARC) control the hydrography of the southwestern Indian Ocean. Although equatorward migration of the STF and reduction in Agulhas leakage were reported during the last glacial period, the fate of...
Data
A 47 cm long sediment core collected from an inland lake of the Vestfold Hills, East Antarctica has been examined to reconstruct the palaeolacustrine environmental changes. The core shows dates at two core intervals of 18-19 cm and 28-29 cm as 5050±98 yrs BP and 5560±96 yrs BP, respectively. The core exhibits a good amount of diatom population thro...
Article
Full-text available
The position of sub-tropical front (STF), Agulhas Current (AC) and Agulhas Return Current (ARC) controls the hydrography of southwestern Indian Ocean. Although, equator-ward migration of STF and reduction in Agulhas leakage has been reported during the last glacial period, the fate of ARC during the last glacial-interglacial cycle is not clear. The...
Article
We represent Paleoenvironmetal condition of Vestfold Hills region, based on the relative abundance of a single diatom species Fragilariopsis curta, a dominating sea-ice taxon. Increase in relative abundance of F. curta in a core from Vestfold Hills representing Holocene climatic history before 3820 years BP and 5560 year BP indicates the prevalence...
Data
alaeoclimate To interpret palaeoclimatology of Vestfold Hills region, an inland lake sediment core of 47 cm length was studied with respect to its diatom population. A total of 13 diatom species was identified and used for the Q-mode cluster analysis. Cluster analysis delineates five major clusters, including two sub-clusters. These clusters and su...
Article
Schirmacher Oasis, East Antarctica hosts loose unconsolidated sediments that consist dominantly of sand-silt admixtures with minor clay. These sediments were collected from different glacial environments such as polar ice sheets, inland lakes, exposed bedrock, and coastal shelf areas. Two sediment fractions (coarse 0.25–0.125 mm and fine 0.125–0.06...
Article
Full-text available
Sediment samples have been collected from the Schirmacher Oasis and adjoining area in East Antarctica; these areas consist of polar ice, ice-free area, lakes and the coastal shelf area. The 37 samples have been analysed for their grain-size parameters and statistical relationships. The oasis is characterised by ongoing glacial processes, including...
Article
Proxy records of paleomonsoonal variations were obtained, utilizing foraminiferal tracers in two shallow water sediment cores collected from the inner shelf region off Karwar, central west coast of India. The preliminary results record the average signature of relatively better monsoonal precipitation at around 1400–1410, 1575–1590 and 1750 AD with...
Article
Nineteen surface sediment samples, collected onboard ORV Sagar Kanya during the 199C and 200th (the pilot expedition to Southern Ocean) cruises along a north-south transect between 1.92° S to 55.01° S latitude and 67.88° E and 44.89° E longitude, were studied for total planktonic foraminiferal assemblage, relative abundance and the oxygen isotopic...
Article
A total of 25 surface sediment samples, collected along a North-South transect (from 9.69° N to 55.01° S and from 80° E and 40° E) in the south western Indian Ocean, were used to study the coiling direction patterns in foraminifera planktonic species Neogloboquadrina pachyderma, Globigerinita glutinata and Globigerina bulloides. Comparison between...
Article
Full-text available
Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect between latitudes 9.69°N and 55.01°S, and longitudes 80°E and 40°E were studied for isotopic variations (values of δ18O and δ13C) of the indicator planktonic species Globigerina bulloides. The results indicate t...
Article
During Silver Jubilee Indian Scientific Expedition to Antarctica (2005-2006) a pilot project was launched for continuous bathymetric profiling survey in Priyadarshini water body, using geophysical equipment 'HydroBox'. A total of 1800 line meter area was surveyed and continuous profiles of depth data in digital and analogue forms were recorded. The...
Article
The variations in the concentration of 10Be in the core (SK 200/23) from south western Indian Ocean apparently illuminate past levels of 10Be. The level in the core where lower concentration of 10Be (1.01 × 109 atoms/g) is encountered during the Late Holocene is not at tandem with the Late Holocene southern hemisphere temperature variation. The res...
Article
In order to monitor the impact of global warming phenomena over the Polar Regions, it is necessary to monitor snow/ice melt on the Greenland and the Antarctic ice sheets. Using MSMR data, it is possible to differentiate sea ice at different concentration levels. On the basis of microwave emissivities of continental ice and sea ice, useful informati...
Article
Solar activities are directly or indirectly responsible for climate variability around the globe. Evidences of such correspondences between solar activities and palaeoclimatic proxy data have been reported from polar as well as tropical regions, suggesting solar influence over climate dynamics. However, these findings need to be further strengthene...
Article
Full-text available
A total of 16 glacial sediments consisting of loose admixture of sand, silt and clay have been collected from different parts of the Schirmacher Oasis and adjoining areas, viz. main rocky land, inland lakes, ice sheet and coastal area. The clay from the sediments has been separated and studied for mineral identification using different thermal anal...
Article
Full-text available
The water depth at which the planktic foraminiferal species Globigerina bulloides calcifies its shell has been deciphered based on the oxygen isotopic composition of its shells in surface sediment samples collected from the southwestern Indian Ocean. The seawater temperature for water depths ranging from 0–200 m was estimated from G. bulloides δ18O...
Article
A total of 25 surface sediment samples collected along a North-South transect (from 9.69°N to 80°E and 55.01°S to 40°E) in south western Indian Ocean have been used to study recent planktic foraminifera revealing the ecological preferences of the planktic foraminifer species in the area, particularly the coiling direction patterns in the planktic s...
Article
Full-text available
Heavy minerals of twenty sediment samples, belonging to polar ice sheet, lake, mainland area and shelf region of Schirmacher Oasis, east Antarctica, have been studied for their textural characteristics, abundance and provenance determination. The heavy crop is represented by zircon, tourmaline, rutile, garnet, hypersthene, hornblende, chlorite, ens...
Article
Beneath the frozen compressed ice in Antarctica, scientists have discovered more than 100 of lakes, which became prime locations for scientific studies. Different aspects of scientific research in those lakes improve the understanding of the interaction of climate, geology, evolution of Antarctica with global scenario. The geochemical changes in la...
Article
Along a north-south transect (9.69 degrees N to 55.01 degrees S) in the southwestern Indian Ocean during the Indian Pilot Expedition to Southern Ocean (PESO), the oxygen isotopic analysis of planktic foraminifera (Globigerina bulloides) from 23 surface sediment samples was carried out to assess the relationship between isotopic composition of G. bu...
Article
Full-text available
Granulometric analysis of nineteen sediment samples has been carried out for their statistical and textural parameters. The samples are collected from the northern and southern margins of Schirmacher Oasis extending below the polar ice sheet and grading to coastal area respectively and main rocky land of Schirmacher including lakes. The analysis sh...
Article
An ice free Arctic can effect tropical climate and is therefore a key variable to understand the climate change. In order to undertake studies in the Arctic region, on 1st July 2008, the Indian station 'Himadri' has been opened in Ny-Ǻlesund. With India, 15 stations from 10 countries are now established in Ny-Ǻlesund. This report highlights Indian...
Article
Full-text available
Morphological variations with respect to the number of chambers in Neogloboquadrina pachyderma (Ehrenberg) were investigated in 25 surficial sediments of Indian Ocean taken along the N-S transect between 9.69° N and 55.01° S latitude and 80° E and 40° E longitude. The number of chamber was counted for at least 40 specimens picked for each sample. T...
Article
A total of 25 surficial sediment samples (Peterson grab, gravity and piston cores), collected during the Pilot Expedition to Southern Ocean (PESO) 2004 cruises 199C and 200 onboard the ORV Sagar Kanya along a N–S transect between 9.69 °N and 55.01 °S, and 80 and 40 °E in the Indian Ocean sector of the Southern Ocean (SW Indian Ocean), have been inv...
Article
Full-text available
The foraminiferal and microbenthos studies were carried out on samples collected from onshore soils/sediments from cultivated fields. The presence of exclusive marine organisms namely foraminifera in the soil of cultivated fields at distant onshore regions near New Wandoor (Andaman and Nicobar) suggested the areal extent of marine transgression due...
Article
Full-text available
The bathymetric survey of the Priyadarshini water body has been carried out using hydrobox and global positioning system. Three-dimensional bathymetric map has been prepared for the said water body. The instrumental bathymetric survey, in general matches with the earlier manually generated bathymetric data available for the water body. It provides...
Article
Full-text available
Siliceous spicules of endoskeletal dinoflagellates constitute a very small fraction of siliceous microfossil assemblage from Southern Ocean. They are represented by a solitary genus Actiniscus with its type species A. pentasterias. They are bilaterally symmetrical. It is useful in deriving palaeoecological interpretations. Their association with ag...
Article
The present study consists of a review of the climatic evolution of the Antarctic and Southern Ocean realms since the first massive ice sheet build-up in Antarctica during the Cenozoic. It elucidates the strong link between the cryosphere, oceans and atmosphere. The above aspects are built on a wealth of proxy data from different archives and from...
Article
Full-text available
Antarctic sediments dating from 30 million to 145 million years ago (a time during which the vast Antarctic ice sheet is thought to have formed and the Transantarctic mountains pushed up) have been a valuable source of information about the forces that changed the climatic conditions of the Antarctic continent. Additionally ice cores collected from...
Article
Full-text available
Seawater samples from the surface as well as at different depths of the water column were collected from 30 stations during the Pilot Expedition to Southern Ocean (PESO). The sampling stations were along a transect between latitude 27 degrees 59 minutes 48” S and 56 degrees 00 minutes 14" S and longitude 50 degrees E and 45 minutes E in the Indian...
Article
A 2-m-long, shallow-water sediment core, representing the last 2,500years, collected from the tropical Arabian Sea from the inner shelf (22m water depth) off Karwar, near the mouth of the Kali River, has been studied for sedimentological proxies (granulometry) and foraminiferal tracers of paleomonsoons. The results suggest a considerable decrease i...
Article
Full-text available
Relationships between the Antarctic sea ice variability and extrapolar climate variables especially the Indian Ocean SST have been explored and we have identified that the southeast Indian Ocean SST shows the most persistence relationship with Antarctic sea ice variability. The SST is the unique precursor for the Australian summer monsoon, Indian s...
Article
Full-text available
Modern sea-water temperature has been estimated using oxygen isotopic composition of planktic foraminiferal species, Globigerina bulloides recovered from the surface sediments collected from southwestern Indian Ocean (IO). The sea-water temperature estimated from δ18Ο G. bulloides has been compared with that measured on-board. Though a nearly const...
Article
Full-text available
The δ18O variation in planktic foraminifera Globigerina bulloides from nineteen surface sediment samples, collected onboard ORV Sagar Kanya between 1.92°S and 55.01°S latitude in the Indian Ocean sector of Southern Ocean, have been analyzed to understand the relationship between oxygen isotopic fractionation and near surface seawater salinity. The...
Article
The literature published on foraminiferal investigations carried out till date on nearshore, shallow water regions up to a depth of 50 m, along western coast of India, including Laccadive Archipelago has been reviewed. The aim is to prepare a bibliography of the foraminiferal studies from the tropical Arabian Sea bordering west coast of India and t...
Article
Foraminiferal studies carried out on beaches, mudflats, estuaries and in nearshore shallow water regions along eastern coast line of India up to 50 m water depth, including Andaman and Nicobar Islands, have been reviewed. The review suggests that as far as beaches, mudflats and estuaries of east coasts are concerned, a total of 34 papers have been...
Article
Full-text available
The planktic foraminiferal abundance has been calculated in a set of 28 surface sediment samples collected from the equatorial and southwestern Indian Ocean. In order to understand the influence of changing seawater pH on the planktic foraminiferal abundance, the latter has been compared with average sea-water pH of the top 500 m of the water colum...
Article
The present study is based on the data (total planktonic foraminifera and their respective broken shells counts in one gram dry sediments) generated on the twenty five surface sediment samples collected onboard OBV Sagar Kanya during the 199C and 200th (also known as Pilot expedition to Southern Ocean) cruises along a North - South transect between...
Article
Twenty five surface sediment samples (comprising Peterson Grab, Piston, Gravity and Spade core top samples) were collected along a north-south transect (between 9.69° N and 55.01° S latitude and 80° E and 40° E longitude). On the basis of overall size, the total planktonic population has been divided into two groups (> 120 μm sized population and <...
Article
Full-text available
Foraminiferal studies on a shallow water sediment core off Karwar, central west coast of India have revealed significant changes in the monsoonal precipitation during the last around 720 years. The results hint towards some possibility of linkage of monsoonal precipitation with solar variability during this period.
Article
The Indian pilot expedition to Southern Ocean was launched by the National Centre for Antarctic and Ocean Research, Goa in January 2004. During this expedition a number of studies/experiments such as atmospheric observations, physical oceanographic observations, biological studies and chemical oceanographic observations were undertaken. In addition...
Article
Antarctica is well known for its valuable reserves and various ongoing important scientific activities At one side where the Antarctic environment governs the southern hemisphere s weather pattern other side it is considered as datum for environmental pollution comparison. In Antarctica various places are very important due to its scientific activi...
Article
Polar sea ice has been monitored quasi-continuously over the last 30 years using passive microwave radiometers onboard three satellites in polar orbit, namely Nimbus-5, Nimbus-7 and Defense Meteorological Satellite Program (DMSP) series. A short overlap between Scanning Multichannel Microwave Radiometer (SMMR) on Nimbus-7 and Special Sensor Microwa...
Article
Full-text available
Space-based passive microwave radiometers have been used to monitor southern ocean sea ice characteristics over the Antarctic region for the last 25 years. Decade-long observations from SMMR onboard Nimbus-7 during 1978-1987 indicated significant long-term trends in sea ice cover over different regions of the southern polar ocean, in addition to th...
Article
Encircling the Antarctic, Southern Ocean connects all the three oceans of the world with fastest current system found anywhere in the world. The region is thermally very stable and is covered with ice, which has a strong seasonal variability. The sea ice pulsates annually with seasonal migration varying from 4 million square kilometer to 20 million...
Article
This paper highlights preliminary results from the analysis of the first year's data from the multi-channel scanning microwave radiometer (MSMR) onboard India's Oceansat-1 satellite, over the climatologically and geologically important Antarctic and Southern Ocean regions. Weekly averaged microwave brightness temperature images formed using the MSM...
Article
Full-text available
This paper discusses the features observed over the Antarctic in the passive microwave emission region by the multi-frequency scanning microwave radiometer (MSMR) instrument on-board the Indian remote sensing satellite IRS-P4, now called OCEANSAT-1. Brightness temperature images produced from MSMR show a clear distinction between open water and sea...
Conference Paper
The data from OCEANSAT-1 MSMR in the passive microwave region have been analyzed to estimate the ice surface emissivities (ε) over Antarctica. The Indian Station Maitri (70°45' S, 11°45' E) was chosen for the first case study. The brightness temperatures (T<sub>b </sub>) were retrieved over Maitri from the satellite data at 18 and 21 GHz for both t...
Article
Full-text available
Sensitivity of foraminifera towards environmental / climatic changes, makes them a distinct proxy of paleoclimatic conditions. In order to use these micro organisms for paleoclimatic reconstruction, their response in the modern marine environment and in culture under laboratory condition, needs to be well studied. Accordingly, recently a laboratory...
Article
Full-text available
During the 4th and 6th Indian Expedition to Antarctica, surface sediment samples were collected from eight stations in the Queen Maud Land Shelf, Lazarev Sea from the depth ranging from 157 to 785 m. The mean biomass of these samples is 3057 + or -209.70 g m-². Out of the total biomass a specific micro-organism namely foraminifera has been the focu...
Article
From the shallow region off the central west coast of India, 21 samples of surface sediments (ranging in depth from 22 to 52 m) along with two sediment cores of 4.80 m and 4.00 m (surface/subsurface) have been analyzed for foraminiferal composition and diversity. A total of 177 species have been identified and illustrated by scanning electron photo...
Article
Studies on Recent foraminifera from inner shelf sediments of the Bay of Bengal, off Karikkattukuppam, near Chennai (latitude 13°04' N; longitude 80°17' E), revealed the presence of a rare foraminiferal species. Taxonomic observations reveal this spinose taxon to be Glandulina spinata Cushman and is reported herein for the first time from Indian wat...
Article
Full-text available
A laboratory culture programme is established to extend credibility to foraminiferal-based techniques being used to generate the high-resolution proxy records for palaeoclimatic reconstruction. In order to obtain living specimen of foraminiferal species for laboratory culture experiments, a number of samples were analyzed from the nearshore region...
Article
Variations in the mean proloculus size (MPS) of the benthic foraminiferal speciesRotalidium annectens were studied in a core collected off Karwar (20 m water depth), on the west coast of India. Comparison of downcore variations in the MPS with rainfall (five-year average) over a period of 100 years from the catchment area of the Kali River shows a...
Article
A 1.15 m long core collected from 20 m water depth off Karwar on the western continental shelf of India was studied to reconstruct the paleomonsoonal, precipitational history during the recent past with fine time resolution by exploiting foraminifera as proxy. These established parameters (indicating salinity fluctuations, thus runoff from rivers d...
Article
Full-text available
The foraminiferal population in 45 surface sediment samples (20-86 m water depth) off Mangalore, Karnataka, India, was divided into benthic and planktonic assemblages. Within the benthic community based on the external test morphology, the population was further placed into two broad morpho-groups namely, angular-asymmetrical and rounded-symmetrica...
Article
A 4.80 m long shallow water sediment core, collected from the inner shelf (at 22 m water depth) off Karwar, near Kali river mouth is studied for foraminiferal tracers of palaeomonsoons. The climatic history of this core which represents the last 4500 years approximately (14C dates) revealed the evidences of a significant change in the intensity of...
Article
Twenty one surface sediment samples collected from the inner shelf region off Karwar at 22-52 m water depth range have been studied for foraminiferal content. Based on the external test morphology the entire foraminiferal population (148 species) can be placed into two broad morpho-groups, namely angular-asymmetrical and rounded-symmetrical morpho-...
Article
There are various opinions as to what parameter influences the coiling directions in foraminifera. "Do microspheric and megalospheric generations have different coiling ratios?" is an unanswered question in foraminiferal studies. Per view of this, an attempt is made to study the relationship between mode of reproduction (sexual/asexual) and coiling...
Article
A technique is proposed for the quick and easy assessment of paleomonsoonal precipitation through the study of morphological groups of foraminifera in a shallow water (20 m water depth) sediment core collected off Karwar, near Kali river mouth, central west coast of India. The percentage distribution of two morpho-groups (i.e. rounded-symmetrical a...
Article
A case of abnormal two apertured Bulimina species was encountered in a sea bottom sample from 24 metre water depth off Karwar. This abnormality seems to be a case of regeneration/repair
Article
Bilogical composition and biodiversity alongwith microbial study became very upcoming subjects in present science. In recent time the lakes of Antarctica are the main area for biological studies. To understand the ecology and climate, and hence the evolution of Antarctica, different aspects of biological studies have been carried out in Antarctic L...
Article
Full-text available
Planktic foraminifera species Globigerinita glutinata (Egger, 1895) was analyzed from 22 surface sediment samples from 9.69° N to 55.01° S north-south stretch along the Indian Ocean. Different morphological parameters; viz. average size, mean proloculus size, number of chamber and coiling direction of G. glutinata were measured and this data were a...
Article
Full-text available
The foraminiferal content of one hundred eight modern marine sediment samples off Vengurla-Cochin sector (ranging in water depth from 30 to 1330 m). West Coast of India was studied. A total of two hundred four foraminiferal species (comprised of one hundred eighty benthic and twenty-four planktonic species) were recorded. Based on the external morp...
Article
Full-text available
A total of seven surface sediment samples collected within 4.4 m to 13.9 m water depth (below chart datum) from Kharo Creek were studied for their foraminiferal content. The study reveals forty seven foraminiferal species of which forty four are benthic and three are planktic. It is observed that distribution of foraminifera is mainly controlled by...
Article
Full-text available
In recent past much emphasis has been laid on the high resolution reconstruction of the paleoclimatic conditions to help in preparing the futuristic climatic model. Many such efforts have used foraminifera as proxy indicators of the climate. No doubt these proxies were well tested in the modern environmental setup, prior to be considered as climate...
Article
Full-text available
An immense quantum of work on foraminifera is being carried out in Indian waters by various research centers and universities. However, a thorough review of the foraminiferal studies from Indian waters is yet to be amde. A critical review will also helf to check repetition of the work and to guide workers to decide the thrust areas and take up mult...
Article
Full-text available
Based on the artifacts, a number of climatic changes in the past are documented in archaeological investigations which are reported to have been the causes for the rise and fall of human civilizations. The credibility of such studies increases, if supportEd. by parallel climatic records preserved in the sea. Nevertheless, the oceans have been a mys...

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OBJECTIVES • To understand the high resolution variability of monsoon from north-eastern Arabian Sea off Saurashtra by using foraminifera and their isotopic and other geochemical aspects. • To study the past productivity changes of north-eastern Arabian Sea and compare these changes with the past productivity records of the northern Indian Ocean. • To understand the abrupt climatic variations and their relation with global climate and their possible cyclicity (if any).