Rajveer Sharma
Datos Biográficos
| ID | 4131670 |
|---|---|
| NOMBRE | Rajveer Sharma |
| NOMBRES | Rajveer |
| APELLIDO | Sharma |
| FIRMA | SHARMA R |
| AFILIACIONES | Inter-University Accelerator Centre |
| ORCID | 0000-0003-0454-4753 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 22 |
| TOTAL DE CITAS | 17 |
| TOTAL COMO AUTOR | 22 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 2019 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2026 |
| ÍNDICE H | 2 |
AMS Radiocarbon Dating of Neolithic Sites in the Kashmir Valley, India
This study presents accelerator mass spectrometry (AMS) radiocarbon dates from three endangered Neolithic sites in the Kashmir Valley—Gufkral (Extension), Hariparigam and Qasim Bagh. As these sites are threatened by ongoing anthropogenic activities and are not suitable for large‐scale excavation, samples were collected from exposed stratigraphic sections using a minimally invasive approach. Twenty samples, including charcoal, bone, ash and charre…
Radiocarbon based fossil fuel CO 2 observations in megacity Delhi
This study employs radiocarbon measurements (Δ 14 C) to detect fossil fuel CO 2 (CO 2ff ) in the megacity Delhi from 2018 to 2022, offering unique insights into fossil fuel emissions. Our measurements reveal varying Δ 14 C values ranging from −56.2‰ to 7.5‰ and CO 2ff values ranging from 0.3 ppm to 25.2 ppm. We observed a distinct seasonality in Δ 14 C and CO 2ff , with higher CO 2ff (lower Δ 14 C) values during winter and post-monsoon seasons an…
Indian summer monsoon variability and climate-driven weathering since ∼25 ka
Holocene sea–level changes and fluvial controls on the geomorphic evolution of the Thalassery river mouth, southwest Kerala coast, India
Late Quaternary evolution of piedmont faults in the Darjeeling-Sikkim Himalaya, India
Quantification of excess carbon-14 specific activity in soil and sediments in the vicinity of a nuclear power plant by batch combustion and liquid scintillation counting method
The application of a tube combustion system (pyrolyzer) for the batch combustion of low carbon content environmental matrices, such as soil and sediment, for determining 14 C specific activity is examined. The samples were combusted at 600°C, and the CO 2 species produced were trapped in 3N NaOH, precipitated as BaCO 3 by adding BaCl 2 , and subjected to acid-hydrolysis to transfer the CO 2 species to the absorber-scintillator mixture for liquid …
Paleorainfall during the past two millennia in the Western Ghats, south-western India
Increasing frequency of extreme climatic events in southern India during the Late Holocene
In this study, we aim to reconstruct southern India's intrinsic environmental changes over the past 1500 years from 3330 to 1830 cal BP by investigating the sedimentation and weathering dynamics in Lake Shantisagara, one of Karnataka's largest lakes. Four distinct climatic phases were delineated based on sedimentological, geochemical, and End Member Modelling Analysis (EMMA) results. Phase 1 (3330-3100 cal BP) is a short-term low rainfall zone ch…
Holocene paleoclimatic records from Chakrata area, Northwest Himalaya
Palaeoclimatic shifts in the Central Ganga Basin during the Middle- to Late Holocene
The Central Ganga Basin is one of the most densely populated regions of India. It is agriculturally diverse and contributes much to the Indian economy. The region has housed numerous ancient and mediaeval empires. This study presents a continuous record of the paleomonsoon from the Chandrika Devi lake, Lucknow district of Uttar Pradesh, India which is linked with paleo vegetational shifts over the last ~6000 years (5871–75 cal yr BP). The chronol…
AMS 14 C Dating of the Sites of Digaru-Kolong River Valley, Assam-Meghalaya Foothills, India
The present study aims to determine the chronology of the past settlement of the different archaeological sites of the Digaru–Kolong River valley (Assam-Meghalaya Foothills), India, based on accelerator mass spectrometry (AMS) 14 C dates of seven charcoal samples, five potsherds, and five sediment samples. The archaeological record of the study area consists of ground and polished stone axes and adzes, pottery, and standing or buried megaliths. T…
Spatial Distribution of Fossil Fuel Co 2 in Megacity Delhi Determined Using Radiocarbon Measurements in Peepal ( Ficus Religiosa ) Tree Leaves
The quantification of fossil-fuel derived carbon dioxide (CO 2ff ) emissions is critical for regional carbon budgets. Radiocarbon ( 14 C) is an effective tool to estimate the contribution of CO 2ff to the total atmospheric CO 2 . In the present study, we have determined the spatial distribution of fossil fuel derived CO 2 across Delhi using 14 C measurements in Peepal tree leaves from April 2016 to March 2017 at city scale. Our analysis results s…
Deciphering the source contribution of organic matter accumulation in an urban wetland ecosystem
A better understanding of the organic matter (OM) dynamics is a key to successful wetland management. We established the radiocarbon chronology ( 14 C) and vertical distribution of nitrogen (N), phosphorus (P), OM, and carbon to nitrogen ratio (C/N) in the sediment core retrieved from the Anchar Wetland, Kashmir Himalaya. The accelerator mass spectrometer (AMS) assisted 14 C dating of the sediment core showed 14 C age reversals related to occasio…
Chronology of Fossiliferous Localities in Manjra Valley, District Latur, Maharashtra, India
The present paper is an announcement of first absolute age dating directly on fossilized bones and teeth of the Pleistocene mammalian fauna from the Manjra valley, District Latur, Maharashtra, India. The fossilized samples were measured using the AMS facility at Inter-University Accelerator Centre, New Delhi, India. The results gave the time frame of 21,423 BP to 24,335 BP that correspond close to and the threshold of LGM and sheds important ligh…
Neolithic cultural sites and extreme climate related channel avulsion
Saraswati River in northern India (Haryana) and its role in populating the Harappan civilization sites—A study based on remote sensing, sedimentology, and strata chronology
The Saraswati River used to flow from the glaciated peaks of the Himalaya to the Arabian sea, covering a distance of about 1800 km. It possibly sustained the Harappan civilization in the Indian subcontinent. This river has been studied as a part of the Ghaggar–Satluj–Hakra–Nara channel system in India and Pakistan. This study investigated its independent existence and evolution in the Himalayan foothill terrain and the proximal alluvial plains. U…
New Ams 14 C Dates of a Multicultural Archaeological Site From the Paleo-Deltaic Region of West Bengal, India
This study is on the absolute age dating of a multicultural site of Erenda, East Medinipur district, in coastal West Bengal, India. Charcoal samples were collected and measured using the accelerator mass spectrometry (AMS) facility at the Inter-University Accelerator Centre, New Delhi, India. These samples were collected from secured stratigraphic context of two excavated trenches. A careful collection of samples from two trenches provided us wit…
Inter-University Accelerator Centre, New Delhi (Iuacd) Radiocarbon Date List Ii
Accelerator mass spectrometry (AMS) activities at the Inter-University Accelerator Centre (IUAC) in New Delhi, India, started with its 15UD Pelletron accelerator and cosmogenic radionuclide (CRN) measurements of 10 Be and 26 Al. Realizing the demand of a radiocarbon ( 14 C) AMS facility in India, a 500kV Pelletron accelerator based AMS system was installed in 2015. This facility was designated with the lab code IUACD for 14 C measurements. 14 C d…
Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas
We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. …
Inter-University Accelerator Centre, New Delhi (Iuacd) Radiocarbon Date List I
A new facility for radiocarbon dating by accelerator mass spectrometry (AMS) was established in early 2015 at the Inter-University Accelerator Centre in New Delhi, India. The facility uses a 500 kV National Electrostatic Corporation (NEC) Pelletron accelerator for AMS measurements on graphite produced using the automated graphitization equipment (AGE) interfaced with an elemental analyzer and the carbonate handling system (CHS). A precision of be…
Monsoon variability and major climatic events between 25 and 0.05 ka BP using sedimentary parameters in the Gangotri Glacier region, Garhwal Himalaya, India
Paleoenvironmental shifts spanning the last ~6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake
Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by 14 C AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000–4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual str…
Paleoenvironmental shifts spanning the last ~6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake
Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by 14 C AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000–4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual str…
Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas
We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. …
Palaeoclimatic shifts in the Central Ganga Basin during the Middle- to Late Holocene
The Central Ganga Basin is one of the most densely populated regions of India. It is agriculturally diverse and contributes much to the Indian economy. The region has housed numerous ancient and mediaeval empires. This study presents a continuous record of the paleomonsoon from the Chandrika Devi lake, Lucknow district of Uttar Pradesh, India which is linked with paleo vegetational shifts over the last ~6000 years (5871–75 cal yr BP). The chronol…
Inter-University Accelerator Centre, New Delhi (Iuacd) Radiocarbon Date List I
A new facility for radiocarbon dating by accelerator mass spectrometry (AMS) was established in early 2015 at the Inter-University Accelerator Centre in New Delhi, India. The facility uses a 500 kV National Electrostatic Corporation (NEC) Pelletron accelerator for AMS measurements on graphite produced using the automated graphitization equipment (AGE) interfaced with an elemental analyzer and the carbonate handling system (CHS). A precision of be…
Chronology of Fossiliferous Localities in Manjra Valley, District Latur, Maharashtra, India
The present paper is an announcement of first absolute age dating directly on fossilized bones and teeth of the Pleistocene mammalian fauna from the Manjra valley, District Latur, Maharashtra, India. The fossilized samples were measured using the AMS facility at Inter-University Accelerator Centre, New Delhi, India. The results gave the time frame of 21,423 BP to 24,335 BP that correspond close to and the threshold of LGM and sheds important ligh…
Neolithic cultural sites and extreme climate related channel avulsion
Saraswati River in northern India (Haryana) and its role in populating the Harappan civilization sites—A study based on remote sensing, sedimentology, and strata chronology
The Saraswati River used to flow from the glaciated peaks of the Himalaya to the Arabian sea, covering a distance of about 1800 km. It possibly sustained the Harappan civilization in the Indian subcontinent. This river has been studied as a part of the Ghaggar–Satluj–Hakra–Nara channel system in India and Pakistan. This study investigated its independent existence and evolution in the Himalayan foothill terrain and the proximal alluvial plains. U…
Inter-University Accelerator Centre, New Delhi (Iuacd) Radiocarbon Date List Ii
Accelerator mass spectrometry (AMS) activities at the Inter-University Accelerator Centre (IUAC) in New Delhi, India, started with its 15UD Pelletron accelerator and cosmogenic radionuclide (CRN) measurements of 10 Be and 26 Al. Realizing the demand of a radiocarbon ( 14 C) AMS facility in India, a 500kV Pelletron accelerator based AMS system was installed in 2015. This facility was designated with the lab code IUACD for 14 C measurements. 14 C d…
Monsoon variability and major climatic events between 25 and 0.05 ka BP using sedimentary parameters in the Gangotri Glacier region, Garhwal Himalaya, India
Paleoenvironmental shifts spanning the last ~6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake
Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by 14 C AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000–4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual str…
Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas
We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. …
Inter-University Accelerator Centre, New Delhi (Iuacd) Radiocarbon Date List I
A new facility for radiocarbon dating by accelerator mass spectrometry (AMS) was established in early 2015 at the Inter-University Accelerator Centre in New Delhi, India. The facility uses a 500 kV National Electrostatic Corporation (NEC) Pelletron accelerator for AMS measurements on graphite produced using the automated graphitization equipment (AGE) interfaced with an elemental analyzer and the carbonate handling system (CHS). A precision of be…
Neolithic cultural sites and extreme climate related channel avulsion
Saraswati River in northern India (Haryana) and its role in populating the Harappan civilization sites—A study based on remote sensing, sedimentology, and strata chronology
The Saraswati River used to flow from the glaciated peaks of the Himalaya to the Arabian sea, covering a distance of about 1800 km. It possibly sustained the Harappan civilization in the Indian subcontinent. This river has been studied as a part of the Ghaggar–Satluj–Hakra–Nara channel system in India and Pakistan. This study investigated its independent existence and evolution in the Himalayan foothill terrain and the proximal alluvial plains. U…
New Ams 14 C Dates of a Multicultural Archaeological Site From the Paleo-Deltaic Region of West Bengal, India
This study is on the absolute age dating of a multicultural site of Erenda, East Medinipur district, in coastal West Bengal, India. Charcoal samples were collected and measured using the accelerator mass spectrometry (AMS) facility at the Inter-University Accelerator Centre, New Delhi, India. These samples were collected from secured stratigraphic context of two excavated trenches. A careful collection of samples from two trenches provided us wit…
Inter-University Accelerator Centre, New Delhi (Iuacd) Radiocarbon Date List Ii
Accelerator mass spectrometry (AMS) activities at the Inter-University Accelerator Centre (IUAC) in New Delhi, India, started with its 15UD Pelletron accelerator and cosmogenic radionuclide (CRN) measurements of 10 Be and 26 Al. Realizing the demand of a radiocarbon ( 14 C) AMS facility in India, a 500kV Pelletron accelerator based AMS system was installed in 2015. This facility was designated with the lab code IUACD for 14 C measurements. 14 C d…
Deciphering the source contribution of organic matter accumulation in an urban wetland ecosystem
A better understanding of the organic matter (OM) dynamics is a key to successful wetland management. We established the radiocarbon chronology ( 14 C) and vertical distribution of nitrogen (N), phosphorus (P), OM, and carbon to nitrogen ratio (C/N) in the sediment core retrieved from the Anchar Wetland, Kashmir Himalaya. The accelerator mass spectrometer (AMS) assisted 14 C dating of the sediment core showed 14 C age reversals related to occasio…
Chronology of Fossiliferous Localities in Manjra Valley, District Latur, Maharashtra, India
The present paper is an announcement of first absolute age dating directly on fossilized bones and teeth of the Pleistocene mammalian fauna from the Manjra valley, District Latur, Maharashtra, India. The fossilized samples were measured using the AMS facility at Inter-University Accelerator Centre, New Delhi, India. The results gave the time frame of 21,423 BP to 24,335 BP that correspond close to and the threshold of LGM and sheds important ligh…
Spatial Distribution of Fossil Fuel Co 2 in Megacity Delhi Determined Using Radiocarbon Measurements in Peepal ( Ficus Religiosa ) Tree Leaves
The quantification of fossil-fuel derived carbon dioxide (CO 2ff ) emissions is critical for regional carbon budgets. Radiocarbon ( 14 C) is an effective tool to estimate the contribution of CO 2ff to the total atmospheric CO 2 . In the present study, we have determined the spatial distribution of fossil fuel derived CO 2 across Delhi using 14 C measurements in Peepal tree leaves from April 2016 to March 2017 at city scale. Our analysis results s…
Increasing frequency of extreme climatic events in southern India during the Late Holocene
In this study, we aim to reconstruct southern India's intrinsic environmental changes over the past 1500 years from 3330 to 1830 cal BP by investigating the sedimentation and weathering dynamics in Lake Shantisagara, one of Karnataka's largest lakes. Four distinct climatic phases were delineated based on sedimentological, geochemical, and End Member Modelling Analysis (EMMA) results. Phase 1 (3330-3100 cal BP) is a short-term low rainfall zone ch…
Holocene paleoclimatic records from Chakrata area, Northwest Himalaya
Palaeoclimatic shifts in the Central Ganga Basin during the Middle- to Late Holocene
The Central Ganga Basin is one of the most densely populated regions of India. It is agriculturally diverse and contributes much to the Indian economy. The region has housed numerous ancient and mediaeval empires. This study presents a continuous record of the paleomonsoon from the Chandrika Devi lake, Lucknow district of Uttar Pradesh, India which is linked with paleo vegetational shifts over the last ~6000 years (5871–75 cal yr BP). The chronol…
AMS 14 C Dating of the Sites of Digaru-Kolong River Valley, Assam-Meghalaya Foothills, India
The present study aims to determine the chronology of the past settlement of the different archaeological sites of the Digaru–Kolong River valley (Assam-Meghalaya Foothills), India, based on accelerator mass spectrometry (AMS) 14 C dates of seven charcoal samples, five potsherds, and five sediment samples. The archaeological record of the study area consists of ground and polished stone axes and adzes, pottery, and standing or buried megaliths. T…
Quantification of excess carbon-14 specific activity in soil and sediments in the vicinity of a nuclear power plant by batch combustion and liquid scintillation counting method
The application of a tube combustion system (pyrolyzer) for the batch combustion of low carbon content environmental matrices, such as soil and sediment, for determining 14 C specific activity is examined. The samples were combusted at 600°C, and the CO 2 species produced were trapped in 3N NaOH, precipitated as BaCO 3 by adding BaCl 2 , and subjected to acid-hydrolysis to transfer the CO 2 species to the absorber-scintillator mixture for liquid …
Paleorainfall during the past two millennia in the Western Ghats, south-western India
AMS Radiocarbon Dating of Neolithic Sites in the Kashmir Valley, India
This study presents accelerator mass spectrometry (AMS) radiocarbon dates from three endangered Neolithic sites in the Kashmir Valley—Gufkral (Extension), Hariparigam and Qasim Bagh. As these sites are threatened by ongoing anthropogenic activities and are not suitable for large‐scale excavation, samples were collected from exposed stratigraphic sections using a minimally invasive approach. Twenty samples, including charcoal, bone, ash and charre…
Radiocarbon based fossil fuel CO 2 observations in megacity Delhi
This study employs radiocarbon measurements (Δ 14 C) to detect fossil fuel CO 2 (CO 2ff ) in the megacity Delhi from 2018 to 2022, offering unique insights into fossil fuel emissions. Our measurements reveal varying Δ 14 C values ranging from −56.2‰ to 7.5‰ and CO 2ff values ranging from 0.3 ppm to 25.2 ppm. We observed a distinct seasonality in Δ 14 C and CO 2ff , with higher CO 2ff (lower Δ 14 C) values during winter and post-monsoon seasons an…
Indian summer monsoon variability and climate-driven weathering since ∼25 ka
Holocene sea–level changes and fluvial controls on the geomorphic evolution of the Thalassery river mouth, southwest Kerala coast, India
Late Quaternary evolution of piedmont faults in the Darjeeling-Sikkim Himalaya, India
Geology (15 obras) · Geography (13 obras) · Geology and Paleoclimatology Research (13 obras) · Radiocarbon dating (10 obras) · Archaeology (9 obras) · Paleontology (9 obras) · Physical geography (9 obras) · Holocene (8 obras) · Geological formations and processes (7 obras) · Fluvial (6 obras)