Supriyo Chakraborty

Supriyo Chakraborty
Indian Institute of Tropical Meteorology | IITM · Centre for Climate Change Research

PhD

About

124
Publications
39,251
Reads
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1,516
Citations
Additional affiliations
September 2007 - present
Indian Institute of Tropical Meteorology
Position
  • Scientist-E
Education
July 1985 - April 1986
Indian Institute of Technology Kharagpur
Field of study
  • Exploration Geophysics
July 1981 - April 1983
Indian Institute of Technology Kharagpur
Field of study
  • Geological Sciences

Publications

Publications (124)
Article
Full-text available
The intra-seasonal variation in precipitation isotopes shows a characteristic declining trend over northeast India. As of now, no mechanism offers a consistent explanation of this trend. We have performed the isotopic analysis of precipitation (rain) and estimated net ecosystem exchange and latent heat fluxes using an eddy-covariance system in nort...
Article
Full-text available
A giant clam shell (Tridacna maxima) collected from the lagoon of Minicoy Island in the southern Lakshadweep Archipelago, India, was used for a high-resolution stable isotope (δ¹⁸O, δ¹³C) analysis. The results reveal a cyclic pattern in δ¹⁸Oshell values, interpreted as combined signatures of seasonal temperature and δ¹⁸Osw fluctuations over the per...
Article
The rapid conversion of tropical rainforests into monoculture plantations of rubber (Hevea brasiliensis) in Southeast Asia (SEA) necessitates understanding of rubber tree physiology under local climatic conditions. Frequent fog immersion in the montane regions of SEA may affect the water and carbon budgets of the rubber trees and the plantation eco...
Article
Methane (CH4) is a potent greenhouse gas and also plays a significant role in tropospheric chemistry. High-frequency (sub-hourly) measurements of CH4 and carbon isotopic ratio (δ¹³CH4) have been conducted at Pune (18.53°N, 73.80°E), an urban environment in India, during 2018–2020. High CH4 concentrations were observed, with a mean of 2100 ± 196 ppb...
Technical Report
Full-text available
The Earth's temperature is progressively increasing, which in turn is intensifying the hydrological cycle. Since a warmer atmosphere holds more water vapor, the water cycle is expected to intensify. One of the consequences of the water cycle intensification is increased precipitation. Though several areas across the globe are recording increased pr...
Article
Full-text available
Evapotranspiration denotes the transport of water vapor between an ecosystem and atmosphere comprising the biotic (transpiration) and abiotic (evaporation) components. Additionally, the water vapor transports the energy used for its vaporization, the latent heat. In the present study we compare the ecohydrological cycle of a mangrove on the Bay of...
Article
Tropical forest ecosystems play a significant role in controlling the global carbon cycle. Several bio-meteorological parameters control the carbon dynamics of a forest ecosystem. We have studied the bio-meteorological processes of a tropical semi-deciduous forest in northeast India to understand the dynamics of the net ecosystem exchange (NEE). On...
Article
Full-text available
The terrestrial biosphere plays a pivotal role in removing carbon from the atmosphere. The removal processes are primarily affected by the presence of extreme temperature in the atmosphere. Little information is available on carbon removal response by the terrestrial biosphere during extreme temperature events over the Indian region. India has witn...
Article
Full-text available
The tooth enamel from the human remains of ten archaeological individuals belonging to a chalcolithic site at Inamgaon, District Pune, Maharashtra, were analysed for stable carbon and oxygen isotope compositions. The human remains of the involved individuals come from three consecutive periods: Period I (1600-1400 BC; n=2), Period II (1400 - 1000 B...
Chapter
Full-text available
The isotopic analysis of carbonates is widely used to get information on past monsoon variability. A systematic study addressing a fundamental issue, how do the oxygen isotopes respond to large-scale processes, is still lacking. We have generated precipitation isotopic records from the Andaman Islands, Bay of Bengal, to investigate how the precipit...
Chapter
Full-text available
The isotopic analysis of carbonates is widely used to get information on past monsoon variability. A systematic study addressing a fundamental issue, how do the oxygen isotopes respond to large-scale processes, is still lacking. We have generated precipitation isotopic records from the Andaman Islands, Bay of Bengal, to investigate how the precipit...
Article
Full-text available
Using information contained in the eighteenth to twentieth century British administrative documents, preserved in the National Archives of India (NAI), we present a 218-year (1729–1947 AD) record of socioeconomic disruptions and human impacts (famines) associated with ‘rain failures’ that affected the semi-arid regions (SARs) of southern India. By...
Chapter
The Indian monsoon rainfall is characterized by a high degree of spatial and temporal variability. While instrumental records are used to analyse the spatial scale monsoon variability, long-term records are needed to assess its variability in the temporal domain. Proxy derived paleoclimate records provide a reliable means to investigate the nature...
Article
The atmospheric methane (CH4) concentration has increased in recent years due to natural and anthropogenic causes. Hence, it is essential to quantify the potential sources of CH4 to understand the factors responsible for its fluxes on a local to regional scale through in situ observations. Coastal wetlands, particularly the mangrove ecosystems in t...
Chapter
Full-text available
In the original version of the book, belated corrections as listed below are incorporated: Chapter 1: The caption of figure 1.5 has been changed as follows: Spatial patterns of change in the June–to-September seasonal precipitation (mm day −1) over the globe in the left-hand column, and over India in the right-hand column. In the top row are plotte...
Article
Full-text available
Among the natural ecosystems, forests and wetlands emit a sizable amount of carbon dioxide (CO2) and methane (CH4) through autotrophic and heterotrophic respiration and bacterial activities. Interestingly, some evidence suggests that a significant amount of CH4 is generated by the trees in forested ecosystems. The net ecosystem exchange (NEE), meas...
Article
We studied the ecosystem-atmosphere carbon and water fluxes and their coupling at a broadleaf deciduous forest (Kaziranga National Park, KNP) and a coniferous evergreen forest (Kosi-Katarmal watershed, KKM) in subtropical India using the eddy covariance measurements. We analysed the data statistically in a bigleaf framework to compare the annual an...
Article
Full-text available
Proxy and model-based studies suggest multi-scale temporal variability in the Indian summer monsoon (ISM). In this study, using the CESM1 atmospheric general circulation model, we carried out multiple ensemble AGCM simulations for the Mid-Holocene (MH; ≈ 6 kyr BP), Medieval Warm Period (MWP; ≈ 1 kyr BP), Little Ice Age (LIA; ≈ 0.35 kyr BP), and His...
Article
Full-text available
The carbon and oxygen isotopic composition of tooth enamel is connected to the diet and environment in which it develops. Enamel is invariably preserved for a long time and hence provides the best material for chemical analysis. Teeth are known to reflect a record of dietary and environmental changes taking place during their growth. This paper pre...
Article
Full-text available
Amongst all the anthropogenically produced greenhouse gases (GHGs), carbon dioxide (CO 2 ) and methane (CH 4 ) are the most important, owing to their maximum contribution to the net radiative forcing of the Earth. India is undergoing rapid economic development, where fossil fuel emissions have increased drastically in the last three decades. Apart...
Article
Full-text available
Climate impacts agriculture in various complex ways at different levels and scales depending on the local natural crop growth limitations. Our objective in this study, therefore, is to understand how different is the atmosphere–biosphere exchange of CO2 under contrasting subtropical and boreal agricultural (an oilseed crop and a bioenergy crop, res...
Chapter
The isotopic analysis of precipitation provides useful information on a variety of hydrological and atmospheric processes. The dynamical characteristics of precipitation isotopes have been well investigated, but a systematic study of their statistical behavior seems to be lacking. We have performed the statistical analysis, basically the distributi...
Chapter
Full-text available
The isotopic analysis of precipitation provides useful information on a variety of hydrological and atmospheric processes. The dynamical characteristics of precipitation isotopes have been well investigated, but a systematic study of their statistical behavior seems to be lacking. We have performed the statistical analysis, basically the distributi...
Article
Full-text available
The appearance of COVID-19 in December, 2019 in China and its rapid spread all over the globe, forced the governments to severely curb the social and economic activities of their respective countries. Barring the essential services, most of the business activities and transport sectors have been suspended and an unprecedented lockdown imposed over...
Article
Reef building corals are known to provide high resolution records of ocean-atmospheric variables for the last several centuries. The most important parameter is the sea surface temperature, which is accurately recorded by the oxygen isotopic composition as well as by a few trace elemental ratios such as, Sr/Ca, Mg/Ca, U/Ca, etc. Determination of th...
Chapter
Full-text available
The overall decrease of seasonal summer monsoon rainfall during the last 6–7 decades has led to an increased propensity for droughts over India. Both the frequency and spatial extent of droughts have increased significantly during 1951–2016. In particular, areas over central India, Climate model projections indicate a high likelihood of increase in...
Chapter
Full-text available
The current state of the greenhouse gas concentrations and the atmosphere-biosphere carbon fluxes across India are discussed.
Article
Mangrove ecosystems play a crucial role in the global carbon cycle. However, the carbon fluxes in the mangrove ecosystems found in the Indian subcontinent are not well understood. Here, for the first time, we estimate the net ecosystem exchange (NEE) in a mangrove ecosystem at Pichavaram, southeast India, using the eddy covariance method for the pe...
Article
Full-text available
The Indian summer monsoon is one of the most important yet less understood synoptic processes on the Earth, characterized by an increased amount of rainfall over the entire Indian landmass. The different types of forest ecosystems existing over the Indian region offer a tremendous carbon sequestration potential useful for the global mitigation of c...
Book
Full-text available
This open access book discusses the impact of human-induced global climate change on the Indian subcontinent and regional monsoon, the adjoining Indian Ocean and the Himalayas. It also examines the regional climate change projections based on the climate models used by the IPCC Fifth Assessment Report (AR5) and national climate change modeling stud...
Article
Indian summermonsoon rainfall is characterized by a considerable variability on the spatial and temporal scale, though the standard deviation of rainfall on the temporal scale is much smaller (ca. 10% of annual long-term mean) compared with that of the spatial scale. It is known that the seasonal rainfall amplitude over India as well as the statist...
Article
Full-text available
We present precipitation isotope data (δ2H and δ18O values) from 19 stations across the tropics collected from 2012 to 2017 under the Coordinated Research Project F31004 sponsored by the International Atomic Energy Agency. Rainfall samples were collected daily and analysed for stable isotopic ratios of oxygen and hydrogen by participating laborator...
Article
Full-text available
We present precipitation isotope data (δ2H and δ18O values) from 19 stations across the tropics collected from 2012 to 2017 under the Coordinated Research Project F31004 sponsored by the International Atomic Energy Agency. Rainfall samples were collected daily and analysed for stable isotopic ratios of oxygen and hydrogen by participating laborator...
Article
Water scarcity is a leading concern in both developing and developed nations. Coping with water scarcity requires an understanding of various hydrological processes that act upon precipitation, surface and groundwater at a local scale. We measured isotopic signatures of several water samples from two distinct ecosystems, i.e. tropical savanna in th...
Article
Full-text available
Using nine model simulations from the PMIP3, we study simulated mean Indian summer (June–September) climate and its variability during the Last Millennium (LM; CE0850-1849) with emphasis on the Medieval Warm Period (MWP; CE1000-1199) and Little Ice Age (LIA; CE1550-1749), after validation of the simulated ‘current day (CE1850-2005)’ climate and tre...
Article
Guwahati, the largest urban corridor of Northeast India, is one of the United Nations Educational, Scientific and Cultural Organization (UNESCO) world heritage sites and one of the 200 eco-regions in the world. The present study investigates the characterization of chemical components and sources of precipitation samples collected in Guwahati durin...
Presentation
Full-text available
The changing Indian climate, and ENSO teleconnectiosn to the Indian summer monsoon through last millennium, as simulated by the PMIP3 models. The work reconciles the warm & wet (cold and dry) Indian summer climate Medivial warm period (little ice age) condition through a modulation of the ENSO-MOnsoon teleconnections through slow background chnages...
Article
Full-text available
Indian summer monsoon rainfall is characterized by a considerable variability on the spatial and temporal scale, though the standard deviation of rainfall on the temporal scale is much smaller (ca. 10% of annual long-term mean) compared with that of the spatial scale. It is known that the seasonal rainfall amplitude over India as well as the statis...
Article
Full-text available
Mangrove ecosystem is one of the important coastal ecosystems providing ecological security of the coastal area and livelihood security to the coastal fishermen. Besides it plays an important role in carbon sequestration as large amount of carbon is stored in the below ground biomass. The role of mangrove restoration in carbon stocking has not been...
Article
Full-text available
Total organic carbon profile in sea water (depth-wise) and sediment has been investigated on seasonal basis in the coral reef ecosystem of Agatti island, Lakshadweep sea. The TOC values of sea water and sediment were converted into percentage to understand its level of distribution. The level of TOC in the surface sea water ranged from 0.40 to 1.02...
Article
Full-text available
This study uses one year of eddy covariance flux observations to investigate seasonal variations in evapotranspiration and surface energy budget closure at a tropical semi-deciduous forest located in north east India. The annual cycle is divided into four seasons, namely: pre-monsoon, monsoon, post-monsoon, and winter. The highest energy balance cl...
Article
We have estimated in this study the annual net ecosystem productivity (NEP) of Kaziranga National Park by using real-time eddy covariance data. We partitioned the net CO 2 flux into gross primary productivity and ecosystem respiration (R e) using standardized method. Estimated annual NEP of the ecosystem 92.93 ± 1.7 g C m-2 year-1 indicated that th...
Article
Full-text available
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Conference Paper
Full-text available
Future climate change is slated to reduce the agricultural productivity in some regions of the world, while it may or may not see an increase in the other regions. On the other hand, food production needs to be accelerated to feed an increasing global population and thus may overburden the already stressed ecocystems. In this context, our objective...
Article
Full-text available
The atmospheric stable isotopes in rainwater are measured as the ratio of heavy to the lighter (e.g., 18O/16O). This data article describes two datasets of daily rain isotopic variations during the Indian Summer Monsoon (ISM) season. Firstly, an island site (namely Port Blair) dataset for four years (2012-2015) and another dataset of Indian mainlan...
Article
Full-text available
To study the atmospheric moisture transport processes from the source to a receiver region, isotopic analysis of rainwater from Port Blair (as source region), the Andaman Islands, Bay of Bengal has been carried out. In addition to the island site, rainwater collected at three sites on the Indian mainland (as receiver region) namely Nagpur, Kolkata,...
Book
Full-text available
Bulletin of the Indian Meteorological Society Pune chapter Annual Monsoon Workshop (AMW-2018) And Prof. D. R. Sikka Memorial National Symposium on “Role of Weather & Climate Observations and Forecasting on increasing Agricultural Productivity & Risk Management”. _____________________________________________________________________ Authors: IMSP...
Article
For the first time, the exchange of greenhouse gases, such as CO2 and H2O vapour, between the biosphere and the atmosphere at an eastern Himalayan site in India has been investigated. This study was carried out over a high altitude (2286 m asl) evergreen coniferous forest (27.04°N, 88.08°E), where we measured the fluxes of CO2 and H2O vapour along...
Article
Full-text available
The eddy covariance method is a powerful technique for quantification of \(\hbox {CO}_{2},\) \(\hbox {H}_{2}\)O and energy fluxes in natural ecosystems. Leaf area index (LAI) and its changes are significant drivers of \(\hbox {CO}_{2}\) and \(\hbox {H}_{2}\)O exchange in a forest ecosystem due to their role in photosynthesis. The present study repo...
Article
This study presents an analysis of the Indian summer monsoon (ISM) rainfall variations for a 1460-year period (1720–3180, Before Present BP: 1950 AD), based on a long record of stable isotopic variations (δ¹⁸O) with high temporal resolution (~annual) obtained from a U-Th dated stalagmite from the Kadapa cave in peninsular India. This stalagmite pro...
Article
During the Mature period (2600–1900 BCE) of the Indus Civilization, Gujarat was occupied by two types of settlements, the settlements with predominantly Classical Harappan traits and the settlements with predominantly Sorath traits. Most reconstructions of the data conclude that the settlements with Classical Harappan traits in Gujarat were engaged...
Article
An observational investigation on the environmental variables in the coral reef ecosystem of the Lakshadweep Sea was made with reference to coral bleaching. The investigation was done during 2014–2015 in selected islands of Lakshadweep Sea. The environmental variables recorded were sea surface temperature (SST; 28.1–31.5 ° C), salinity (34.0–38.36...