Praveen Kumar MishraCluster University of Jammu · Geology
Praveen Kumar Mishra
Dr. rer. nat.
https://praveenmishra.weebly.com/
About
40
Publications
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463
Citations
Citations since 2017
Introduction
Additional affiliations
May 2016 - May 2016
March 2015 - July 2015
September 2011 - present
Publications
Publications (40)
Lakes from the Indian subcontinent are ecosystems of vital importance as they contain high levels of biodiversity which is threatened by multiple anthropogenic pressures and the impacts of ongoing global warming. The present review article examines the morphometric features of 35 lakes from the Indian subcontinent and explores the links between lak...
The Himalaya is a biodiversity hotspot and provides critical ecosystem services to the region. The climate change significantly influences the Himalaya and brings about changes in vegetation distribution that in return affects the number of livelihoods. Despite high susceptibility, climate change impacts on the ecosystem have not been properly exam...
In the recent years, the growing concern to understand the impact of climate variability on various aspects of human civilizations have led to developing an understanding of proxy response according to change in the environmental conditions. Among various climate-sensitive proxies (e.g., geochemistry, pollens, biomarkers, grain size, etc.), the sta...
The timings and extent of anthropogenic impacts in the Indian Himalayas are poorly characterized, ambiguous and difficult to determine. In present study, we investigated the compositional variation, concentration, and temporal trend in the polycyclic aromatic hydrocarbons (PAHs) and fecal biomarker (coprostanol and epi-coprostanol) from the lake se...
The evolution of the monsoonal climate in the Indian Himalayan region remains poorly understood due to the sparse coverage of paleoclimatic datasets. In the present paper, elemental concentrations and grain size are measured for a radiocarbon-dated sediment core retrieved from Shilloi Lake (Nagaland, India) to understand climate variability over no...
Delineating the impact of various natural and anthropogenic drivers on the environment is a paramount challenge in paleoenvironmental reconstruction. In the present study, we used faecal biomarker (coprostanol) and polycyclic aromatic hydrocarbons (PAHs) in the lake sediments alongside population census and meteorological parameters from Central Hi...
The understanding of long-term climate variability may provide valuable perspective on possible response of human societies to modern climate changes. The present study, based on the geochemical and sedimentological analyses on well dated (using AMS ¹⁴ C and optically stimulated luminescence-OSL dates) alluvial sediments from Sina River basin (in M...
Freshwater aquatic systems are subjected to rapid deterioration driven by multiple stressors such as climate change and human activity. The understanding of the long-term history of eutrophication and their trends provides an opportunity for developing relevant management strategies. In this study, we examine the natural versus anthropogenic impact...
In recent decades, the ecologically sensitive region of NW Himalaya, a transition zone between the westerlies and the Indian summer monsoon (ISM), has witnessed extreme precipitation events as well as an increase in seasonal temperatures, the impact of which on the lacustrine systems is unknown. In this study, we use a two-pronged approach involvin...
We present a comprehensive analysis of paleoclimate datasets available from the Indian subcontinent over the last 20 kyr BP. This assessment is essential for understanding the spatio-temporal changes in the complex monsoonal system that not only governs the climatic changes across the Indian landmass but also directly impacts the country's agrarian...
The sources and state of sedimentary organic matter (SOM) in fresh water aquatic systems are important to understand the carbon cycling in terrestrial environments. The composition of organic matter in the lake sediments demonstrates the physical and chemical condition of the lake ecosystems. However, the systematic and structured investigations fo...
The variability in the monsoon precipitation and its impact on socioeconomic status has motivated to perform a detailed investigation into understanding of teleconnections, forcing factors, and their validation in terms of observational data. In this study, we have presented an overview of hydrological changes since Holocene using proxy reconstruct...
The Holocene epoch has witnessed several natural climate variations and these are well encoded in various geological archives. The present biomarker investigation in conjunction with previously published multi-proxy records was applied to reconstruct organic matter (OM) sources forming the peat succession spanning the last 8000 cal yr BP and shift...
Stable isotopic compositions of carbon (C) and nitrogen (N) in lake sediments have the potential to decipher natural and anthropogenic influences in a region, which has undergone significant cultural changes in the recent past. In this study, using carbon (d13C) and nitrogen (d15N) isotopic compositions of organic matter along with C isotopic ratio...
Freshwater aquatic systems are subjected to rapid deterioration driven by multiple stressors such as climate change and human activity. The understanding of the long-term history of eutrophication and their trends provides an opportunity for developing relevant management strategies. In this study, we examine the natural versus anthropogenic impact...
The occurrence, distribution, characterization and quantification of microplastics (MPs) and phthalates (PAEs) from the fresh water aquatic environment are not thoroughly explored in the Indian Himalayas despite concern over their adverse effects on human health and ecosystem. In this study, we have investigated the presence of MPs and PAEs in an a...
Extreme climate events have been identified both in meteorological and long-term proxy records from the Indian summer monsoon (ISM) realm. However, the potential of palaeoclimate data for understanding mechanisms triggering climate extremes over long time scales has not been fully exploited. A distinction between proxies indicating climate change,...
To understand the factors controlling origin and distribution of fluoride concentration in groundwater of the Indo-Gangetic plain comprising the Indian states of Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, and West Bengal, 209 groundwater samples are analyzed for their fluoride concentration, electrical conductivity (EC) and pH. The relation betw...
Geochemical and end-member mixing analyses (EMMA) of the grain-size distribution were conducted on recent surface sediments from Ashtamudi Estuary, Southern India to investigate the hydrodynamic factors that influence the depositional processes in the region. The complex interplay between the natural (fluvial and marine) and anthropogenic influence...
We aim to develop comprehensive picture of late Holocene climate variability over the NorthEastern India to address the existing large spatial gaps in paleoclimate data coverage in Indian subcontinent. This region receives precipitation only from the Indian Summer Monsoon (ISM) and lies in the region sensitive to the impact of various teleconnectio...
Elemental (TOC, TN, C/N) and stable isotopic (δ15N) compositions coupled with n-alkane (n-C14-C38) and amino acids (AA) concentrations were measured on various potential organic matter (OM) sources such as aquatic and terrestrial plants, catchment and lake surface sediments from Ahansar Lake, Kashmir valley (India) to disentangle organic matter sou...
We present late Quaternary lake level reconstruction from the high altitude Tso Moriri Lake (NW Indian Himalaya)
using a combination of new and published data from shallow and deep water cores, and catchment
geomorphology. Our reconstruction indicates two dramatic lake level increases – a late glacial (ca.
16.4–12.6 cal kyr B.P.) rise of 65 m, and...
High resolution reconstructions of the India Summer Monsoon (ISM) are essential to identify regionally different patterns of climate change and refine predictive models. We find opposing trends of hydrological proxies between northern (Sahiya cave stalagmite) and central India (Lonar Lake) between 100 and 1300 CE with the strongest anti-correlation...
We present elemental and grain-size distributions obtained from the sediment core of the continental shelf adjacent to the Rushikulya river mouth, eastern India to quantify the paleoclimatic changes. The retrieved 1.60 m long well dated core spans the past ca. 6800 cal BP. The modern spatial distribution of grain size and geochemistry of the inner-...
We use multiple proxies (δ13Corg, δ15Norg, C/N, amino acids, biogenic silica), on catchment, lake surface and core sediments to (i) identify the factors influencing conventional lacustrine primary productivity (LPP) indicators (isotopic covariance, C/N) in the sediments from pristine high altitude Tso Moriri Lake during the late Quaternary, (ii) co...
High resolution isotopic (δ18O and δ13C) investigations on endogenic carbonates (calcite/aragonite) from Tso Moriri Lake, NW Himalaya show dramatic fluctuations during the late glacial and the early Holocene, and a persistent enrichment trend during the late Holocene. Changes in this lake are largely governed by the [input (meltwater+monsoon precip...
We present the results of our investigations on the radiocarbon dated core sediments from the Lake Tso Moriri, NW Himalaya aimed at reconstructing palaeohydrological changes in this climatically sensitive region. Based on the detailed geochemical, mineralogical and sedimentological analysis, we recognise several short-term fluctuations superimposed...
We report the results of our investigations on the catchment area, lake surface sediments, and hydrology of the high altitude alpine Tso Moriri Lake, NW Himalayas (India). Our results indicate that the lake is currently alkaline, and thermally stratified with an oxic bottom layer. Results
from hydrochemistry and isotopic composition (δ 18 O and δD)...
We present the results of biogeochemical and mineralogical analyses on a sediment core that covers the Holocene sedimentation history of the climatically sensitive, closed, saline, and alkaline Lonar Lake in the core monsoon zone in central India. We compare our results of C/N ratios, stable carbon and nitrogen isotopes, grain-size, as well as amin...
We present high resolution studies on radiocarbon dated lake sediments from Tso Moriri Lake, NW Himalaya
(78�14’-78�25’N and 32�40’-33�02’E; altitude: 4600 m, max depth: 105m). This lake is situated in the transition
zone between both mid latitude westerlies and Indian summer monsoon zone, thus it is a key site to reconstruct
past climate variabili...
The available data on Holocene climate variability from Asia indicates spatio-temporal changes in the precipitation over this vast region. Timing, duration, regionality, and causes of these fluctuations are not well understood, especially over the Indian subcontinent. We present high resolution studies on radiocarbon dated lake sediments from the T...
The available data on Holocene climate variability from Asia indicates
spatio-temporal changes in the precipitation over this vast region.
Detailed information on the timing, duration, regionality, and causes of
these fluctuations is not well understood, especially over the Indian
subcontinent. My work focuses on long core sediments from lake Tso
M...
Questions
Questions (33)
Can anyone please help me to understand the application of WA (weighted average) and WA-PLS (weighted average-partial least square) regression methods in pollen studies in simple language?
Thank you
How the proxy data (from lacustrine records) are useful to validate climate models for future climate predictions?
Any suggestion would be great.
Thank you
In the NW Himalaya (especially in Jammu and Kashmir region), what are the precipitation period associated with westerly contribution - DJF or DJFMAM?
There are different school of thoughts: some says the peak westerly precipitation in NW Himalaya is DJF, whereas, in other studies, the winter precipitation month ranges between Dec to May (i.e., DJFMAM).
Hi,
Is there any relationship between a cyclonic storm in Bay of Bengal (BOB), SST of BOB and rainfall events in the coastal region of India?
Would be great to have any suggestions.
Thank you
Hi,
I have trace element data (using ICPMS) of the bulk sediments from the lake bottom.
I would like to calculate the elemental ratios (e.g., Rb/Sr; Sr/Ca, etc.).
Is there any method available to calculate apportionment of Sr in both silicate or carbonate fractions?
What kinds of additional parameters, do I need for this calculation?
Thank you
I am looking for a book
"Radiocarbon dating practices at ANU" by Gupta and Polach, published in 1985.
Can anyone please provide the link or source from where I can get this book?
Thank you
How spatial inhomogeneity in paleoclimate records biased the interpretation of past climate variability. In some of the model-based studies, the advantage of spatial homogenous gridded data has been discussed beautifully. But I couldn't find any literature or article dealing with the role of the spatial distribution of climate data in paleoclimate study.
I would appreciate your suggestions.
Thank you
Hi,
I would like to calculate the hydrological budget (HB) of the region which is partially covered by forest and heavily influenced by human activity. As I understand, the hydrological budget is largely dependent on the following factors (i) moisture contribution (regional and local), (ii) evaporation from the local water bodies, (iii) and evapotranspiration from the forest.
Is there any way by which we can calculate the hydrological budget from any region using the factors I have discussed above.
Also, it would be nice, if someone can suggest any papers to calculate the HB of the region.
Thank you
In a correlation analysis, is there any rule/assumption that we should follow to calculate the p-values? For examples,
(1) r (between Al2O3 and TiO2) = 0.65
n (observation) = 15
(2) r (between Al2O3 and TiO2) = 0.5
n (observation) = 30
In both the cases, are the p-values will be different? If yes, then How?
Hi,
Can any one please identify the name of the book. I have a copy of one chapter (attachment).
This book is related to archaeology and famines.
Thank you
Hello everyone,
Recently, I was looking for some basic article regarding climate modeling, I found some interesting fact that some of the authors considered paleoclimate modeling is a very difficult task as compared to the modern climate modeling.
I do not understand their argument. I thought paleoclimate modeling is relatively easier because of a single parameter (i.e. natural variability) is involved. However, in modern climate modeling, two components (ie natural as well as anthropogenic) are involved.
I am a bit confused about the terminology used for Sunderban (in West Bengal, India). Is it a delta or estuarine settings.
Or I would say, Sunderban is a complex system of the delta which consists of tidal rivers, estuaries, mangrove forests and creeks.
Thank you
I have a geochemical data from the estuarine sediments. I would like to calculate the pollution and accumulation index of the samples. But I am a bit confused about which background value (UCC or PAAS) should I use.
Projects
Projects (7)
The historical record of persistent organic pollutants in aquatic environments from the Indian Himalayas were poorly characterized as of now. In this study, we are assessing the compositional variation, concentration, and temporal trend in the polycyclic aromatic hydrocarbons (PAHs) coupled with faecal biomarker (coprostanol) from the sediment core retrieved from Garur lake in the central Himalayas.
With this project, we aim to understand the effect of natural and anthropogenic drivers on aquatic environments.
The major highlights-
1. Historical changes of biogeochemical proxies in response to natural/vs human-induced changes.
2. Systematic investigations to decouple the natural and anthropogenic drivers governing the dynamics of the carbon budget.
3. Provide baseline information for policymakers and environmentalists to develop a strategical framework for future environmental changes.
Decipher shift in the palaeohydrological conditions in the Kedarnath region, Himalaya and its effect on the ambient vegetation
