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Nawaz Ali, S.
- Diversity of Diatom and Carbon Isotope Characterization of Soil Organic Matter in Extreme Climate, Sikkim Himalaya, India
Abstract Views :223 |
PDF Views:109
Authors
Jyotsna Dubey
1,
Biswajeet Thakur
1,
Shailesh Agrawal
1,
Anupam Sharma
1,
P. Morthekai
1,
Vaibhava Srivastava
2,
S. Nawaz Ali
1
Affiliations
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN
2 Department of Geology, Faculty of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN
2 Department of Geology, Faculty of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 119, No 4 (2020), Pagination: 649-660Abstract
Analysis of spatial variation of diatom assemblages and characterization of carbon isotopic composition of surface soil/sediment samples along three high-altitude transects (Chopta, Lashar and Gurudongmar valleys) in North Sikkim, Higher Himalaya have been done to delineate the ecological information (modern analogue). We have studied the variation in the distribution of diatom species and stable carbon composition in three different valleys having variable climatic conditions ranging from sub-humid to semi-arid. The results reveal that the biotic components respond appreciably towards varying environmental conditions. The spatial distribution of diatoms in surface sediments seems to be controlled by physical parameters such as temperature, water and nutrient availability. The overall δ13C values vary from ‒25‰ to ‒29‰, suggesting a C3-dominated vegetation in the region. Higher δ 13C values are observed in Gurudongmar samples that are characterized by less moisture and low temperature. The δ 13C values suggest that the source of organic matter in soil/sediment is contributed by open grasslands (C3 grasses). The isotope values clearly demonstrate an increase in δ 13C values along with a progressive increase in elevation and decrease in precipitation. The present data will serve as an important archive for future correlations in palaeoclimatic studies.Keywords
Carbon Isotopes, Diatom Distribution, Extreme Climate, Modern Analogue, Soil Organic Matter.Full Text
- Space-Based Observation of a High-Altitude Red-Coloured Glacial Lake in Ladakh, Northwest Himalaya, India
Abstract Views :219 |
PDF Views:80
Authors
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Birbal Sahni Institute of Paleosciences, Lucknow 226 007, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Birbal Sahni Institute of Paleosciences, Lucknow 226 007, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 429-431Abstract
The present study reports the existence of a unique and unusual feature of the Zanskar valley, Ladakh, India – a proglacial ‘red/brown-coloured lake’ observed from space-based remote sensing data. The lake has not changed in colour and size over the years. Here we report observations from 2004 onwards till recently. The local geology plays an important role, and iron-dominated lithology of the region interacts with snow and glacial meltwaters and subsequently deposits red/brown-coloured suspended silt in this proglacial lake. Spectral analysis of reflectance data from Sentinel-2 images in visible–infrared region of electromagnetic spectrum suggests that the colour of the lake is due to high concentration of suspended solids, having dominant reflectance at 660–700 nm and thus causing the red/brown colour of the water.Keywords
Proglacial Lake, Remote Sensing, Spacebased Observations, Suspended Solids.Full Text
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