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Yadav, Ram R.

Chir Pine Ring-Width Thermometry in Western Himalaya, India

Age of Himalayan Cedar Outside its Natural Home in the Himalayas

Treeline Migration and Settlement Recorded by Himalayan Pencil Cedar Tree-Rings in the Highest Alpine Zone of Western Himalaya, India

Abstract Views :300 | PDF Views:96

Authors

Krishna G. Misra ¹, Vikram Singh ¹, Akhilesh K. Yadava ¹, Sandhya Misra ¹, Ram R. Yadav ²

Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
2 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, IN

Source

Current Science, Vol 118, No 2 (2020), Pagination: 192-195

Abstract

Himalayan pencil cedar (Juniperus polycarpos) is an evergreen tree distributed from Afghanistan, Baluchistan, Kagan valley, Kashmir, Lahaul-Spiti to upper reaches of western Tibet¹. Naturally, the lower and upper limit of a tree species over a specific region varies due to the ecological settings of the area. Recently it has been noted that due to global/ regional climatic changes there is marked change in distribution and composition of vegetation at its upper limit. Various studies from different parts of the globe indicate migration and shifting of treeline towards the higher altitudes^2-15. Treeline migration/shifting have also been recorded from the Indian Himalaya by studying treeline dynamics over Uttarakhand- Himachal Pradesh^16,17 and Sikkim¹⁸. Himalayan pencil cedar is known to grow generally at high altitudes with the highest treeline recorded from the forest of Juniperus tibetica at southeast Tibet (~4900 masl)¹⁹ and Juniperus sp. in Hunza-Karakorum (~3900 masl)²⁰. Demarcation of the upper limit of treeline in complex mountainous terrains remains a challenging task.

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Tree-Ring-Width Chronologies from Moisture Stressed Sites Fail to Capture Volcanic Eruption Associated Extreme Low Temperature Events

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Authors

Ram R. Yadav ¹, Jayendra Singh ¹

Affiliations
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, IN

Source

Current Science, Vol 119, No 2 (2020), Pagination: 189-194

Abstract

Tree-rings have been extensively used to develop temperature reconstructions using conifer species growing in different parts of the Himalaya. The reconstructions are based on the existence of both positive and negative relationship between the tree-ring chronologies and instrumental temperature records. However, the reconstructions based on positive relationship between tree-ring and temperature series are few. Regional temperature reconstructions developed using tree-ring series have revealed a significant correlation with the regional data which degraded gradually with distance from the tree-ring sampling sites indicating dominant orographic control on climate. On critical assessment of the available tree-ring-based temperature reconstructions, glaring anomalies were reported especially in case of the extreme years coinciding with the volcanic eruption associated cooling. Tree-ring-based reconstructions from Kashmir and Nepal, where temperature has direct forcing on tree-ring widths, indicated unusually cold temperatures in 1816, coinciding with the Tambora volcanic eruption in April 1815 in Indonesia. However, in the case of the chronologies having negative relationship with temperature, usually warmer conditions are reconstructed against the narrow rings usually observed in 1816. The narrow rings in 1816 could have been caused due to volcanic eruption induced cooling as well as reduced solar radiation restricting the photosynthesis. Thus changes in the limiting factor led to the break in relationship between tree-ring indices and climate parameters. In view of this, it is suggested that the environmental variables having direct relationship with tree growth should be reconstructed from tree-ring chronologies as there exists a fair possibility that the growth limiting factor such as temperature remains stable over time.

Keywords

Himalaya, Tambora, Temperature Reconstruction, Tree-Ring-Width, Volcanic Eruption, Wood Density.

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Regional disparity in summer monsoon precipitation in the Indian subcontinent during Northgrippian to Meghalayan transition

Abstract Views :184 | PDF Views:77

Authors

Som Dutt ¹, Anil K. Gupta ², Rahul Devrani ¹, Ram R. Yadav ¹, Raj K. Singh ³

Affiliations
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 School of Earth, Ocean and Climate Sciences, Indian Institute of Technology Bhubaneswar, Argul 752 050, IN

Source

Current Science, Vol 120, No 9 (2021), Pagination: 1449-1457

Abstract

The present study reveals distinct spatial variability of summer monsoon precipitation in Indian subcontinent during Northgrippian to Meghalayan transition. Protracted dry phase lasting ~1000 yrs was observed ~4.2 ka BP in southern and northwestern India whereas 200–300 yrs event occurred in northeastern parts. Strong El Niño conditions beginning ~4.3 kyr BP were associated with the millennial long dryness in western parts but its influence was limited in the eastern region. Cross-verified, high-resolution records from different geographic regions of India are still required to ascertain if regional differences occurred in span and magnitude during Northgrippian to Meghalayan transition.

Keywords

Indian summer monsoon, Indus civilization, Late Holocene, 4.2 ka event, Meghalayan age

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Sub-alpine Himalayan Birch in Cold Arid Lahaul-spiti, Himachal Pradesh, India: A Proxy of Winter/early Spring Minimum Temperature

Abstract Views :155 | PDF Views:94

Authors

Vikram Singh ¹, Krishna G. Misra ¹, Akhilesh K. Yadava ¹, Ram R. Yadav ²

Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow 226 007, IN
2 Wadia Institute of Himalayan Geology, 33, G.M.S. Road, Vijay Park, Dehradun 248 001, IN

Source

Current Science, Vol 123, No 1 (2022), Pagination: 22-25

Abstract

No abstract.

Keywords

No keywords.

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