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Bhattacharyya, Amalava
- Palaeoclimatic Scenario of Antarctica during Quaternary-Emphasis to Indian Research
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1 Lucknow, IN
2 New Delhi, IN
1 Lucknow, IN
2 New Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 1091-1092Abstract
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- Temporal and Spatial Variations of Late Pleistocene-Holocene Climate of the Western Himalaya Based on Pollen Records and their Implications to Monsoon Dynamics
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Affiliations
1 Birbal Sahni lnstitute of Palaeobotany, 53, University Road, Lucknow, IN
1 Birbal Sahni lnstitute of Palaeobotany, 53, University Road, Lucknow, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No Spl Iss 3 (2006), Pagination: 507-515Abstract
A review of the published records of Late Pleistocene-Holocene climate of the western Hlmalaya reveals that though the Ladakh area in the Trans-Himalayan region has been expenencing an and climate for more than 40 ka B P it was relatively less and during the last glacial period when compared to the Holocene conditions Within the last glacial and phase there were several short, warm and moist events (interstadials)around 30, 21, 18 375, 16 and 10 ka B P Many of them have been recognized from the Greater and outer Himalaya also Data for the Holocene from the Ladakh and other Trans-Himalayan sites are almost lacking The clrmate of the Greater and outer Himalaya was warm-morst during most of the Holocene, whlch was Interrupted by short phases of colder and drier climate around 8 3-7 3 ka B P, 6˜ ˜3 ka B P and 850 years B P Contemporaneous paleoclimate records From Peninsular India also indicate relatively dry conditions for the last glacial period and comparatively warm-moist conditions for a major part of the Holocene The interstadial phases within the last glacial period in the Trans-Himalayan region might have coincided with the enhanced Western disturbance/northeast monsoon in the Indian subcontinent.Keywords
Palynology, Palaeoclimate, Western Himalaya, Monsoon, Western disturbance, Spatio-Temporal climate change.
- Feasibility of Tree-Ring Data in Palaeoseismic Dating in Northeast Himalaya
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53-University Road, Lucknow - 226007, IN
2 Birbal Sahni Institute of Palaeobotany, 53-University Road Lucknow - 226007, IN
3 Department of Science and Technology, New Mehrauli Road, New Delhi - 110 016, IN
1 Birbal Sahni Institute of Palaeobotany, 53-University Road, Lucknow - 226007, IN
2 Birbal Sahni Institute of Palaeobotany, 53-University Road Lucknow - 226007, IN
3 Department of Science and Technology, New Mehrauli Road, New Delhi - 110 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 3 (2008), Pagination: 419-424Abstract
Tree-rings are good proxy records for dating Paleoseismic events. In a reconnaissance tree-ring analyses in the Northeast Himalayan region we find that several conifers of this region are suitable for the various aspect of dendroecological analysis. In this paper we have discussed the feasibility of tree-ring width data of Abies densa growing at two distantly located sites of North-East Himalaya, Yumthang in Sikkim and T-Gompa in Arunachal Pradesh, towards dating Paleoseismic events. We have recorded that growths (ring-widths) are low either during the same year of known high intensity earthquakes of this region or subsequent year when it occurred during non-growing season of the tree. This implies that dated tree-ring sequences could be a promising tool in dating Paleoseismic events of the Northeast Himalaya. Since lower tree growth also noted in several non earthquake years, so for precision in application of tree ring in paleoseismic dating several tree-ring features other than ring width need to be considered along with proper selection of sites and trees preferably trees confine along the fault zones.Keywords
Earthquakes, Tree-Rings, Growth Suppression, Reaction Wood, Paleoseismic Events, NE India.- Tree-Ring Analysis of Sub-Fossil Woods of Pinus wallichiana from Ziro Valley, Arunachal Pradesh, Northeast Himalaya
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow- 226 007, IN
2 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow- 226 007
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow- 226 007, IN
2 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow- 226 007
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 4 (2009), Pagination: 503-508Abstract
We report here a prospect of making a long tree-ring chronology from sub-fossil woods of Pinus wallichiana (PIWA) collected from Ziro valley, Arunachal Pradesh, Northeast Himalaya. Based on counting and measurement of ring-width from several sub-fossil wood pieces, and by cross dating, two floating tree-ring chronologies of PIWA covering time span of 331 and 83 years have been prepared. Two C-14 dates of 300 ± 130 BP (calibrated age: AD 1444-1676) and 1420 ± 110 BP (calibrated age: AD 530-720) derived from the inner most rings of two woods are utilized towards reconstruction of absolute chronology. These dates of sub-fossil woods one each as a component of long and short floating chronologies suggest that millennium year long tree-ring chronology can be proposed from this region.Keywords
Sub-Fossil Wood, Floating Chronology, Ziro Valley, Arunachal Pradesh.References
- BHATTACHARYYA, A. and CHAUDHARY, V. (2003) Late-summer temperature reconstruction of the Eastern Himalayan Region based on tree-ring data of Abies densa. Arct. Antarct. Alp. Res., v.35(2), pp.196-202.
- BHATTACHARYYA, A. and YADAV, R.R. (1996) Dendrochronological reconnaissance of Pinus wallichiana to study glacial behaviour in the western Himalaya. Curr. Sci., v.70 (8), pp.739-744.
- BHATTACHARYYA, A. LAMARCHE, JR. V.C. and TELEWSKI, F.W. (1988) Dendrochronological reconnaissance of the conifers of northwest India. Tree-Ring Bull., v.48, pp.21- 30.
- BHATTACHARYYA, A., SHAH, SANTOSH, K. and CHAUDHARY, V. (2006) Would tree-ring data of Betula utilis be potential for the analysis of Himalayan Glacial fluctuations? Curr. Sci., v.91(6), pp.754-761.
- BHATTACHARYYA, A., YADAV, R.R., BORGAONKAR, H.P. and PANT, G.B. (1992) Growth-ring analysis of Indian tropical trees: dendroclimatic potential. Curr. Sci., v.62(11), pp.736-741.
- BORGAONKAR, H.P., PANT, G.P. and RUPA KUMAR, K. (1996) Ringwidth variations in Cedrus deodara and its climatic response over the western Himalaya. Int. Jour. Climatol., v.16, pp.1409-1422.
- BUCKLEY, B.M., COOK, B.I., BHATTACHRYYA, A., DUKPA, D. and CHAUDHARY, V. (2005) Global surface temperature signals in pine ring width chronologies form southern monsoon Asia. Geophys. Res. Lett., v.32, L20704.
- CHAUDHARY, V., BHATTACHARYYA, A. and YADAV, R.R. (1999) Treering studies in the Eastern Himalayan region: Prospects and problems. IAWA, v.20(3), pp.317-324.
- GRISSINO-MAYER, H.D. (2001) Evaluating crossdating accuracy: A manual and tutorial for the computer program COFECHA. Tree-Ring Res., v.57(2), pp.205-221.
- GRUDD, H., BRIFFA, K.R., KARLEN, W., BARTHOLIN, T.S., JONES, P.D. and KROMER, B. (2002) A 7400-year tree-ring chronology in northern Swedish Lapland: natural climatic variability expressed on annual to millennial timescales. The Holocene, v.12(6), pp.657-665.
- GUNNARSON, B.E. and LINDERHOLM, H.W. (2002) Low-frequency summer temperature variation in central Sweden since the tenth century inferred from tree rings. The Holocene, v.12(6), pp.667-671.
- HELAMA, S., LINDHOLM, M., TIMONEN, M., MERILAINEN, J. and ERONEN, M. (2002) The supra-long Scots pine tree-ring record for Finnish Lapland: Part 2, interannual to centennial variability in summer temperatures for 7500 years. The Holocene, v.12(6), pp.681-687.
- HOLMES, R.L. (1983) Computer assisted quality control in tree ring dating and measuring. Tree Ring Bull., v.43, pp.69-78.
- HUGHES, M. K. (1992) Dendroclimatic evidence from the Western Himalaya. In: R.S. Bradley and P.D. Jones (Eds.), Climate since AD 1500. Routledge, London, pp.415-431.
- LARA, A. and VILLALBA, R. (1993) A 3620-year temperature record from Fitzroya cupressoides tree rings in southern South America. Science, v.260, pp.1104- 1106.
- LEUSCHNER, H.H., SASS-KLAASSEN, U., JANSMA, E., BAILLIE, M.G.L. and SPURK, M. (2002) Subfossil European bog oaks: population dynamics and long-term growth depressions as indicators of changes in the Holocene hydro-regime and climate. The Holocene, v.12(6), pp.695-706.
- NAURZBAEV, M.M., VAGANOV, E.A., SIDOROVA, O.V. and SCHWEINGRUBER, F.H. (2002) Summer temperatures in eastern Taimyr inferred from a 2427-year late-Holocene tree-ring chronology and earlier floating series. The Holocene, v.12(6), pp.727-736.
- SHAH, SANTOSH. K., BHATTACHARYYA, A. and CHAUDHARY, V. (2007) Reconstruction of June-September Precipitation based on tree-ring data of Teak (Tectona grandis L.) from Hoshangabad, Madhya Pradesh, India. Dendrochronologia, v.25, pp.57-64.
- SHAH, SANTOSH. K., BHATTACHARYYA, A. and CHAUDHARY, V. (2009) Climatic influence on radial growth of Pinus wallichiana in Ziro valley, Northeast Himalaya. Curr. Sci., v.95(5), pp.697- 702.
- SPURK, M., LEUSCHNER, H.H., BAILLIE, M.G.L., BRIFFA, K.R. and FRIEDRICH, M. (2002) Depositional frequency of German subfossil oaks: climatically and non-climatically induced fluctuations in the Holocene. The Holocene, v.12(6), pp.707- 715.
- STOKES, M.A. and SMILEY, T.L. (1968) An Introduction to Tree- Ring Dating. Univ. of Chicago Press, Chicago, IL, pp.73.
- STUIVER, M., REIMER, P.J., BARD, E., BECK, J.W., BURR, G.S., HUGHEN, K.A., KROMER, B., MCCORMAC, G., VAN DER PLICHT, J. and SPURK, M. (1998) Intcal 98 radiocarbon age calibration, 24 000– 0 cal BP. Radiocarbon, v.40, pp.1041-1083.
- YADAV, R.R., PARK, W.-K. and BHATTACHARYYA, A. (1999) Springtemperature variations in western Himalaya, India, as reconstructed from tree-rings: AD 1390-1987. The Holocene, v.9(1), pp.85-90.
- Holocene Palaeoclimate and Glacier Fluctuations within Baspa Valley, Kinnaur, Himachal Pradesh
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 3 (2010), Pagination: 527-532Abstract
Present study is an attempt to understand the tree line shift in relation to glacier fluctuations during Holocene based on the exploratory palynological studies from a 1.3 m deep sediment profile located at 3,100 meters above mean sea level (mamsl), Rukti valley, Kinnaur, Himachal Pradesh. The study reveals that during the early to middle Holocene, tree line taxa viz. Betula and Juniperus were well characterized in the site of investigation evident by higher percentage of their pollen grains in subsurface sediments than those recorded during the late Holocene. This variation in distribution of these taxa suggests that till middle Holocene tree line was close to the study site (3,100 mamsl) i.e. at lower altitude than its present day distribution between 3,800 to 3,900 mamsl. Accordingly, the glacier snout might also be at lower elevations (∼3,500 mamsl) than its present day location at altitude (∼4,300 mamsl).Keywords
Palynology, Palaeoclimate, Holocene, Glacier Extent, Baspa Valley, Himachal Pradesh.- Holocene Vegetation and Climate of South Tripura Based on Palynological Analysis
Abstract Views :201 |
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, Lucknow - 226 006, IN
2 Department of Geology, Kent State University, Ohio - 44240, US
1 Birbal Sahni Institute of Palaeobotany, Lucknow - 226 006, IN
2 Department of Geology, Kent State University, Ohio - 44240, US
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 6 (2011), Pagination: 521-526Abstract
Palynological analysis of sub surface samples at 1.20 m deep sediment profile from Srinagar, southwest Tripura, provides information on vegetation and climate during 7000-3000 years B.P. During this time span, the area is occupied by moist deciduous forest under warm humid climate with intermittent changes in precipitation regime i.e., comparatively less humid around 6.8 Kyr B.P. and 3.7-3.8 Kyr B.P.Keywords
Palynology, Holocene, Vegetation, Climate and Tripura.- Reconnaissance of Quaternary Sediments from Khasi Hills, Meghalaya
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Authors
Affiliations
1 Institute of Geography and Spatial Organization, Polish Academy of Sciences, Jana 22, 31-018 Krakow, PL
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow-226 007, IN
1 Institute of Geography and Spatial Organization, Polish Academy of Sciences, Jana 22, 31-018 Krakow, PL
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow-226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 3 (2011), Pagination: 258-262Abstract
Khasi Hills area of Meghalaya, one of the highest rainfall zones of the world has been explored to understand the spatial and temporal extent of Quaternary sediments. In general such deposits are restricted to shallow depths in most of the sites except in one site where it is 600 cm thick. AMS C-14 dates of these deposits suggest that sediments deposited are mostly of Holocene or in rare cases belong to later part of Pleistocene. Early Quaternary deposit is either missing or yet to be explored from this region. Natural hazards combined with human activity effecting degradation of vegetation and sediment cover are probably the main cause for poor Quaternary exposure at the region.Keywords
Khasi Hills, Quaternary Sediments, Radiocarbon, Cesium Dating.References
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- BRADLEY, R.S. (1999) Paleoclimate: reconstructing climate of the Quaternary (second edition), Academic Press, Internat. Geophys. Series, v.68, pp.613.
- GSI (1974) Geology and mineral resources of the states of India, part IV, Meghalaya. Geol. Surv. India, Misc. Publ., no.30, pp.69-90.
- MAZUMDAR, S.K. (1986) The Precambrian framework of part of the Khasi Hills, Meghalaya. Rec. Geol. Surv. India, v.117, pt.2, pp.1-59.
- OLDHAM, R.D. (1899) Report on the Great Earthquake of 12th June 1897. Mem. Geol. Surv. India, v.30, Calcutta.
- RAMAKRISHNAN, P.S. (1992) Shifting Agriculture and Sustainable Development: An Interdisciplinary Study from North-Eastern India. UNESCO-MAB Series, Parthenon Publications, Paris.
- ROY, P.S. and JOSHI, P.K. (2002) Forest cover assessment in northeast India - the potential of temporal wide swath satellite sensor data (IRS-1C WiFS). Internat. Jour. Remote Sensing, v.23(2), pp.4881-4896.
- ROY, P.S. and TOMAR, S. (2001) Biodiversity characterization at landscape level using geospatial modelling technique. Biological Conservation, v.95, pp.95-109.
- SINGH, R.S. (2005) Soil Series of Meghalaya. Technical Bulletin, 121, NBSS&LUP, Nagpur.
- SOJA, R. and STARKEL, L. (2007) Extreme rainfalls in Eastern Himalaya and southern slope of Meghalaya Plateau and their geomorphologic impacts. Geomorphology, v.84, pp.170-180.
- SUKHIJA, B.S., RAO, M.N., REDDY, D.V., NAGABHUSHANAM, P., HUSSAIN, S., CHADHA, R.K. and GUPTA, H.K. (1999) Timing and return period of major paleoseismic events in the Shillong Plateau, India. Tectonophysics, v.308, pp.53-65.