Refine your search
Collections
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Shah, Santosh K.
- Temporal and Spatial Variations of Late Pleistocene-Holocene Climate of the Western Himalaya Based on Pollen Records and their Implications to Monsoon Dynamics
Abstract Views :169 |
PDF Views:2
Authors
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
Abstract Views :199 |
PDF Views:2
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
Abstract Views :170 |
PDF Views:0
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 Vegetation and Climate of South Tripura Based on Palynological Analysis
Abstract Views :202 |
PDF Views:0
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