Climatic reconstruction vis-à-vis Glacier studies during Quaternary, from the Himalayan and Trans-Himalayan regions, using multi-proxy data viz. Palynology, Environmental magnetism and stable isotopes, on the subsurface sediments from various geomorphological features including extinct and extant lakes.
Palaeoclimatic reconstruction and Biostratigraphy of the Tertiary Formations of western Kutch, Gujarat, using palynology and other proxy data.
Graduation (B.Sc.) in Geology, Botany and Zoology from BSNV Degree College (Lucknow University), Lucknow in 1995.
Post graduation (M.Sc.) in Geology from Lucknow University, Lucknow in 1997.
Ph.D Degree in Geology, from Lucknow University and Birbal Sahni Institute of Palaeobotany, Lucknow; Awarded in 2007. Title of thesis is “Vegetational and Climatic changes in the Himalayan and Trans-Himalayan region since late Pleistocene”.
Ranhotra, P. S., Bhattacharyya, A., Kar, Ratan and Sekar, B. (2001). Vegetation and climatic changes around Gangotri glacier during Holocene. Geological Survey of India special publication, v.65(III), pp 67-71.
Bali, R., Yudhbir, Sharma, A. K. and Ranhotra,P. S. (2001). Landslide hazard microzonation of Tawaghat-Sobla area, Kumaun Himalaya. Proceedings, Aspects of Geology and Environment of the Himalaya, Kumaon University Nainital, pp 199-218.
Kar, R., Ranhotra, P. S., Bhattacharyya, A. and Sekar, B. (2002). Vegetation vis-à-vis climate and glacial fluctuations of the Gangotri glacier since last 2000 years. Current Science, v.82, pp 347-351.
Bhattacharyya, A. and Ranhotra, P. S. (2003). Late Holocene vegetation and climatic changes around Tapoban, Gangotri glacier, Garhwal Himalaya. Proceedings of the International PAGES workshop and training program, French Institute, Pondicherry, v.42, pp 243-246.
Ranhotra, P. S. and Bhattacharyya, A. (2004). Vegetation, Climate and Lake History of Tapoban, Gangotri Glacier, Garhwal Himalaya, Geological Survey of India special publication, v.80, pp 215-221.
Chakraborty, S., Bhattacharyya, S. K., Ranhotra P. S., Bhattacharyya A. and Bhushan, R. (2006). Palaeoclimatic Scenario during Holocene around Sangla valley, Kinnaur, North-west Himalaya, based on multiproxy records. Current Science, v.91, pp 777-782.
Bhattacharyya, A., Ranhotra P. S. and Shah, S. K. (2006). Temporal and spatial aspects of Western Himalayan climate and their implication to Monsoon dynamics. Journal Geological Society of India, v.68, pp 507-515.
Bhattacharyya A., Ranhotra P. S., Ganjoo, R. K. and Koul, M. N. (2006). The early Holocene vegetation and climate in Naradu Glacier Valley of Kinnaur District, Himachal Pradesh. Palaeobotanist, v.55, pp 89-96.
Ranhotra, P. S., Bhattacharyya, A. and Kotlia B. S. (2007). Vegetation and climatic changes around Lamayuru, Trans-Himalaya during the last 35 ky B.P. Palaeobotanist, v.56, pp 117-126.
Saxena, R. K. and Ranhotra, P. S. (2009). Palynofloral Study of the Intertrappean Bed Exposed at a New Locality in Kutch District, Gujarat and its Implications on Palaeoenvironment and Age. Journal Geological Society of India, v.74, pp 690-696.
Ranhotra, P. S. and Bhattacharyya, A. (2010). Holocene Palaeoclimate and Glacier Fluctuations within Baspa Valley, Kinnaur, Himachal Pradesh. Journal Geological Society of India, v.75, pp 527-532.
Ranhotra,P. S. and Kar Ratan (2011). Palynological study of glacio-geomorphic features and its relevance to Quaternary palaeoclimate and glacial history. Current Science, v.100, pp 641-647.
Bhattacharyya, A., Ranhotra, P. S. and Gergan, J. T. (2011). Vegetation vis-à-vis Climate & Glacier history during 12,400 to 5,400 yr BP from Dokriani valley, Garhwal Himalaya, India. Journal Geological Society of India, v.77, pp 401-408.
Bhattacharyya, A., Ranhotra, P. S. and Shah, S. K. (2011). Spatio-Temporal Variation of Alpine Vegetation vis-à-vis Climate during Holocene in the Himalaya. Memoir, Geological Society of India No. 77, ISBN: 978-81-907636-2-2, pp. 309-319.
Saxena, R. K., Srivastava, A. K. & Ranhotra, P. S. (2012). First record of mites (Acarina) from the Palaeogenesediments of Kutch, western India, with comments on palaeoenvironment: support from palynological evidence. Geophytology, v.42, pp 1-10.
Ranhotra, P. S. and Bhattacharyya, A. (Accepted). Modern Vegetational Distribution and Pollen Dispersal Study within Gangotri Glacier Valley, Garhwal Himalaya. Journal Geological Society of India.
Senior Research Fellowship, through CSIR, New Delhi, January 2003 till March 2004.
Birbal Sahni Research Associate fellowship (BSRA), 29th March 2007 till 14th September 2008 at Birbal Sahni Institute of Palaeobotany, Lucknow.
INSA Bilateral Exchange fellowship (2013) to work on palaeoclimatic reconstruction of Central Himalaya, Nepal.
Under the project on Quaternary palaeoclimatic studies of Arctic region at BSIP, Lucknow, visits to Ny-Alesund, Svalbard, Norway (On deputation through MOES, New Delhi and NCAOR, Goa) during third (August 2009), fourth (July 2010) and fifth (July-August 2011) Arctic Expeditions.
On invitation, attended the IGBP-PAGES Workshop on “Holocene land-cover change in Eastern Asia for climate modelling” A contribution to PAGES Focus 4, Theme Land use and Land cover (LULC) at Hebei Normal University, Shijiahzuang, China, October 9th-11th 2012.
Invited to attend scientific discussions on monsoonal lakes and palaeoclimatic reconstruction using spores and pollen at Senckenberg Research Institute, Weimar, Germany, 9th to 15th December 2012.
Fifth Glaciology Training Course, 21st August to 17th September 2000, at Geological Survey of India, Lucknow, (UP) and Hamtah Glacier, Lahaul and Spiti District, Himachal Pradesh, India. Organized by the GSI and sponsored by the Department of Science and Technology, New Delhi.
Training on Palaeoclimatic Methods, 14th May to 19th May 2001, at Indian Institute of Tropical Meteorology, Pune, sponsored by PAGES.
Workshop and training program, on Palaeoclimatic Methods (POLTRAIN) from 14th to 19th February 2003, at French Institute of Palynology, Pondicherry sponsored by PAGES.
Training program on “Late Cenozoic Dinoflagellate Cystes” by Prof. Martin James Head, of Department of Earth Sciences, Brock University, St. Catharines, Canada, at BSIP, Lucknow during 14th to 26th January 2011.
“Vegetational and Climatic changes in the Himalayan and Trans-Himalayan region during late Pleistocene” at BSIP, Lucknow, during in-house lecture series in June 2007.
“Vegetational and Climatic changes in the Himalayan and Trans-Himalayan region during late Pleistocene” at French Institute of Pondicherry (IFP), Pondicherry in January 2008.
“Vegetational and Climatic changes in the Himalayan and Trans-Himalayan region during late Pleistocene” and “Glimpses of Arctic expedition 2009 and 2010” at Department of Botany, Madras Christian College, Chennai on 4th January 2011.