Tree ring derived summer temperature variability over the past millennium in the western himalayas, northern Pakistan | Abstract Book on Second International Conference on Recent Approaches in Plant Sciences (RAPS-23) 4-5 May 2023 2023

Author(s)

Fayaz Asad Department of Botany, Bacha Khan University Charsadda, KP, Pakistan

Naveen Dilawar Department of Botany, Abdul Wali Khan University Mardan KP, Pakistan

Haifeng Zhu Key Laboratory of Alpine Ecology, Institute of Tibetan, Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; CAS Center for Excellence in Tibetan Plateau Earth, Sciences, Beijing , China

Mukund Palat Rao Department of Plant Science, University of California Davis (UC Davis), California, USA; Tree Ring Laboratory, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA; Department of Earth and Environmental Science, Columbia, University, New York, NY 10027, USA

Abstract

High-altitude Himalayan regions of Pakistan are significantly impacted by global warming, particularly because of soil erosion and glaciers that are melting rapidly. Deciphering long-term temperature variations (past millennium) and potential long-term temperature trends is of great importance for future predictions of regional temperature change in the Western Himalayas, northern Pakistan (WHNP). In this work, we reconstructed June-July (summer) mean temperatures by using tree-ring width of Juniperus excelsa for the WHNP dated back to 1086 using a substantial negative correlation between the summer temperature and standard tree ring-width chronology. According to statistical validation, the reconstruction accounted for 41.6% of the climatic variation for the period of C. E. 1956-2013 instrumental period. There have been four extremely warm summer periods (= 4 years) of 1276-1279, 1640-1659, 17051710, and 1761-1764 C. E. and seven cold summer periods of 1154-1158, 1258-1264, 1469-1472, 1595-1600, 1952-1958, 1797-1803 and 1952-1958 C. E. observed during the past 928 years. Individual extreme-warm periods occurred in C. E. 1093 (29.42°C) and extreme cold periods in C. E. 1088 (26.99°C). However, our reconstruction has not detected the recent global warming trends. A comparison with observed data and regional temperature reconstruction series shows that the reconstruction has a high degree of consistency, indicating a high degree of confidence in the reliability of the reconstruction. This confirmed that the reconstruction had a robust regional temperature signal for the WHNP, and could be a highly valuable data for studying a long term climate trend in the western Himalaya.

Publication Details

Page(s) 181-181

DOI DOI not available

Published Journal: Abstract Book on Second International Conference on Recent Approaches in Plant Sciences (RAPS-23) 4-5 May 2023 , Volume: 0, Issue: 0, Year: 2023

Keywords

reconstruction western Juniperus excelsa dendrochronology Tree rings

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