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):

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

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

3. 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

4. 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.

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

References:

References are not available for this document.

Citations

Citations are not available for this document.

Citations

Downloads

Views