Affiliation:
1. 1 Environment Research Institute Shandong University Qingdao 266237 China sdu.edu.cn
2. 2 Key Laboratory of Marine Geology and Metallogeny First Institute of Oceanography Ministry of Natural Resources Qingdao 266061 China mnr.gov.cn
3. 3 Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266061 China qnlm.ac
4. 4 V.I. Il’ichev Pacific Oceanological Institute Far East Branch of the Russian Academy of Sciences Vladivostok Russia
Abstract
Abstract
Wildfire is an integral part of the Earth’s climate system and plays an important role in shaping terrestrial ecosystems and biodiversity, atmospheric chemistry, regional climate, and the carbon cycle in the Earth’s history. However, the lack of high-resolution records of long wildfires limits our understanding of the natural variability, long-term trends of wildfire activity, and the reasons behind the changes in wildfire on orbital timescales. Here, a 320 ka long high-resolution wildfire record from the subarctic North Pacific is reconstructed with black carbon (BC), including its two subtypes char and soot. A 7-day-long back trajectory simulation analysis reveals the higher frequency of trajectories comes from Siberia. Our data show that continuous incidence of wildfire on a continental scale over the last 320 ka was higher during glacial periods than during the interglacial periods. The increase in wildfire frequency during glacial periods is ascribed to less precipitation. Contrasting patterns of wildfire incidence between marine isotope stages 2 and 6 may be ascribed to different fuel availability, which is related to contrasting configurations of the Northern Hemisphere ice sheet between glacial periods. A significant periodicity of 23 ka of our wildfire record suggests the precession of the Earth’s orbit pace wildfire development. The tight coupling of intensified wildfire and enhanced nutrient utilization efficiency suggests a nontrivial role of fire in the climate system.
Funder
Taishan Scholar Foundation of Shandong Province
Basic Scientific Fund for National Public Research Institutes of China
Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology
Reference67 articles.
1. Fire in the earth system;Bowman;Science,2009
2. Biological and geophysical feedbacks with fire in the earth system;Archibald;Environmental Research Letters,2018
3. Asian inland wildfires driven by glacial-interglacial climate change;Han;Proceedings of the National Academy of Sciences of the United States of America,2020
4. Fire regimes during the last glacial;Daniau;Quaternary Science Reviews,2010
5. Contingent Pacific-Atlantic Ocean influence on multicentury wildfire synchrony over western North America;Kitzberger;Proceedings of the National Academy of Sciences of the United States of America,2007
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献