Regulation of the monsoon climate by two different orbital rhythms and forcing mechanisms

Research Article| June 01, 2008 Regulation of the monsoon climate by two different orbital rhythms and forcing mechanisms Takeshi Nakagawa; Takeshi Nakagawa 1Department of Geography, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK Search for other works by this author on: GSW Google Scholar Masaaki Okuda; Masaaki Okuda 2Natural History Museum and Institute of Chiba, Chiba 260-8682, Japan Search for other works by this author on: GSW Google Scholar Hitoshi Yonenobu; Hitoshi Yonenobu 3College of Education, Naruto University of Education, Naruto 772-8502, Japan Search for other works by this author on: GSW Google Scholar Norio Miyoshi; Norio Miyoshi 4Department of Applied Science, Faculty of Science, Okayama University of Science, Okayama 700-0005, Japan Search for other works by this author on: GSW Google Scholar Toshiyuki Fujiki; Toshiyuki Fujiki 5Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan Search for other works by this author on: GSW Google Scholar Katsuya Gotanda; Katsuya Gotanda 6Faculty of Policy Informatics, Chiba University of Commerce, Chiba 272-8512, Japan Search for other works by this author on: GSW Google Scholar Pavel E. Tarasov; Pavel E. Tarasov 7Institute for Geological Sciences, Freie Universität Berlin, Malteserstrasse 74-100, Haus D, 12249 Berlin, Germany Search for other works by this author on: GSW Google Scholar Yoshimune Morita; Yoshimune Morita 8Botanical Garden, Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan Search for other works by this author on: GSW Google Scholar Keiji Takemura; Keiji Takemura 9Institute for Geothermal Sciences, Faculty of Science, Kyoto University, Beppu 874-0903, Japan Search for other works by this author on: GSW Google Scholar Shoji Horie Shoji Horie 9Institute for Geothermal Sciences, Faculty of Science, Kyoto University, Beppu 874-0903, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Takeshi Nakagawa 1Department of Geography, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK Masaaki Okuda 2Natural History Museum and Institute of Chiba, Chiba 260-8682, Japan Hitoshi Yonenobu 3College of Education, Naruto University of Education, Naruto 772-8502, Japan Norio Miyoshi 4Department of Applied Science, Faculty of Science, Okayama University of Science, Okayama 700-0005, Japan Toshiyuki Fujiki 5Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan Katsuya Gotanda 6Faculty of Policy Informatics, Chiba University of Commerce, Chiba 272-8512, Japan Pavel E. Tarasov 7Institute for Geological Sciences, Freie Universität Berlin, Malteserstrasse 74-100, Haus D, 12249 Berlin, Germany Yoshimune Morita 8Botanical Garden, Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan Keiji Takemura 9Institute for Geothermal Sciences, Faculty of Science, Kyoto University, Beppu 874-0903, Japan Shoji Horie 9Institute for Geothermal Sciences, Faculty of Science, Kyoto University, Beppu 874-0903, Japan Publisher: Geological Society of America Received: 07 Nov 2007 Revision Received: 19 Feb 2008 Accepted: 22 Feb 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2008 Geological Society of America Geology (2008) 36 (6): 491–494. https://doi.org/10.1130/G24586A.1 Article history Received: 07 Nov 2007 Revision Received: 19 Feb 2008 Accepted: 22 Feb 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Takeshi Nakagawa, Masaaki Okuda, Hitoshi Yonenobu, Norio Miyoshi, Toshiyuki Fujiki, Katsuya Gotanda, Pavel E. Tarasov, Yoshimune Morita, Keiji Takemura, Shoji Horie; Regulation of the monsoon climate by two different orbital rhythms and forcing mechanisms. Geology 2008;; 36 (6): 491–494. doi: https://doi.org/10.1130/G24586A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The East Asian monsoon is responsible for transferring huge amounts of heat and moisture between the land and the adjacent ocean. Significant changes in its capacity to do this will have direct impacts on regional climatic gradients and global atmospheric circulation. Determining the mechanisms that force long-term variation in monsoon behavior is therefore important for understanding global climate change. Competing theories vary in the degree of importance attached to glacial forcing, other orbital rhythms, and internal feedback mechanisms as primary drivers of change. There is, however, no convincing explanation as to why different proxy records from closely neighboring regions are tuned to different orbital rhythms. Here we present quantitative climatic reconstructions for the past 450 k.y. based on a long pollen record from Lake Biwa in Japan. The data suggest that continental and oceanic air mass temperatures respond predominantly to the 100 k.y. orbital rhythm, whereas the land-ocean temperature gradient and monsoon vigor oscillate mainly at the 23 k.y. insolation cycle. We suggest that the mechanisms for this behavior lie in the differential response of land and ocean to solar forcing, and conclude that the 100 k.y. signal dominates monsoon intensity only when the amplitude of solar forcing falls below a threshold level. 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