Stability of the East Asian climate during the past warm periods

2010 Fiscal Year Final Research Report

• Project/Area Number: 19710026
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Environmental dynamic analysis
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: NAGASHIMA Kana Japan Agency for Marine-Earth Science and Technology, 地球環境変動領域, 研究員 (90426289)
• Project Period (FY): 2007 – 2010
• Keywords: 気候変動 / 地球温暖化 / アジアモンスーン / 古気候 / 古海洋 / 偏西風 / ESR

Research Abstract

Reconstructed provenances of eolian dust in Japan Sea sediments exhibit millennial-scale variations during MIS 1 and 5, which we interpret to reflect changes in the timing of the seasonal northward movement of the westerly jet axis. The westerly jet changes probably cause millennial-scale changes for the latitudinal distribution of the East Asian Summer Monsoon precipitation. The coupled changes represent climate instability in East Asia during past warm periods.

Research Products

• [Journal Article] Millennial-scale oscillations of the westerly jet path during the last glacial period. (2011)
  • Author(s): Kana Nagashima, Ryuji Tada, Atsushi Tani, Youbin Sun, Yuko Isozaki, Shin Toyoda, Hitoshi Hasegawa.
  • Journal Title: Journal of Asian Earth Sciences. Vol.40 Pages: 1214-1220
  • Peer Reviewed
• [Journal Article] Provenance study of the Asian dust based on crystallinity and electron spin resonance signal intensity of quartz. (2010)
  • Author(s): Kana Nagashima, Ryuji Tada, Shin Toyoda.
  • Journal Title: Proceedings of the Eleventh Workshop on Environmental Radioactivity Vo.11 Pages: 10-18
  • Peer Reviewed
• [Presentation] Abrupt changes of the Asian dust flux and provenance recorded in ocean and lake sediments around Japan. (2010)
  • Author(s): Kana Nagashima
  • Organizer: PMIP3 workshop
  • Place of Presentation: Kyoto Garden Palace Hotel, Japan
  • Year and Date: 2010-12-09
• [Presentation] Millennial-scale oscillations in westerly jet path and their linkage with East Asian monsoon. (2010)
  • Author(s): Kana Nagashima
  • Organizer: 2010 Kochi International Workshop on Paleo, Rock and Environmental Magnetism - Asian Monsoon and Global Climate Change
  • Place of Presentation: Kochi University, Japan
  • Year and Date: 2010-02-04
• [Presentation] Millennial-scale oscillations in westerly jet path and theirlinkage with East Asian monsoon (2009)
  • Author(s): Kana Nagashima
  • Organizer: PAGES 3rd Open Science Meeting
  • Place of Presentation: Oregon State University, USA
  • Year and Date: 2009-07-10
• [Presentation] Westerly jet-Asian Monsoon coupling during the last 30 kyr. (2008)
  • Author(s): Kana Nagashima
  • Organizer: 2008 American Geophysical Union Fall Meeting
  • Place of Presentation: The Moscone Center, San Francisco, USA
  • Year and Date: 2008-12-16
• [Presentation] Coupled variations in Asian winter monsoon and westerly jet during the last 60 kyr recorded in the south-central Japan Sea sediments. (2007)
  • Author(s): Kana Nagashima
  • Organizer: 9^<th> International Conference on Paleoceanography
  • Place of Presentation: Shanghai, China
  • Year and Date: 2007-09-04
• [Remarks] ホームページ等
  • URL: http://www.jamstec.go.jp/seika/jdb/index.do
• [Remarks]
  • URL: http://www.jamstec.go.jp/res/ress/nagashimak/