1An investigation of rapid warm transitions during MIS2 and MIS3 using Greenland ice-core data and the CLIMBER-2 model

• Main Authors: I. A. Mogensen, Sigfus J. Johnsen, A. Ganopolski, S. Rahmstorf
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Greenland; Dansgaard-Oeschger events; Greenland ice core; GRIP; ice core; Ice Sheet
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.1397; http://www.pik-potsdam.de/%7Estefan/Publications/Journals/mogensen2002.pdf

In the search for a better understanding of the dominant mechanisms of the Earth's climate system, we present a study of the rapid warm climate transitions into the Dansgaard-Oeschger events as seen in the ice-cores from the Greenland Ice Sheet. We present a continuous δ18O-record from the GRIP core with a resolution of 5 yrs until 50 kyrs BP and 20 yrs until 100 kyrs BP. These data are compared with other high-resolution records, i.e. the GISP2 chemistry-record (25 yrs until 50 kyrs BP) and the GRIP Ca2+-record (3 yrs until 100 kyrs BP). All records have been transformed to the GISP2 Meese/Sowers time scale. The high-resolution records are separated into interstadials and stadials, defined by the GRIP and GISP2 δ18O records. We examine in detail the transitions into the Dansgaard-Oeschger events, and propose a scenario for the changes taking place in the different ice core records during the approximately 50 yrs the transitions takes. The main difference from previous studies is in the much higher resolution data sets available until 50 kyrs BP; previous high-resolution studies by (Taylor and others, 1997) have focused on only the YD/PB transition. 2The data are compared to model simulations of the Dansgaard-Oeschger events performed with the CLIMBER-2 model of intermediate complexity (Ganopolski and Rahmstorf, 2001; Petoukhov and others, 1998).