caa a22 4500 605474893 CHVBK 20210128100349.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00382-014-2162-0 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2162-0 Tropical Pacific response to continental ice sheet topography [Elektronische Daten] [Shih-Yu Lee, John Chiang, Ping Chang] The last glacial maximum was marked by maximum land ice extent and lowest greenhouse gases concentration during the last ice age. We explore the impact of glacial continental ice sheet topography on the large-scale tropical ocean-atmosphere climate, in particular the tropical Pacific, in an intermediate complexity coupled model. Increasing the thickness of continental ice sheets causes a southward displaced Pacific Intertropical Convergence Zone (ITCZ) and a strengthening (weakening) of northern (southern) hemisphere winter Hadley cell. The equatorial zonal sea surface temperature gradient weakened with an increased continental ice sheets thickness, the reduction being caused by cooling in the western equatorial Pacific and warming in the eastern equatorial Pacific. The evolution of the tropical climate with changing ice thickness has distinct quasi-linear and nonlinear parts. While the linear part is a direct response to the ice topographic changes, the nonlinear part was a result of the tropical thermocline adjustment. Our analysis of a fully-coupled transient deglacial simulation strongly indicates the dominant role of ice sheet topography in determining the deglacial evolution of the simulated Pacific climate. The thickness of continental ice sheet, separate from ice albedo effect, has significant impact on the tropical ocean-atmosphere climate in particular with the meridional displacement in the Pacific ITCZ. The altered circulation states seen in the model may aid understanding of the relationship between tropical and high-latitude climate records in glacial-interglacial cycles. Springer-Verlag Berlin Heidelberg, 2014 Last glacial maximum nationallicence Ice sheet topography nationallicence Tropical Pacific thermal gradient nationallicence General circulation model nationallicence Lee Shih-Yu Research Institute for Environmental Changes, Academia Sinica, 128 Academia Rd. Sec. 2, Nankang, Taipei, Taiwan aut Chiang John Department of Geography and Berkeley Atmospheric Sciences Center, University of California, Berkeley, CA, USA aut Chang Ping Department of Oceanography, Texas A&M University, College Station, TX, USA aut Climate Dynamics Springer Berlin Heidelberg 44/9-10(2015-05-01), 2429-2446 0930-7575 44:9-10<2429 2015 44 382 https://doi.org/10.1007/s00382-014-2162-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2162-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Shih-Yu Research Institute for Environmental Changes, Academia Sinica, 128 Academia Rd. Sec. 2, Nankang, Taipei, Taiwan aut NATIONALLICENCE 700 1- Chiang John Department of Geography and Berkeley Atmospheric Sciences Center, University of California, Berkeley, CA, USA aut NATIONALLICENCE 700 1- Chang Ping Department of Oceanography, Texas A&M University, College Station, TX, USA aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/9-10(2015-05-01), 2429-2446 0930-7575 44:9-10<2429 2015 44 382