low Indian reconstructed Herbert2010
ODP-117-722
Elevation:-2033.5
Archive:marine sediments (downcore)
Proxy measurement:SST alkenones
Sampling resolution:millennial
Startyear:5069.892 ka BP
Endyear:1.290 ka BP
Description:Determining the timing and amplitude of tropical sea surface temperature (SST) change is an important part of solving the puzzle of the Plio-Pleistocene ice ages. Alkenone-based tropical SST records from the major ocean basins show coherent glacial- interglacial temperature changes of 1° to 3°C that align with (but slightly lead) global changes in ice volume and deep ocean temperature over the past 3.5 million years. Tropical temperatures became tightly coupled with benthic d18O and orbital forcing after 2.7 million years. We interpret the similarity of tropical SST changes, in dynamically dissimilar regions, to reflect "top-down"" forcing through the atmosphere. The inception of a strong carbon dioxide-greenhouse gas feedback and amplification of orbital forcing at ~2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time."
Data entered by name:Martrat, Belen
Data entered by email:This email address is being protected from spambots. You need JavaScript enabled to view it.
Main reference(s):Herbert, T. D., Peterson, L. C., Lawrence, K. T. & Liu, Z. Tropical Ocean Temperatures Over the Past 3.5 Million Years. Science 328, 1530-1534, doi:10.1126/science.1185435 (2010).Lang, N. & Wolff, E. W. Interglacial and glacial variability from the last 800 ka in marine, ice and terrestrial archives. Clim. Past 7, 361-380, doi:10.5194/cp-7-361-2011 (2011).
Link to reference 1:http://www.sciencemag.org/content/328/5985/1530.abstract
Link to reference 2:http://www.clim-past.net/7/361/2011/
Data storage link 1:https://www.ncdc.noaa.gov/paleo-search/study/10493
Data storage link 2:http://www.clim-past.net/7/361/2011/
Comments:woa09t_an0: 26.650000 ºC
Current dating method:-- select --
Annual snow acc rate:-- select --