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Subantarctic sea surface temperatures and salinity change

Originator:

Mashiotta, T.A.; Lea, D.W.; Spero, H.J.

Citation Information:

Mashiotta, T.A., D.W. Lea, and H.J. Spero. 1999. Glacial-interglacial changes in Subantarctic sea surface temperature and d18O-water using foraminiferal Mg. Earth and Planetary Science Letters, 170(4), 417-432. doi: 10.1016/S0012-821X(99)00116-8
Lat:0, Lon:0

Download Data:

Data Files for All Sites
Original Data and Full Metadatamashiotta1999
E11-2
Alternate Format Datae11-2m-tab.txt
RC11-120
Alternate Format Datarc11120m-tab.txt

Use Constraints:

Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.

Distributor:

National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce

Resource Description (data set id):

noaa-ocean-2542

Data Coverage:

Southernmost Latitude: -56.07
Northernmost Latitude: -43.52
Westernmost Longitude: -115.1
Easternmost Longitude: 79.87
Minimum Elevation: -3193 m
Maximum Elevation: -3111 m
Earliest Year: 293700 cal yr BP (-291750 CE)
Most Recent Year: 2700 cal yr BP (-750 CE)

Science Keywords:

Sea Surface Temperature Reconstruction
Other Hydroclimate Reconstruction

Parameters:

earth science>paleoclimate>paleocean>oxygen isotopes
earth science>paleoclimate>paleocean>age control
earth science>paleoclimate>paleocean>reconstruction
earth science>paleoclimate>paleocean>trace metals in carbonates

Summary/Abstract:

Laboratory culturing experiments with living Globigerina bulloides indicate that Mg/Ca is primarily a function of seawater temperature and suggest that Mg/Ca of fossil specimens is an effective paleotemperature proxy. Using culturing results and a core-top Neogloboquadrina pachyderma calibration, we have estimated glacial–interglacial changes in sea surface temperature (SST) using planktonic Mg/Ca records from core RC11-120 in the Subantarctic Indian Ocean (43°S, 80°E) and core E11-2 in the Subantarctic Pacific Ocean (56°S, 115°W). Our results suggest that glacial SST was about 4°C cooler in the Subantarctic Indian Ocean and 2.5°C cooler in the Subantarctic Pacific. Comparison of SST and planktonic δ18O records indicates that changes in SST lead changes in δ18O by on average 1–3 kyr. The glacial–interglacial temperature change indicated by the Subantarctic Mg/Ca records suggests that temperature accounts for 40–60% of the foraminiferal δ18O change. We have used the Mg/Ca-based SST estimates and δ18O determinations to generate site-specific seawater δ18O records, which suggest that seawater δ18O was on average 1‰ more positive during glacial episodes compared with interglacial episodes.

More Information:

Contact Information:

DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
325 Broadway, E/NE31
Boulder, CO 80305-3328
USA