Western Pacific thermocline structure and the Pacific marine Intertropical Convergence Zone during the Last Glacial Maximum

noaa-ocean-17415 Western Pacific Stable Isotope Data Around the Intertropical Convergence Zone during the Last Glacial Maximum Leech, P.J.; Lynch-Stieglitz, J.; Zhang, R. Western Pacific Stable Isotope Data Around the Intertropical Convergence Zone during the Last Glacial Maximum 2014-11-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17415 Investigator P.J. Leech Investigator J. Lynch-Stieglitz Investigator R. Zhang earth science paleoclimate paleoceanography number of samples,null,null,null,null,paleoceanography,null,null,N,Number of foraminifera in analysis earth science paleoclimate paleoceanography delta 13C,Globorotalia tumida,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Globorotalia tumida,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes geoscientificInformation Intertropical Convergence Zone (ITCZ) Last Glacial Maximum Complete -17.7 14.4 139.5 176.2 -3669 -1746 Ocean Pacific Ocean Western Pacific Ocean VM28-233>LATITUDE -6.3>LONGITUDE 161.4 Ocean Pacific Ocean Western Pacific Ocean VM28-229>LATITUDE -8.4>LONGITUDE 167.8 Ocean Pacific Ocean Western Pacific Ocean VM28-227>LATITUDE -10.7>LONGITUDE 168.7 Ocean Pacific Ocean Western Pacific Ocean GGC-49>LATITUDE 7.9>LONGITUDE 139.5 Ocean Pacific Ocean Western Pacific Ocean VM28-246>LATITUDE 14.4>LONGITUDE 142.7 Ocean Pacific Ocean Western Pacific Ocean VM28-235>LATITUDE -5.5>LONGITUDE 160.5 Ocean Pacific Ocean Western Pacific Ocean VM28-213>LATITUDE -14.9>LONGITUDE 176.2 Ocean Pacific Ocean Western Pacific Ocean VM24-150>LATITUDE -2.2>LONGITUDE 155.7 Ocean Pacific Ocean Western Pacific Ocean VM19-110>LATITUDE 11.9>LONGITUDE 140.1 Ocean Pacific Ocean Western Pacific Ocean RC17-176>LATITUDE 3.8>LONGITUDE 158.8 Ocean Pacific Ocean Western Pacific Ocean VM28-230>LATITUDE -5.5>LONGITUDE 166.8 Ocean Pacific Ocean Western Pacific Ocean VM28-236>LATITUDE -3.6>LONGITUDE 162 Ocean Pacific Ocean Western Pacific Ocean VM28-234>LATITUDE -7.1>LONGITUDE 159 Ocean Pacific Ocean Western Pacific Ocean VM34-2>LATITUDE -17.7>LONGITUDE 176.1 Ocean Pacific Ocean Western Pacific Ocean VM24-110>LATITUDE 2.4>LONGITUDE 156.7 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Leech, P.J., J. Lynch-Stieglitz and R. Zhang 2013 Western Pacific thermocline structure and the Pacific marine Intertropical Convergence Zone during the Last Glacial Maximum Earth and Planetary Science Letters 363 133-143 10.1016/j.epsl.2012.12.026

Paleoclimate proxy evidence suggests a southward shift of the Intertropical Convergence Zone (ITCZ) during times of Northern Hemisphere cooling, including the Last Glacial Maximum, 19–23 ka before present. However, evidence for movement over the Pacific has mainly been limited to precipitation reconstructions near the continents, and the position of the Pacific marine ITCZ is less well constrained. In this study, we address this problem by taking advantage of the fact that the upper ocean density structure reflects the overlying wind field. We reconstruct changes in the upper ocean density structure during the LGM using oxygen isotope measurements on the planktonic foraminifera G. ruber and G. tumida in a transect of sediment cores from the Western Tropical Pacific. The data suggests a ridge in the thermocline just north of the present-day ITCZ persists for at least part of the LGM, and a structure in the Southern Hemisphere that differs from today. The reconstructed structure is consistent with that produced in a General Circulation Model with both a Northern and Southern Hemisphere ITCZ.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-236.txt Formatted Text File; VM28-236 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm19-110.txt Formatted Text File; VM19-110 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm24-150.txt Formatted Text File; VM24-150 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-227.txt Formatted Text File; VM28-227 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-ggc49.txt Formatted Text File; GGC-49 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-246.txt Formatted Text File; VM28-246 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm24-110.txt Formatted Text File; VM24-110 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-213.txt Formatted Text File; VM28-213 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-229.txt Formatted Text File; VM28-229 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-233.txt Formatted Text File; VM28-233 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-rc17-176.txt Formatted Text File; RC17-176 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-235tw.txt Formatted Text File; VM28-235TW Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-234.txt Formatted Text File; VM28-234 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-230.txt Formatted Text File; VM28-230 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm28-235.txt Formatted Text File; VM28-235 Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leech2013/leech2013-vm34-2.txt Formatted Text File; VM34-2 Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11