A Caltech Library Service

Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds

Hinojosa, Jessica L. and Moy, Christopher M. and Vandergoes, Marcus and Feakins, Sarah J. and Sessions, Alex L. (2019) Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds. Paleoceanography and Paleoclimatology, 34 (12). pp. 2158-2170. ISSN 2572-4517. doi:10.1029/2019pa003656.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Supplemental Material
See Usage Policy.


Use this Persistent URL to link to this item:


Millennial‐scale climate anomalies punctuating the last deglaciation were expressed differently in the Northern and Southern Hemispheres. While changes in oceanic meridional overturning circulation have been invoked to explain these disparities, the nearly synchronous onset of such events requires atmospheric mediation. Yet the extent and structure of atmospheric reorganization on millennial timescales remains unclear. In particular, the role of the Southern Hemisphere westerly winds (SHWW) and associated storm tracks is poorly constrained, largely due to the paucity of accessible archives of wind behavior. Here we present a new paleohydrologic record from a Lake Hayes, New Zealand (45° S) sediment core from ~17‐9 ka. Using two independent proxies for lake hydrology (Ca/Ti in sediments and δD values of aquatic plant biomarkers), we find evidence for a wetter Antarctic Cold Reversal (ACR, 14.7‐13.0 ka) and a drying trend during the Younger Dryas (YD, 12.9‐11.6 ka) and early Holocene (11.7 ka onward in this record). Comparisons of the Lake Hayes record with other Southern Hemisphere sites indicate coherent atmospheric shifts during the ACR and YD, whereby the former is wetter/cooler and the latter is drier/warmer. The wet/cool phase is associated with a northward shift and/or strengthening of the SHWW, whereas the drier/warmer phase indicates weaker mid‐latitude winds. These climatic trends are opposite to the Northern Hemisphere. There is a decoupling of climatic trends between Southern Hemisphere low‐ and mid‐latitude climates in the early Holocene, which could be explained by several mechanisms, such as the retreat of Antarctic sea ice.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hinojosa, Jessica L.0000-0002-8589-102X
Moy, Christopher M.0000-0002-2177-5265
Vandergoes, Marcus0000-0001-7417-7747
Feakins, Sarah J.0000-0003-3434-2423
Sessions, Alex L.0000-0001-6120-2763
Additional Information:© 2019 American Geophysical Union. Received 13 MAY 2019; Accepted 8 NOV 2019; Accepted article online 13 NOV 2019; Published online 26 DEC 2019. The data underlying this work can be found in the NOAA World Data Service for Paleoclimatology database ( Funding for field work was provided by a University of Otago Research Grant to CMM. JLH was supported by the California Alliance for Graduate Education & The Professoriate and the Geological and Planetary Sciences Division at Caltech. We thank Fenfang Wu for lab support and Brent Pooley, Greer Gilmer, Christina Riesselman, Harris Anderson and Steve Little for help during fieldwork. Additional thanks to the Feakins IRMS Lab at USC for support and use of facilities. Finally, we are very grateful to one anonymous reviewer, Associate Editor Jim Russell, and Editor-in-Chief Ellen Thomas for their thoughtful and constructive feedback, which greatly improved this paper.
Funding AgencyGrant Number
University of OtagoUNSPECIFIED
California Alliance for Graduate Education and the ProfessoriateUNSPECIFIED
Caltech Division of Geological and Planetary SciencesUNSPECIFIED
Subject Keywords:Southern Hemisphere westerly winds; New Zealand; Paleohydrology; Late Glacial/early Holocene
Issue or Number:12
Record Number:CaltechAUTHORS:20191203-102139413
Persistent URL:
Official Citation:Hinojosa, J.L., Moy, C.M., Vandergoes, M., Feakins, S.J. and Sessions, A.L. (2019), Hydrologic Change in New Zealand During the Last Deglaciation Linked to Reorganization of the Southern Hemisphere Westerly Winds. Paleoceanography and Paleoclimatology, 34: 2158-2170. doi:10.1029/2019PA003656
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100163
Deposited By: Tony Diaz
Deposited On:03 Dec 2019 18:29
Last Modified:16 Nov 2021 17:52

Repository Staff Only: item control page