Patagonian glacier response during the late glacial-holocene transition

被引：53

作者：

Ackert, Robert P., Jr. ^{[1
]}

Becker, Richard A. ^{[2
]}

Singer, Brad S. ^{[2
]}

Kurz, Mark D. ^{[3
]}

Caffee, Marc W. ^{[4
]}

Mickelson, David M. ^{[2
]}

机构：

[1] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA

[2] Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA

[3] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA

[4] Purdue Univ, Purdue Rare Isotope Measurement Lab, W Lafayette, IN 47907 USA

来源：

SCIENCE | 2008年 / 321卷 / 5887期

关键词：

D O I：

10.1126/science.1157215

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Whether cooling occurred in the Southern Hemisphere during the Younger Dryas (YD) is key to understanding mechanisms of millennial climate change. Although Southern Hemisphere records do not reveal a distinct climate reversal during the late glacial period, many mountain glaciers readvanced. We show that the Puerto Bandera moraine (50 degrees S), which records a readvance of the Southern Patagonian Icefield (SPI), formed at, or shortly after, the end of the YD. The exposure age (10.8 +/- 0.5 thousand years ago) is contemporaneous with the highest shoreline of Lago Cardiel (49 degrees S), which records peak precipitation east of the Andes since 13 thousand years ago. Absent similar moraines west of the Andes, these data indicate an SPI response to increased amounts of easterly-sourced precipitation-reflecting changes in the Southern Westerly circulation-rather than regional cooling.

引用

页码：392 / 395

页数：4

共 25 条

[1] The Younger Dryas cold interval as viewed from central Greenland [J].

Alley, RB .

QUATERNARY SCIENCE REVIEWS, 2000, 19 (1-5) :213-226

[2] Comment on "absence of cooling in New Zealand and the adjacent ocean during the younger dryas chronozone" [J].

Applegate, Patrick J. ;

Lowell, Thomas V. ;

Alley, Richard B. .

SCIENCE, 2008, 320 (5877)

[3]

ASHWORTH AC, 1994, ANTHROPOLOGIE, V98, P3

[4] Absence of cooling in New Zealand and the adjacent ocean during the younger dryas chronozone [J].

Barrows, Timothy T. ;

Lehman, Scott J. ;

Fifield, L. Keith ;

De Deckker, Patrick .

SCIENCE, 2007, 318 (5847) :86-89

[5] The last glacial-holocene transition in southern Chile [J].

Bennett, KD ;

Haberle, SG ;

Lumley, SH .

SCIENCE, 2000, 290 (5490) :325-328

[6] Asynchrony of Antarctic and Greenland climate change during the last glacial period [J].

Blunier, T ;

Chappellaz, J ;

Schwander, J ;

Dallenbach, A ;

Stauffer, B ;

Stocker, TF ;

Raynaud, D ;

Jouzel, J ;

Clausen, HB ;

Hammer, CU ;

Johnsen, SJ .

NATURE, 1998, 394 (6695) :739-743

[7] YOUNGER DRYAS AGE ADVANCE OF FRANZ-JOSEF GLACIER IN THE SOUTHERN ALPS OF NEW-ZEALAND [J].

DENTON, GH ;

HENDY, CH .

SCIENCE, 1994, 264 (5164) :1434-1437

[8] Cosmogenic nuclide surface exposure dating of boulders on last-glacial and late-glacial moraines, Lago Buenos Aires, Argentina: Interpretive strategies and paleoclimate implications [J].

Douglass, D. C. ;

Singer, B. S. ;

Kaplan, M. R. ;

Mickelson, D. M. ;

Caffee, M. W. .

QUATERNARY GEOCHRONOLOGY, 2006, 1 (01) :43-58

[9] Tracking abrupt climate change in the Southern Hemisphere:: a seismic stratigraphic study of Lago Cardiel, Argentina (49°S) [J].

Gilli, A ;

Anselmetti, FS ;

Ariztegui, D ;

Bradbury, JP ;

Kelts, KR ;

Markgraf, V ;

McKenzie, JA .

TERRA NOVA, 2001, 13 (06) :443-448

[10] Evidence from the Rio Bayo valley on the extent of the North Patagonian Icefield during the Late Pleistocene-Holocene transition [J].

Glasser, NF ;

Harrison, S ;

Ivy-Ochs, S ;

Duller, GAT ;

Kubik, PW .

QUATERNARY RESEARCH, 2006, 65 (01) :70-77

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