Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Paleoglaciation of Shaluli Shan, southeastern Tibetan Plateau
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. Purdue University.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Show others and affiliations
2013 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 64, 121-135 p.Article in journal (Refereed) Published
Abstract [en]

Reconstructing the paleoglaciation of the Tibetan Plateau is critical to understanding linkages between regional climate changes and global climate changes, and here we focus on the glacial history of the Shaluli Shan, an area of the southeastern Tibetan Plateau that receives much of its precipitation from monsoon flow. Based on field investigation, geomorphological mapping, and Be-10 exposure dating of moraines, we identify glacial deposits from the Late Glacial, with minimum ages at 13.0 +/- 1.2 -17.1 +/- 1.6 ka, global Last Glacial Maximum (gLGM) at 21.6 +/- 2.0 ka, and pre-gLGM at 102.3 +/- 10.0-183.6 +/- 17.0 ka. These ages are consistent with and significantly extend the known range from most prior chronological work using terrestrial cosmogenic nuclides in this area, and include a set of dates for the Kuzhaori moraine that raise questions about prior chronologies based on the electron spin resonance technique. Ice caps about 4000 km(2) in size covered the Haizishan Plateau and the Xinlong Plateau during the global LGM, with large glaciers extending far down outlet valleys. The presence of ice cap glaciation, here, contrasts strongly to glaciation elsewhere in the Shaluli Shan and more central regions of the Tibetan Plateau where ice expansion remained constricted to valleys. This work provides important insights into the paleoclimate pattern and monsoon evolution of the Tibetan Plateau over past glacial cycles and indicates that the Shaluli Shan has a glacial chronology more consistent with the Northern Hemisphere paleo-ice sheets than other areas of the Tibetan Plateau.

Place, publisher, year, edition, pages
2013. Vol. 64, 121-135 p.
Keyword [en]
Tibetan Plateau, Glaciation, Cosmogenic exposure dating, Last Glacial Maximum, Monsoon
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-92042DOI: 10.1016/j.quascirev.2012.12.009ISI: 000319951600008OAI: oai:DiVA.org:su-92042DiVA: diva2:636985
Funder
Swedish Research Council, 578 348-2004-5684Sida - Swedish International Development Cooperation Agency, 348-2007-6924
Note

AuthorCount:7;

 

Available from: 2013-07-15 Created: 2013-07-15 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Paleoglaciology of Shaluli Shan, southeastern Tibetan Plateau
Open this publication in new window or tab >>Paleoglaciology of Shaluli Shan, southeastern Tibetan Plateau
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Reconstructing the paleoglaciation of the Tibetan Plateau is critical to understanding linkages between regional climate changes and global climate changes. This work focuses on the paleoglaciology of the Shaluli Shan Mountain area in the southeastern Tibetan Plateau. Multiple approaches, including geomorphological mapping, field assessment, cosmogenic nuclide exposure dating, and numerical glacier modeling are employed to reconstruct the extent, timing, erosion patterns, basal thermal regime, and ice dynamic of past glaciation of the Shaluli Shan. Detailed geomorphological mapping and analysis provide evidence for multiple past glaciations involving valley glaciers and small ice fields in the high mountains and ice caps on low-relief plateaus at intermediate elevations. Ice cap glaciation on the low-relief Haizishan Plateau produced glacial landforms in a zonal pattern, suggesting that the Haizishan paleo-ice cap had a complex basal thermal regime. 10Be exposure ages for glacial erratics and till depth profiles constrain three major glaciations in the Shaluli Shan: pre global Last Glacial Maximum (gLGM) (with minimum ages at 102.3 ± 10.0 – 183.6 ± 17.0 ka), gLGM (21.6 ± 2.0 ka), and Late Glacial (13.0 ± 1.2 – 17.1 ± 1.6 ka) . Extensive glacier expansion in the Shaluli Shan during Marine Isotope Stage (MIS) 6 and gLGM, and the lack of evidence of glaciation during MIS 4 and 3, suggests that the extent and timing of glaciations in the southeastern Tibetan Plateau are synchronized with northern Hemisphere climate changes. The glacial erosion depth constraints based on 10Be and 26Al concentrations in bedrock, glacial erratics, and till depth profiles indicate a complex glacial erosion pattern during the gLGM and Late Glacial, consistent with the hypothesis of complex basal thermal regime of Haizishan paleo-ice cap. Numerical model simulations of a Haizishan ice cap also predict a complex basal thermal regime and indicate high sensitivity of the ice cap to past temperature.

 

Abstract [sv]

Rekonstruktioner av Tibetanska platåns paleoglaciologi är av stor vikt för att förstå kopplingen mellan regionala och globala klimatförändringar. Det här arbetet fokuserar på paleoglaciologin i Shaluli Shan-bergen i sydöstra delen av den Tibetanska platån, där syftet har varit att rekonstruera utbredning, ålder, erosions-mönster, subglacial temperatur och isdynamik under tidigare nedisningsperioder i området. De metoder som använts har varit geomorfologisk kartering med hjälp av satellitbilder och höjdmodeller, fältkartering och -provtagning, ytexponerings-datering och numerisk modellering av glaciärer. Den detaljerade geomorfologiska karteringen av nedisningsspår visar att tidigare nedisningar framför allt har förekommit i form av tillväxt av dalglaciärer och små isfält i de höga bergsområdena samt platåisar på flacka platåytor på mellanhöga höjder. De platåisar som har vuxit till på den flacka Haizishan-platån har skapat glaciala landformer med en utbredning som tyder på att Haizishan-isen hade ett komplext mönster av bottentemperatur med både varm- och kallbottnade delar. Kosmogen ytexponerings-datering, baserad på koncentration av 10Be-isotoper i flyttblock och morän-profiler, visar tre perioder av nedisning i Shaluli Shan: tidig isexpansion med minimi-åldrar på 102.3 ± 10.0 – 183.6 ± 17.0 ka (ka=1000 år före nu), nedisning under det senaste globala glaciala maximat (gLGM) vid 21.6 ± 2.0 ka, samt  en sen fas av tillväxt av glaciärer vid  13.0 ± 1.2 – 17.1 ± 1.6 ka. Utbredd nedisning under perioden 102-184 ka och under gLGM, samt bristen på spår av nedisning under perioden däremellan, tyder på att nedisningen av den sydöstra Tibetanska platån sker i takt med de klimatförändringar och perioder av glaciärtillväxt som förekommit på övriga norra halvklotet under samma tid. Omfattningen av den glaciala erosionen, vilken analyserats med hjälp av koncentrationer av 10Be- och 26Al-isotoper i berggrund, flyttblock och morän-profiler, tyder på att platåisarna hade ett komplext erosionsmönster under gLGM och den sista delen av nedisningen. Detta stödjer den tidigare slutsatsen om en komplex subglacial temperaturfördelning under den tidigare platåisen på Haizishan. Även numerisk glaciologisk modellering av nedisningen på Haizishan-platån visar på en komplex subglacial temperatur-regim, vilket i sin tur tyder på en hög temperaturkänslighet för tidigare platåisar i området.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2013. 30 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 39
Keyword
Paleoglaciology, Tibetan Plateau, geomorphological mapping, cosmogenic nuclide, Last Glacial Maximum, glacial erosion, basal thermal regime, paleoglaciologi, Tibetanska platån, geomorfologisk kartering, kosmogena isotoper, senaste glaciala maximat, glacial erosion, subglacial temperatur
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-94204 (URN)978-91-7447-803-7 (ISBN)
Public defence
2013-12-03, De Geer lecture hall, The Geoscience building, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.

Available from: 2013-11-11 Created: 2013-09-30 Last updated: 2013-11-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Fu, PingStroeven, Arjen P.
By organisation
Department of Physical Geography and Quaternary Geology
In the same journal
Quaternary Science Reviews
Physical Geography

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 44 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf