Preprints
https://doi.org/10.5194/tc-2022-238
https://doi.org/10.5194/tc-2022-238
22 Dec 2022
 | 22 Dec 2022
Status: a revised version of this preprint was accepted for the journal TC and is expected to appear here in due course.

Asynchronous glacial extent during the Last Glacial Maximum in Ih Bogd massif of Gobi-Altay range, southwestern Mongolia: Aspect control on glacier mass balance

Purevmaa Khandsuren, Yeong Bae Seong, Hyun Hee Rhee, Cho-Hee Lee, Mehmet Akif Sarikaya, Jeong-Sik Oh, Khadbaatar Sandag, and Byung Yong Yu

Abstract. Most mid-latitude mountain glaciers reached their maximum extent around the global Last Glacial Maximum (gLGM). However, some also strongly responded to the regional climate change or local non-climatic factors such as topography, leading to asynchronous maximum advances. This study documents the maximum extent and chronology of two paleoglaciers in the Ih Bogd massif of Mongolia: one facing north into the Jargalant Valley and the other facing south into the Ih Artsan valley. 10Be surface exposure age dating revealed that the Ih Artsan short valley glacier reached its maximum position (MIh1) around 20.1 ± 0.7 ka, coinciding with the gLGM. In contrast, the Jargalant paleoglacier (MJ1) reached its maximum extent around 17.2 ± 1.5 ka, around Heinrich 1 stadial and during the post-gLGM northern hemisphere warming. Our 2D ice surface model, which includes the temperature-index melt model, suggests that an aspect can result in a melt difference between north and south-facing slopes. Glaciers retreated from their maximum modeled extent asynchronously when we assign a 0.5 ℃ lower temperature for Jargalant valley (northern slope), based on the observation that present-day mean annual Jargalant temperatures are lower than in the south-facing Ih Arstan. Modelled timing of the maximum extents (20.23 ka in Ih Artsan, 17.13 ka in Jargalant) are consistent with 10Be exposure age results (20.1 ka in Ih Artsan, 17.2 ka in Jargalant). We also observed several sequences of post LGM or/and Holocene moraines in both cirques. Extremely old ages ranging from 636.2 ka to 35.9 ka were measured for the inner moraines in the Jargalant cirque (MJ2–MJ4), suggesting a problem with inheritance from boulders eroded from the summit plateau.

Purevmaa Khandsuren et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-238', Jigjidsurengiin Batbaatar, 19 Jan 2023
    • AC1: 'Reply on RC1', Yeong Bae Seong, 20 Mar 2023
  • RC2: 'Comment on tc-2022-238', Robin Blomdin, 25 Jan 2023
    • AC2: 'Reply on RC2', Yeong Bae Seong, 20 Mar 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-238', Jigjidsurengiin Batbaatar, 19 Jan 2023
    • AC1: 'Reply on RC1', Yeong Bae Seong, 20 Mar 2023
  • RC2: 'Comment on tc-2022-238', Robin Blomdin, 25 Jan 2023
    • AC2: 'Reply on RC2', Yeong Bae Seong, 20 Mar 2023

Purevmaa Khandsuren et al.

Purevmaa Khandsuren et al.

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Short summary
Moraine is one of the awe-inspiring landscapes in alpine, archiving information of past climate. We measured the timing of moraine formation on the Ih Bogd massif, southern Mongolia. Glaciers move synchronously in a region as a response to changing climate but our glacier on northern slope reached most extensively 3 millennia later than southern one. We further ran 2D Ice Surface model and found the diachronous behavior of glacier was real. Aspect also control the nutrition of alpine glacier.