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Revisiting the andean tropical glacier behavior during the Antarctic cold reversal
- Source :
- Cuadernos de Investigación Geográfica, Vol 43, Iss 2, Pp 629-648 (2017), Cuadernos de Investigación Geográfica, Cuadernos de Investigación Geográfica, Universidad de La Rioja, 2017, 43 (2), pp.629. ⟨10.18172/cig.3201⟩
- Publication Year :
- 2017
- Publisher :
- Universidad de La Rioja, 2017.
-
Abstract
- The sensitivity of tropical glaciers to paleoclimatic conditions that prevailed during the Antarctic cold reversal (ACR, ca. 14.5-12.9 ka) has been the subject of a wide debate. In 2014 a paper suggested that tropical glaciers responded very sensitively to the changing climate during the ACR (Jomelli et al., 2014). In this study, we reexamine the conclusions from this study by recalculating previous chronologies based on 226 10Be and 14 3He ages respectively, and using the most up-to date production rates for these cosmogenic nuclides in the Tropical Andes. 53 moraines from 25 glaciers were selected from the previous analysis provided by Jomelli et al. (2014) located in Colombia, Peru and Bolivia. We then focused on two distinct calculations. First we considered the oldest moraine and its uncertainty for every glacier representing the preserved evidence of the maximum glacier extents during the last deglaciation period, and binned the results into 5 distinct periods encompassing the Antarctic cold reversal and Younger Dryas (YD) chronozones: pre-ACR, ACR, ACR-YD, YD and post-YD respectively. Results revealed a predominance of pre-ACR and ACR ages, accounting for 60% of the glaciers. Second we counted the number of moraines per glacier according to the different groups. 21 moraines (40%) of the selected glaciers belong to the pre-ACR-ACR chronozones while 3 moraines only (5%) were dated to the YD and YD-Holocene groups. The rest was assigned to the ACR-YD. These results suggest that moraine records are a very good proxy to document the ACR signal in the Tropical Andes.
- Subjects :
- Tropical andes
acr
010504 meteorology & atmospheric sciences
Geography, Planning and Development
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Environmental Science (miscellaneous)
010502 geochemistry & geophysics
01 natural sciences
Antarctic Cold Reversal
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Earth and Planetary Sciences (miscellaneous)
Deglaciation
Younger Dryas
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
Cosmogenic nuclide
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
cosmogenic nuclids
geography
Geography (General)
geography.geographical_feature_category
younger dryas
Glacier
13. Climate action
Moraine
[SDU]Sciences of the Universe [physics]
G1-922
tropical glaciers
Physical geography
Geology
Subjects
Details
- Language :
- English
- ISSN :
- 16979540 and 02116820
- Volume :
- 43
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Cuadernos de Investigación Geográfica
- Accession number :
- edsair.doi.dedup.....1d59fbb404ca35511cd8584f95b37130