TY  - JOUR
A1  - Yuan, Xiaoping P.
A1  - Jiao, Ruohong
A1  - Dupont-Nivet, Guillaume
A1  - Shen, Xiaoming
T1  - Southeastern Tibetan Plateau growth revealed by inverse analysis of landscape evolution model
JF  - Geophysical research letters
N2  - The Cenozoic history of the Tibetan Plateau topography is critical for understanding the evolution of the Indian-Eurasian collision, climate, and biodiversity. However, the long-term growth and landscape evolution of the Tibetan Plateau remain ambiguous, it remains unclear if plateau uplift occurred soon after the India-Asia collision in the Paleogene (similar to 50-25 Ma) or later in the Neogene (similar to 20-5 Ma). Here, we reproduce the uplift history of the southeastern Tibetan Plateau using a 2D landscape evolution model, which simultaneously solves fluvial erosion and sediment transport processes in the drainage basins of the Three Rivers region (Yangtze, Mekong, and Salween Rivers). Our model was optimized through a formal inverse analysis with 20,000 forward simulations, which aims to reconcile the transient states of the present-day river profiles. The results, compared to existing paleoelevation and thermochronologic data, suggest initially low elevations (similar to 300-500 m) during the Paleogene, followed by a gradual southeastward propagation of topographic uplift of the plateau margin.
KW  - Tibetan Plateau
KW  - landscape evolution
KW  - fluvial erosion
KW  - inverse analysis
KW  - mountain growth
KW  - propagating uplift
Y1  - 2022
U6  - https://doi.org/10.1029/2021GL097623
SN  - 0094-8276
SN  - 1944-8007
VL  - 49
IS  - 10
PB  - American Geophysical Union
CY  - Washington
ER  - 
TY  - JOUR
A1  - Licht, Alexis
A1  - Kelson, Julia
A1  - Bergel, Shelly J.
A1  - Schauer, Andrew J.
A1  - Petersen, Sierra Victoria
A1  - Capirala, Ashika
A1  - Huntington, Katharine W.
A1  - Dupont-Nivet, Guillaume
A1  - Win, Zaw
A1  - Aung, Day Wa
T1  - Dynamics of pedogenic carbonate growth in the tropical domain of Myanmar
JF  - Geochemistry, geophysics, geosystems
N2  - Pedogenic carbonate is widespread at mid latitudes where warm and dry conditions favor soil carbonate growth from spring to fall. The mechanisms and timing of pedogenic carbonate formation are more ambiguous in the tropical domain, where long periods of soil water saturation and high soil respiration enhance calcite dissolution. This paper provides stable carbon, oxygen and clumped isotope values from Quaternary and Miocene pedogenic carbonates in the tropical domain of Myanmar, in areas characterized by warm (>18°C) winters and annual rainfall up to 1,700 mm. We show that carbonate growth in Myanmar is delayed to the driest and coldest months of the year by sustained monsoonal rainfall from mid spring to late fall. The range of isotopic variability in Quaternary pedogenic carbonates can be solely explained by temporal changes of carbonate growth within the dry season, from winter to early spring. We propose that high soil moisture year-round in the tropical domain narrows carbonate growth to the driest months and makes it particularly sensitive to the seasonal distribution of rainfall. This sensitivity is also enabled by high winter temperatures, allowing carbonate growth to occur outside the warmest months of the year. This high sensitivity is expected to be more prominent in the geological record during times with higher temperatures and greater expansion of the tropical realm. Clumped isotope temperatures, δ13C and δ18O values of tropical pedogenic carbonates are impacted by changes of both rainfall seasonality and surface temperatures; this sensitivity can potentially be used to track past tropical rainfall distribution.
KW  - clumped isotopes
KW  - pedogenic carbonate
KW  - monsoon
Y1  - 2022
U6  - https://doi.org/10.1029/2021GC009929
SN  - 1525-2027
VL  - 23
IS  - 7
PB  - American Geophysical Union
CY  - Washington
ER  -