TY - JOUR
T1 - Stable isotopic composition in snowpack along the traverse from a coastal location to Dome A (East Antarctica)
T2 - Results from observations and numerical modeling
AU - Ma, Tianming
AU - Li, Li
AU - Li, Yuansheng
AU - An, Chunlei
AU - Yu, Jinhai
AU - Ma, Hongmei
AU - Jiang, Su
AU - Shi, Guitao
N1 - Publisher Copyright:
© 2020 Elsevier B.V. and NIPR
PY - 2020/6
Y1 - 2020/6
N2 - Stable isotopic composition (δ18O and δD) in Antarctic snow/ice cores serves as the proxy of past temperature. However, the accuracy of temperature reconstruction is largely dependent on the relationship between water isotopes and local temperature (δ-T) derived from present conditions. Thus, it is crucial to quantitatively understand the spatial δ-T relationship and the influencing factors of δ18O and δD in surface snow besides temperature. In this work, we characterized the spatial and temporal variation of stable isotopes in surface snow using a comprehensive assessment of observations and simulations on the traverse from the coast to Dome A, the summit of East Antarctica ice sheet. The δ18O and δD from surface snow and snow pit samples show an insignificant variation at interannual scale, possibly suggesting that interannual changes in controlling factors are not remarkable during the investigation period. Along the traverse, the spatial δ18O-T slope is 0.91‰·oC−1 based on averages of δ18O measurements for snow pits and annual mean temperature at the sampling site. Results from the mixed cloud isotope model (MCIM) suggest that the effects of evaporative conditions and transportation paths of moisture on water isotopes for specific sites are insignificant. Therefore, it is more important to consider other effects on water isotopes (e.g. post-depositional processes) when interpreting ice core records, particularly in interior Antarctica.
AB - Stable isotopic composition (δ18O and δD) in Antarctic snow/ice cores serves as the proxy of past temperature. However, the accuracy of temperature reconstruction is largely dependent on the relationship between water isotopes and local temperature (δ-T) derived from present conditions. Thus, it is crucial to quantitatively understand the spatial δ-T relationship and the influencing factors of δ18O and δD in surface snow besides temperature. In this work, we characterized the spatial and temporal variation of stable isotopes in surface snow using a comprehensive assessment of observations and simulations on the traverse from the coast to Dome A, the summit of East Antarctica ice sheet. The δ18O and δD from surface snow and snow pit samples show an insignificant variation at interannual scale, possibly suggesting that interannual changes in controlling factors are not remarkable during the investigation period. Along the traverse, the spatial δ18O-T slope is 0.91‰·oC−1 based on averages of δ18O measurements for snow pits and annual mean temperature at the sampling site. Results from the mixed cloud isotope model (MCIM) suggest that the effects of evaporative conditions and transportation paths of moisture on water isotopes for specific sites are insignificant. Therefore, it is more important to consider other effects on water isotopes (e.g. post-depositional processes) when interpreting ice core records, particularly in interior Antarctica.
KW - Isotope-temperature relationship
KW - MCIM
KW - Moisture source diagnosis
KW - Transportation path
KW - Water stable isotopes
UR - https://www.scopus.com/pages/publications/85079384575
U2 - 10.1016/j.polar.2020.100510
DO - 10.1016/j.polar.2020.100510
M3 - 文章
AN - SCOPUS:85079384575
SN - 1873-9652
VL - 24
JO - Polar Science
JF - Polar Science
M1 - 100510
ER -