Forward modeling of δ 18 O in Andean ice cores
نویسندگان
چکیده
منابع مشابه
Gases in ice cores.
Air trapped in glacial ice offers a means of reconstructing variations in the concentrations of atmospheric gases over time scales ranging from anthropogenic (last 200 yr) to glacial/interglacial (hundreds of thousands of years). In this paper, we review the glaciological processes by which air is trapped in the ice and discuss processes that fractionate gases in ice cores relative to the conte...
متن کاملHighly resolved δ 13 C measurements on CO 2 in air from Antarctic ice cores
A new method for δC analysis of very small air amounts of less than 0.5 cm STP was developed. This corresponds to less than 10 g of ice. It is based on the needle-crasher technique, which is routinely used for CO2 concentration measurements by infrared laser absorption. The extracted air is slowly expanded into a large volume through a water trap held at −70 C where the pressure is measured. Th...
متن کاملPast temperature from ice cores
V. Masson-Delmotte, G. Dreyfus, P. Braconnot, S. Johnsen, J. Jouzel, M. Kageyama, A. Landais, M.-F. Loutre, J. Nouet, F. Parrenin, D. Raynaud, B. Stenni, and E. Tuenter Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ, Bat 701 L’Orme des Merisiers, CEA Saclay, 91 191 Gif-sur-Yvette cédex, France Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark Institute...
متن کاملCombining Denitrifying Bacteria and Laser Spectroscopy for Isotopic Analyses (δ(15)N, δ(18)O) of Dissolved Nitrate.
We present a novel approach for nitrogen (δ(15)N) and oxygen (δ(18)O) isotopic analysis of nitrate in water based on the isotopic analysis of N2O produced from the conversion of NO3(-) by cultured denitrifying bacteria and off-axis integrated cavity output spectroscopy (OA-ICOS). The headspace N2O was manually injected into an OA-ICOS isotopic N2O laser analyzer through a syringe septum port. S...
متن کاملHolocene tropical South American hydroclimate revealed from a decadally resolved lake sediment δ18O record
a r t i c l e i n f o Keywords: South American summer monsoon oxygen isotopes precessional forcing abrupt climate change lake sediments Oxygen isotope ratios of authigenic calcite (δ 18 O cal) measured at annual to decadal resolution from Laguna Pumacocha document Andean precipitation variability during the last 11,200 years. Modern limnological data show that Pumacocha δ 18 O cal reflects the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2016
ISSN: 0094-8276,1944-8007
DOI: 10.1002/2016gl070150