<p>To recover very old climate information from ice core records, one needs to interpret the deepest part of an ice core. As the oldest record, the Dome-C ice core can serve as an analogue for the Beyond EPICA Oldest Ice Core that is currently being drilled.<br><br>Pol et al., EPSL 2010 analyzed high resolution water isotope data from the Dome-C ice core and found evidence for a limited preservation of climate variability in the deep section of the core due to mixing and diffusion. For instance, for Marine Isotope Stage 19, the study estimated a mixing/diffusion length between 40 and 60 cm, a value more than double than&#160;what is&#160;predicted by current firn and&#160;ice diffusion&#160;models. Knowing the diffusion length is important to interpret the isotope signal and is the basis to deconvolve climate records. As a result, it is key to bridge the gap in the estimation of the diffusion length between potentially biased statistical methods and firn and ice diffusion models.<br>We review this diffusion length estimate for MIS19, and also outline a new&#160;general&#160;method how to estimate the diffusion length in&#160;highly thinned deep ice.&#160; This approach presents&#160;an important tool for better characterizing the preservation of the climate signal in old ice&#160;and thus&#160;for&#160;designing optimal sampling and recovery strategies.</p><p>&#160;</p>
Radiative Efficiency and Charge‐Carrier Lifetimes and Diffusion Length in Polycrystalline CdSeTe Heterostructures
