1. Reconstruction of Past Antarctic Temperature Using Present Seasonal δ18O--Inversion Layer Temperature: Unified Slope Equations and Applications.
- Author
-
LIU, Z., HE, C., YAN, M., BUIZERT, C., OTTO-BLIESNER, B. L., LU, F., and ZENG, C.
- Subjects
TEMPERATURE inversions ,ICE cores ,TEMPERATURE ,SURFACE reconstruction ,SEASONS ,SURFACE temperature - Abstract
Reconstructing the history of polar temperature from ice core water isotope (δ
18 O) calibration has remained a challenge in paleoclimate research, because of our incomplete understanding of various temperature--δ18 O relationships. This paper resolves this classical problem in a new framework called the unified slope equations (USE), which illustrates the general relations among spatial and temporal δ18 O--surface temperature slopes. The USE is applied to the Antarctica temperature change during the last deglaciation in model simulations and observations. It is shown that the comparable Antarcticamean spatial slope with deglacial temporal slope in δ18 O--surface temperature reconstruction is caused, accidentally, by the compensation responses between the δ18 O--inversion layer temperature relation and the inversion layer temperature itself. Furthermore, in light of the USE, we propose that the present seasonal slope of δ18 O--inversion layer temperature is an optimal paleothermometer that is more accurate and robust than the spatial slope. This optimal slope suggests the possibility of reconstructing past Antarctic temperature changes using present and future instrumental observations. [ABSTRACT FROM AUTHOR]- Published
- 2023
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