Nitrate records of a shallow ice core from East Antarctica: Atmospheric processes, preservation and climatic implications

Author:

Laluraj C.M.1,Thamban M.2,Naik S.S.3,Redkar B.L.2,Chaturvedi A.4,Ravindra R.2

Affiliation:

1. National Centre for Antarctic and Ocean Research, India,

2. National Centre for Antarctic and Ocean Research, India

3. National Institute of Oceanography, India

4. Geological Survey of India (Antarctica Division), India

Abstract

High-resolution records of nitrate (NO3), oxygen isotope (δ 18O) and non-sea salt sulphate (nssSO42− ) were studied using an ice core collected from central Dronning Maud Land in East Antarctica to identify the influence of environmental variability on accumulation of NO3 over the past 450 years. The results confirmed that multiple processes were responsible for the production and preservation of NO3 in Antarctic ice. Correlation between NO3 and nssSO42− peaks revealed that sulphate aerosols released during major volcanic eruptions might have activated the production of nitric acid, which was scavenged by ion-induced nucleation in polar ice sheets. The correlation between the nitrate and δ18 O records further suggest that enhanced NO3 preservation in the ice occurred during periods of lower atmospheric temperature. Major shifts in the NO3 record of the ice core presently studied and its comparison with 10Be record from a core collected from South Pole suggest that a reduction in solar activity influenced the NO3 accumulation in Antarctica through enhanced production of odd nitrogen species.

Publisher

SAGE Publications

Subject

Paleontology,Earth-Surface Processes,Ecology,Archaeology,Global and Planetary Change

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