Microparticle and Trace Element Studies

McConnell, J. R.

doi:10.1016/b0-444-52747-8/00336-7

Cited by 1 publication

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“…Polar ice cores provide continuous archives of past climate and atmospheric conditions, − with the possibility for reconstructions at high temporal resolution. Greenland deep ice cores cover the last glacial-interglacial cycle, , whereas some Antarctic ice cores archive up to 800 000 years of past climate .…”

Section: Introductionmentioning

confidence: 99%

An Optical Dye Method for Continuous Determination of Acidity in Ice Cores

Kjær

Vallelonga

Svensson

et al. 2016

Environ. Sci. Technol.

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The pH of polar ice is important for the stability and mobility of impurities in ice cores and can be strongly influenced by volcanic eruptions or anthropogenic emissions. We present a simple optical method for continuous determination of acidity in ice cores based on spectroscopically determined color changes of two common pH-indicator dyes, bromophenol blue, and chlorophenol red. The sealed-system method described here is not equilibrated with CO, making it simpler than existing methods for pH determination in ice cores and offering a 10-90% peak response time of 45 s and a combined uncertainty of 9%. The method is applied to Holocene ice core sections from Greenland and Antarctica and compared to standard techniques such as electrical conductivity measurement (ECM) conducted on the solid ice, and electrolytic meltwater conductivity, EMWC. Acidity measured in the Greenland NGRIP ice core shows good agreement with acidity calculated from ion chromatography. Conductivity and dye-based acidity H are found to be highly correlated in the Greenland NEGIS firn core (75.38° N, 35.56° W), with all signals greater than 3σ variability coinciding with either volcanic eruptions or possible wild fire activity. In contrast, the Antarctic Roosevelt Island ice core (79.36° S, 161.71° W) features an anticorrelation between conductivity and H, likely due to strong influence of marine salts.

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