This paper presents the results of a comparative wavelet coherence analysis of a multimillennial nitrate record with a number of climatic and solar activity proxies. Distinguishing between these factors is important in the view of a possibility of nitrate deposited in a polar region to represent galactic cosmic ray flux and, consequently, solar activity. We used the data from the TALDICE drilling project (Talos Dome, Antarctica), which covers the age range 12,000-700 BP (years before present, i.e. before 1950) and includes records of nitrate as well as climatic proxies, such as Na+, Ca2+, MSA (methanesulphonic acid), δ18O, SO42-. The solar activity series is represented by reconstructions of the heliospheric modulation parameter from the 14C and 10Be data. We found (1) a confirmation of multimillennial relation between nitrate and galactic cosmic ray flux; (2) no clear signature of long-term variations of nitrate transport from lower latitudes. We suggest that variations in the nitrate record in the time scale of hundreds-thousands years are most likely caused by local production, deposition and post-deposition processes.
Cosmogenic production and climate contributions to nitrate record in the TALDICE Antarctic ice core / Poluianov, S; Traversi, R.; Usoskin, I.. - In: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS. - ISSN 1364-6826. - STAMPA. - 121:(2014), pp. 50-58. [10.1016/j.jastp.2014.09.011]
Cosmogenic production and climate contributions to nitrate record in the TALDICE Antarctic ice core
TRAVERSI, RITA;
2014
Abstract
This paper presents the results of a comparative wavelet coherence analysis of a multimillennial nitrate record with a number of climatic and solar activity proxies. Distinguishing between these factors is important in the view of a possibility of nitrate deposited in a polar region to represent galactic cosmic ray flux and, consequently, solar activity. We used the data from the TALDICE drilling project (Talos Dome, Antarctica), which covers the age range 12,000-700 BP (years before present, i.e. before 1950) and includes records of nitrate as well as climatic proxies, such as Na+, Ca2+, MSA (methanesulphonic acid), δ18O, SO42-. The solar activity series is represented by reconstructions of the heliospheric modulation parameter from the 14C and 10Be data. We found (1) a confirmation of multimillennial relation between nitrate and galactic cosmic ray flux; (2) no clear signature of long-term variations of nitrate transport from lower latitudes. We suggest that variations in the nitrate record in the time scale of hundreds-thousands years are most likely caused by local production, deposition and post-deposition processes.File | Dimensione | Formato | |
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