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Role of mineral dust in the nitrate preservation during the glacial period: Insights from the RICE ice core.

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Title: Role of mineral dust in the nitrate preservation during the glacial period: Insights from the RICE ice core.
Authors: Venugopal, Abhijith U.1,2 (AUTHOR) abhi.ulayottilvenugopal@vuw.ac.nz, Bertler, Nancy A.N.1,2 (AUTHOR), Pyne, Rebecca L.1 (AUTHOR), Kjær, Helle A.3 (AUTHOR), Winton, V. Holly L.2 (AUTHOR), Mayewski, Paul A.4 (AUTHOR), Cortese, Giuseppe1 (AUTHOR)
Source: Global & Planetary Change. Feb2022, Vol. 209, pN.PAG-N.PAG. 1p.
Subjects: Glaciation, Ice cores, Mineral dusts, Nitrate minerals, Dust, Westerlies
Geographic Terms: Antarctica
Abstract: Nitrate (NO 3 −), an abundant aerosol in polar snow, is a complex environmental proxy to interpret owing to its diverse sources and susceptibility to post-depositional processes. During the last glacial period, when dust concentrations in the Antarctic ice were upto ~50 times than today, mineral dust appears to have a stabilizing effect on the NO 3 − concentration in snow. However, the mechanism leading to the stabilization remains unclear. Here, we present the new and highly resolved records of NO 3 − and non-sea salt calcium (nssCa2+, a proxy for mineral dust) from the Roosevelt Island Climate Evolution (RICE) ice core. We focus on the glacial period from 83 to 26 kilo years Before Present (ka BP). The data show a statistically significant correlation between NO 3 − and nssCa2+ over this period. To put our findings into a spatial context, we compare RICE data with existing records from east Antarctica (EPICA Dome C [EDC], Vostok and central Dome Fuji) and West Antarctica (West Antarctic Ice Sheet Divide Ice Core [WDC]). Spatial analysis suggests that nssCa2+ is contributing to the effective scavenging of NO 3 − from the atmosphere perhaps through the formation of calcium nitrate (Ca(NO 3) 2). The geographic pattern implies that the process of Ca(NO 3) 2 formation occurs during the long-distance transport of mineral dust from mid-latitude source regions by Southern Hemisphere Westerly Winds (SHWW). The data also suggest that the correlation observed at various Antarctic locations may depend on the level of dust reaching the sites from the mid-latitude sources. • A new Antarctic coastal record for mineral dust and nitrate for the last glacial. • Mineral dust-nitrate association is an Antarctic wide phenomenon during the glacial. • Mineral dust scavenges nitrate from the atmosphere. • Dust bound nitrate is dispersed to Antarctic atmosphere by westerly winds. • Scavenging efficiency increases when the atmospheric dust loading is high. [ABSTRACT FROM AUTHOR]
Copyright of Global & Planetary Change is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Role of mineral dust in the nitrate preservation during the glacial period: Insights from the RICE ice core.
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  Data: <searchLink fieldCode="AR" term="%22Venugopal%2C+Abhijith+U%2E%22">Venugopal, Abhijith U.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> abhi.ulayottilvenugopal@vuw.ac.nz</i><br /><searchLink fieldCode="AR" term="%22Bertler%2C+Nancy+A%2EN%2E%22">Bertler, Nancy A.N.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pyne%2C+Rebecca+L%2E%22">Pyne, Rebecca L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kjær%2C+Helle+A%2E%22">Kjær, Helle A.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Winton%2C+V%2E+Holly+L%2E%22">Winton, V. Holly L.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mayewski%2C+Paul+A%2E%22">Mayewski, Paul A.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cortese%2C+Giuseppe%22">Cortese, Giuseppe</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="DE" term="%22Glaciation%22">Glaciation</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+cores%22">Ice cores</searchLink><br /><searchLink fieldCode="DE" term="%22Mineral+dusts%22">Mineral dusts</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrate+minerals%22">Nitrate minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Dust%22">Dust</searchLink><br /><searchLink fieldCode="DE" term="%22Westerlies%22">Westerlies</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Antarctica%22">Antarctica</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Nitrate (NO 3 −), an abundant aerosol in polar snow, is a complex environmental proxy to interpret owing to its diverse sources and susceptibility to post-depositional processes. During the last glacial period, when dust concentrations in the Antarctic ice were upto ~50 times than today, mineral dust appears to have a stabilizing effect on the NO 3 − concentration in snow. However, the mechanism leading to the stabilization remains unclear. Here, we present the new and highly resolved records of NO 3 − and non-sea salt calcium (nssCa2+, a proxy for mineral dust) from the Roosevelt Island Climate Evolution (RICE) ice core. We focus on the glacial period from 83 to 26 kilo years Before Present (ka BP). The data show a statistically significant correlation between NO 3 − and nssCa2+ over this period. To put our findings into a spatial context, we compare RICE data with existing records from east Antarctica (EPICA Dome C [EDC], Vostok and central Dome Fuji) and West Antarctica (West Antarctic Ice Sheet Divide Ice Core [WDC]). Spatial analysis suggests that nssCa2+ is contributing to the effective scavenging of NO 3 − from the atmosphere perhaps through the formation of calcium nitrate (Ca(NO 3) 2). The geographic pattern implies that the process of Ca(NO 3) 2 formation occurs during the long-distance transport of mineral dust from mid-latitude source regions by Southern Hemisphere Westerly Winds (SHWW). The data also suggest that the correlation observed at various Antarctic locations may depend on the level of dust reaching the sites from the mid-latitude sources. • A new Antarctic coastal record for mineral dust and nitrate for the last glacial. • Mineral dust-nitrate association is an Antarctic wide phenomenon during the glacial. • Mineral dust scavenges nitrate from the atmosphere. • Dust bound nitrate is dispersed to Antarctic atmosphere by westerly winds. • Scavenging efficiency increases when the atmospheric dust loading is high. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Global & Planetary Change is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.gloplacha.2022.103745
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Glaciation
        Type: general
      – SubjectFull: Ice cores
        Type: general
      – SubjectFull: Mineral dusts
        Type: general
      – SubjectFull: Nitrate minerals
        Type: general
      – SubjectFull: Dust
        Type: general
      – SubjectFull: Westerlies
        Type: general
      – SubjectFull: Antarctica
        Type: general
    Titles:
      – TitleFull: Role of mineral dust in the nitrate preservation during the glacial period: Insights from the RICE ice core.
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              M: 02
              Text: Feb2022
              Type: published
              Y: 2022
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