Role of mineral dust in the nitrate preservation during the glacial period: Insights from the RICE ice core
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Role of mineral dust in the nitrate preservation during the glacial period : Insights from the RICE ice core. / Venugopal, Abhijith U.; Bertler, Nancy A. N.; Pyne, Rebecca L.; Kjaer, Helle A.; Winton, V. Holly L.; Mayewski, Paul A.; Cortese, Giuseppe.
I: Global and Planetary Change, Bind 209, 103745, 01.02.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Role of mineral dust in the nitrate preservation during the glacial period
T2 - Insights from the RICE ice core
AU - Venugopal, Abhijith U.
AU - Bertler, Nancy A. N.
AU - Pyne, Rebecca L.
AU - Kjaer, Helle A.
AU - Winton, V. Holly L.
AU - Mayewski, Paul A.
AU - Cortese, Giuseppe
PY - 2022/2/1
Y1 - 2022/2/1
N2 - Nitrate (NO3-), 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 similar to 50 times than today, mineral dust appears to have a stabilizing effect on the NO3- concentration in snow. However, the mechanism leading to the stabilization remains unclear. Here, we present the new and highly resolved records of NO3- and non-sea salt calcium (nssCa(2+), 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 NO3- and nssCa(2+) 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 nssCa(2+) is contributing to the effective scavenging of NO3- from the atmosphere perhaps through the formation of calcium nitrate (Ca(NO3)(2)). The geographic pattern implies that the process of Ca(NO3)(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.
AB - Nitrate (NO3-), 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 similar to 50 times than today, mineral dust appears to have a stabilizing effect on the NO3- concentration in snow. However, the mechanism leading to the stabilization remains unclear. Here, we present the new and highly resolved records of NO3- and non-sea salt calcium (nssCa(2+), 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 NO3- and nssCa(2+) 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 nssCa(2+) is contributing to the effective scavenging of NO3- from the atmosphere perhaps through the formation of calcium nitrate (Ca(NO3)(2)). The geographic pattern implies that the process of Ca(NO3)(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.
KW - RICE ice core
KW - Last glacial period
KW - Mineral dust-nitrate coupling
KW - Nitrate scavenging
KW - Atmospheric process
KW - A new coastal record
KW - CONTINUOUS-FLOW ANALYSIS
KW - DOME C
KW - NITRIC-ACID
KW - ISOTOPIC CONSTRAINTS
KW - SCALE VARIABILITY
KW - ROOSEVELT ISLAND
KW - SOUTHERN-OCEAN
KW - ROSS SEA
KW - SNOW
KW - ANTARCTICA
U2 - 10.1016/j.gloplacha.2022.103745
DO - 10.1016/j.gloplacha.2022.103745
M3 - Journal article
VL - 209
JO - Global and Planetary Change
JF - Global and Planetary Change
SN - 0921-8181
M1 - 103745
ER -
ID: 302387829