Marine aerosol source regions to Prince of Wales Icefield, Ellesmere Island, and influence from the tropical Pacific, 1979–2001

Criscitiello, Alison S.; Marshall, Shawn J.; Evans, Matthew J.; Kinnard, Christophe; Norman, Ann‐Lise; Sharp, Martin

doi:10.1002/2015jd024457

Cited by 9 publications

(15 citation statements)

References 69 publications

(106 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3b). This was similarly observed in samples collected from Devon Ice Cap in 2008(MacInnis et al, 2017, in North Atlantic pilot whales harvested between 1986 and 2013 (Dassuncao et al, 2017), and in Arctic air at Alert (Hung et al, 2016).…”

Section: Pfsa and Fosa Deposition And Temporal Trends On The Devon Icsupporting

confidence: 68%

Continuous non-marine inputs of per- and polyfluoroalkyl substances to the High Arctic: a multi-decadal temporal record

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract. Perfluoroalkyl acids (PFAAs) are persistent, in some cases, bioaccumulative compounds found ubiquitously within the environment. They can be formed from the atmospheric oxidation of volatile precursor compounds and undergo long-range transport (LRT) through the atmosphere and ocean to remote locations. Ice caps preserve a temporal record of PFAA deposition making them useful in studying the atmospheric trends in LRT of PFAAs in polar or mountainous regions, as well as in understanding major pollutant sources and production changes over time. A 15 m ice core representing 38 years of deposition (1977–2015) was collected from the Devon Ice Cap in Nunavut, providing us with the first multi-decadal temporal ice record in PFAA deposition to the Arctic. Ice core samples were concentrated using solid phase extraction and analyzed by liquid and ion chromatography methods. Both perfluoroalkyl carboxylic acids (PFCAs) and perfluoroalkyl sulfonic acids (PFSAs) were detected in the samples, with fluxes ranging from < LOD to 141 ng m−2 yr−1. Our results demonstrate that the PFCAs and perfluorooctane sulfonate (PFOS) have continuous and increasing deposition on the Devon Ice Cap, despite recent North American and international regulations and phase-outs. We propose that this is the result of on-going manufacture, use and emissions of these compounds, their precursors and other newly unidentified compounds in regions outside of North America. By modelling air mass transport densities, and comparing temporal trends in deposition with production changes of possible sources, we find that Eurasian sources, particularly from Continental Asia, are large contributors to the global pollutants impacting the Devon Ice Cap. Comparison of PFAAs to their precursors and correlations of PFCA pairs showed that deposition of PFAAs is dominated by atmospheric formation from volatile precursor sources. Major ion analysis confirmed that marine aerosol inputs are unimportant to the long-range transport mechanisms of these compounds. Assessments of deposition, homologue profiles, ion tracers, air mass transport models, and production and regulation trends allow us to characterize the PFAA depositional profile on the Devon Ice Cap and further understand the LRT mechanisms of these persistent pollutants.

show abstract

Section: Pfsa and Fosa Deposition And Temporal Trends On The Devon Icsupporting

confidence: 68%

Continuous non-marine inputs of per- and polyfluoroalkyl substances to the High Arctic: a multi-decadal temporal record

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The only exception to this is Prince of Wales Icefield in the Canadian Arctic, which our simulations suggest receives only 18% SISS. Previous studies suggest that the strong contribution of OOSS at this location results from the proximity of the North Water polynya (Criscitiello et al, 2016;Wasiuta et al, 2006).…”

Section: Origin Of Sea Salt In Arctic Snow: Sea Ice Surface or Open Omentioning

confidence: 75%

“…We regress simulated ice core annual mean Na concentrations from the BASE simulation against the annual mean sea ice area of each grid cell in the Arctic region (Figure S5). Annual mean Na values are used because seasonal values are often difficult to resolve in these high Arctic cores (e.g., Criscitiello et al, ). Most of the ice cores show only limited areas of significant ( p < 0.05) regression between Na and sea ice in distal locations where sea salt aerosol is unlikely to be sourced from.…”

Section: Discussionmentioning

confidence: 99%

Sea Ice Versus Storms: What Controls Sea Salt in Arctic Ice Cores?

Rhodes

Yang

Wolff

2018

Geophysical Research Letters

View full text Add to dashboard Cite

The sea ice surface is thought to be a major source of sea salt aerosol, suggesting that sodium records of polar ice cores may trace past sea ice extent. Here we test this possibility for the Arctic, using a chemical transport model to simulate aerosol emission, transport, and deposition in the satellite era. Our simulations suggest that sodium records from inland Greenland ice cores are strongly influenced by the impact of meteorology on aerosol transport and deposition. In contrast, sodium in coastal Arctic cores is predominantly sourced from the sea ice surface and the strength of these aerosol emissions controls the ice core sodium variability. Such ice cores may therefore record decadal to centennial scale Holocene sea ice changes. However, any relationship between ice core sodium and sea ice change may depend on how sea ice seasonality impacts sea salt emissions. Field‐based observations are urgently required to constrain this.

show abstract

“…At the end of each model trajectory simulation, all hourly trajectory locations situated over ocean were summed in discrete 1˚x1˚ bins and area-normalized to produce the marine-airmass transport density grids, nominally representing the relative probability that any given trajectory endpoint would be situated over a given grid-cell at any point along a trajectory. Due to the inherent concentric partitioning of trajectory end-points around the trajectory release point, each grid-cell within the transport density grid was then normalized by its inverse radial distance from the trajectory release point to remove its central tendency (Criscitiello et al, 2016). Finally, all airmass transport density grids were normalized on a 0 -1 (least to most probable) relative scale.…”

Section: Attribution Of Probable Msa Source Regionsmentioning

confidence: 99%

Greenlandic ice archives of North Atlantic Common Era climate

Osman¹

2019

View full text Add to dashboard Cite

Methanesulfonic acid (MSA; CH3SO3H) in polar ice is a unique proxy of marine primary productivity, synoptic atmospheric transport, and regional sea ice behavior. However, MSA can be mobile within the firn and ice matrix, a post-depositional process that is well known but poorly understood and documented, leading to uncertainties in the integrity of the MSA paleoclimatic signal. Here, we use a compilation of 22 ice core MSA records from Greenland and Antarctica and a model of soluble impurity transport in order to comprehensively investigate the vertical migration of MSA from summer layers, where MSA is originally deposited, to adjacent winter layers in polar ice.We find that the shallowest depths of MSA migration in our compilation vary over a wide range (~2 m to 400 m), and are positively correlated with snow accumulation rate and negatively correlated with ice concentration of Na + (typically the most abundant cationic sea salt). Although the considered soluble impurity transport model provides a useful mechanistic framework for studying MSA migration, it remains limited by inadequate constraints on key physico-chemical parameters, most notably, the diffusion coefficient of MSA in cold ice (5 67 ). We derive a simplified version of the model, which includes 5 67 as the sole parameter, in order to illuminate aspects of the migration process. Using this model, we show that the progressive phase alignment of MSA and Na + concentration peaks observed along a high-resolution West Antarctic core is most consistent with 10 -12 m 2 s -1 < 5 67 < 10 -11 m 2 s -1 , one order of magnitude greater than 5 67 values previously estimated from laboratory studies. More generally, our data synthesis and model results suggest that (i) MSA migration may be fairly ubiquitous, particularly at coastal and (or) high accumulation regions across Greenland and Antarctica, and (ii) can significantly change annual and multi-year MSA concentration averages. Thus, in most cases, caution should be exercised when interpreting polar ice core MSA 27 records, although records that have undergone severe migration could still be useful for inferring decadal and lower-frequency climate variability.

show abstract

Marine aerosol source regions to Prince of Wales Icefield, Ellesmere Island, and influence from the tropical Pacific, 1979–2001

Cited by 9 publications

References 69 publications

Continuous non-marine inputs of per- and polyfluoroalkyl substances to the High Arctic: a multi-decadal temporal record

Continuous non-marine inputs of per- and polyfluoroalkyl substances to the High Arctic: a multi-decadal temporal record

Sea Ice Versus Storms: What Controls Sea Salt in Arctic Ice Cores?

Greenlandic ice archives of North Atlantic Common Era climate

Contact Info

Product

Resources

About