Transport of Patagonian dust to Antarctica

Li, Fuyu; Ginoux, Paul; Ramaswamy, V.

doi:10.1029/2009jd012356

Cited by 62 publications

(73 citation statements)

References 27 publications

(40 reference statements)

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“…The forward-trajectory clusters revealed that both during summer (NP: 66 %; GD: 80 %) and winter (NP: 48 %; GD: 42 %), dust-laden air parcels generally circulate towards south and east from dust sources. The back-trajectory clusters revealed, in line with previous studies (Li et al, 2008(Li et al, , 2010, that the majority of air parcels at 1500 m level invariably arrived from regions that are influenced by the air parcels from SSA region. These air parcels ultimately get incorporated into the Antarctic circumpolar vortex (ACV) before mass compensation by anticyclonic polar easterlies in the East Antarctic region (Dixon et al, 2012).…”

Section: Mineral Dust Reactivity and Possible Remote Sourcessupporting

confidence: 73%

“…Furthermore, particle size analyses of dust from snow cores in coastal, mountainous, and inland sections of both cDML and PEL transects showed that > 90 % of particles were < 4 µm and the majority of them in the ∼ 1 µm size range, indicating a distant dust source as demonstrated by model studies (e.g. Li et al, 2008Li et al, , 2010.…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, laboratory studies have shown that N 2 O 5 hydrolysis on mineral dust particles is enhanced in the presence of higher relative humidity (Mogili et al, 2006). Several ice core and model studies have demonstrated that certain regions in SSA like northern Patagonia, Puna Altiplano, and San Julian's Great Depression (GD) are the main dust-emitting sources to East Antarctica (Gaiero, 2007;Lambert et al, 2008;Li et al, 2008Li et al, , 2010. Studies based on large volumes of surface snow samples at Berkner Island by Bory et al (2010) also showed that the SSA is the dominant dust source in the Atlantic sector of Antarctica.…”

Section: Mineral Dust Reactivity and Possible Remote Sourcesmentioning

confidence: 99%

“…5). The forward trajectories were calculated from two prominent dust-emitting hotspots in the SSA region (Li et al, 2010), the North Patagonia (44 • S, 67 • W; NP in Fig. 5), and San Julian's GD (49 • S, 69 • W; GD in Fig.…”

Section: Mineral Dust Reactivity and Possible Remote Sourcesmentioning

confidence: 99%

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Potential genesis and implications of calcium nitrate in Antarctic snow

Mahalinganathan

Thamban

2016

The Cryosphere

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Abstract.Among the large variety of particulates in the atmosphere, calcic mineral dust particles have highly reactive surfaces that undergo heterogeneous reactions with atmospheric acids contiguously. The association between nssCa 2+ , an important proxy indicator of mineral dust, and NO − 3 , a dominant anion in the Antarctic snowpack, was analysed. A total of 41 snow cores (∼ 1 m each) that represent snow deposited during 2008-2009 were studied along coastal-inland transects from two different regions in East Antarctica -the Princess Elizabeth Land (PEL) and central Dronning Maud Land (cDML). Correlation statistics showed a strong association (at 99 % significance level) between NO − 3 and nssCa 2+ at the near-coastal sections of both PEL (r = 0.74) and cDML (r = 0.82) transects. Similarly, a strong association between these ions was also observed in snow deposits at the inland sections of PEL (r = 0.73) and cDML (r = 0.84). Such systematic associations between nssCa 2+ and NO − 3 are attributed to the interaction between calcic mineral dust and nitric acid in the atmosphere, leading to the formation of calcium nitrate (Ca(NO 3 ) 2 ) aerosol. Principal component analysis revealed common transport and depositional processes for nssCa 2+ and NO − 3 both in PEL and cDML. Forward-and back-trajectory analyses using HYS-PLIT model v. 4 revealed that southern South America (SSA) was an important dust-emitting source to the study region, aided by the westerlies. Particle size distribution showed that over 90 % of the dust was in the range < 4 µm, indicating that these dust particles reached the Antarctic region via longrange transport from the SSA region. We propose that the association between nssCa 2+ and NO − 3 occurs during the longrange transport due to the formation of Ca(NO 3 ) 2 rather than to local neutralisation processes. However, the influence of local dust sources from the nunataks in cDML and the contribution of high sea salt in coastal PEL evidently mask such association in the mountainous and coastal regions respectively. Ionic balance calculations showed that 70-75 % of NO

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Section: Mineral Dust Reactivity and Possible Remote Sourcessupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Mineral Dust Reactivity and Possible Remote Sourcesmentioning

confidence: 99%

Section: Mineral Dust Reactivity and Possible Remote Sourcesmentioning

confidence: 99%

See 2 more Smart Citations

Potential genesis and implications of calcium nitrate in Antarctic snow

Mahalinganathan

Thamban

2016

The Cryosphere

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“…Trajectory studies demonstrate that dust is transported eastward by moving low-pressure systems. Today, this takes about 7 days from Patagonia to East Antarctica (Li et al, 2010) on pathways crossing the Scotia Sea ( Fig. 1; Reijmer et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Periodic 1.5 ka climate variations during MIS 2 in the belt of Southern Hemispheric westerlies

Kliem¹,

Baumgarten

Gebhardt

et al. 2017

Quat. res.

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Lacustrine sediments retrieved from Laguna Potrok Aike in the framework of the Potrok Aike Maar Lake Sediment Archive Drilling Project (PASADO) offer the possibility to investigate climate variations of the past~51 cal ka BP in Southern Hemispheric midlatitudes, Argentinean Patagonia. This study focuses on short-term cyclicities in the Ca and magnetic susceptibility data sets between 51 and 15 cal ka BP. The record yields a climate pattern with a periodicity of 1.5 ka during Marine Oxygen Isotope Stage 2 (MIS 2) detected in the Southern Hemisphere from 31 to 17 cal ka BP for the first time. MIS 2 is known for constantly cold temperatures, whereas prominent climate variations paced by a 1.5 ka periodicity occurred during MIS 3. Our study documents that minor latitudinal oscillations of the Southern Hemispheric westerlies and the polar easterlies with a 1.5 ka periodicity also took place during MIS 2. However, we assume that because of a major northward displacement of the Southern Hemispheric westerlies, these oscillations did not sufficiently affect the zone of Circumpolar Deep Waters and an increased greenhouse effect by upwelling of CO 2 -rich deep waters did not occur. This mechanism illustrates why prominent climate events fail to appear during MIS 2.

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Trajectory modeling of modern dust transport to the Southern Ocean and Antarctica

2015

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Aerosol deposition over the Southern Ocean and Antarctica has the potential to alter marine productivity and thus ocean carbon uptake while also impacting radiative balance due to scattering and absorption from atmospheric particulates. Quantification of modern emission, transport, and deposition of terrestrial dust and other airborne material from Southern Hemisphere sources is challenging due to low emission levels and poor detection from remote sensing platforms. Here forward trajectory modeling is used to explore atmospheric transport, independent of deposition processes, from 1979 to 2013. Trajectories are initiated from known arid dust source areas in South America (Patagonia), Australia, and southern Africa, with detailed consideration of New Zealand as a potential source. Results suggest that Patagonian and New Zealand dust and other aerosol emissions share strong atmospheric transport during all seasons, allowing even potentially small New Zealand emissions to contribute significantly to Southern Ocean and Antarctic aerosol loading. We find that atmospheric transport controlling distribution of dust and other aerosols shows distinct spatial variability. New Zealand and Patagonia rapidly contribute a high proportion of trajectories to West Antarctica, while in interior East Antarctica, source contributions are limited and highly mixed. The sensitivity of existing deep ice core sites to modern atmospheric transport is discussed. Finally, interannual variability of poleward trajectory extension over the Pacific and Atlantic sectors of the Southern Ocean highlights the association of both tropical Pacific sea‐surface temperature and high‐latitude wind variability (e.g., the Southern Annular Mode) with transport of dust and other aerosols to the Southern Ocean and Antarctica.

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Transport of Patagonian dust to Antarctica

Cited by 62 publications

References 27 publications

Potential genesis and implications of calcium nitrate in Antarctic snow

Potential genesis and implications of calcium nitrate in Antarctic snow

Periodic 1.5 ka climate variations during MIS 2 in the belt of Southern Hemispheric westerlies

Trajectory modeling of modern dust transport to the Southern Ocean and Antarctica

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