Apportionment of black carbon in the South Shetland Islands, Antarctic Peninsula

Pereira, Ênio Bueno; Evangelista, Heitor; Pereira, Kely Cristine Dalia; Cavalcanti, Iracema F. A.; Setzer, Alberto

doi:10.1029/2005jd006086

Cited by 68 publications

(79 citation statements)

References 34 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 7a presents a trajectory density plot derived from HYSPLIT back trajectories corresponding to high-radon concentrations (> 400 mBq m −3 ). While Pereira et al (2006) reported transport to Ferraz from as far north as Brazil (with radon > 2000 mBq m −3 ), KSG high-radon events in 2013 were typically the result of slow-moving air masses crossing South America between 47 and 55 • S. In terms of potential anthropogenic pollutant sources, this fetch region includes several population centres of small-to-intermediate size, including Punta Arenas (population ca. 123 000).…”

Section: Intermediate Events (Hourly Concentrations 100-400 Mbq M −3 );mentioning

confidence: 99%

“…While numerous studies have already used radon to assist with the interpretation of trace species transported to, or produced within, the Antarctic atmosphere (Gros et al, 1998;Winkler, 1992;Murphey and Hogan, 1992;Wyputta, 1997;Pereira et al, 2004Pereira et al, , 2006, few of the published data sets have provided continuous, direct (i.e. not via progeny), long-term, highsensitivity radon observations, with hourly temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, since the climate and ecology of Antarctica is highly sensitive to anthropogenic influence (e.g. Steig and Orsi, 2013;Heffernan, 2012;Pereira et al, 2006), there is growing interest in quantifying the magnitude and source regions of pollutants affecting this pristine region (e.g. Jones et al, 2008;Pereira et al, 2004;Jacobi et al, 2000;Berresheim and Eisele, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Dumont d'Urville. Pereira (1990); Pereira et al (2004); Pereira et al (2006) Direct (electrostatic deposition)…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterising terrestrial influences on Antarctic air masses using Radon-222 measurements at King George Island

et al. 2014

View full text Add to dashboard Cite

Abstract. We report on one year of high-precision direct hourly radon observations at King Sejong Station (King George Island) beginning in February 2013. Findings are compared with historic and ongoing radon measurements from other Antarctic sites. Monthly median concentrations reduced from 72 mBq m −3 in late-summer to 44 mBq m −3 in late winter and early spring. Monthly 10th percentiles, ranging from 29 to 49 mBq m −3 , were typical of oceanic baseline values. Diurnal cycles were rarely evident and local influences were minor, consistent with regional radon flux estimates one tenth of the global average for ice-free land. The predominant fetch region for terrestrially influenced air masses was South America (47-53 • S), with minor influences also attributed to aged Australian air masses and local sources. Plume dilution factors of 2.8-4.0 were estimated for the most terrestrially influenced (South American) air masses, and a seasonal cycle in terrestrial influence on tropospheric air descending at the pole was identified and characterised.

show abstract

Section: Intermediate Events (Hourly Concentrations 100-400 Mbq M −3 );mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Dumont d'Urville. Pereira (1990); Pereira et al (2004); Pereira et al (2006) Direct (electrostatic deposition)…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterising terrestrial influences on Antarctic air masses using Radon-222 measurements at King George Island

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Indeed: (1) they are three persistent dust sources in South America: the first one is located, farther north, in the Bolivian Altiplano (19 -20°S, 67-68°W), and the two others are located in central Patagonia (Argentina), roughly encompassed by [37 -45°S, 66-70°W] and by [27 -34°S, 67 -70°W]. Preferential dust mobilization is observed from September to February [Prospero et al, 2002], when the cloud cover vanishes and aridity increases [Paruelo et al, 1998;Diaz et al, 2006]; (2) although the main wind direction at 45°S is westward over Patagonia, calm events occur mostly in winter but also in summer, a southerly component is evident in summer [Paruelo et al, 1998], and occasional strong wind events from Eastern sector occur throughout the year over semi-arid areas of central east Patagonia [$11% of major wind events, Labraga, 1994]; (3) Meridional transport of black carbon from tropical burning areas in Brazil to the northern Antarctic Peninsula has also been evidenced and related to intermittent mechanism involving the low-level jets east of Andes, the displacement eastward of frontal systems passing over Drake Passage and the high pressure over the Atlantic Ocean associated with the subtropical height [Pereira et al, 2006]. Andean summital areas are on the boarder of such southward flow.…”

Section: Calcium Seasonal Cycles Countingmentioning

confidence: 99%

A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by a shallow firn core from Monte San Valentín (Northern Patagonia Icefield, Chile)

et al. 2008

View full text Add to dashboard Cite

International audienceThe study of past climate variability from ice core investigations has been largely developed both in polar areas over the past decades and, more recently, in tropical regions, specifically along the South American Andes between 0° and 20°S. However a large gap still remains at mid-latitudes in the Southern Hemisphere. In this framework, a 15.3-m long shallow firn core has been extracted in March 2005 from the summit plateau of Monte San Valentín (3747 m, 46°35′S, 73°19′W) in the Northern Patagonia Icefield to test its potential for paleoclimate and paleoenvironmental reconstructions. The firn temperature is −11.9°C at 10-m depth allowing to expect well preserved both chemical and isotopic signals, unperturbed by water percolation. The dating of the core, on the basis of a multi-proxy approach combining annual layer counting and radionuclide measurements, shows that past environment and climate can be reconstructed back to the mid-1960s. A mean annual snow accumulation rate of 36 ± 3 cm year−1 (i.e., 19 ± 2 g cm−2 year−1) is inferred, with a snow density varying between 0.35 and 0.6 g cm−3, which is much lower than accumulation rates previously reported in Patagonia at lower elevations. Here, we present and discuss high-resolution profiles of the isotopic composition of the snow and selected chemical markers. These data provide original information on environmental conditions prevailing over Southern Patagonia in terms of air masses trajectories and origins and biogeochemical reservoirs. Our main conclusion is that the San Valentín site is not only influenced by air masses originating from the southern Pacific and directly transported by the prevailing west winds but also by inputs from South American continental sources from the E–NE, sometimes mixed with circumpolar aged air masses, the relative influence of these two very distinct source areas changing at the interannual timescale. Thus this site should offer a wealth of information regarding (South) Pacific, Argentinian NE–E areas and Antarctic climate variability

show abstract

Holocene black carbon in Antarctica paralleled Southern Hemisphere climate

et al. 2017

View full text Add to dashboard Cite

Black carbon (BC) and other biomass‐burning (BB) aerosols are critical components of climate forcing, but quantification, predictive climate modeling, and policy decisions have been hampered by limited understanding of the climate drivers of BB and by the lack of long‐term records. Prior modeling studies suggested that increased Northern Hemisphere anthropogenic BC emissions increased recent temperatures and regional precipitation, including a northward shift in the Intertropical Convergence Zone (ITCZ). Two Antarctic ice cores were analyzed for BC, and the longest record shows that the highest BC deposition during the Holocene occurred ~8–6 k years before present in a period of relatively high austral burning season and low growing season insolation. Atmospheric transport modeling suggests South America (SA) as the dominant source of modern Antarctic BC and, consistent with the ice core record, climate model experiments using mid‐Holocene and preindustrial insolation simulate comparable increases in carbon loss due to fires in SA during the mid‐Holocene. SA climate proxies document a northward shifted ITCZ and weakened SA Summer Monsoon (SASM) during this period, with associated impacts on hydroclimate and burning. A second Antarctic ice core spanning the last 2.5 k years documents similar linkages between hydroclimate and BC, with the lowest deposition during the Little Ice Age characterized by a southerly shifted ITCZ and strengthened SASM. These new results indicate that insolation‐driven changes in SA hydroclimate and BB, likely linked to the position of the ITCZ, modulated Antarctic BC deposition during most of the Holocene and suggests connections and feedbacks between future BC emissions and hydroclimate.

show abstract

Apportionment of black carbon in the South Shetland Islands, Antarctic Peninsula

Cited by 68 publications

References 34 publications

Characterising terrestrial influences on Antarctic air masses using Radon-222 measurements at King George Island

Characterising terrestrial influences on Antarctic air masses using Radon-222 measurements at King George Island

A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by a shallow firn core from Monte San Valentín (Northern Patagonia Icefield, Chile)

Holocene black carbon in Antarctica paralleled Southern Hemisphere climate

Contact Info

Product

Resources

About