Relationship between continuous aerosol measurements and firn core chemistry over a 10‐year period at the South Pole

Bergin, M. H.; Meyerson, E. A.; Dibb, Jack E.; Mayewski, Paul Andrew

doi:10.1029/98gl00854

Cited by 25 publications

(26 citation statements)

References 14 publications

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“…In such cases, clear signatures distinguish the air masses carrying coarse (sodium) and small (sulfate) particles, with sodium concentration peaks associated with flow from the Weddell and Ross sea regions [ Shaw , 1988]. By contrast, rather high summertime values of α are usually found, which can be explained in terms of the optical predominance of the fine sulfate particle mode [ Bergin et al , 1998].…”

Section: Aerosol Measurements In Antarcticamentioning

confidence: 99%

Aerosols in polar regions: A historical overview based on optical depth and in situ observations

et al. 2007

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[1] Large sets of filtered actinometer, filtered pyrheliometer and Sun photometer measurements have been carried out over the past 30 years by various groups at different Arctic and Antarctic sites and for different time periods. They were examined to estimate ensemble average, long-term trends of the summer background aerosol optical depth AOD(500 nm) in the polar regions (omitting the data influenced by Arctic haze and volcanic eruptions). The trend for the Arctic was estimated to be between À1.6% and À2.0% per year over 30 years, depending on location. No significant trend was observed for Antarctica. The time patterns of AOD(500 nm) and Å ngström's parameters a and b measured with Sun photometers during the last 20 years at various Arctic and Antarctic sites are also presented. They give a measure of the large variations of these parameters due to El Chichon, Pinatubo, and Cerro Hudson volcanic particles, Arctic haze episodes most frequent in winter and spring, and the transport of Asian dust and boreal smokes to the Arctic region. Evidence is also shown of marked differences between the aerosol optical parameters measured at coastal and high-altitude sites in Antarctica. In situ optical and chemical composition parameters of aerosol particles measured at Arctic and Antarctic sites are also examined to achieve more complete information on the multimodal size distribution shape parameters and their radiative properties. A characterization of aerosol radiative parameters is also defined by plotting the daily mean values of a as a function of AOD(500 nm), separately for the two polar regions, allowing the identification of different clusters related to fifteen aerosol classes, for which the spectral values of complex refractive index and single scattering albedo were evaluated. Citation: Tomasi, C., et al. (2007), Aerosols in polar regions: A historical overview based on optical depth and in situ observations,

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Section: Aerosol Measurements In Antarcticamentioning

confidence: 99%

Aerosols in polar regions: A historical overview based on optical depth and in situ observations

et al. 2007

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“…Antarctic aerosol chemical composition and physical properties such as size distributions and light scattering coefficients have been studied at several locations, both at coastal sites and in the interior parts of the continent for more than three decades [e.g., Fischer et al , 1969; Bodhaine and Bortniak , 1981; Shaw , 1988; Bergin et al , 1998]. For modeling the radiative effects of aerosols the refractive index of particles should be known.…”

Section: Introductionmentioning

confidence: 99%

Effective real refractive index of dry aerosols in the Antarctic boundary layer

Virkkula¹,

Koponen²,

Teinilä³

et al. 2006

Geophysical Research Letters

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The real refractive index (nr) of dry aerosols measured at an Antarctic site was calculated using two methods. Number size distributions were applied in a Mie model where nr was varied until the measured and modeled scattering coefficients matched. Ion concentrations analyzed from impactor samples were used for calculating size‐dependent nr. Generally the two methods were consistent with each other. The average iteration‐derived nr varied mainly between ∼1.4 and ∼1.5 but also unreasonably low values, nr < 1.3, were obtained in air masses from the ocean. Possible explanations, such as inaccuracies in the method, water in the particles, non‐analyzed biogenic particles, or non‐spherical particles being responsible for the low values are discussed.

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“…Since for most chemical species deposition to the snow surface occurs during the summer months [Bergin et al, 1998], these results raise some interesting new questions about the degree to which some species might be modified before being deposited at the surface. In conjunction with growing evidence that extensive oxidative processes are also occurring within the snowpack (i.e., fim) [e.g., Sumner and Shepson et al, 1999], the interpretation of the concentration levels of some climate proxy species in ice cores may need to be reexamined.…”

Section: Consequences Of Intense Sp Hox Chemistrymentioning

confidence: 99%

An investigation of South Pole HO_x chemistry: Comparison of model results with ISCAT observations

Chen¹,

Davis²,

Crawford³

et al. 2001

Geophysical Research Letters

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Abstract. Unexpected high levels of OH and NO were recorded at the South Pole (SP) Atmospheric Research Observatory during the 1998-99 ISCAT field study. Model simulations suggest a major photochemical linkage between observed OH and NO. A detailed comparison of the observations with model predictions revealed good agreement for OH at NO levels between 120 and 380 pptv. However, the model tended to overestimate OH for NO levels < 120 pptv, while it underestimated OH at levels > 380 pptv. The reasons for these deviations appear not to involve NO directly but rather HOx radical scavefiging for the low NO conditions and additional HOx sources for the high NO conditions. Because of the elevated levels of NO and highly activated HOx photochemistry, the SP was found to be a strong net source of surface ozone. It is quite likely that the strong oxidizing environment found at the South Pole extends over the entire polar plateau.

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Relationship between continuous aerosol measurements and firn core chemistry over a 10‐year period at the South Pole

Cited by 25 publications

References 14 publications

Aerosols in polar regions: A historical overview based on optical depth and in situ observations

Aerosols in polar regions: A historical overview based on optical depth and in situ observations

Effective real refractive index of dry aerosols in the Antarctic boundary layer

An investigation of South Pole HO_x chemistry: Comparison of model results with ISCAT observations

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Relationship between continuous aerosol measurements and firn core chemistry over a 10‐year period at the South Pole

Cited by 25 publications

References 14 publications

Aerosols in polar regions: A historical overview based on optical depth and in situ observations

Aerosols in polar regions: A historical overview based on optical depth and in situ observations

Effective real refractive index of dry aerosols in the Antarctic boundary layer

An investigation of South Pole HOx chemistry: Comparison of model results with ISCAT observations

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Product

Resources

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An investigation of South Pole HO_x chemistry: Comparison of model results with ISCAT observations