Relationships between spectroscopic properties of high‐altitude organic aerosols and Sun photometry from ground‐based remote sensing

Mladenov, Natalie; Reche, Isabel; Olmo, F.J.; Lyamani, H.; Alados-Arboledas, L.

doi:10.1029/2009jg000991

Cited by 29 publications

(25 citation statements)

References 72 publications

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“…At the end of the study period, 109 samples were collected. Despite the complexity in the collection of dry atmospheric deposition (Wesely and Hicks, 2000), the comparatively large size of Saharan dust aerosol (supramicrons) (Alados-Arboledas et al, 2003;Mladenov et al, 2010) that are submitted to long-range transport (Prospero, 1996) makes that sedimentation is the main delivery process and likely unaffected by the specific collector properties. Nevertheless, the fluxes of some elements with gaseous compounds as N and S may be underestimated with this procedure.…”

Section: Sampling and Chemical Analysesmentioning

confidence: 99%

Chemical signature of Saharan dust on dry and wet atmospheric deposition in the south-western Mediterranean region

Morales‐Baquero

Pulido-Villena

Reche

2013

Tellus B: Chemical and Physical Meteorology

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We studied if the presence of Saharan dust intrusions and the rains modify the chemical signature of the wet and dry deposition in the southern Iberian Peninsula. We have sorted the 109 sampling weeks by the presence (rainy weeks) or absence (dry weeks) of rain and by the occurrence or not of Saharan dust intrusions. Dry deposition dominated the delivery of particulate material (PM), total phosphorus (TP), soluble reactive phosphorus (SRP), Ca2+, Mg2+ and K+, whereas wet deposition dominated the delivery of Na+, total nitrogen, and. In the dry weeks, the presence of Saharan dust intrusions lead to higher inputs of PM, TP, SRP, Ca2+, Mg2+ and K+ in the dry deposition. Conversely, in the rainy weeks, there were no differences in mean values of dry deposition irrespective of the occurrence of Saharan dust intrusions. Nevertheless, in the presence of Saharan intrusions and some rain, the weekly collection of PM, TP and Ca2+ in dry deposition were significantly higher and increased as rainfall was lower. By contrast, the ions Cl– and Na+ in wet deposition were higher in absence of Saharan dust intrusion and increased as rainfall increased

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Section: Sampling and Chemical Analysesmentioning

confidence: 99%

Chemical signature of Saharan dust on dry and wet atmospheric deposition in the south-western Mediterranean region

Morales‐Baquero

Pulido-Villena

Reche

2013

Tellus B: Chemical and Physical Meteorology

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“…Precipitation has been shown to be an important C input for carbon-poor environments, such as coastal areas (Kieber et al, 2006(Kieber et al, , 2007 and the open ocean (Willey et al, 2000, Economu and Mihalopoulos, 2002, Jurado et al, 2008. For alpine environments, Litaor (1987) and Ley et al (2004) in the Colorado Rocky Mountains and more recently Mladenov et al (2009Mladenov et al ( , 2010 in the Sierra Nevada of Spain reported that aeolian deposition comprised about 10 % to 20 % organic C. Lawrence et al (2010) also found surprisingly high organic C content in dust deposition. Mladenov et al (2009) used spectroscopic techniques (UV-vis absorbance and fluorescence) in combination with air mass backward trajectories to demonstrate that water soluble organic carbon (WSOC) from dust emitted in Africa and deposited at an alpine site in Spain contained substantial amounts of humic-like fluorescent compounds.…”

Section: N Mladenov Et Al: Atmospheric Deposition As a Source Of Camentioning

confidence: 99%

Atmospheric deposition as a source of carbon and nutrients to an alpine catchment of the Colorado Rocky Mountains

et al. 2012

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Abstract. Many alpine areas are experiencing deglaciation, biogeochemical changes driven by temperature rise, and changes in atmospheric deposition. There is mounting evidence that the water quality of alpine streams may be related to these changes, including rising atmospheric deposition of carbon (C) and nutrients. Given that barren alpine soils can be severely C limited, atmospheric deposition sources may be an important source of C and nutrients for these environments. We evaluated the magnitude of atmospheric deposition of C and nutrients to an alpine site, the Green Lake 4 catchment in the Colorado Rocky Mountains. Using a long-term dataset (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) of weekly atmospheric wet deposition and snowpack chemistry, we found that volume weighted mean dissolved organic carbon (DOC) concentrations were 1.12 ± 0.19 mg l −1 , and weekly concentrations reached peaks as high at 6-10 mg l −1 every summer. Total dissolved nitrogen concentration also peaked in the summer, whereas total dissolved phosphorus and calcium concentrations were highest in the spring. To investigate potential sources of C in atmospheric deposition, we evaluated the chemical quality of dissolved organic matter (DOM) and relationships between DOM and other solutes in wet deposition. Relationships between DOC concentration, fluorescence, and nitrate and sulfate concentrations suggest that pollutants from nearby urban and agricultural sources and organic aerosols derived from sub-alpine vegetation may influence high summer DOC wet deposition concentrations. Interestingly, high DOC concentrations were also recorded during "dust-in-snow" events in the spring, which may reflect an association of DOM with dust. Detailed chemical and spectroscopic analyses conducted for samples collected in 2010 revealed that the DOM in many late spring and summer samples was less aromatic and polydisperse and of lower molecular weight than that of winter and fall samples. Our C budget estimates for the Green Lake 4 catchment illustrated that wet deposition (9.9 kg C ha −1 yr −1 ) and dry deposition (6.9 kg C ha −1 yr −1 ) were a combined input of approximately 17 kg C ha −1 yr −1 , which could be as high as 24 kg C ha −1 yr −1 in high dust years. This atmospheric C input approached the C input from microbial autotrophic production in barren soils. Atmospheric wet and dry deposition also contributed 4.3 kg N ha −1 yr −1 , 0.15 kg P ha −1 yr −1 , and 2.7 kg Ca 2+ ha −1 yr −1 to this alpine catchment.

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“…[5,6] In addition, the WSOM can significantly contribute to the absorption of solar radiation, and thus atmospheric heating and global climate change. [7][8][9] Furthermore, the wet deposition fluxes of atmospheric WSOM indicates that it may be an important temporal source of OC to surface waters and likely plays a vital role in the global carbon cycle. [10] Our understanding of the fate and impacts of aerosol WSOM on the climate and human health is limited by the uncertainty surrounding their mechanisms of formation, sources as well as source-related properties.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the structural features of organic aerosols by NMR spectroscopy: a review

Duarte

2015

Magnetic Reson in Chemistry

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Our limited understanding of the effect of organic aerosols (OAs) on the climate and human health is largely because of the vast array of formation processes and sources that produce a multitude of molecular structures and physical properties. The need to unravel the enormous complexity and heterogeneity of OAs and thus understand their effects on the climate and human health has led to the development of different off-line methods based on the use of advanced analytical techniques. Within this context, nuclear magnetic resonance (NMR) spectroscopy has become essential for acquiring detailed structural characterization of the complex natural organic matter contained in atmospheric aerosols. In this article, we present a critical review on the application of NMR spectroscopy in OAs (primary and secondary) studies, focusing mainly on the water-soluble organic fraction, and how NMR has impacted our knowledge on atmospheric organic matter. A major emphasis is given on the wealth of chemical information that solid-state and multi-dimensional solution-state NMR can provide, including the sources, formation pathways, seasonal, and regional characterization of atmospheric OAs. Finally, major challenges are discussed and recommendations for future research directions are proposed.

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Relationships between spectroscopic properties of high‐altitude organic aerosols and Sun photometry from ground‐based remote sensing

Cited by 29 publications

References 72 publications

Chemical signature of Saharan dust on dry and wet atmospheric deposition in the south-western Mediterranean region

Chemical signature of Saharan dust on dry and wet atmospheric deposition in the south-western Mediterranean region

Atmospheric deposition as a source of carbon and nutrients to an alpine catchment of the Colorado Rocky Mountains

Unraveling the structural features of organic aerosols by NMR spectroscopy: a review

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