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Author: Elvis Torres Delgado Publisher: ISBN: Category : Absorption Languages : en Pages : 123
Book Description
Aerosols can interact with radiation directly through scattering and absorption and indirectly by serving as cloud condensation nuclei. The uncertainty of how particles and clouds interact with radiation is still high amidst the progress made in recent years, which hinders our current understanding of how these particles affect the Earth’s radiation budget. This works aims to reduce this uncertainty by targeting the two most light-absorbing atmospheric particles, mineral dust and black carbon, and study how they interact with radiation, how they serve as cloud condensation nuclei, assessing popular measurement techniques and evaluating their impact in two different tropical forest ecosystems. Field measurements were carried out in the Caribbean island of Puerto Rico and in the Brazilian Amazon. In Puerto Rico, aerosol-cloud interactions were studied in the tropical montane cloud forest (TMCF) of Pico del Este, which receives consistently during summer months the influence of mineral dust from the Sahara/Sahel region in Africa (i.e., African dust). In Brazil, specifically in the Amazon basin, measurements of black carbon were performed in the city of Manacapurú, an area exposed to the influence of urban and biomass burning pollution. At Pico del Este, periods of low and high dust influence were identified through the use of aerosol optical properties, and air mass trajectories (HYSPLIT). It was found out that African dust interacts with clouds and produces a higher number of droplets, but the mean droplet effective diameter is not significantly altered. Similarly, the deposition of water and nutrients through water and clouds was studied, and results suggests that rain is the main mechanism through where water is deposited to the ecosystem over clouds (58- 78%). Cloud water presented an enrichment of nutrients over rainwater, suggesting that clouds are more important than rain for supplying TMCFs with nutrients. At the Brazilian Amazon basin, an Aethalometer -the most popular technique for measuring black carbon concentrations through the absorption coefficient- was used and several corrections used to overcome known artefacts for this type of measurements were evaluated. Results suggests that this technique can overestimate the absorption coefficient by a factor of 5 and that the corrections do not agree well among each other.
Author: Elvis Torres Delgado Publisher: ISBN: Category : Absorption Languages : en Pages : 123
Book Description
Aerosols can interact with radiation directly through scattering and absorption and indirectly by serving as cloud condensation nuclei. The uncertainty of how particles and clouds interact with radiation is still high amidst the progress made in recent years, which hinders our current understanding of how these particles affect the Earth’s radiation budget. This works aims to reduce this uncertainty by targeting the two most light-absorbing atmospheric particles, mineral dust and black carbon, and study how they interact with radiation, how they serve as cloud condensation nuclei, assessing popular measurement techniques and evaluating their impact in two different tropical forest ecosystems. Field measurements were carried out in the Caribbean island of Puerto Rico and in the Brazilian Amazon. In Puerto Rico, aerosol-cloud interactions were studied in the tropical montane cloud forest (TMCF) of Pico del Este, which receives consistently during summer months the influence of mineral dust from the Sahara/Sahel region in Africa (i.e., African dust). In Brazil, specifically in the Amazon basin, measurements of black carbon were performed in the city of Manacapurú, an area exposed to the influence of urban and biomass burning pollution. At Pico del Este, periods of low and high dust influence were identified through the use of aerosol optical properties, and air mass trajectories (HYSPLIT). It was found out that African dust interacts with clouds and produces a higher number of droplets, but the mean droplet effective diameter is not significantly altered. Similarly, the deposition of water and nutrients through water and clouds was studied, and results suggests that rain is the main mechanism through where water is deposited to the ecosystem over clouds (58- 78%). Cloud water presented an enrichment of nutrients over rainwater, suggesting that clouds are more important than rain for supplying TMCFs with nutrients. At the Brazilian Amazon basin, an Aethalometer -the most popular technique for measuring black carbon concentrations through the absorption coefficient- was used and several corrections used to overcome known artefacts for this type of measurements were evaluated. Results suggests that this technique can overestimate the absorption coefficient by a factor of 5 and that the corrections do not agree well among each other.
Author: Kirill Ya. Kondratyev Publisher: Springer Science & Business Media ISBN: 3540376984 Category : Science Languages : en Pages : 595
Book Description
This book provides the first comprehensive analysis of how aerosols form in the atmosphere through in situ processes as well as via transport from the surface (dust storms, seas spray, biogenic emissions, forest fires etc.). Such an analysis has been followed by the consideration of both observation data (various field observational experiments) and numerical modeling results to assess climate impacts of aerosols bearing in mind that these impacts are the most significant uncertainty in studying natural and anthropogenic causes of climate change.
Author: Alexander A. Kokhanovsky Publisher: Springer Science & Business Media ISBN: 3540693971 Category : Science Languages : en Pages : 398
Book Description
Aerosols have a significant influence on the Earth's radiation budget, but there is considerable uncertainty about the magnitude of their effect on the Earth's climate. Currently, satellite remote sensing is being increasingly utilized to improve our understanding of the effect of atmospheric aerosols on the climate system. Satellite Aerosol Remote Sensing Over Land is the only book that brings together in one volume the most up-to-date research and advances in this discipline. As well as describing the current academic theory, the book presents practical applications, utilizing state-of-the-art instrumentation, invaluable to the work of environmental scientists. With contributions by an international group of experts and leaders of correspondent aerosol retrieval groups, the book is an essential tool for all those working in the field of climate change.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Aerosols influence Earth's heat budget both directly by scattering and absorbing sunlight, and indirectly by acting as nuclei for cloud droplets. To reduce the uncertainties of current estimates of aerosol climate forcing, aerosol optical properties relevant to the computation of direct radiative forcing were measured at a regionally representative site near Mount Mitchell, North Carolina. On the basis of these measurements and model calculations, we have studied (1) the effects of relative humidity (RH) on aerosol optical properties and direct aerosol radiative forcing and (2) the influence of long-range transport on black carbon (BC) concentrations, its seasonal and weekly patterns, and the effects of BC on the regional climate of the southeastern US. The light scattering of aerosol is strongly dependent on RH at which it is measured, due to hygroscopic growth nature of most atmospheric aerosols. In this study, the hygroscopic growth factor (ratio of total scattering coefficient at RH=80% to that at RH=30%) was calculated to be almost constant value of 1.60 +/- 0.01 for polluted, marine, and continental air masses. In addition, it was found that as the RH increased from 30% to 80%, the backscatter fraction decreased by 23%. The patterns of direct radiative climate forcing by aerosols for various values of RH were similar for the three air masses, but the magnitudes of the forcing were larger for polluted air masses than for marine and continental air masses by a factor of nearly 2 due to higher sulfate concentration in polluted air masses. The averaged forcing for all the observed ambient RHs was -2.9 W m^( -2) (the negative forcing of -3.2 by aerosol scattering plus the positive forcing of +0.3 by aerosol absorption) for polluted air masses, -1.4 W m^( -2) ( -1.5 plus +0.1) for marine air masses, and -1.5 W m^( -2) ( -1.6 plus +0.1) for continental air masses. The BC mass concentration of the southeastern US showed the highest average concentration in polluted air mas.
Author: Claudio Tomasi Publisher: John Wiley & Sons ISBN: 3527336435 Category : Science Languages : en Pages : 708
Book Description
Ein Blick auf die morphologischen, physikalischen und chemischen Eigenschaften von Aerosolen aus den unterschiedlichsten natürlichen und anthropogenen Quellen trägt zum besseren Verständnis der Rolle bei, die Aerosolpartikel bei der Streuung und Absorption kurz- und langwelliger Strahlung spielen. Dieses Fachbuch bietet Informationen, die sonst schwer zu finden sind, und vermittelt ausführlich die Kenntnisse, die erforderlich sind, um die mikrophysikalischen, chemischen und Strahlungsparameter zu charakterisieren, die bei der Wechselwirkung von Sonnen- und Erdstrahlen so überaus wichtig sind. Besonderes Augenmerk liegt auf den indirekten Auswirkungen von Aerosolen auf das Klima im Rahmen des komplexen Systems aus Aerosolen, Wolken und der Atmosphäre. Auch geht es vorrangig um die Wirkungen natürlicher und anthropogener Aerosole auf die Luftqualität und die Umwelt, auf die menschliche Gesundheit und unser kulturelles Erbe. Mit einem durchgängig lösungsorientierten Ansatz werden nicht nur die Probleme und Gefahren dieser Aerosole behandelt, sondern auch praktikable Lösungswege aufgezeigt.
Author: M. Kulmala Publisher: Elsevier ISBN: 0080537820 Category : Science Languages : en Pages : 995
Book Description
This volume is a collection of papers presented at the 14th International Conference on Nucleation and Atmospheric Aerosols, Helsinki, 26 - 30 August 1996. The first conference of this series took place in Dublin (1955); second, Basel and Locarno (1956); third, Cambridge (1958); fourth, Frankfurt am Main and Heidelberg (1961); fifth, Clermont-Ferrand and Tolouse (1963); sixth, Albany and University Park (1966); seventh, Prague and Vienna (1969); eighth, Leningrad (1973); ninth, Galway (1977); tenth, Hamburg (1981); eleventh Budapest (1984); twelfth, Vienna (1988); thirteenth, Salt Lake City (1992). The Atmospheric Aerosol conference has been held jointly with the Nucleation Symposium since 1988 in Vienna in order to stimulate contacts between researchers in these closely related fields. The broad nature of the meeting and the scientific program resulted in 32 countries submitting papers for presentation. Covering both experimental and theoretical studies these papers are divided amongst the chapters on Nucleation, Stratospheric Aerosols and Ice Nucleation, Tropospheric Aerosols and Aerosol-Cloud-Climate Interaction. In addition to these contributed papers invitations to present a plenary lecture on topics of particular current interest were accepted by P.J. Crutzen, J. Gras, J.L. Katz, A.A. Lushnikov, D. Oxtoby, J.E. Penner, Th. Peter, F. Raes, S.E. Schwartz, R. Strey and G. Vali. These plenary papers together with the contributed papers provide a well-balanced perspective of the current research over the entire field and highlight some important issues.
Author: Alyson Douglas Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
When aerosols enter the atmosphere through anthropogenic and natural activities, they interact with clouds in the atmosphere in what is termed aerosol-cloud interactions (ACI). ACI alter the cloud's radiative properties by acting as cloud condensation nuclei within the cloud, thereby reducing the mean drop size and increasing the cloud's albedo and cooling the earth by reflecting incoming shortwave radiation in what is termed the first indirect effect. By reducing the mean drop size throughout the cloud, aerosol also act to delay precipitation formation, leading to larger, longer lived clouds and further cooling the earth in a process known as the second indirect effect. Using four years of satellite observations, the overall impact of aerosols on warm cloud radiative effect is evaluated. Warm clouds are defined as clouds with cloud top temperatures below freezing level. The estimates are constrained within regimes of stability, relative humidity of the free atmosphere, and by the scene liquid water path to control for how meteorology modulates the strength and sign of ACI. The sum of the first and second indirect effect, estimates of how aerosols alter the warm cloud shortwave effect and cloud fraction, are compared to an estimate of the full indirect effect, which includes all changes to the warm cloud shortwave radiative effect. The decomposed, or summative, indirect effect (-0.26 +/- .15 Wm2) is less than the full indirect effect (-0.32 +/- .16 Wm2), though they lie within each other's uncertainty estimates. When the decomposed indirect effect is further constrained by precipitation, the estimate decreases to .21 +/- .15 Wm2. The difference between the full indirect effect forcing and the decomposed forcings may be secondary indirect effects not included in our decomposition. The second indirect effect includes not only the cloud extent broadening, but the cloud depth increasing. This deepening response may increase warming due to a larger longwave cloud radiative effect. The longwave indirect effect susceptibility is decomposed to determine how large it may potentially be and whether it could offset any cooling due to the shortwave indirect effect. We find the longwave indirect effect does have the potential to offset cooling through cloud deepening in regions where the shortwave indirect effect is extremely small, however the magnitude of the longwave component is sensitive to the diurnal cycle. Cloud deepening signals clouds may be invigorated, or experiencing a state where precipitation formation and turbulence increase due to ACI. The effects of aerosol on precipitation formation and vertical motion are investigated using WALRUS, an algorithm of latent heating within the cloud determined using CloudSat radar returns. The LWP is constrained to thicker clouds 150 gm2
Author: Panel on Aerosol Radiative Forcing and Climate Change Publisher: National Academies Press ISBN: 0309588871 Category : Science Languages : en Pages : 180
Book Description
This book recommends the initiation of an "integrated" research program to study the role of aerosols in the predicted global climate change. Current understanding suggest that, even now, aerosols, primarily from anthropogenic sources, may be reducing the rate of warming caused by greenhouse gas emissions. In addition to specific research recommendations, this book forcefully argues for two kinds of research program integration: integration of the individual laboratory, field, and theoretical research activities and an integrated management structure that involves all of the concerned federal agencies.
Author: Elvis Torres Delgado
Author: Elvis Torres Delgado
Author: Jost Heintzenberg
Author: Kirill Ya. Kondratyev
Author: Alexander A. Kokhanovsky
Author: 
Author: 
Author: Claudio Tomasi
Author: M. Kulmala
Author: Alyson Douglas
Author: Panel on Aerosol Radiative Forcing and Climate Change