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This thesis presents the development of four different remote-sensing instruments dedicated to atmospheric research and their use in field campaigns between 2008 and 2012. The instruments are based on uv-visible spectrometers and installed respectively on a scientific aircraft, ultralight aircraft, and cars. One of the instruments is targeted to operate from an Unmanned Aerial Vehicle (UAV). The Differential Optical Absorption Spectroscopy (DOAS) technique is used to quantify the molecular absorption in the spectra of scattered sky light. These absorptions are then interpreted by modeling the transfer of radiation in the atmosphere. Airborne platforms enable new measurement geometries, leading for instance to a high sensitivity in the free troposphere. On the other hand, a miniaturization effort is required, especially for the instruments onboard ultralight aircraft and UAV. Reaching the limited size, weight, and power consumption is possible through the use of compact spectrometers and computers, together with custom built electronics circuits and housings. A common target of the different experiments is to quantify tropospheric nitrogen dioxide (NO2). Regarding this trace gas, the developed instruments provide complementary findings, such as the vertical distribution in the pristine Arctic or the levels in the exhaust plumes of large cities like Riyadh. Car-borne measurements in North-West Europe reveal the horizontal gradients of surface NO2 at various scales. The UAV payload is intended to produce high spatial resolution maps of tropospheric NO2 columns.
Classic by noted art historian focuses on French cathedrals of the 13th century as apotheosis of medieval style. Iconography, bestiaries, illustrated calendars, gospels, secular history, many other aspects. 190 black-and-white illustrations.
Tropospheric ozone has long been recognized as a major environmental concern. Levels of ozone concentration have grown dramatically and the effects of ozone exposure have been examined in virtually thousands of studies worldwide. This timely new reference presents the state of the art in ozone regulation, human health effects, agricultural implications, and the economics of ozone reduction. Tropospheric Ozone guides you through the history of air pollution legislation and cites government initiatives to reduce ozone emissions. Ozone concentration data is supplied for a variety of geographic regions in examining the causes of ozone concentration and its potential effects on human populations, crops, and forests. Important issues such as crop yield, plant growth, and crop losses due to exposure are addressed, which will help develop an understanding of the economic implications of agricultural damage. New information is presented regarding risk assessment and human monitoring studies. EPA guidelines are reviewed, and potential health problems associated with ozone exposure are discussed in a practical, informative format. This valuable reference will benefit air pollution engineers, environmental consultants, government agency employees, regulators, industry professionals, health professionals, crop and soil scientists, environmental health and safety professionals, risk assessment professionals, and students in the environmental sciences.
A sumptuous survey of Mexico's foremost photographer Through more than 200 photographs, this luxurious volume presents Mexican photographer Graciela Iturbide's most iconic works alongside an important selection of previously unpublished photographs and a series of color photographs specially commissioned by the Fondation Cartier. Working mainly in black and white, Iturbide has explored the cohabitation between ancestral traditions and Catholic rites in Mexico, humanity's relationship with death and the roles of women in society. In recent years, her photographs have emptied themselves of human presence, revealing the enigmatic life of objects and nature. In addition to her stark images of her homeland, this book also includes images from her series in India, the United States and elsewhere. Heliotropo 37, named for the photographer's address in Mexico City, also contains an interview with the photographer by French essayist Fabienne Bradu, an original short story by Guatemalan writer Eduardo Halfon and a photo-portrait of Iturbide's studio by Mexican photographer Pablo López Luz. One of the most influential photographers active in Latin America today, Mexican photographer Graciela Iturbide (born 1942) began studying photography in the 1970s with legendary photographer Manuel Álvarez Bravo. Seeking "to explore and articulate the ways in which a vocable such as 'Mexico' is meaningful only when understood as an intricate combination of histories and practices," as she puts it, Iturbide has created a nuanced and sensitive documentary record of contemporary Mexico. She lives and works in Mexico City.
One of the principal concerns in recent years regarding the atmospheric environment has been the formation of ozone and other photo-oxidants over much of Europe in the summer. Ozone is formed in the atmosphere by a complex series of chemical reactions in the presence of sunlight from volatile organic compounds and nitrogen oxides. As the reactions take place in air flows determined by the detailed meteorological situation, the measurement, interpretation, understanding and modelling of the levels, fluxes and origins of the ozone are extremely difficult. The present volume reviews several of the currently important questions and presents detailed reports from investigators all over the continent. As such, it provides insight into the current scientific views about ozone in Europe.
The book (COST Action Final report) summarises the proceedings from COST Action ES1206. COST Action ES1206, Advanced GNSS Tropospheric Products for Severe Weather Events and Climate (GNSS4SWEC), was a 4-year project, running from 2013 to 2017, which coordinated new and improved capabilities from concurrent developments in GNSS, meteorological and climate communities. For the first time, the synergy of multi-GNSS constellations was used to develop new, more advanced tropospheric products, exploiting the full potential of multi-GNSS on a wide range of temporal and spatial scales - from real-time products monitoring and forecasting severe weather, to the highest quality post-processed products suitable for climate research. The Action also promoted the use of meteorological data as an input to real-time GNSS positioning, navigation, and timing services and has stimulated knowledge and data transfer throughout Europe and beyond.
The occurrence of high concentrations of ozone during summer episodes in the troposphere over Europe is a problem still unsolved. Although a number· of measures have been implemented that will achieve a further reduction of precursor emissions in the next years, this will not be sufficient to reduce the ozone concentration to levels below thresholds set up to protect human health and plants. Thus, further reductions of emissions of volatile organic compounds and nitrogen oxides are necessary. However, with regard to the increasing costs associated with increasing emission reduction, it is essential to implement abatement strategies, that are effective, i.e. achieving the environmental aim set up, and efficient, i. e. doing this with the least costs possible. In this book, the authors describe the features and the application of a methodology and a model system to identify effective and efficient strategies to reduce ambient concentrations of tropospheric ozone to comply with thresholds set up to protect human health, agricultural crops and ecosystems. Furthermore, macroeconomic impacts of such strategies are addressed and, as burden and benefits of these strategies are not equally distributed between countries, different burden sharing schemes are discussed. The content of this book is based on results of a comprehensive research project, the project INFOS (assessment of policy instruments for efficient ozone abatement strategies in Europe), funded by the European Commission (Directorate General XII) under the Fourth Framework Programme for research, technological development and demonstration activities.