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Author: Jedol Dayou
Publisher: Springer
ISBN: 9812871012
Category : Science
Languages : en
Pages : 67
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Book Description
This book gives a detailed review on ground-based aerosol optical depth measurement with emphasis on the calibration issue. The review is written in chronological sequence to render better comprehension on the evolution of the classical Langley calibration from the past to present. It not only compiles the existing calibration methods but also presents a novel calibration algorithm in Langley sun-photometry over low altitude sites which conventionally is a common practice performed at high observatory stations. The proposed algorithm avoids travelling to high altitudes for frequent calibration that is difficult both in logistics and financial prospects. We addressed the problem by combining clear-sky detection model and statistical filter to strictly imitate the ideal clear-sky condition at high altitude for measurements taken over low altitudes. In this way, the possible temporal atmospheric drifts, abundant aerosol loadings and short time interval cloud transits are properly constrained. We believe that this finding has an integral part of practicality and versatility in ground-based aerosol optical depth measurement, which is nowadays an important climate agent in many atmospheric studies. Finally, the outcome of this book introduces a new calibration technique for the study and measurement of aerosol monitoring with emphasis on aerosol optical depth that we believe could be very beneficial to researchers and scientists in the similar area.
Author: Jedol Dayou
Publisher: Springer
ISBN: 9812871012
Category : Science
Languages : en
Pages : 67
Get Book Here
Book Description
This book gives a detailed review on ground-based aerosol optical depth measurement with emphasis on the calibration issue. The review is written in chronological sequence to render better comprehension on the evolution of the classical Langley calibration from the past to present. It not only compiles the existing calibration methods but also presents a novel calibration algorithm in Langley sun-photometry over low altitude sites which conventionally is a common practice performed at high observatory stations. The proposed algorithm avoids travelling to high altitudes for frequent calibration that is difficult both in logistics and financial prospects. We addressed the problem by combining clear-sky detection model and statistical filter to strictly imitate the ideal clear-sky condition at high altitude for measurements taken over low altitudes. In this way, the possible temporal atmospheric drifts, abundant aerosol loadings and short time interval cloud transits are properly constrained. We believe that this finding has an integral part of practicality and versatility in ground-based aerosol optical depth measurement, which is nowadays an important climate agent in many atmospheric studies. Finally, the outcome of this book introduces a new calibration technique for the study and measurement of aerosol monitoring with emphasis on aerosol optical depth that we believe could be very beneficial to researchers and scientists in the similar area.
Author: Jacqueline Lenoble
Publisher: Springer Science & Business Media
ISBN: 3642177255
Category : Technology & Engineering
Languages : en
Pages : 423
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Book Description
This book gives a much needed explanation of the basic physical principles of radiative transfer and remote sensing, and presents all the instruments and retrieval algorithms in a homogenous manner. The editors provide, for the first time, an easy path from theory to practical algorithms in one easily accessible volume, making the connection between theoretical radiative transfer and individual practical solutions to retrieve aerosol information from remote sensing, and providing the specifics and intercomparison of all current and historical retrieval methods.
Author: Alexander A. Kokhanovsky
Publisher: Springer Science & Business Media
ISBN: 3540499091
Category : Science
Languages : en
Pages : 154
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Book Description
This new text offers experienced students a comprehensive review of available techniques for the remote sensing of aerosols. These small particles influence both atmospheric visibility and the thermodynamics of the atmosphere. They are also of great importance in any consideration of climate change problems. Aerosols may also be responsible for the loss of harvests, human health problems and ecological disasters. Thus, this detailed study of aerosol properties on a global scale could not be more timely.
Author: Alexander A. Kokhanovsky
Publisher: Springer Science & Business Media
ISBN: 3540693971
Category : Science
Languages : en
Pages : 398
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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 : Energy policy
Languages : en
Pages : 364
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Book Description
Author: Sandra Marcela Loria-Salazar
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 208
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Book Description
The aim of the present work is to carry out a detailed analysis of ground and columnar aerosol properties obtained by in-situ Photoacoustic and Integrated Nephelometer (PIN), Cimel CE-318 sunphotometer and MODIS instrument onboard Aqua and Terra satellites, for semi-arid Reno, Nevada, USA in the local summer months of 2012. Satellite determination of local aerosol pollution is desirable because of the potential for broad spatial and temporal coverage. However, retrieval of quantitative measures of air pollution such as Aerosol Optical Depth (AOD) from satellite measurements is challenging because of the underlying surface albedo being heterogeneous in space and time. Therefore, comparisons of satellite retrievals with measurements from ground-based sun photometers are crucial for validation, testing, and further development of instruments and retrieval algorithms. Ground-based sunphotometry and in-situ ground observations show that seasonal weather changes and fire plumes have great influence on the atmosphere aerosol optics. The Apparent Optical Height (AOH) follows the shape of the development of the Convective Boundary Layer (CBL) when fire conditions were not present. However, significant fine particle optical depth was inferred beyond the CBL thereby complicating the use of remote sensing measurements for near-ground aerosol pollution measurements. A meteorological analysis was performed to help diagnose the nature of the aerosols above Reno. The calculation of a Zephyr index and back trajectory analysis demonstrated that a local circulation often induces aerosol transport from Northern CA over the Sierra Nevada Mountains that doubles the Aerosol Optical Depth (AOD) at 500 nm. Sunphotometer measurements were used as a 'ground truth' for satellite retrievals to evaluate the current state of the science retrievals in this challenging location. Satellite retrieved for AOD showed the presence of wild fires in Northern CA during August. AOD retrieved using the "dark-target algorithm" may be unrealistically high over the Great Basin. Low correlation was found between AERONET AOD and dark-target algorithm AOD retrievals from Aqua and Terra during June and July. During fire conditions the dark-target algorithm AOD values correlated better with AERONET measurements in August. Use of the Deep-blue algorithm for MODIS data to retrieve AOD did not provide enough points to compare with AERONET in June and July. In August, AOD from deep-blue and AERONET retrievals exhibited low correlation. AEE from MODIS products and AERONET exhibited low correlation during every month. Apparently satellite AOD retrievals need much improvement for areas like
Author: Raghavendra Kumar Kanike
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659706226
Category :
Languages : en
Pages : 228
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Book Description
In this book, we have described the optical and physical properties of aerosol which are considered to be an important in the Earth's radiation budget. The method of detection of various aerosol properties using ground-based automated Sun-sky radiometer is mentioned, by illustrating the measurements taken over one of a station, as part of Sun photometer worldwide network, named AERONET (AErosol RObotic NETwork). Besides, the basic details of Sun photometer, we have also illustrated the importance of synoptic weather parameters and use of trajectory analysis. Aerosol measurements from Sun photometer and satellite are compared and assessed the instruments capabilities. Using a large amount of data measured over a sub-tropical site in South Africa, we have studied the various optical properties of aerosol and their mutual relationship for addressing aerosol types. Classification and identification of different types of aerosol are elucidated by various methods. Apart from the results obtained, the study location has been considered to be significant due to only very few studies reported on aerosol properties, especially in the Southern Hemisphere and in Southern Africa region.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 57
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Book Description
Using solar wavelength radiance data obtained from the airborne AVIRIS instrument, during the LEO experiment, an analysis of aerosol optical depth (AOD) was completed using Tafkaa - a program developed by the Naval Research Laboratory (NRL). The objective of the analysis was to compare Tafkaa-retrieved AOD with AOD retrieved from SeaWiFS, and ground-based sun photometers. The intent of the study was to test enhanced AOD analysis using the hyperspectral coverage provided by AVIRIS. Comparisons between AOD retrieved by Tafkaa provided results consistent with SeaWiFS AOD retrieval and the AOD determined by ground-based sunphotometers in regions with minimal sediment and sun glint. A reliable sun glint mask was produced and applied to remove the effects of sun glint in the AVIRIS data.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720407874
Category :
Languages : en
Pages : 28
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Book Description
The BOREAS RSS-12 team collected both ground and airborne sunphotometer measurements for use in characterizing the aerosol optical properties of the atmosphere during the BOREAS data collection activities. These measurements are to be used to: 1) measure the magnitude and variability of the aerosol optical depth in both time and space; 2) determine the optical properties of the boreal aerosols; and 3) atmospherically correct remotely sensed data acquired during BOREAS. This data set contains airborne tracking sunphotometer data that were acquired from the C-130 aircraft during its flights over the BOREAS study areas. The data cover selected days and times from May to September 1994. The data are stored in tabular ASCII files. The data files are available on a CD-ROM (see document number 20010000884), or from the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).Hall, Forrest G. (Editor) and Nickeson, Jaime (Editor) and Lobitz, Brad and Spanner, Michael and Wrigley, RobertAmes Research Center; Goddard Space Flight CenterEARTH OBSERVATIONS (FROM SPACE); REMOTE SENSING; DATA ACQUISITION; AEROSOLS; OPTICAL PROPERTIES; PHOTOMETERS; ECOSYSTEMS; TRACKING (POSITION); TABLES (DATA); EARTH RESOURCES; OPTICAL THICKNESS; DEPTH MEASUREMENT; AIRBORNE EQUIPMENT; SOLAR POSITION
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781726223959
Category :
Languages : en
Pages : 30
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Book Description
The BOREAS RSS-11 team operated a network of five automated (Cimel) and two hand-held (Miami) solar radiometers from 1994 to 1996 during the BOREAS field campaigns. The data provide aerosol optical depth measurements, size distribution, phase function, and column water vapor amounts over points in northern Saskatchewan and Manitoba, Canada. The data are useful for the correction of remotely sensed aircraft and satellite images. The data are provided in tabular ASCII files.Markham, Brian L. and Hall, Forrest G. (Editor) and Nickerson, Jaime (Editor) and Schafer, Joel and Smith, David E. (Technical Monitor)Goddard Space Flight CenterNETWORKS; WATER VAPOR; SIZE DISTRIBUTION; REMOTE SENSING; PHOTOMETERS; DISTRIBUTION FUNCTIONS; DEPTH MEASUREMENT; SATELLITE IMAGERY; SASKATCHEWAN; RADIOMETERS; OPTICAL THICKNESS; MANITOBA; AEROSOLS; CANADA...
