Download or read book Airborne Electromagnetics as a Method for Arctic Wide Sea Ice Thickness Retrieval written by Lasse Rabenstein and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Airborne Electromagnetics as a Method for Arctic Wide Sea Ice Thickness Retrieval written by Lasse Rabenstein and published by . This book was released on 2010 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sea Ice Analysis and Forecasting written by Tom Carrieres and published by Cambridge University Press. This book was released on 2017-10-05 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the science involved in automated prediction of sea ice, for sea ice analysts, researchers, and professionals.
Download or read book Analysis of Airborne Electromagnetic Systems for Mapping Thickness of Sea Ice written by A. Becker and published by . This book was released on 1983 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is part of our research program addressing AEM ice thickness determination and will demonstrate that the Navy requirements for rapid airborne methods for mapping ice thickness, in real time, can be accomplished with AEM techniques. At present, there are not reliable airborne techniques for measuring directly sea ice thickness, although impulse radar has yielded promising results by implying sea ice thickness from ice roughness measurements.
Download or read book Airborne Electromagnetic Sensing of Sea ice Thickness written by Guimin Liu and published by . This book was released on 1989 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ice in the Ocean written by Peter Wadhams and published by CRC Press. This book was released on 2000-10-31 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: ICe in the Ocean examines sea ice and icebergs and their role in the global climate system. It is comprehensive textbook suitablefor students, pure and applied researchers, and anyone interested in the polar oceans; the distribution of sea ice; the mechanisms of growth, development and decay; the thermodynamics and dynamics of sea ice; sea ice deformation and ridge-building; the role of marginal ice zones; the characteristics of icebergs; and the part played by sea ice in the climate system and in the transport of pollutants. An extensive reference list and recommendations for further reading and numerous illustrations, and add to the usefulness of the text.
Download or read book Towards Multi Channel Inversion of Electromagnetic Sea Ice Surveys written by Anne Irvin and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sea ice is a crucial parameter in climate research as it plays an important role in the interaction between oceans and the atmosphere in polar regions. It is considered a climate indicator and it is critical to observe its development in the context of climate change. While sea ice extent provides a picture of the surface conditions of the ice, ice thickness information is needed to fully understand the overall sea ice conditions. Frequency domain electromagnetic (EM) induction sounding is a non-invasive remote sensing method to measure sea ice thickness changes on the regional scale as well as provide a means to calibrate and validate satellite ice thickness data. This PhD thesis aims to advance the analysis of airborne and ground based sea ice thickness measurements from frequency domain EM sounding by improving ice thickness retrievals with concurrent use of Inphase and Quadrature instrument responses in a numerical inversion for multi- and single-frequency devices. The developed methods and algorithms include the forward modelling code and GUI ODFEM (One Dimensional Frequency domain Electromagnetic Model) to simulate the EM instrument responses for Inphase and Quadrature for different instrument and model settings. Furthermore, a brute force inversion method was established which can be used in combination with the 1D forward models created with ODFEM to invert single- and multi-frequency EM data into multi-layer ice thicknesses and ice conductivities. The performance of the developed brute force inversion algorithm is demonstrated on a variety of field data sets including an approach on how to resolve the thickness of a slush layer and its conductivity (wet saline snow) using a five-layer-model and the data of 3 measurement frequencies. Furthermore, how to measure the thickness and determine the conductivity of a sub-ice-platelet-layer commonly observed in Antarctica is demonstrated using an inversion of the two channel output of a single-frequency instrument (Inphase and Quadrature) in combination with in situ drill hole measurements. The methods and algorithms developed within this thesis provide new and more extended applications for a variety of EM devices for ground based and airborne ice thickness surveys.
Download or read book Airborne Electromagnetic Sounding of Sea Ice Thickness and Sub ice Bathymetry written by Austin Kovacs and published by . This book was released on 1987 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Design and Implementation of a Low power Embedded System for Data Collection in an Airborne Sea Ice Thickness Observing System written by Thimira Sanuka Thilakarathna Asurapmudalige and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Long-Range Airborne Snow and Sea Ice Thickness Observing System (LASSITOS) is an airborne electromagnetic (AEM) system, currently under development, which uses a customdesigned instrument mounted on an Unmanned Aerial System (UAS) to measure Arctic sea ice and snow thickness. This project requires specialized instruments that are both low-power and lightweight. This thesis describes a design and implementation of a prototype data logging system based on an ultra-low power microcontroller, for the LASSITOS instrument. Three 32-bit Analog-toDigital Converter (ADC) integrated circuits (IC) are used to sample and convert the receiving EM signal at a rate of 19200 SPS. The system is capable of writing the sampled data and diagnostic data to the SD card at a combined rate of up to 307200 B/s. A 30 KB circular buffer is used to avoid data loss during SD card busy periods. Three DMA channels are used to optimize the communication between the ADCs and the SD card over SPI to achieve these data rates.
Download or read book Airborne Electromagnetic Sensing of Sea Ice Thickness written by Guimin Liu and published by . This book was released on 1987 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: One can compute the theoretical response of a frequency domain airborne electromagnetic (AEM) system when it is flown over a perfectly conducting medium with arbitrary surface relief.
Download or read book Sea ice Thickness Measurement Using a Small Airborne Electromagnetic Sounding System written by and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Remote Sensing of Sea Ice in the Northern Sea Route written by Ola M. Johannessen and published by Springer Science & Business Media. This book was released on 2006-11-30 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Remote Sensing of Sea Ice in the Northern Sea Route: Studies and Applications initially provides a history of the Northern Sea Route as an important strategic transport route for supporting the northern regions of Russia and cargo transportation between Europe and the Northern Pacific Basin. The authors then describe sea ice conditions in the Eurasian Arctic Seas and, using microwave satellite data, provide a detailed analysis of difficult sea ice conditions. Remote sensing techniques and the basic principles of SAR image formation are described, as well as the major satellite radar systems used for ice studies in the Arctic. The authors take a good look at the use of sensing equipment in experiments, including the ICE WATCH project used for monitoring the Northern Sea Route. The possibilities of using SAR remote sensing for ice navigation in the Northern Sea Route is also detailed, analysing techniques of automatic image processing and interpretation. A study is provided of regional drifting ice, fast ice and river ice in the coastal areas of the Arctic Seas. The book concludes with a review of the practical experience using SAR images for supporting navigation and offshore industrial activity, based on a series of experiments conducted with the Murmansk Shipping Company on board nuclear icebreakers.
Download or read book Antarctic Sea Ice Variability in the Southern Ocean Climate System written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-04-24 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sea ice surrounding Antarctica has increased in extent and concentration from the late 1970s, when satellite-based measurements began, until 2015. Although this increasing trend is modest, it is surprising given the overall warming of the global climate and the region. Indeed, climate models, which incorporate our best understanding of the processes affecting the region, generally simulate a decrease in sea ice. Moreover, sea ice in the Arctic has exhibited pronounced declines over the same period, consistent with global climate model simulations. For these reasons, the behavior of Antarctic sea ice has presented a conundrum for global climate change science. The National Academies of Sciences, Engineering, and Medicine held a workshop in January 2016, to bring together scientists with different sets of expertise and perspectives to further explore potential mechanisms driving the evolution of recent Antarctic sea ice variability and to discuss ways to advance understanding of Antarctic sea ice and its relationship to the broader ocean-climate system. This publication summarizes the presentations and discussions from the workshop.
Download or read book Data driven Regularization and Uncertainty Estimation to Improve Sea Ice Data Assimilation written by Nazanin Asadi and published by . This book was released on 2019 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate estimates of sea ice conditions such as ice thickness and ice concentration in the ice-covered regions are critical for shipping activities, ice operations and weather forecasting. The need for this information has increased due to the recent record of decline in Arctic ice extent and thinning of the ice cover, which has resulted in more shipping activities and climate studies. Despite the extensive studies and progress to improve the quality of sea ice forecasts from prognostic models, there is still significant room for improvement. For example, ice-ocean models have difficulty estimating the ice thickness distribution accurately. To help improve model forecasts, data assimilation is used to combine observational data with model forecasts and produce more accurate estimates. The assimilation of ice thickness observations, compared to other ice parameters such as ice concentration, is still relatively unexplored since the satellite-based ice thickness observations have only recently become common. Also, preserving sharp features of ice cover, such as leads and ridges, can be difficult, due to the spatial correlations in the background error covariance matrices. At the same time, the current ice concentration assimilation systems do not directly assimilate high resolution sea ice information from synthetic aperture radar (SAR), even though they are the main source of information for operational production of ice chart products at the Canadian Ice Service. The key challenge in SAR data assimilation is automating the interpretation of SAR images. To address the problem of assimilating ice thickness observations while preserving sharp features, two different objective functions are studied. One with a conventional l2-norm and one imposing an additional l1-norm on the derivative of the ice thickness state estimate as a sparse regularization. The latter is motivated by analysis of high resolution ice thickness observations derived from an airborne electromagnetic sensor demonstrating the sparsity of the ice thickness in the derivative domain. The data fusion and data assimilation experiments are performed over a wide range of background and observation error correlation length scales. Results demonstrate the superiority of using a combined l1-l2 regularization framework especially when the background error correlation length scale was relatively short (approximately five times the analysis grid spacing). The problem of automated information retrieval from SAR images has been explored in a problem of ice/water classification. The selected classification approach takes advantage of neural networks to produce results comparable to a previous study using logistic regression. The employed dataset in both studies is a comprehensive dataset consisting of 15405 SAR images over a seven year period, covering all months and different locations. In addition, recent neural network uncertainty estimation approaches are employed to estimate the uncertainty associated with the classification of ice/water labels, which was not explored in this problem domain previously. These predicted uncertainties can improve the automated classification process by identifying regions in the predictions that should be checked manually by an analyst.
Download or read book Sea Ice written by David N. Thomas and published by John Wiley & Sons. This book was released on 2017-03-06 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past 20 years the study of the frozen Arctic and Southern Oceans and sub-arctic seas has progressed at a remarkable pace. This third edition of Sea Ice gives insight into the very latest understanding of the how sea ice is formed, how we measure (and model) its extent, the biology that lives within and associated with sea ice and the effect of climate change on its distribution. How sea ice influences the oceanography of underlying waters and the influences that sea ice has on humans living in Arctic regions are also discussed. Featuring twelve new chapters, this edition follows two previous editions (2001 and 2010), and the need for this latest update exhibits just how rapidly the science of sea ice is developing. The 27 chapters are written by a team of more than 50 of the worlds’ leading experts in their fields. These combine to make the book the most comprehensive introduction to the physics, chemistry, biology and geology of sea ice that there is. This third edition of Sea Ice will be a key resource for all policy makers, researchers and students who work with the frozen oceans and seas.
Download or read book Sea Ice in the Arctic written by Ola M. Johannessen and published by Springer Nature. This book was released on 2019-11-12 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides in-depth information about the sea ice in the Arctic at scales from paleoenvironmental variability to more contemporary changes during the past and present centuries. The book is based on several decades of research related to sea ice in the Arctic and its variability, sea ice process studies as well as implications of the sea ice variability on human activities. The chapters provide an extensive overview of the research results related to sea ice in the Arctic at paleo-scales to more resent scales of variations as well as projections for changes during the 21st century. The authors have pioneered the satellite remote sensing monitoring of sea ice and used other monitoring data in order to study, monitor and model sea ice and its processes.
Download or read book Modern Physical Methods of Measuring the Thickness of Sea Ice written by Vitaliĭ Vasilʹevich Bogorodskiĭ and published by . This book was released on 1964 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
