Download or read book Meteorological Processes Controlling the Variability of Net Annual Accumulation Over the Greenland Ice Sheet written by Deborah J. Bathke and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Climatic information available from the spatially extensive suite of firn and ice cores collected under the Program for Arctic and Regional Climate Assessment (PARCA), in conjunction with other data, provides an unparalleled opportunity to investigate accumulation changes over the Greenland ice sheet and to assess its ability to record and preserve a history of North Atlantic climate variability. The ice core derived accumulation histories demonstrate that the influence of glaciological noise on the climate signal is strongly influenced by the accumulation rate. Thus, it may be difficult to discern regionally representative climate signals from individual cores at lower accumulation sites on short time scales suggesting that either time or spatial averaging of the records is necessary. Individual rotated principal components analysis (RPCA) on the time series of net annual accumulation, the total concentration of insoluble dust particles, and the (delta)18O annual average and seasonal extrema reveal that cores located in different regions of the ice sheet do not vary consistently for the period of record in this study (1965-1996). Specifically, cores from southern Greenland vary in a manner different from those in the central west region. Thus, proxy climate histories drawn from a single core record are not necessarily representative of the entire ice sheet. Comparison of the scores associated with the central west and southern Greenland spatial patterns with atmospheric and oceanic data suggest that different processes may be responsible for delivery of precipitation to each region. Correlations of the North Atlantic Oscillation with the core data, combined with composites of mean sea level pressure and 500 hPA heights for accumulation extremes, suggest a negative relationship with the central west region during winter, spring, and summer. Conversely, the same analyses for the southern region suggest a positive relationship to the NAO during summer. Accumulation in the central west region is likely influenced by the NAO during winter and spring, as well as by associated changes in surface temperatures over Canada and sea surface temperatures in the Baffin Bay/Davis Strait. Alternatively, accumulation in southern Greenland is consistently associated with changes in the Pacific.
Download or read book Variability and Forcing of Climate Parameters on the Greenland Ice Sheet written by Konrad Steffen and published by . This book was released on 2005 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interannual variability in net accumulation on the Greenland Ice Sheet written by C. J. van der VEEN and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polar Environments and Global Change written by Roger G. Barry and published by Cambridge University Press. This book was released on 2018-08-09 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys atmospheric, oceanic and cryospheric processes, present and past conditions, and changes in polar environments.
Download or read book Variability and Forcing of Climate Parameters on the Greenland Ice Sheet written by Konrad Steffen and published by . This book was released on 2003 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Climate Variability of the Greenland Ice Sheet Integration of in Situ and Satellite Data written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-25 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed research involves the application of multispectral satellite data in combination with ground truth measurements to monitor surface properties of the Greenland Ice Sheet which are essential for describing the energy and mass of the ice sheet. Several key components of the energy balance are parameterized using satellite data and in situ measurements. The analysis will be done for a ten year time period in order to get statistics on the seasonal and interannual variations of the surface processes and the climatology. Our goal is to investigate to what accuracy and over what geographic areas large scale snow properties and radiative fluxes can be derived based upon a combination of available remote sensing and meteorological data sets. Operational satellite sensors are calibrated based on ground measurements and atmospheric modeling prior to large scale analysis to ensure the quality of the satellite data. Further, several satellite sensors of different spatial and spectral resolution are intercompared to access the parameter accuracy. Proposed parameterization schemes to derive key component of the energy balance from satellite data are validated. For the understanding of the surface processes a field program was designed to collect information on spectral albedo, specular reflectance, soot content, grain size and the physical properties of different snow types. Further, the radiative and turbulent fluxes at the ice/snow surface are monitored for the parameterization and interpretation of the satellite data. The expected results include several baseline data sets of albedo, surface temperature, radiative fluxes, and different snow types of the entire Greenland Ice Sheet. These climatological data sets will be of potential use for climate sensitivity studies in the context of future climate change. Steffen, K. and Abdalati, W. and Stroeve, J. and Key, J. Unspecified Center NAGW-2158
Download or read book Environmental and Climatic Controls on Glaciochemistry of Near surface Snow in Greenland written by Gifford J. Wong and published by . This book was released on 2015 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Arctic temperature and precipitation have been rising over recent decades, with implications for Greenland Ice Sheet (GrIS) mass balance, sea level rise, and thermohaline circulation via Arctic Ocean freshening. However, meteorological station data spanning more than three decades are sparse in the Arctic. The central objectives of this dissertation are to develop and analyze recent temperature and precipitation records in northwest (NW) Greenland, assess the spatial and temporal variability in precipitation from the coast to high on the GrIS, and identify the dynamical causes of these trends. In this dissertation, I develop a continuous instrumental record of NW Greenland meteorology from 1952-2012, and collect a series of snow pit and ice core records along a coast-to-interior ice sheet traverse, in order to investigate temperature and precipitation trends and their environmental controls in NW Greenland. Ice core and snow pit precipitation proxy records are based on chemical demarcations of annual snow accumulation layers. An artificial meltwater experiment at Summit, Greenland indicates that melt-disturbed trace element snow chemistry remains seasonally stratified. I find a significant (p
Download or read book The Distribution of Ten meter Snow Temperatures on the Greenland Ice Sheet written by Steven J. Mock and published by . This book was released on 1965 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: All available 10-m snow temperatures from the Greenland ice sheet have been collected and analyzed using multiple regression techniques to develop equations capable of accurately predicting these temperatures. The resulting equations show that 10-m snow temperatures in north Greenland and its sub-areas can be accurately predicted from the independent parameters, latitude and elevation. Longitude was found to be another significant parameter in south Greenland. In all cases the values of the multiple correlation coefficients were .928 or greater. Gradients of 10-m snow temperatures vs elevation for north Greenland are close to the dry adiabatic lapse rate, indicating adiabatic warming of katabatic winds as the controlling mechanism in the altitudinal distribution of both mean annual air temperatures and 10-m snow temperatures in dry snow. The data also suggest that south Greenland is colder with respect to its latitude and longitude than north Greenland. An isotherm contour map showing the distribution of 10-m snow temperatures on the Greenland ice sheet calculated from the prediction equations was prepared. A tabulation of the elevations and sources as well as brief studies of Marie Byrd Land and Victoria Land in the Antarctic are included. (Author).
Download or read book The Earth Observer written by and published by . This book was released on 1999 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thriving on Our Changing Planet A Decadal Strategy for Earth Observation from Space written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-06-18 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: We live on a dynamic Earth shaped by both natural processes and the impacts of humans on their environment. It is in our collective interest to observe and understand our planet, and to predict future behavior to the extent possible, in order to effectively manage resources, successfully respond to threats from natural and human-induced environmental change, and capitalize on the opportunities â€" social, economic, security, and more â€" that such knowledge can bring. By continuously monitoring and exploring Earth, developing a deep understanding of its evolving behavior, and characterizing the processes that shape and reshape the environment in which we live, we not only advance knowledge and basic discovery about our planet, but we further develop the foundation upon which benefits to society are built. Thriving on Our Changing Planet: A Decadal Strategy for Earth Observation from Space (National Academies Press, 2018) provides detailed guidance on how relevant federal agencies can ensure that the United States receives the maximum benefit from its investments in Earth observations from space, while operating within realistic cost constraints. This short booklet, designed to be accessible to the general public, provides a summary of the key ideas and recommendations from the full decadal survey report.
Download or read book Changes in Greenland ice sheet elevation attributed primarily to snow accumulation variability written by J.R. McCONNELL and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Climate Variability of the Greenland Ice Sheet written by and published by . This book was released on 1995 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Climate Variability of the Greenland Ice Sheet written by Konrad Steffen and published by . This book was released on 1994 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Climate Variability on Decade to Century Time Scales written by National Research Council and published by National Academies Press. This book was released on 1996-08-30 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reflects the current state of scientific knowledge about natural climate variability on decade-to-century time scales. It covers a wide range of relevant subjects, including the characteristics of the atmosphere and ocean environments as well as the methods used to describe and analyze them, such as proxy data and numerical models. They clearly demonstrate the range, persistence, and magnitude of climate variability as represented by many different indicators. Not only do natural climate variations have important socioeconomic effects, but they must be better understood before possible anthropogenic effects (from greenhouse gas emissions, for instance) can be evaluated. A topical essay introduces each of the disciplines represented, providing the nonscientist with a perspective on the field and linking the papers to the larger issues in climate research. In its conclusions section, the book evaluates progress in the different areas and makes recommendations for the direction and conduct of future climate research. This book, while consisting of technical papers, is also accessible to the interested layperson.
Download or read book Principles of Glacier Mechanics written by Roger LeB. Hooke and published by Cambridge University Press. This book was released on 2019-12-05 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principles of glacier physics are developed from basic laws in this up-to-date third edition for advanced students and researchers.
Download or read book Variability and Forcing of Climate Parameters on the Greenland Ice Sheet written by Konrad Steffen and published by . This book was released on 2006 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
