نتایج جستجو برای: glaciers

تعداد نتایج: 4288  

Journal: :Proceedings of the American Philosophical Society 2010
Lonnie G Thompson

Glaciers are among the world's best recorders of, and first responders to, natural and anthropogenic climate change and provide a time perspective for current climatic and environmental variations. Over the last 50 years such records have been recovered from the polar regions as well as low-latitude, high-elevation ice fields. Analyses of these ice cores and of the glaciers from which they have...

2011
Vladimir M. Kotlyakov

Keywords: Artificial intensification of melting; blackening of snow and ice; constructions from snow and ice; engineering-glaciology problems; freezing of water onto ice; utilization of icebergs Contents 1. Introduction 2. Engineering-glaciology problems 2.1. Mechanical principle of the effect 2.2. Thermal physical principle of the effects 3. Artificial intensification of melting of mountain gl...

2012
J. J. Clague

Glaciers in the Canadian Rocky Mountains constitute an important freshwater resource. To enhance our understanding of the influence climate and local topography have on glacier area, large numbers of glaciers of different sizes and attributes need to be monitored over periods of many decades. We used Interprovincial Boundary Commission Survey (IBCS) maps of the Alberta–British Columbia (BC) bor...

2018
Benjamin A. Robson Christopher Nuth Pål R. Nielsen Luc Girod Marijn Hendrickx Svein Olaf Dahl

This study assesses changes in glacier area, velocity, and geodetic mass balance for the glaciers in the Manaslu region of Nepal, a previously undocumented region of the Himalayas. We studied changes between 1970 (for select glaciers), 2000, 2005, and 2013 using freely available Landsat satellite imagery, the SRTM Digital Elevation Model (DEM) and a DEM based on Worldview imagery. Our results s...

2015
Annina Sorg Andreas Kääb Andrea Roesch Christof Bigler Markus Stoffel

While the responses of Tien Shan glaciers--and glaciers elsewhere--to climatic changes are becoming increasingly well understood, this is less the case for permafrost in general and for rock glaciers in particular. We use a novel approach to describe the climate sensitivity of rock glaciers and to reconstruct periods of high and low rock glacier activity in the Tien Shan since 1895. Using more ...

2013
Laura García-Descalzo Eva García-López Marina Postigo Fernando Baquero Alberto Alcazar Cristina Cid

Little is known about the viability of eukaryotic microorganisms preserved in icy regions. Here we report on the diversity of microbial eukaryotes in ice samples derived from four Pyrenean glaciers. The species composition of eukaryotic communities in these glaciers is unknown mostly because of the presence of a multi-year ice cap, and it is not clear whether they harbor the same populations. T...

2015
Jing Ming Yaqiang Wang Zhencai Du Tong Zhang Wanqin Guo Cunde Xiao Xiaobin Xu Minghu Ding Dongqi Zhang Wen Yang Shilong Piao

BACKGROUND The widely distributed glaciers in the greater Himalayan region have generally experienced rapid shrinkage since the 1850s. As invaluable sources of water and because of their scarcity, these glaciers are extremely important. Beginning in the twenty-first century, new methods have been applied to measure the mass budget of these glaciers. Investigations have shown that the albedo is ...

2010
Valentina Radić Regine Hock

[1] Very few global‐scale ice volume estimates are available for mountain glaciers and ice caps, although such estimates are crucial for any attempts to project their contribution to sea level rise in the future. We present a statistical method for deriving regional and global ice volumes from regional glacier area distributions and volume area scaling using glacier area data from ∼123,000 glac...

2006
Tien Shan Baolin LI A-Xing ZHU Yichi ZHANG Tao PEI Chengzhi QIN Chenghu ZHOU

Terminus fluctuation and area change in mountain glaciers in the middle Chinese Tien Shan over the past four decades are examined, based on Landsat multispectral scanner (MSS), Enhanced Thematic Mapper Plus (ETM+), Système Probatoire pour l’Observation de la Terre (SPOT) highresolution visible (HRV) imagery, topographical maps and China Glacier Inventory data using Geographical Information Syst...

2002
Samjwal Ratna BAJRACHARYA Pradeep Kumar MOOL Sharad Prasad JOSHI

Spatial and attribute database of the glaciers and glacial lakes of whole Nepal had developed by ICIMOD in collaboration with UNEP/RRC-AP in 2001 using remote sensing and geographic information systems techniques. There are altogether 3,252 glaciers covering an area of 5,322 square kilometer with approximately 481 km of ice reserves. The Mahakali River basin comprises 87 glaciers with an area o...

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