12,927 Hits in 7.1 sec

Effect of spatial variability of wet snow on modeled and observed microwave emissions

Carrie M. Vuyovich, Jennifer M. Jacobs, Christopher A. Hiemstra, Elias J. Deeb
2017 Remote Sensing of Environment  
This signal response was evaluated over an area approximately the size of a microwave pixel to assess whether a relationship exists between the aerial extent of wet snow and the magnitude of the T B response  ...  A near-linear relationship was found between the T B signal response over a spatially heterogeneous snowpack and the percent area with liquid water content (LWC) present.  ...  In this study, we investigate the sensitivity of T B to spatially distributed wet snow using loosely coupled, physically-based snow and emission models.  ... 
doi:10.1016/j.rse.2017.06.016 fatcat:y3vigi3b6nfhvf4sbz35ylh77m

Modeling synthetic aperture radar (SAR) scattering from a seasonally varying snow-covered sea ice volume at 5.3 and 9.25 GHz

David G. Barber, Ellsworth F. LeDrew
1994 Polar Research  
The objective of thc research is to investigate the role of various geophysical and clcctrical properties in spccifying the total relative scattering cross section (u") of snow covered first-year sea ice  ...  Thc effcct of the thermal insulation of a snow coveron sea ice was shown to be significant for both E' and E".  ...  The SIMMS program is undertaken with support from a variety of agencies including a Centre of Excellence grant from the Province of Ontario and an NSERC (Natural Sciences and Engineering Research Council  ... 
doi:10.3402/polar.v13i1.6679 fatcat:m7hpi6vdc5ddxjnq3lgc3k4qay

Estimates of Threshold Wind Speeds for Snow Transport Using Meteorological Data

Long Li, John W. Pomeroy
1997 Journal of applied meteorology (1988)  
The observations display a nonlinear but generally positive correlation between threshold wind speed and air temperature.  ...  The threshold wind speed for snow transport is related to properties of the surface snowpack: snow particle bonding, cohesion, and kinetic friction.  ...  Gray, Chairman of the Division of Hydrology, for his encouragement and support of this work. Mr.  ... 
doi:10.1175/1520-0450(1997)036<0205:eotwsf>;2 fatcat:km2lv25anfe5lf2eofx2stgxpm

Estimation of Liquid Fraction of Wet Snow by Using 2-D Video Disdrometer and S-Band Weather Radar

Sung-Ho Suh, Hong-Il Kim, Eun-Ho Choi, Cheol-Hwan You
2021 Remote Sensing  
Wet snow may cause significant damage to humans and property, and thus, it is necessary to estimate the corresponding liquid fraction (FL).  ...  It was clarified that the volume-equivalent particle diameter (D)–FL and D–Ir relationships depended on T, and a relationship existed between Ir and FL.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs13101901 fatcat:vmhj6lhjhjhyvccgbxmvgslx6a

Proof of Concept: Development of Snow Liquid Water Content Profiler Using CS650 Reflectometers at Caribou, ME, USA

Carlos Pérez Díaz, Jonathan Muñoz, Tarendra Lakhankar, Reza Khanbilvardi, Peter Romanov
2017 Sensors  
For this reason, we present two (for dry and wet snow) statistical relationships between snow LWC and dielectric permittivity similar to Topp's equation for the LWC of mineral soils.  ...  The temporal evolution of snow wetness's plays a significant role in wet-snow avalanche prediction, meltwater release, and water availability estimations and assessments within a river basin.  ...  supervising the analysis and structure of the manuscript.  ... 
doi:10.3390/s17030647 pmid:28335574 pmcid:PMC5375933 fatcat:kg3fz2zh4rel3mj7gkihlesf2a

Potential and limitations of RADARSAT SAR data for wet snow monitoring

N. Baghdadi, Y. Gauthier, M. Bernier, J.-P. Fortin
2000 IEEE Transactions on Geoscience and Remote Sensing  
Index Terms-RADARSAT, synthetic aperture radar (SAR), wet snow.  ...  Based on Canadian Satellite (RADARSAT) synthetic aperture radar (SAR) images and simulations from a radar-backscattering model, we determined that conventional wet snow-mapping algorithms should perform  ...  This paper deals with the analysis of those data and the relationship between the backscattering coefficients, snow-surface wetness, incidence angle, and wet snow surface roughness.  ... 
doi:10.1109/36.823925 fatcat:ycaxe6mikrfrbnedulzp65hnuq

The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) – Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output

Clara Burgard, Dirk Notz, Leif T. Pedersen, Rasmus T. Tonboe
2020 The Cryosphere  
Finally, in our setup, we cannot assess the effect of wet snow properties.  ...  We investigate the influence of simplifying assumptions for the representation of sea ice vertical properties on the simulation of microwave brightness temperatures.  ...  We thank Stefan Kern for constructive comments and discussions. We also thank Mohammed Shokr and an anonymous reviewer for the detailed and constructive comments. Financial support.  ... 
doi:10.5194/tc-14-2369-2020 fatcat:7mzv2dv5bfhttad2z4de2zzgoi

Wideband Backscattering From Alpine Snow Cover: A Full-Season Study

Reza Naderpour, Mike Schwank, Derek Houtz, Charles Werner, Christian Matzler
2021 IEEE Transactions on Geoscience and Remote Sensing  
This article experimentally investigates relationships between copol backscattering at a wide range of frequencies (L-to Ka-bands) and snow-ground state parameters (SPs) in different evolution phases during  ...  An anticorrelation between reasonably high snow wetness and backscattering coefficient is found, especially at higher microwave frequencies.  ...  Investigation and quantification of such relationships are keys to developing a snow property retrieval algorithm, which considers the physics of microwave radiative transfer through the snow at a reasonable  ... 
doi:10.1109/tgrs.2021.3112772 fatcat:lo3se2sz5vgxde5art3liefl5i

Diverging sensitivity of soil water stress to changing snowmelt timing in the Western U.S

Adrian A. Harpold
2016 Advances in Water Resources  
The observation and model results confirmed 470 that the physical mechanisms capable of driving the observed snow disappearance-growing 471 season relationships depended on interactions between soil properties  ...  Of the 62 sites investigated, 36 had significant relationships between earlier snowmelt and the duration of soil water stress.  ... 
doi:10.1016/j.advwatres.2016.03.017 fatcat:f2pfbvjxszdznmw2cbhxdc6ype

Climatic physical snowpack properties for large-scale modeling examined by observations and a physical model

Kazuyuki Saito, Satoru Yamaguchi, Hiroki Iwata, Yoshinobu Harazono, Kenji Kosugi, Michael Lehning, Martha Shulski
2012 Polar Science  
Here we have conducted an integral study using site observations and a model with detailed snow dynamics, to examine the capability of the model for deriving a simple relationship between the density and  ...  The one-dimensional snow dynamics model, SNOWPACK, simulated the evolution of the snowpack and compared observations between all sites.  ...  The snow water equivalent data of AMSR-E were provided by the AMSR-E near real-time database of the Japan Aerospace Exploration Agency (JAXA), through the IARC-JAXA Information System (IJIS).  ... 
doi:10.1016/j.polar.2012.02.003 fatcat:dv7m3wpv4belpincgitlfsnowm

Remote sensing of Greenland ice sheet using multispectral near-infrared and visible radiances

Petr Chylek, M. McCabe, M. K. Dubey, J. Dozier
2007 Journal of Geophysical Research  
1] We present the physical basis of and validate a new remote-sensing algorithm that utilizes reflected visible and near-infrared radiation to discriminate between dry and wet snow.  ...  We combine this empirical relationship with historic temperature data to infer that the melt-day area of the western part of the ice sheet doubled between the mid-1990s and mid-2000s and that the largest  ...  Physical Basis of Multispectral Wet/Dry Snow Detection [6] An algorithm developed recently to distinguish between water, ice and mixed phase clouds [Chylek and Borel, 2004; King et al., 2004; Chylek et  ... 
doi:10.1029/2007jd008742 fatcat:v6znwpmymzdpdbvukqlt5day7y

Microwave Signatures of Snow on Sea Ice: Modeling

D.C. Powell, T. Markus, D.J. Cavalieri, A.J. Gasiewski, M. Klein, J.A. Maslanik, J.C. Stroeve, M. Sturm
2006 IEEE Transactions on Geoscience and Remote Sensing  
Current snow-depthover-sea-ice retrieval algorithms do not sufficiently account for variations in snow and ice physical properties that can affect the accuracy of retrievals.  ...  For this reason, airborne microwave observations were coordinated with ground-based measurements of snow depth and snow properties in the vicinity of Barrow, AK, in March 2003.  ...  Mätzler for the use of the MEMLS code and the reviewers of this paper for their excellent comments and suggestions.  ... 
doi:10.1109/tgrs.2006.882139 fatcat:tm55aukerbhc5mbccgvy7e7woy

A broad spectral, interdisciplinary investigation of the electromagnetic properties of sea ice

K.C. Jezek, D.K. Perovich, K.M. Golden, C. Luther, D.G. Barber, P. Gogineni, T.C. Grenfell, A.K. Jordan, C.D. Mobley, S.V. Nghiem, R.G. Onstott
1998 IEEE Transactions on Geoscience and Remote Sensing  
The objectives of the initiative were the following: 1) understand the mechanisms and processes that link the morphological and physical properties of sea ice to its electromagnetic (EM) characteristics  ...  This paper highlights the interrelationship of research completed by a team of investigators and presented in the several individual papers comprising this Special Section on the Office of Naval Research  ...  Such measurements provide a new tool for understanding the relationships between ice physical and optical properties.  ... 
doi:10.1109/36.718635 fatcat:gr3hgcmzirdq7nyhlfwofdsv2y

Possible Effect of Anthropogenic Aerosol Deposition on Snow Albedo Reduction at Shinjo, Japan

Hiroki MOTOYOSHI, Teruo AOKI, Masahiro HORI, Osamu ABE, Shigeto MOCHIZUKI
2005 Journal of the Meteorological Society of Japan  
Measurement of the atmospheric aerosols above the snow surface using a laser optical particle counter suggested that wet deposition of atmospheric aerosols caused snow impurities of more than 1 ppmw in  ...  We examined the dependence of albedos on snow grain size and on concentration of snow impurities, comparing observations and theoretical calculations using a radiative transfer model for atmosphere-snow  ...  This work was conducted as a part of the ADEOS II/GLI Cal/ Val experiment, supported by the Japan Aerospace Exploration Agency and a cooperative study on the optical properties of snow between the Meteorological  ... 
doi:10.2151/jmsj.83a.137 fatcat:ahbsmvs3efeqldk3mrmywsyyvm

Greenland ice-sheet surface properties observed by the Seasat-A scatterometer at enhanced resolution

David G. Long, Mark R. Drinkwater
1994 Journal of Glaciology  
, wet-snow, and ablation facies, over virtually the entire ice sheet.  ...  The results provide a base line with which to compare current (ERS-1) and future Greenland radar maps of snow-and ice-surface conditions.  ...  ACKNOWLEDGEMENTS We wish to acknowledge the support of the National Aeronautics and Space Administration (NASA) programs in Physical Oceanography (D. Adamec) and Polar Sciences (R. Thomas).  ... 
doi:10.3189/s0022143000007310 fatcat:s7djhdewhjdxfixxmqe52o6obq
« Previous Showing results 1 — 15 out of 12,927 results