کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8915473 | 1641101 | 2018 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Estimating water volume stored in the south-eastern Greenland firn aquifer using magnetic-resonance soundings
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
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![عکس صفحه اول مقاله: Estimating water volume stored in the south-eastern Greenland firn aquifer using magnetic-resonance soundings Estimating water volume stored in the south-eastern Greenland firn aquifer using magnetic-resonance soundings](/preview/png/8915473.png)
چکیده انگلیسی
Recent observations of the Greenland ice sheet show an increase of the area affected by progressive melt of snow and ice, thus resulting in production of the additional meltwater. In 2011, an important storage of meltwater in the firn has been observed in the S-E Greenland. This water does not freeze during the wintertime and forms a perennial firn aquifer. The aquifer spatial extent has been initially monitored with combined ground and airborne radar observations, but these geophysical techniques are not able to inform us on the amount of meltwater stored at depth. In this study, we use the magnetic resonance soundings (MRS) method for estimating the volume of water stored in the Greenland ice sheet firn and mapping its spatial variability. Our study area covers a firn aquifer along a 16-km E-W transect, ranging between elevations of 1520 and 1760â¯m. In July 2015 and July 2016, we performed MRS measurements that allow estimating the water volume in the studied area as well as the one-year water volume evolution. Water storage is not homogeneous, fluctuating between 0.2 and 2â¯m3/m2, and contains discontinuities in the hydrodynamic properties. We estimate an average volume of water stored in the firn in 2016 to be 0.76â¯m3/m2, which corresponds to a 0.76-m-thick layer of bulk water. MRS monitoring reveals that from April 2015 to July 2016 the volume of water stored at the location of our transect increases by about 36%. We found MRS-estimated depth to water in a good agreement with that obtained with the ground penetrating radar (GPR).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Applied Geophysics - Volume 150, March 2018, Pages 11-20
Journal: Journal of Applied Geophysics - Volume 150, March 2018, Pages 11-20
نویسندگان
Anatoly Legchenko, Clément Miège, Lora S. Koenig, Richard R. Forster, Olivia Miller, D.K. Solomon, Nicholas Schmerr, Lynn Montgomery, Stefan Ligtenberg, Ludovic Brucker,