Results 31 to 40 of about 28,822 (198)

Nitrate stable isotopes and major ions in snow and ice samples from four Svalbard sites [PDF]

, 2015
Increasing reactive nitrogen (N-r) deposition in the Arctic may adversely impact N-limited ecosystems. To investigate atmospheric transport of N-r to Svalbard, Norwegian Arctic, snow and firn samples were collected from glaciers and analysed to define ...
Aanes R., Alina Marca, Amoroso A., Atkin O.K, Beaudon E., Beine H.J., Björkman M.P, Björkman M.P., Björkman M.P., Blunier T., Bottenheim J.W., Brimblecombe P., Burkhart J.F., Carmen P. Vega, Carroll M.A., Casciotti K.L., Coplen T.B., Dibb J.E., Dickson L.G, Draxler R.R., Elisabeth Isaksson, Eneroth K., Felix J.D., Forsström S., Freyer H.D, Freyer H.D., Førland E.J., Gibbons J.D., Goto-Azuma K., Hastings M.G, Hastings M.G., Hastings M.G., Heaton T.H.E, Heaton T.H.E., Hisdal V, Honrath R.E., Honrath R.E., Jan Kaiser, Jarvis J.C., Kahl J.D.W., Kaiser J., Kang S., Kekonen T., Kühnel R., Kühnel R., Li D., Liu S.C., Mats P. Björkman, Michalski G., Morin S., Morin S., Morin S., Morin S., Mosier A.R., Nuth C., Pohjola V.A., Rickard Pettersson, Rinnan R., Ruggirello R.M., Röthlisberger R., Samyn D., Schuler T.V., Semb A., Shaver G.R., Stohl A., Tõnu Martma, Vega C.P., Veijo A. Pohjola, Wolff E.W, Xu L.   +69 more
core   +2 more sources

The impact of ice layers on gas transport through firn at the North Greenland Eemian Ice Drilling (NEEM) site, Greenland [PDF]

The Cryosphere, 2014
Typically, gas transport through firn is modeled in the context of an idealized firn column. However, in natural firn, imperfections are present, which can alter transport dynamics and therefore reduce the accuracy of reconstructed climate records.
K. Keegan, M. R. Albert, I. Baker
doaj   +1 more source

Investigating firn structure and density in the accumulation area of the Grosser Aletschgletscher using ground-penetrating radar [PDF]

The Cryosphere
The role of firn structure and density in geodetic glacier mass balance estimation has been constrained, with studies in alpine conditions primarily relying on models.
A. M. Patil, A. M. Patil, C. Mayer, T. Seehaus, A. R. Groos, A. Bauder, A. Bauder   +6 more
doaj   +1 more source

Firn-air Modelling in the Community Firn Model

, 2023
Abstract: Over the last glacial period, a series of 25 climate fluctuations were observed, characterized by rapid warming followed by a longer cooling period. One of these Dansgaard-Oescher (D-O) events happened around 11,500 years ago and heralded the end of the ice age and the beginning of the Holocene period.
openaire   +2 more sources

Seasonal deuterium excess in a Tien Shan ice core: Influence of moisture transport and recycling in Central Asia [PDF]

, 2003
Stable water isotope (δ18O, δD) data from a high elevation (5100 masl) ice core recovered from the Tien Shan Mountains, Kyrgyzstan, display a seasonal cycle in deuterium excess (d = δD − 8*δ18O) related to changes in the regional hydrologic cycle during ...
Aizen, V, Cecil, L DeWayne, Kreutz, K, Synal, Hans-Arno, Wake, Cameron P   +4 more
core   +3 more sources

Melt regimes, internal stratigraphy, and flow dynamics of three glaciers in the Alaska Range [PDF]

, 2012
We used ground-penetrating radar (GPR), GPS and glaciochemistry to evaluate melt regimes and ice depths, important variables for mass-balance and ice-volume studies, of Upper Yentna Glacier, Upper Kahiltna Glacier and the Mount Hunter ice divide, Alaska.
Arcone, Steven, Campbell, Seth, Introne, Douglas, Kreutz, K, Osterberg, Erich, Volkening, Kevin, Wake, Cameron P, Winski, Dominic   +7 more
core   +2 more sources

Development of an atmospheric N2O isotopocule model and optimization procedure, and application to source estimation [PDF]

, 2015
This paper presents the development of an atmospheric N2O isotopocule model based on a chemistry-coupled atmospheric general circulation model (ACTM). We also describe a simple method to optimize the model and present its use in estimating the isotopic ...
Jan, Kaiser, Kaiser, Jan, KENGO, SUDO, KENTARO, ISHIJIMA, MASAYUKI, TAKIGAWA, NAOHIRO, YOSHIDA, Roeckmann, Thomas, Sakae, Toyoda, SATOSHI, SUGAWARA, Shinji, Morimoto, Shuji, Aoki, Takakiyo, Nakazawa, Thomas, Roeckmann, 中澤, 高清, 吉田, 尚弘, 森本, 真司, 滝川, 雅之, 石島, 健太郎, 菅原, 敏, 豊田, 栄, 青木, 周二, 須藤, 健悟   +21 more
core   +1 more source

A cold laboratory hyperspectral imaging system to map grain size and ice layer distributions in firn cores [PDF]

The Cryosphere
The Greenland and Antarctic ice sheets are covered in a layer of porous firn. Knowledge of firn structure improves our understanding of ice sheet mass balance, supra- and englacial hydrology, and ice core paleoclimate records.
I. E. McDowell, I. E. McDowell, K. M. Keegan, S. M. Skiles, C. P. Donahue, E. C. Osterberg, R. L. Hawley, H.-P. Marshall   +7 more
doaj   +1 more source

Firn Evolution at Camp Century, Greenland: 1966–2100

Frontiers in Earth Science, 2021
Camp Century is an American military base built in 1959 under the surface of the Greenland ice sheet and decommissioned in 1967. Here, we use outputs from RACMO2.3p2 and CanESM2 climate models, adjusted to meteorological observations, and a firn model to
Baptiste Vandecrux, William Colgan, Anne M. Solgaard, Jørgen Peder Steffensen, Nanna B. Karlsson   +4 more
doaj   +1 more source

Radioglaciological studies on Hurd Peninsula glaciers, Livingston Island, Antarctica [PDF]

, 2009
We present the results of several radio-echo sounding surveys carried out on Johnsons and Hurd Glaciers, Livingston Island, Antarctica, between the 1999/2000 and 2004/05 austral summer campaigns, which included both radar profiling and common-midpoint ...
Ahlstrom, L.P., Lapazaran Izargain, Javier Jesús, Macheret, Yu, Machío, F., Navarro Valero, Francisco Jose, Otero García, Jaime, Vasilenko, Evgeniy   +6 more
core   +2 more sources