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Title |
Nitrogen and carbon isotope values of individual amino acids: a tool to study foraging ecology of penguins in the Southern Ocean |
Type |
Journal Article |
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Year |
2009 |
Publication |
Mar Ecol Prog Ser |
Abbreviated Journal |
Mar. Ecol. Prog. Ser. |
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Volume |
391 |
Issue |
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Pages |
293 -306 |
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109 |
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0171-8630 |
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yes |
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Call Number |
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Serial |
1931 |
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Author |
Matter Alexis, Delbo Marco, Ligori Sebastiano, Crouzet Nicolas, Tanga Paolo, |
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Title |
Determination of physical properties of the Asteroid (41) Daphne from interferometric observations in the thermal infrared
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Type |
Journal Article |
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Year |
2011 |
Publication |
Icarus |
Abbreviated Journal |
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Volume |
215 |
Issue |
1 |
Pages |
47-56 |
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Keywords |
Asteroids, Asteroids, Surfaces, Infrared observations, Data reduction techniques, |
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Abstract |
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Programme |
1066 |
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ISSN |
0019-1035 |
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Approved |
yes |
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Call Number |
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Serial |
3455 |
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Title |
Ionospheric signatures of plasma injections in the cusp triggered by solar wind pressure pulses |
Type |
Journal Article |
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Year |
2005 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
110 |
Issue |
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Pages |
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Keywords |
flux transfer events; cusp; reconnection; flow bursts; solar wind pressure; 2463 Ionosphere: Plasma convection; 2712 Magnetospheric Physics: Electric fields; 2716 Magnetospheric Physics: Energetic particles: precipitating; 2736 Magnetospheric Physics: Magnetosphere/ionosphere interactions; 2784 Magnetospheric Physics: Solar wind/magnetosphere interactions |
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Abstract |
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Programme |
312;911 |
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Publisher |
American Geophysical Union |
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ISSN |
0148-0227 |
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Approved |
yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5608 |
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Title |
Tide-modulated Icequakes in the Mertz Glacier Grounding Area, East Antarctica |
Type |
Conference - International - Communication |
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Year |
2013 |
Publication |
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Programme |
1003 |
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Approved |
yes |
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Call Number |
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Serial |
4773 |
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Author |
Gouttevin I, Menegoz M, Domin F, Krinner G, Koven C, Ciais P, Tarnocai C, Boike J, |
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Title |
How the insulating properties of snow affect soil carbon distribution in the continental pan-Arctic area
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Type |
Journal Article |
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Year |
2012 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
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Volume |
117 |
Issue |
G2 |
Pages |
G02020- |
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Keywords |
Arctic, land-surface model, permafrost, snow, snow insulation, soil carbon, 0414 Biogeosciences: Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912), 0475 Biogeosciences: Permafrost, cryosphere, and high-latitude processes (0702, 0716), 1622 Global Change: Earth system modeling (1225, 4316), |
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Abstract |
We demonstrate the effect of an ecosystem differentiated insulation by snow on the soil thermal regime and on the terrestrial soil carbon distribution in the pan-Arctic area. This is done by means of a sensitivity study performed with the land surface model ORCHIDEE, which furthermore provides a first quantification of this effect. Based on field campaigns reporting higher thermal conductivities and densities for the tundra snowpack than for taiga snow, two distributions of near-equilibrium soil carbon stocks are computed, one relying on uniform snow thermal properties and the other using ecosystem-differentiated snow thermal properties. Those modeled distributions strongly depend on soil temperature through decomposition processes. Considering higher insulation by snow in taiga areas induces warmer soil temperatures by up to 12 K in winter at 50 cm depth. This warmer soil signal persists over summer with a temperature difference of up to 4 K at 50 cm depth, especially in areas exhibiting a thick, enduring snow cover. These thermal changes have implications on the modeled soil carbon stocks, which are reduced by 8% in the pan-Arctic continental area when the vegetation-induced variations of snow thermal properties are accounted for. This is the result of diverse and spatially heterogeneous ecosystem processes: where higher soil temperatures lift nitrogen limitation on plant productivity, tree plant functional types thrive whereas light limitation and enhanced water stress are the new constrains on lower vegetation, resulting in a reduced net productivity at the pan-Arctic scale. Concomitantly, higher soil temperatures yield increased respiration rates (+22% over the study area) and result in reduced permafrost extent and deeper active layers which expose greater volumes of soil to microbial decomposition. The three effects combine to produce lower soil carbon stocks in the pan-Arctic terrestrial area. Our study highlights the role of snow in combination with vegetation in shaping the distribution of soil carbon and permafrost at high latitudes.
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Programme |
1017 |
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Corporate Author |
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Thesis |
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Publisher |
AGU |
Place of Publication |
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Series Editor |
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Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0148-0227 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
776 |
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| Permanent link to this record |
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Author |
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Title |
How the insulating properties of snow affect soil carbon distribution in the continental pan-Arctic area
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Type |
Journal Article |
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Year |
2012 |
Publication |
Journal of Geophysical Research: Biogeosciences |
Abbreviated Journal |
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Volume |
117 |
Issue |
G2 |
Pages |
G02020- |
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Keywords |
Arctic, land-surface model, permafrost, snow, snow insulation, soil carbon, 0414 Biogeochemical cycles, processes, and modeling, 0475 Permafrost, cryosphere, and high-latitude processes, 1622 Earth system modeling, |
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Abstract |
We demonstrate the effect of an ecosystem differentiated insulation by snow on the soil thermal regime and on the terrestrial soil carbon distribution in the pan-Arctic area. This is done by means of a sensitivity study performed with the land surface model ORCHIDEE, which furthermore provides a first quantification of this effect. Based on field campaigns reporting higher thermal conductivities and densities for the tundra snowpack than for taiga snow, two distributions of near-equilibrium soil carbon stocks are computed, one relying on uniform snow thermal properties and the other using ecosystem-differentiated snow thermal properties. Those modeled distributions strongly depend on soil temperature through decomposition processes. Considering higher insulation by snow in taiga areas induces warmer soil temperatures by up to 12 K in winter at 50 cm depth. This warmer soil signal persists over summer with a temperature difference of up to 4 K at 50 cm depth, especially in areas exhibiting a thick, enduring snow cover. These thermal changes have implications on the modeled soil carbon stocks, which are reduced by 8% in the pan-Arctic continental area when the vegetation-induced variations of snow thermal properties are accounted for. This is the result of diverse and spatially heterogeneous ecosystem processes: where higher soil temperatures lift nitrogen limitation on plant productivity, tree plant functional types thrive whereas light limitation and enhanced water stress are the new constrains on lower vegetation, resulting in a reduced net productivity at the pan-Arctic scale. Concomitantly, higher soil temperatures yield increased respiration rates (+22% over the study area) and result in reduced permafrost extent and deeper active layers which expose greater volumes of soil to microbial decomposition. The three effects combine to produce lower soil carbon stocks in the pan-Arctic terrestrial area. Our study highlights the role of snow in combination with vegetation in shaping the distribution of soil carbon and permafrost at high latitudes.
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Programme |
1042 |
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Campaign |
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ISSN |
2156-2202 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
4154 |
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Author |
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Title |
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Type |
Conference - International - Communication |
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Year |
2011 |
Publication |
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Abbreviated Journal |
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Volume |
Abstract for AGU session V05 |
Issue |
Constraining the Dynamics of Volcanic Jets and Plu |
Pages |
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Keywords |
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Abstract |
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Programme |
316 |
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Approved |
yes |
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Call Number |
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Serial |
3245 |
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Author |
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Title |
Non-English languages enrich scientific knowledge: The example of economic costs of biological invasions |
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Journal |
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Year |
2021 |
Publication |
Science of The Total Environment |
Abbreviated Journal |
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Volume |
775 |
Issue |
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Pages |
144441 |
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Keywords |
Ecological bias InvaCost Knowledge gaps Management Native languages Stakeholders |
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Abstract |
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Programme |
136 |
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Series Title |
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Series Issue |
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Edition |
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ISSN |
0048-9697 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
7973 |
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Author |
Weisen Shen, Douglas A. Wiens, Sridhar Anandakrishnan, Richard C. Aster, Peter Gerstoft, Peter D. Bromirski, Samantha E. Hansen, Ian W. D. Dalziel, David S. Heeszel, Audrey D. Huerta, Andrew A. Nyblade, Ralph Stephen, Terry J. Wilson, J. Paul Winberry |
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Title |
The Crust and Upper Mantle Structure of Central and West Antarctica From Bayesian Inversion of Rayleigh Wave and Receiver Functions |
Type |
Journal |
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Year |
2018 |
Publication |
Journal of Geophysical Research: Solid Earth |
Abbreviated Journal |
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Volume |
123 |
Issue |
9 |
Pages |
7824-7849 |
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Keywords |
ambient noise tomography Antarctica crust and uppermost mantle Gamburtsev Mountains seismology Transantarctic Mountains |
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Abstract |
We construct a new seismic model for central and West Antarctica by jointly inverting Rayleigh wave phase and group velocities along with P wave receiver functions. Ambient noise tomography exploiting data from more than 200 seismic stations deployed over the past 18 years is used to construct Rayleigh wave phase and group velocity dispersion maps. Comparison between the ambient noise phase velocity maps with those constructed using teleseismic earthquakes confirms the accuracy of both results. These maps, together with P receiver function waveforms, are used to construct a new 3-D shear velocity (Vs) model for the crust and uppermost mantle using a Bayesian Monte Carlo algorithm. The new 3-D seismic model shows the dichotomy of the tectonically active West Antarctica (WANT) and the stable and ancient East Antarctica (EANT). In WANT, the model exhibits a slow uppermost mantle along the Transantarctic Mountains (TAMs) front, interpreted as the thermal effect from Cenozoic rifting. Beneath the southern TAMs, the slow uppermost mantle extends horizontally beneath the traditionally recognized EANT, hypothesized to be associated with lithospheric delamination. Thin crust and lithosphere observed along the Amundsen Sea coast and extending into the interior suggest involvement of these areas in Cenozoic rifting. EANT, with its relatively thick and cold crust and lithosphere marked by high Vs, displays a slower Vs anomaly beneath the Gamburtsev Subglacial Mountains in the uppermost mantle, which we hypothesize may be the signature of a compositionally anomalous body, perhaps remnant from a continental collision. |
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Programme |
133 |
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Summary Language |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2169-9356 |
ISBN |
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Expedition |
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Conference |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
7878 |
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Author |
Lukianova R, Hanuise C, Christiansen F, |
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Title |
Asymmetric distribution of the ionospheric electric potential in the opposite hemispheres as inferred from the SuperDARN observations and FAC-based convection model
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Type |
Journal Article |
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Year |
2008 |
Publication |
Journal of Atmospheric and Solar-Terrestrial Physics |
Abbreviated Journal |
1364-6826 |
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Volume |
70 |
Issue |
18 |
Pages |
2324-2335 |
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Keywords |
Ionosphere, Convection, Field-aligned currents, SuperDARN, |
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Abstract |
We compare the SuperDARN convection patterns with the predictions of a new numerical model of the global distribution of ionospheric electric potentials. The model utilizes high-precision statistical maps of field-aligned currents (FAC) derived from measurements made by polar-orbiting low-altitude satellites. Both the solar and auroral precipitation contributions are included in order to derive the ionospheric conductance. Taking into account the electrodynamic coupling of the opposite hemispheres, the model allows one to obtain the convection patterns developed simultaneously in both hemispheres for given input parameters. SuperDARN, with its database containing global northern and southern convection maps, provides the unique opportunity to compare the model predictions of electric fields with observations. In the present study we focus on the effect of significant interhemispheric asymmetry governed by the IMF clock angle and solar zenith angle. We calculate the convection patterns for specific cases caused by the sign of BY and season and demonstrate the capability of the FAC-based model reproduce the radar observations. The simulation confirms that the solar zenith angle should be linked to the IMF clock angle to fully characterize the convection patterns. The model predicts that the cross-polar cap potential drop is regularly larger in the winter hemisphere than in the summer hemisphere. |
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Programme |
312;911 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1364-6826 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2743 |
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| Permanent link to this record |
