| Records |
| Author |
Grob M, Maggi A, Stutzmann E, |
| Title |
Observations of the seasonality of the Antarctic microseismic signal, and its association to sea ice variability
|
Type |
Journal Article |
| Year |
2011 |
Publication |
Geophys. Res. Lett. |
Abbreviated Journal |
|
| Volume |
38 |
Issue |
11 |
Pages |
L11302- |
| Keywords |
microseisms, sea, seismic noise, seismology, 0750 Cryosphere: Sea ice, 7299 Seismology: General or miscellaneous, 9310 Geographic Location: Antarctica, |
| Abstract |
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| Programme |
133 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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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 |
0094-8276 |
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 |
|
Approved |
yes |
| Call Number |
|
Serial |
3795 |
| Permanent link to this record |
| |
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| |
| Author |
Priyadarshi, A.; Dominguez, G.; Savarino, J.; Thiemens, M. |
| Title |
Cosmogenic 35S: A unique tracer to Antarctic atmospheric chemistry and the polar vortex |
Type |
Journal Article |
| Year |
2011 |
Publication |
Geophys. Res. Lett. |
Abbreviated Journal |
|
| Volume |
38 |
Issue |
13 |
Pages |
L13808 |
| Keywords |
Antarctica; cosmogenic radionuclide; stratosphere-troposphere mixing; 3307 Atmospheric Processes: Boundary layer processes; 3362 Atmospheric Processes: Stratosphere/troposphere interactions; 3363 Atmospheric Processes: Stratospheric dynamics |
| Abstract |
The cosmogenic radionuclide 35S (half life ∼87 d) exists in both 35SO2 gas and 35SO42− aerosol phase in the atmosphere. Cosmogenic 35S fulfils a unique niche in that it has an ideal half-life for use as a tracer of atmospheric processes, possesses a gas phase precursor and undergoes gas to particle conversion, providing a chronometer that complements other measurements of radiogenic isotopes of different half lives and chemical properties. Based on radiogenic 35S measurements and concomitant model calculations, we demonstrate that 35S is a unique tracer to understand stratospheric-tropospheric air mass transport dynamics and the atmospheric oxidation capacity on a short time scale. Reported are the first measurements of 35S contained in SO42− aerosols (bulk and size aggregated) at Antarctica. 35SO42− concentrations at Dome C and Dumont D'Urville exhibit summer maxima and winter minima with a secondary winter peak. Higher oxidative capacity of the atmosphere and long range transport of mid latitude air increases 35SO42− activity in summer whereas a lack of air mass mixing coupled with low oxidant concentration in winter significantly decreases 35SO42− activity. A 3% contribution from stratospheric 35SO42− into the free troposphere during stratosphere-troposphere air mass mixing accounts for the secondary winter 35SO42− peak. In the future, this work will be extended to 35S activity measurements of both gas and aerosol phases to further understand gas to particle conversion, vortex dynamics and trace polar stratospheric cloud sedimentation frequency. |
| Programme |
1011 |
| Campaign |
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| Address |
|
| Corporate Author |
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Thesis |
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| Publisher |
AGU |
Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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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 |
0094-8276 |
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 |
|
Approved |
yes |
| Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
6064 |
| Permanent link to this record |
| |
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| |
| Author |
Favier Vincent, Agosta Ccile, Genthon Christophe, Arnaud Laurent, Trouvillez Alexandre, Galle Hubert, |
| Title |
Modeling the mass and surface heat budgets in a coastal blue ice area of Adelie Land, Antarctica
|
Type |
Journal Article |
| Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
0148-0227 |
| Volume |
116 |
Issue |
F3 |
Pages |
F03017- |
| Keywords |
Antarctica, blue ice, cryosphere, energy balance, melting, 0738 Cryosphere: Ice (1863), 0762 Cryosphere: Mass balance (1218, 1223), 0764 Cryosphere: Energy balance, 0768 Cryosphere: Thermal regime, 0798 Cryosphere: Modeling (1952, 4316), |
| Abstract |
Meteorological data recorded from 12 December 2008 to 30 June 2010 were analyzed to assess the surface energy balance (SEB) in a blue ice area of Cap Prudhomme, Adelie Land (6641′S, 13955′E). The SEB was computed with a newly developed model forced by direct measurements and with a voluntarily limited number of parameters to better assess model sensitivity. Incoming short-wave radiation was corrected for the slope and orientation of the local terrain assuming direct and diffuse radiation components. Turbulent heat fluxes were assessed using the bulk aerodynamic approach. Heat conduction in the ice was computed by solving the thermal diffusion equation. Snow accumulation was modeled using ERA interim total precipitation and a one-dimensional erosion model. The surface heat budget and accumulation/erosion model accurately reproduced field observations. The occurrence of blue ice is linked with higher rates of erosion than in the surrounding snow covered areas, which may be caused by local flow divergence or snow not being redistributed from higher elevations. Melting occurs between December and February when incoming short-wave radiation is high. However, the SEB was closely linked to air temperature through the incoming long-wave radiation and the turbulent sensible heat flux. Several warm events caused by cyclones intruding into the continent led to significant warming of the ice and high melting rates. Intruding cyclones were also associated with high precipitation that led to significant accumulation. Except in blue ice areas, modeling suggests that expected higher precipitation in a warmer climate will result in more accumulation.
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| Programme |
411;1013 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
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| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
3294 |
| Permanent link to this record |
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| |
| Author |
Bousquet P, Yver C, Pison I, Li Y S, Fortems A, Hauglustaine D, Szopa S, Rayner P J, Novelli P, Langenfelds R, Steele P, Ramonet M, Schmidt M, Foster P, Morfopoulos C, Ciais P, |
| Title |
A three-dimensional synthesis inversion of the molecular hydrogen cycle: Sources and sinks budget and implications for the soil uptake
|
Type |
Journal Article |
| Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
|
| Volume |
116 |
Issue |
D1 |
Pages |
D01302- |
| Keywords |
atmospheric inversion, molecular hydrogen, sources and sinks, H2 budget, H2 soil uptake, 0322 Atmospheric Composition and Structure: Constituent sources and sinks, 0368 Atmospheric Composition and Structure: Troposphere: constituent transport and chemistry, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 0414 Biogeosciences: Biogeochemical cycles, processes, and modeling, 0489 Biogeosciences: Trace element cycling, |
| Abstract |
|
| Programme |
416 |
| Campaign |
|
| Address |
|
| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
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Editor |
|
| Language |
|
Summary Language |
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Original Title |
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| Series Editor |
|
Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
|
Edition |
|
| ISSN |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
3126 |
| Permanent link to this record |
| |
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| |
| Author |
Chevallier F, Ciais P, Conway T J, Aalto T, Anderson B E, Bousquet P, Brunke E G, Ciattaglia L, Esaki Y, Frhlich M, Gomez A, Gomez-Pelaez A J, Haszpra L, Krummel P B, Langenfelds R L, Leuenberger M, Machida T, Maignan F, Matsueda H, Morgu J A, Mukai H, Nakazawa T, Peylin P, Ramonet M, Rivier L, Sawa Y, Schmidt M, Steele L P, Vay S A, Vermeulen A T, Wofsy S, Worthy D, |
| Title |
CO2 surface fluxes at grid point scale estimated from a global 21 year reanalysis of atmospheric measurements
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Type |
Journal Article |
| Year |
2010 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
|
| Volume |
115 |
Issue |
D21 |
Pages |
D21307- |
| Keywords |
CO2, flux inversion, 0322 Atmospheric Composition and Structure: Constituent sources and sinks, 0428 Biogeosciences: Carbon cycling, 3315 Atmospheric Processes: Data assimilation, 3260 Mathematical Geophysics: Inverse theory, |
| Abstract |
|
| Programme |
416 |
| Campaign |
|
| Address |
|
| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
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Editor |
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| Language |
|
Summary Language |
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Original Title |
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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 |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
3239 |
| Permanent link to this record |
| |
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| |
| Author |
Jardon F P, Bouruet-Aubertot P, Cuypers Y, Vivier F, Lourenço A, |
| Title |
Internal waves and vertical mixing in the Storfjorden Polynya, Svalbard
|
Type |
Journal Article |
| Year |
2011 |
Publication |
Journal of Geophysical Research: Oceans |
Abbreviated Journal |
|
| Volume |
116 |
Issue |
C12 |
Pages |
C12040- |
| Keywords |
Garret and Munk model, Thorpe scale, barotropic tides, internal waves, latent heat polynya, vertical mixing, 4207 Arctic and Antarctic oceanography, 4544 Internal and inertial waves, 4572 Upper ocean and mixed layer processes, |
| Abstract |
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| Programme |
1015 |
| Campaign |
|
| Address |
|
| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
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| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
2156-2202 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
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Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
1114 |
| Permanent link to this record |
| |
|
| |
| Author |
Houssais Marie-Nolle, Herbaut Christophe, |
| Title |
Atmospheric forcing on the Canadian Arctic Archipelago freshwater outflow and implications for the Labrador Sea variability
|
Type |
Journal Article |
| Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
0148-0227 |
| Volume |
116 |
Issue |
|
Pages |
C00D02- |
| Keywords |
Arctic Ocean, freshwater, North Atlantic Oscillation, 4207 Oceanography: General: Arctic and Antarctic oceanography, 4215 Oceanography: General: Climate and interannual variability, 4255 Oceanography: General: Numerical modeling, |
| Abstract |
The variability of the freshwater export through the Canadian Arctic Archipelago (CAA) is analyzed using a hindcast simulation forced by surface atmospheric forcing from the ERA40 reanalysis (1958–2001). Although the two channels representing the archipelago in the model are both sensitive to the along-channel sea surface height (SSH) gradient, they appear to have very distinct behaviors. The outflow to Lancaster Sound is shown to be largely controlled by the magnitude of the upstream SSH gradient across McClure Strait. The gradient shows a close link to the wind stress curl in the western Arctic but also to a large-scale SSH anomaly pattern which has a strong signal over the shelf to the south of McClure Strait. The latter has, however, little statistical connection to the SSH variability in the Beaufort Gyre. By contrast, the outflow through Nares Strait responds preferentially to SSH variations in the northern Baffin Bay which are remotely forced by air-sea heat exchanges in the Labrador Sea. The variability is largely coherent between the two outflows and is controlled by a dipolar atmospheric pattern reminiscent of the North Atlantic/Arctic Oscillation. When entering the subpolar gyre, the CAA freshwater outflow remains confined to the Labrador shelf with little impact on the salinity of the interior Labrador Sea and potentially on the convection. The latter is represented by a distinct mode of salinity variability in the western subpolar gyre which is rather influenced by the variability of the sea ice export through Fram Strait.
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| Programme |
452 |
| Campaign |
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| Address |
|
| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
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Editor |
|
| Language |
|
Summary Language |
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Original Title |
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| Series Editor |
|
Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
|
Edition |
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| ISSN |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
3604 |
| Permanent link to this record |
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| |
| Author |
Chevallier Frédéric, Engelen Richard J, Carouge Claire, Conway Thomas J, Peylin Philippe, Pickett-Heaps Christopher, Ramonet Michel, Rayner Peter J, Xueref-Remy Irne, |
| Title |
AIRS-based versus flask-based estimation of carbon surface fluxes |
Type |
Journal Article |
| Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
| Volume |
114 |
Issue |
D20 |
Pages |
D20303 - |
| Keywords |
CO 2 surface fluxes, inverse method, AIRS satellite data, 0322 Atmospheric Composition and Structure: Constituent sources and sinks, 0428 Biogeosciences: Carbon cycling, 0480 Biogeosciences: Remote sensing, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 3315 Atmospheric Processes: Data assimilation, |
| Abstract |
This paper demonstrates an inversion of surface CO2 fluxes using concentrations derived from assimilation of satellite radiances. Radiances come from the Atmospheric Infrared Sounder (AIRS) and are assimilated within the system of the European Centre for Medium-Range Weather Forecasts. We evaluate the quality of the inverted fluxes by comparing simulated concentrations with independent airborne measurements. As a benchmark we use an inversion based on surface flask measurements and another using only the global concentration trend. We show that the AIRS-based inversion is able to improve the match to the independent data compared to the prior estimate but that it usually performs worse than either the flask-based or trend-based inversion. |
| Programme |
416 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
AGU |
Place of Publication |
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Editor |
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| Language |
|
Summary Language |
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Original Title |
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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 |
|
Edition |
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| ISSN |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
1837 |
| Permanent link to this record |
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| |
| Author |
Sciare J, Favez O, Sarda-Estve R, Oikonomou K, Cachier H, Kazan V, |
| Title |
Long-term observations of carbonaceous aerosols in the Austral Ocean atmosphere: Evidence of a biogenic marine organic source
|
Type |
Journal Article |
| Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
| Volume |
114 |
Issue |
D15 |
Pages |
D15302 - |
| Keywords |
organic aerosols, black carbon, biogenic aerosols, Austral Ocean, chlorophyll a, 0305 Atmospheric Composition and Structure: Aerosols and particles, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 3339 Atmospheric Processes: Ocean/atmosphere interactions, |
| Abstract |
Long-term observations of carbonaceous aerosols in the Austral Ocean are reported here for the first time from almost 5 years of continuous filter sampling performed at Amsterdam Island (3748S, 7734E). Black carbon concentrations determined by optical method were among the lowest reported for marine atmosphere, with monthly mean levels ranging from 2–5 ng C/m3 during summer to 7–13 ng C/m3 during winter. A clear seasonal pattern was also observed for organic aerosols, but in opposite phase, with maximum values during the austral summer period (>250 ng C/m3) and minimum concentrations (100 ng C/m3) during winter. This seasonal variation of organic concentration was found to be almost entirely related to the water-insoluble organic carbon fraction, suggesting a primary origin for these organics, most probably through bubble bursting processes. Moreover, this summer maximum observed for organic aerosols was found to be correlated with satellite-derived chlorophyll a concentrations averaged over an oceanic region upwind of the sampling site and characterized by relatively high biogenic activity. This oceanic region being located at 1000–2000 km far away from the monitoring station, atmospheric ageing may have played a significant role on the levels and size-resolved properties of marine organics collected at Amsterdam Island. This biogenic marine organic source of primary origin in the Austral Ocean is fully consistent with similar observations previously reported for the Northern Atlantic Ocean and brings further evidences of the major role of marine organic emissions over remote oceanic regions.
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| Programme |
414;415;416 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
|
Editor |
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| Language |
|
Summary Language |
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Original Title |
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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 |
|
| ISSN |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
1819 |
| Permanent link to this record |
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| |
| Author |
Schlichtholz P, Houssais M-N, |
| Title |
Forcing of oceanic heat anomalies by air-sea interactions in the Nordic Seas area
|
Type |
Journal Article |
| Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
0148-0227 |
| Volume |
116 |
Issue |
C1 |
Pages |
C01006- |
| Keywords |
Nordic Seas, heat anomalies, air-sea interactions, interanual variability, Atlantic water, 4215 Oceanography: General: Climate and interannual variability, 4504 Oceanography: Physical: Air/sea interactions, 4207 Oceanography: General: Arctic and Antarctic oceanography, 4263 Oceanography: General: Ocean predictability and prediction, 4572 Oceanography: Physical: Upper ocean and mixed layer processes, |
| Abstract |
Hydrographic data and atmospheric reanalysis from 1982 to 2005 are used to show a strong link of the Atlantic water temperature (AWT) anomalies observed in the transition zone between the Norwegian Atlantic current and the West Spitsbergen current in summer to the surface heat flux (SHF) anomalies observed over the Barents Sea open water in the preceding late winter. A mechanism proposed for this link is formation of ocean temperature anomalies in a deep mixed layer and their subsequent westward export by a branch of Atlantic water recirculating in the western Barents Sea. The SHF anomalies over the Barents Sea are due to advection of temperature and humidity by anomalous winds across the Arctic ice edge and do not strongly depend on the North Atlantic oscillation (NAO). Correlations of up to about 0.9 between the AWT anomalies and indices of atmospheric variability over the Barents Sea open prospects for seasonal AWT predictability. It is also shown that the wind-forcing responsible for positive AWT anomalies is involved in a cyclonic perturbation of the atmospheric circulation over the Nordic Seas. This perturbation generates, through influence on the sea ice distribution, a lobe of SHF anomalies in the marginal ice zone (MIZ) on the eastern (Barents Sea) and western (Greenland Sea) sides of the Nordic Seas which has the opposite sign to the open water lobe. In contrast to the Barents Sea MIZ, the diabatic heating of the atmosphere by upward SHF anomalies in the Greenland Sea MIZ competes with cold advection.
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| Programme |
452 |
| Campaign |
|
| Address |
|
| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
AGU |
Place of Publication |
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Editor |
|
| Language |
|
Summary Language |
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Original Title |
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| Series Editor |
|
Series Title |
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Abbreviated Series Title |
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| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0148-0227 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
3602 |
| Permanent link to this record |
