Snow accumulation variability in Wilkes Land, East Antarctica, and the relationship to atmospheric ridging in the 130°–170°E region since 1930
Identifieur interne : 00AE90 ( Main/Exploration ); précédent : 00AE89; suivant : 00AE91Snow accumulation variability in Wilkes Land, East Antarctica, and the relationship to atmospheric ridging in the 130°–170°E region since 1930
Auteurs : I. Goodwin [Australie] ; M. De Angelis [France] ; M. Pook [Australie] ; N. W. Young [Australie]Source :
- Journal of Geophysical Research: Atmospheres [ 0148-0227 ] ; 2003-11-16.
Descripteurs français
- Pascal (Inist)
- Accumulation neige, Antarctique, Australie, Carotte, Circulation atmosphérique, Cyclolyse, Fluctuation, Gradient pression, Hauteur géopotentielle, Hiver, Inlandsis, Intensification, Ionosphère région E, Masse air, Mode annulaire, Neige, Niveau mer, Nouvelle Zélande, Névé, Onde longue, Série temporelle, Taux accumulation, Trajectoire, Troposphère, Variation annuelle, Variation interannuelle, Vent surface, Vent zonal.
- Wicri :
- geographic : Australie.
- topic : Antarctique, Cyclone, Sciences de la vie.
English descriptors
- KwdEn :
- Accumulation, Accumulation rate, Accumulation rates, Accumulation time series, Air mass, Anare, Annular mode, Anomaly, Anomaly plots, Antarctic, Antarctic precipitation, Antarctic snow, Antarctica, Atmospheric circulation, Atmospheric dynamics, Atmospheric ridging, Austral, Austral winter, Australia, Australian antarctic division, Brightness temperature, Bromwich, Circulation pattern, Circumpolar, Circumpolar structure, Circumpolar trough, Clim, Climatology period, Core locations, Correlation analysis, Correlation pattern, Correlation values, Cyclolysis, Cyclone, Cyclone trajectories, Cyclonic activity, Decadal fluctuations, Density variations, East antarctic, East antarctic plateau, East antarctica, Eastern wilkes land, Elevation range, European space satellite, Firn, Firn core, Firn cores, Firn densification, Fluctuation, Fresh snow, Geophys, Geopotential, Geopotential height, Geopotential height data, Glaciol, Goodwin, Grain size, Gross beta radioactivity, High index phase, High pressure, High ratio, High surface pressure, Hydrogen peroxide, Incursion, Intensification, Interannual, Interannual variability, Interannual variation, Interannual variations, Interdecadal, Ionospheric E region, Isotope, Katabatic, Katabatic winds, Large interdecadal variability, Late summer, Legrand, Level pressure, Life sciences, Long wave, Longitude, Longitude band, Lower accumulation rates, Macquarie island, Mass incursions, Mayewski, Mslp, Mslp difference, Mslp index, Mulvaney, New Zealand, Nitrate, Nitrate concentration, Other wilkes land sites, Overall trend, Photochemical reactions, Physical temperature, Polar snow, Polar vortex, Poleward shift, Polyethylene bags, Pook, Postdepositional, Postdepositional processes, Precipitable water, Precipitation, Pressure field, Pressure gradient, Proxy climate data, Reanalysis project, Redistribution, Research centre, Ridging, Saint martin france, Scott base, Sheet slope, Sheet topography, Significance level, Significant differences, Snow accumulation, Snow accumulation rate, Snow accumulation rates, Snow accumulation time series, Snow accumulation variability, Snow accumulation variability figure, Snow chemistry data, Snow redistribution, Snow remobilization, Snow surface, Solid line, Southern annular mode, Southern hemisphere, Southern ocean, Spatial plot, Spatial variability, Stake measurements, Stratigraphic methods, Strong pressure gradient, Strong surface wind events, Strong wind events, Subantarctic stations, Surface pressure, Surface snow, Surface topography, Surface wind, Surface wind vectors, Synoptic, Synoptic pattern, Tasmania, Temporal accumulation pattern, Temporal variability, Terre adelie, Thin line, Time series, Time series plot, Topographic ridge, Tropospheric ridging, Trough, Upper level ridging, Variability, Wilkes, Wilkes land, Wilkes land coast, Wilkes land region, Winter, Year period, Zonal, Zonal wind, Zonal wind data, annual variations, atmospheric circulation, drill cores, firn, fluctuations, ice sheets, sea level, snow, trajectory, troposphere.
- Teeft :
- Accumulation, Accumulation rate, Accumulation rates, Accumulation time series, Anare, Anomaly, Anomaly plots, Antarctic, Antarctic precipitation, Antarctic snow, Antarctica, Atmospheric circulation, Atmospheric dynamics, Atmospheric ridging, Austral, Austral winter, Australian antarctic division, Brightness temperature, Bromwich, Circulation pattern, Circumpolar, Circumpolar structure, Circumpolar trough, Clim, Climatology period, Core locations, Correlation analysis, Correlation pattern, Correlation values, Cyclolysis, Cyclone, Cyclone trajectories, Cyclonic activity, Decadal fluctuations, Density variations, East antarctic, East antarctic plateau, East antarctica, Eastern wilkes land, Elevation range, European space satellite, Firn, Firn core, Firn cores, Firn densification, Fluctuation, Fresh snow, Geophys, Geopotential, Geopotential height, Geopotential height data, Glaciol, Goodwin, Grain size, Gross beta radioactivity, High index phase, High pressure, High ratio, High surface pressure, Hydrogen peroxide, Incursion, Interannual, Interannual variability, Interannual variations, Interdecadal, Isotope, Katabatic, Katabatic winds, Large interdecadal variability, Late summer, Legrand, Level pressure, Life sciences, Longitude, Longitude band, Lower accumulation rates, Macquarie island, Mass incursions, Mayewski, Mslp, Mslp difference, Mslp index, Mulvaney, Nitrate, Nitrate concentration, Other wilkes land sites, Overall trend, Photochemical reactions, Physical temperature, Polar snow, Polar vortex, Poleward shift, Polyethylene bags, Pook, Postdepositional, Postdepositional processes, Precipitable water, Precipitation, Pressure field, Pressure gradient, Proxy climate data, Reanalysis project, Redistribution, Research centre, Ridging, Saint martin france, Scott base, Sheet slope, Sheet topography, Significance level, Significant differences, Snow accumulation, Snow accumulation rate, Snow accumulation rates, Snow accumulation time series, Snow accumulation variability, Snow accumulation variability figure, Snow chemistry data, Snow redistribution, Snow remobilization, Snow surface, Solid line, Southern annular mode, Southern hemisphere, Southern ocean, Spatial plot, Spatial variability, Stake measurements, Stratigraphic methods, Strong pressure gradient, Strong surface wind events, Strong wind events, Subantarctic stations, Surface pressure, Surface snow, Surface topography, Surface wind vectors, Synoptic, Synoptic pattern, Tasmania, Temporal accumulation pattern, Temporal variability, Terre adelie, Thin line, Time series, Time series plot, Topographic ridge, Tropospheric ridging, Trough, Upper level ridging, Variability, Wilkes, Wilkes land, Wilkes land coast, Wilkes land region, Year period, Zonal, Zonal wind data.
Abstract
Wilkes Land annual snow accumulation variability is explored together with ice core chemistry data as proxies for circumpolar atmospheric circulation in the 110°E–135°E sector of the circumpolar trough. Four accumulation time series spanning 1930–1985 show a pattern of accumulation related to maritime air mass incursions over the East Antarctic ice sheet slope, which is regionally consistent on interannual and interdecadal timescales. The temporal accumulation pattern in Wilkes Land shows decadal fluctuations of ±10%. Both these fluctuations and the overall trend of increasing accumulation since the middle 1960s are consistent with a poleward shift and intensification of the circumpolar trough. This is consistent with a shift toward the high index state of the southern annular mode. Interannual variability of snow accumulation rate throughout Wilkes Land was found to be dependent upon shifts in the preferred tracks of cyclones along or across the coast and in the location of cyclolysis regions. Significant differences in this temporal accumulation pattern over Wilkes Land can occur as a result of the time‐varying location of atmospheric ridging and the circumpolar long‐wave structure south of New Zealand and Australia. Snow accumulation at an additional site (GD09) displays a well‐defined interdecadal pattern, and the mean annual nitrate (NO3−) concentration of snow is correlated to the winter sea level pressure gradient between East Antarctica and the sub‐Antarctic and the upper geopotential height and zonal wind data over East Antarctica. Strong, surface wind drainage during tropospheric ridging in Wilkes Land produces anomalous snow accumulation and annual mean NO3− concentration in firn at GD09.
Url:
DOI: 10.1029/2002JD002995
Affiliations:
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Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Accumulation</term>
<term>Accumulation rate</term>
<term>Accumulation rates</term>
<term>Accumulation time series</term>
<term>Air mass</term>
<term>Anare</term>
<term>Annular mode</term>
<term>Anomaly</term>
<term>Anomaly plots</term>
<term>Antarctic</term>
<term>Antarctic precipitation</term>
<term>Antarctic snow</term>
<term>Antarctica</term>
<term>Atmospheric circulation</term>
<term>Atmospheric dynamics</term>
<term>Atmospheric ridging</term>
<term>Austral</term>
<term>Austral winter</term>
<term>Australia</term>
<term>Australian antarctic division</term>
<term>Brightness temperature</term>
<term>Bromwich</term>
<term>Circulation pattern</term>
<term>Circumpolar</term>
<term>Circumpolar structure</term>
<term>Circumpolar trough</term>
<term>Clim</term>
<term>Climatology period</term>
<term>Core locations</term>
<term>Correlation analysis</term>
<term>Correlation pattern</term>
<term>Correlation values</term>
<term>Cyclolysis</term>
<term>Cyclone</term>
<term>Cyclone trajectories</term>
<term>Cyclonic activity</term>
<term>Decadal fluctuations</term>
<term>Density variations</term>
<term>East antarctic</term>
<term>East antarctic plateau</term>
<term>East antarctica</term>
<term>Eastern wilkes land</term>
<term>Elevation range</term>
<term>European space satellite</term>
<term>Firn</term>
<term>Firn core</term>
<term>Firn cores</term>
<term>Firn densification</term>
<term>Fluctuation</term>
<term>Fresh snow</term>
<term>Geophys</term>
<term>Geopotential</term>
<term>Geopotential height</term>
<term>Geopotential height data</term>
<term>Glaciol</term>
<term>Goodwin</term>
<term>Grain size</term>
<term>Gross beta radioactivity</term>
<term>High index phase</term>
<term>High pressure</term>
<term>High ratio</term>
<term>High surface pressure</term>
<term>Hydrogen peroxide</term>
<term>Incursion</term>
<term>Intensification</term>
<term>Interannual</term>
<term>Interannual variability</term>
<term>Interannual variation</term>
<term>Interannual variations</term>
<term>Interdecadal</term>
<term>Ionospheric E region</term>
<term>Isotope</term>
<term>Katabatic</term>
<term>Katabatic winds</term>
<term>Large interdecadal variability</term>
<term>Late summer</term>
<term>Legrand</term>
<term>Level pressure</term>
<term>Life sciences</term>
<term>Long wave</term>
<term>Longitude</term>
<term>Longitude band</term>
<term>Lower accumulation rates</term>
<term>Macquarie island</term>
<term>Mass incursions</term>
<term>Mayewski</term>
<term>Mslp</term>
<term>Mslp difference</term>
<term>Mslp index</term>
<term>Mulvaney</term>
<term>New Zealand</term>
<term>Nitrate</term>
<term>Nitrate concentration</term>
<term>Other wilkes land sites</term>
<term>Overall trend</term>
<term>Photochemical reactions</term>
<term>Physical temperature</term>
<term>Polar snow</term>
<term>Polar vortex</term>
<term>Poleward shift</term>
<term>Polyethylene bags</term>
<term>Pook</term>
<term>Postdepositional</term>
<term>Postdepositional processes</term>
<term>Precipitable water</term>
<term>Precipitation</term>
<term>Pressure field</term>
<term>Pressure gradient</term>
<term>Proxy climate data</term>
<term>Reanalysis project</term>
<term>Redistribution</term>
<term>Research centre</term>
<term>Ridging</term>
<term>Saint martin france</term>
<term>Scott base</term>
<term>Sheet slope</term>
<term>Sheet topography</term>
<term>Significance level</term>
<term>Significant differences</term>
<term>Snow accumulation</term>
<term>Snow accumulation rate</term>
<term>Snow accumulation rates</term>
<term>Snow accumulation time series</term>
<term>Snow accumulation variability</term>
<term>Snow accumulation variability figure</term>
<term>Snow chemistry data</term>
<term>Snow redistribution</term>
<term>Snow remobilization</term>
<term>Snow surface</term>
<term>Solid line</term>
<term>Southern annular mode</term>
<term>Southern hemisphere</term>
<term>Southern ocean</term>
<term>Spatial plot</term>
<term>Spatial variability</term>
<term>Stake measurements</term>
<term>Stratigraphic methods</term>
<term>Strong pressure gradient</term>
<term>Strong surface wind events</term>
<term>Strong wind events</term>
<term>Subantarctic stations</term>
<term>Surface pressure</term>
<term>Surface snow</term>
<term>Surface topography</term>
<term>Surface wind</term>
<term>Surface wind vectors</term>
<term>Synoptic</term>
<term>Synoptic pattern</term>
<term>Tasmania</term>
<term>Temporal accumulation pattern</term>
<term>Temporal variability</term>
<term>Terre adelie</term>
<term>Thin line</term>
<term>Time series</term>
<term>Time series plot</term>
<term>Topographic ridge</term>
<term>Tropospheric ridging</term>
<term>Trough</term>
<term>Upper level ridging</term>
<term>Variability</term>
<term>Wilkes</term>
<term>Wilkes land</term>
<term>Wilkes land coast</term>
<term>Wilkes land region</term>
<term>Winter</term>
<term>Year period</term>
<term>Zonal</term>
<term>Zonal wind</term>
<term>Zonal wind data</term>
<term>annual variations</term>
<term>atmospheric circulation</term>
<term>drill cores</term>
<term>firn</term>
<term>fluctuations</term>
<term>ice sheets</term>
<term>sea level</term>
<term>snow</term>
<term>trajectory</term>
<term>troposphere</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Accumulation neige</term>
<term>Antarctique</term>
<term>Australie</term>
<term>Carotte</term>
<term>Circulation atmosphérique</term>
<term>Cyclolyse</term>
<term>Fluctuation</term>
<term>Gradient pression</term>
<term>Hauteur géopotentielle</term>
<term>Hiver</term>
<term>Inlandsis</term>
<term>Intensification</term>
<term>Ionosphère région E</term>
<term>Masse air</term>
<term>Mode annulaire</term>
<term>Neige</term>
<term>Niveau mer</term>
<term>Nouvelle Zélande</term>
<term>Névé</term>
<term>Onde longue</term>
<term>Série temporelle</term>
<term>Taux accumulation</term>
<term>Trajectoire</term>
<term>Troposphère</term>
<term>Variation annuelle</term>
<term>Variation interannuelle</term>
<term>Vent surface</term>
<term>Vent zonal</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en"><term>Accumulation</term>
<term>Accumulation rate</term>
<term>Accumulation rates</term>
<term>Accumulation time series</term>
<term>Anare</term>
<term>Anomaly</term>
<term>Anomaly plots</term>
<term>Antarctic</term>
<term>Antarctic precipitation</term>
<term>Antarctic snow</term>
<term>Antarctica</term>
<term>Atmospheric circulation</term>
<term>Atmospheric dynamics</term>
<term>Atmospheric ridging</term>
<term>Austral</term>
<term>Austral winter</term>
<term>Australian antarctic division</term>
<term>Brightness temperature</term>
<term>Bromwich</term>
<term>Circulation pattern</term>
<term>Circumpolar</term>
<term>Circumpolar structure</term>
<term>Circumpolar trough</term>
<term>Clim</term>
<term>Climatology period</term>
<term>Core locations</term>
<term>Correlation analysis</term>
<term>Correlation pattern</term>
<term>Correlation values</term>
<term>Cyclolysis</term>
<term>Cyclone</term>
<term>Cyclone trajectories</term>
<term>Cyclonic activity</term>
<term>Decadal fluctuations</term>
<term>Density variations</term>
<term>East antarctic</term>
<term>East antarctic plateau</term>
<term>East antarctica</term>
<term>Eastern wilkes land</term>
<term>Elevation range</term>
<term>European space satellite</term>
<term>Firn</term>
<term>Firn core</term>
<term>Firn cores</term>
<term>Firn densification</term>
<term>Fluctuation</term>
<term>Fresh snow</term>
<term>Geophys</term>
<term>Geopotential</term>
<term>Geopotential height</term>
<term>Geopotential height data</term>
<term>Glaciol</term>
<term>Goodwin</term>
<term>Grain size</term>
<term>Gross beta radioactivity</term>
<term>High index phase</term>
<term>High pressure</term>
<term>High ratio</term>
<term>High surface pressure</term>
<term>Hydrogen peroxide</term>
<term>Incursion</term>
<term>Interannual</term>
<term>Interannual variability</term>
<term>Interannual variations</term>
<term>Interdecadal</term>
<term>Isotope</term>
<term>Katabatic</term>
<term>Katabatic winds</term>
<term>Large interdecadal variability</term>
<term>Late summer</term>
<term>Legrand</term>
<term>Level pressure</term>
<term>Life sciences</term>
<term>Longitude</term>
<term>Longitude band</term>
<term>Lower accumulation rates</term>
<term>Macquarie island</term>
<term>Mass incursions</term>
<term>Mayewski</term>
<term>Mslp</term>
<term>Mslp difference</term>
<term>Mslp index</term>
<term>Mulvaney</term>
<term>Nitrate</term>
<term>Nitrate concentration</term>
<term>Other wilkes land sites</term>
<term>Overall trend</term>
<term>Photochemical reactions</term>
<term>Physical temperature</term>
<term>Polar snow</term>
<term>Polar vortex</term>
<term>Poleward shift</term>
<term>Polyethylene bags</term>
<term>Pook</term>
<term>Postdepositional</term>
<term>Postdepositional processes</term>
<term>Precipitable water</term>
<term>Precipitation</term>
<term>Pressure field</term>
<term>Pressure gradient</term>
<term>Proxy climate data</term>
<term>Reanalysis project</term>
<term>Redistribution</term>
<term>Research centre</term>
<term>Ridging</term>
<term>Saint martin france</term>
<term>Scott base</term>
<term>Sheet slope</term>
<term>Sheet topography</term>
<term>Significance level</term>
<term>Significant differences</term>
<term>Snow accumulation</term>
<term>Snow accumulation rate</term>
<term>Snow accumulation rates</term>
<term>Snow accumulation time series</term>
<term>Snow accumulation variability</term>
<term>Snow accumulation variability figure</term>
<term>Snow chemistry data</term>
<term>Snow redistribution</term>
<term>Snow remobilization</term>
<term>Snow surface</term>
<term>Solid line</term>
<term>Southern annular mode</term>
<term>Southern hemisphere</term>
<term>Southern ocean</term>
<term>Spatial plot</term>
<term>Spatial variability</term>
<term>Stake measurements</term>
<term>Stratigraphic methods</term>
<term>Strong pressure gradient</term>
<term>Strong surface wind events</term>
<term>Strong wind events</term>
<term>Subantarctic stations</term>
<term>Surface pressure</term>
<term>Surface snow</term>
<term>Surface topography</term>
<term>Surface wind vectors</term>
<term>Synoptic</term>
<term>Synoptic pattern</term>
<term>Tasmania</term>
<term>Temporal accumulation pattern</term>
<term>Temporal variability</term>
<term>Terre adelie</term>
<term>Thin line</term>
<term>Time series</term>
<term>Time series plot</term>
<term>Topographic ridge</term>
<term>Tropospheric ridging</term>
<term>Trough</term>
<term>Upper level ridging</term>
<term>Variability</term>
<term>Wilkes</term>
<term>Wilkes land</term>
<term>Wilkes land coast</term>
<term>Wilkes land region</term>
<term>Year period</term>
<term>Zonal</term>
<term>Zonal wind data</term>
</keywords>
<keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Australie</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Antarctique</term>
<term>Cyclone</term>
<term>Sciences de la vie</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract">Wilkes Land annual snow accumulation variability is explored together with ice core chemistry data as proxies for circumpolar atmospheric circulation in the 110°E–135°E sector of the circumpolar trough. Four accumulation time series spanning 1930–1985 show a pattern of accumulation related to maritime air mass incursions over the East Antarctic ice sheet slope, which is regionally consistent on interannual and interdecadal timescales. The temporal accumulation pattern in Wilkes Land shows decadal fluctuations of ±10%. Both these fluctuations and the overall trend of increasing accumulation since the middle 1960s are consistent with a poleward shift and intensification of the circumpolar trough. This is consistent with a shift toward the high index state of the southern annular mode. Interannual variability of snow accumulation rate throughout Wilkes Land was found to be dependent upon shifts in the preferred tracks of cyclones along or across the coast and in the location of cyclolysis regions. Significant differences in this temporal accumulation pattern over Wilkes Land can occur as a result of the time‐varying location of atmospheric ridging and the circumpolar long‐wave structure south of New Zealand and Australia. Snow accumulation at an additional site (GD09) displays a well‐defined interdecadal pattern, and the mean annual nitrate (NO3−) concentration of snow is correlated to the winter sea level pressure gradient between East Antarctica and the sub‐Antarctic and the upper geopotential height and zonal wind data over East Antarctica. Strong, surface wind drainage during tropospheric ridging in Wilkes Land produces anomalous snow accumulation and annual mean NO3− concentration in firn at GD09.</div>
</front>
</TEI>
<affiliations><list><country><li>Australie</li>
<li>France</li>
</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Rhône-Alpes</li>
</region>
<settlement><li>Grenoble</li>
<li>Saint-Martin-d'Hères</li>
</settlement>
</list>
<tree><country name="Australie"><noRegion><name sortKey="Goodwin, I" sort="Goodwin, I" uniqKey="Goodwin I" first="I." last="Goodwin">I. Goodwin</name>
</noRegion>
<name sortKey="Goodwin, I" sort="Goodwin, I" uniqKey="Goodwin I" first="I." last="Goodwin">I. Goodwin</name>
<name sortKey="Goodwin, I" sort="Goodwin, I" uniqKey="Goodwin I" first="I." last="Goodwin">I. Goodwin</name>
<name sortKey="Pook, M" sort="Pook, M" uniqKey="Pook M" first="M." last="Pook">M. Pook</name>
<name sortKey="Young, N W" sort="Young, N W" uniqKey="Young N" first="N. W." last="Young">N. W. Young</name>
</country>
<country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="De Angelis, M" sort="De Angelis, M" uniqKey="De Angelis M" first="M." last="De Angelis">M. De Angelis</name>
</region>
</country>
</tree>
</affiliations>
</record>
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