Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures

Tedesco, Marco; Abdalati, W.; Zwally, H. Jay

doi:10.1029/2007gl031199

Cited by 59 publications

(64 citation statements)

References 13 publications

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“…Nevertheless, large regions of the AP remain devoid of data because of the steep mountain slopes and the harsh climatic conditions, including extreme amounts of precipitation, especially on the western side (Genthon and Krinner 2001). To fill these gaps, remote sensing techniques can be used, such as microwave sensors to detect (brightness) temperatures (Tedesco et al 2007) or radar backscatter to identify melt episodes (Barrand et al 2013). Atmospheric reanalysis products (Bracegirdle and Marshall 2012) and global climate models (GCMs) provide gridded climate information, but with horizontal resolutions that range from 25 to 150 km, these do not accurately resolve the rough topography of the AP.…”

Section: Introductionmentioning

confidence: 99%

Temperature and Wind Climate of the Antarctic Peninsula as Simulated by a High-Resolution Regional Atmospheric Climate Model

et al. 2015

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTThe latest polar version of the Regional Atmospheric Climate Model (RACMO2.3) has been applied to the Antarctic Peninsula (AP). In this study, the authors present results of a climate run at 5.5 km for the period 1979-2013, in which RACMO2.3 is forced by ERA-Interim atmospheric and ocean surface fields, using an updated AP surface topography. The model results are evaluated with near-surface temperature and wind measurements from 12 manned and automatic weather stations and vertical profiles from balloon soundings made at three stations. The seasonal cycle of near-surface temperature and wind is simulated well, with most biases still related to the limited model resolution. High-resolution climate maps of temperature and wind showing that the AP climate exhibits large spatial variability are discussed. Over the steep and high mountains of the northern AP, large west-to-east climate gradients exist, while over the gentle southern AP mountains the near-surface climate is dominated by katabatic winds. Over the flat ice shelves, where katabatic wind forcing is weak, interannual variability in temperature is largest. Finally, decadal trends of temperature and wind are presented, and it is shown that recently there has been distinct warming over the northwestern AP and cooling over the rest of the AP, related to changes in sea ice cover.

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Section: Introductionmentioning

confidence: 99%

Temperature and Wind Climate of the Antarctic Peninsula as Simulated by a High-Resolution Regional Atmospheric Climate Model

et al. 2015

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“…et al, 1991;Turner et al, 2005;Bracegirdle et al, 2008). Up to 87 % of 244 marine glacier fronts from the whole Antarctic Peninsula are presently retreating (Cook et al, 2005) and the height line of permanent dry snow has clearly ascended over the last decades (Rau and Braun, 2002;Tedesco et al, 2007). The warming of both the atmosphere and the ocean has been producing an increase of humidity, leading to raised snow accumulation rates in the southern WAP as shown by Thomas et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Stable water isotopes of precipitation and firn cores from the northern Antarctic Peninsula region as a proxy for climate reconstruction

Fernandoy

Meyer

Tonelli³

2012

The Cryosphere

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Abstract. In order to investigate the climate variability in the northern Antarctic Peninsula region, this paper focuses on the relationship between stable isotope content of precipitation and firn, and main meteorological variables (air temperature, relative humidity, sea surface temperature, and sea ice extent). Between 2008 and 2010, we collected precipitation samples and retrieved firn cores from several key sites in this region. We conclude that the deuterium excess oscillation represents a robust indicator of the meteorological variability on a seasonal to sub-seasonal scale. Low absolute deuterium excess values and the synchronous variation of both deuterium excess and air temperature imply that the evaporation of moisture occurs in the adjacent Southern Ocean. The δ 18 O-air temperature relationship is complicated and significant only at a (multi)seasonal scale. Backward trajectory calculations show that air-parcels arriving at the region during precipitation events predominantly originate at the South Pacific Ocean and Bellingshausen Sea. These investigations will be used as a calibration for ongoing and future research in the area, suggesting that appropriate locations for future ice core research are located above 600 m a.s.l. We selected the Plateau Laclavere, Antarctic Peninsula as the most promising site for a deeper drilling campaign.

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“…This can lead to mass loss directly, through meltwater runoff, or indirectly, by contributing to ice-shelf break-up, subsequent glacier acceleration, and ultimately increasing ice discharge into the ocean. The first mechanism (meltwater runoff), prominent in Greenland, is still relatively limited in Antarctica (Tedesco et al 2007;Kuipers Munneke et al 2012) and is expected to remain largely so in the upcoming decades (Krinner et al 2007;Ligtenberg et al 2013). The second mechanism (ice-shelf weakening) is potentially far more significant given the buttressing effect of the large coastal ice shelves for the structurally unstable West Antarctic Ice Sheet (Joughin and Alley 2011).…”

Section: Introductionmentioning

confidence: 99%

New Reconstruction of Antarctic Near-Surface Temperatures: Multidecadal Trends and Reliability of Global Reanalyses*,+

2014

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Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures

Abstract: [1] Persistent melting (e.g., continuing for more than three days or for one consecutive day and night) is mapped in Antarctica (1987Antarctica ( -2006

Cited by 59 publications

References 13 publications

Temperature and Wind Climate of the Antarctic Peninsula as Simulated by a High-Resolution Regional Atmospheric Climate Model

Temperature and Wind Climate of the Antarctic Peninsula as Simulated by a High-Resolution Regional Atmospheric Climate Model

Stable water isotopes of precipitation and firn cores from the northern Antarctic Peninsula region as a proxy for climate reconstruction

New Reconstruction of Antarctic Near-Surface Temperatures: Multidecadal Trends and Reliability of Global Reanalyses*,+

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