High resolution stable water isotope composition (δ¹⁸O and dD) of two firn cores at the northern Antarctic Peninsula
Fuente:
PANGAEA
Enregistré dans:
| Auteurs principaux: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2017
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1867167675081293824 |
|---|---|
| author | Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike |
| author_facet | Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Antarctic Peninsula is one of the most challenging regions of Antarctica from a climatological perspective, owing to the recent atmospheric and oceanic warming. The steep topography and a lack of long-term and in situ meteorological observations complicate extrapolation of existing climate models to the sub-regional scale. Here, we present new evidence from the northern Antarctic Peninsula to demonstrate how stable water isotopes of firn cores and recent precipitation samples can reveal climatic processes related to nearby oceanic and atmospheric conditions. A noticeable effect of the sea ice cover on local temperatures and atmospheric modes, in particular the Southern Annular Mode (SAM), is demonstrated. In years with large sea ice extension in winter (negative SAM anomaly), an inversion layer in the lower troposphere develops at the coastal zone. Therefore, an isotope-temperature relationship valid for all seasons cannot be concluded. The delta-T relationship rather depends on seasonal variability of oceanic conditions. Transitional seasons (autumn and spring) are both stable seasons with an isotope-temperature gradient of +0.69 per mil/°C. The firn stable isotope composition reveals that the near-surface temperature at the Antarctic Peninsula shows a decreasing trend (-0.33 °C/y) between 2008 and 2014. Moreover, the deuterium excess (d excess) has been demonstrated to be a reliable indicator of seasonal oceanic conditions, and therefore suitable to improve a firn age model based on seasonal d excess variability. The annual accumulation rate in this region is highly variable, ranging between 1060 kg/m**2/y and 2470 kg/m**2/y from 2008 to 2014. The combination of isotopic and meteorological data is key for reconstructing recent climatic conditions with a high temporal resolution in polar regions where no direct observation exists. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_871083 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | High resolution stable water isotope composition (δ¹⁸O and dD) of two firn cores at the northern Antarctic Peninsula Fernandoy, Francisco Tetzner, Dieter Meyer, Hanno Gacitúa, Guisella Hoffmann, Kirstin Falk, Ulrike AWI_Envi; Polar Terrestrial Environmental Systems @ AWI The Antarctic Peninsula is one of the most challenging regions of Antarctica from a climatological perspective, owing to the recent atmospheric and oceanic warming. The steep topography and a lack of long-term and in situ meteorological observations complicate extrapolation of existing climate models to the sub-regional scale. Here, we present new evidence from the northern Antarctic Peninsula to demonstrate how stable water isotopes of firn cores and recent precipitation samples can reveal climatic processes related to nearby oceanic and atmospheric conditions. A noticeable effect of the sea ice cover on local temperatures and atmospheric modes, in particular the Southern Annular Mode (SAM), is demonstrated. In years with large sea ice extension in winter (negative SAM anomaly), an inversion layer in the lower troposphere develops at the coastal zone. Therefore, an isotope-temperature relationship valid for all seasons cannot be concluded. The delta-T relationship rather depends on seasonal variability of oceanic conditions. Transitional seasons (autumn and spring) are both stable seasons with an isotope-temperature gradient of +0.69 per mil/°C. The firn stable isotope composition reveals that the near-surface temperature at the Antarctic Peninsula shows a decreasing trend (-0.33 °C/y) between 2008 and 2014. Moreover, the deuterium excess (d excess) has been demonstrated to be a reliable indicator of seasonal oceanic conditions, and therefore suitable to improve a firn age model based on seasonal d excess variability. The annual accumulation rate in this region is highly variable, ranging between 1060 kg/m**2/y and 2470 kg/m**2/y from 2008 to 2014. The combination of isotopic and meteorological data is key for reconstructing recent climatic conditions with a high temporal resolution in polar regions where no direct observation exists. |
| title | High resolution stable water isotope composition (δ¹⁸O and dD) of two firn cores at the northern Antarctic Peninsula |
| topic | AWI_Envi; Polar Terrestrial Environmental Systems @ AWI |
| url | https://doi.org/10.1594/PANGAEA.871083 |