Influence of Summer Sublimation on δD, δ18O, and δ17O in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores

Pang, Hongxi; Hou, Shugui; Landais, Amaëlle; Masson‐Delmotte, Valérie; Jouzel, Jean; Steen‐Larsen, Hans Christian; Risi, Camille; Zhang, Wangbin; Wu, Shuangye; Li, Yuansheng; An, Chunlei; Wang, Yetang; Prié, Frédéric; Minster, Bénédicte; Falourd, S.; Stenni, Barbara; Scarchilli, Claudio; Fujita, Koji; Grigioni, Paolo

doi:10.1029/2018jd030218

Cited by 26 publications

(27 citation statements)

References 120 publications

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“…Maxima of d-excess v in late autumn have also been observed in different locations, in particular around the North Atlantic sector (Bonne et al, 2014;Steen-Larsen et al, 2015). The very low relative humidity values above the ocean where evaporation takes place in this season could explain these high d-excess v values (Pfahl and Sodemann, 2014;Steen-Larsen et al, 2014). The other spike of d-excess v observed in April-May is not concomitant with low relative humidity.…”

Section: Temporal Variations Of the Water Isotopic Compositionmentioning

confidence: 82%

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia

et al. 2020

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Abstract. In the context of the Arctic amplification of climate change affecting the regional atmospheric hydrological cycle, it is crucial to characterize the present-day moisture sources of the Arctic. The isotopic composition is an important tool to enhance our understanding of the drivers of the hydrological cycle due to the different molecular characteristics of water stable isotopes during phase change. This study introduces 2 years of continuous in situ water vapour and precipitation isotopic observations conducted since July 2015 in the eastern Siberian Lena delta at the research station on Samoylov Island. The vapour isotopic signals are dominated by variations at seasonal and synoptic timescales. Diurnal variations of the vapour isotopic signals are masked by synoptic variations, indicating low variations of the amplitude of local sources at the diurnal scale in winter, summer and autumn. Low-amplitude diurnal variations in spring may indicate exchange of moisture between the atmosphere and the snow-covered surface. Moisture source diagnostics based on semi-Lagrangian backward trajectories reveal that different air mass origins have contrasting contributions to the moisture budget of the Lena delta region. At the seasonal scale, the distance from the net moisture sources to the arrival site strongly varies. During the coldest months, no contribution from local secondary evaporation is observed. Variations of the vapour isotopic composition during the cold season on the synoptic timescale are strongly related to moisture source regions and variations in atmospheric transport: warm and isotopically enriched moist air is linked to fast transport from the Atlantic sector, while dry and cold air with isotopically depleted moisture is generally associated with air masses moving slowly over northern Eurasia.

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Section: Temporal Variations Of the Water Isotopic Compositionmentioning

confidence: 82%

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia

et al. 2020

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“…Altogether, precipitation to vapour observations performed on the East Antarctic Plateau in summer (Casado et al, 2016;Ritter et al, 2016). This could indicate a strong isotopic depletion during long-range atmospheric transport from the moisture sources to the location of the observations, or recycling of moisture with sublimation over the surrounding snow-covered areas (Pang et al, 2019…”

Section: Ranges Of Variations Of Isotopic and Meteorological Datasetmentioning

confidence: 95%

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia

Bonne¹,

Meyer²,

Behrens³

et al. 2020

Preprint

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Abstract. In the context of the Arctic amplification of climate change affecting the regional atmospheric hydrological cycle, it is crucial to characterize the present-day&#8217;s moisture sources of the Arctic. The isotopic composition is an important tool to enhance our understanding of the drivers of the hydrological cycle, due to the different molecular characteristics of water stable isotopes during phase change. This study introduces two years of continuous in situ water vapour and precipitation isotopic observations conducted since July 2015 in the east-Siberian Lena delta, at the research station on the Samoylov Island. The vapour isotopic signals are dominated by variations at the seasonal and synoptic time scales. Diurnal variations of the vapour isotopic signals are masked by synoptic variations, indicating low variations of the amplitude of local sources at the diurnal scale in winter, summer and autumn. Low amplitude diurnal variations in spring may indicate exchange of moisture between the atmosphere and the snow-covered surface. Moisture sources diagnostics based on semi-Lagrangian backward trajectories reveal that different air mass origins have contrasted contributions to the moisture budget of the Lena delta region. At the seasonal scale, the distance from the net moisture sources to the arrival site strongly varies. During the coldest months, no contribution from local secondary evaporation is observed. Variations of the vapour isotopic composition during the cold season on synoptic time scale are strongly related to moisture source regions and variations in the atmospheric transport: warm and isotopically-enriched moist air is linked with fast transport from the Atlantic sector; while dry and cold air with isotopically-depleted moisture is generally associated to air masses moving slowly over northern Eurasia.

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“…Another process that is likely to contribute to the alignment of the water isotope records at the GI onsets is the local cycle of sublimation-condensation in summer on the Greenland and Antarctic ice sheets that is currently under investigation (Kopec et al, 2019;Pang et al, 2019). Sublimation affects the isotope concentration and the deuterium excess of snow through kinetic fractionation.…”

Section: Bipolar Phasing Of Abrupt Climate Changementioning

confidence: 99%

Bipolar volcanic synchronization of abrupt climate change in Greenland and Antarctic ice cores during the last glacial period

et al. 2020

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Abstract. The last glacial period is characterized by a number of millennial climate events that have been identified in both Greenland and Antarctic ice cores and that are abrupt in Greenland climate records. The mechanisms governing this climate variability remain a puzzle that requires a precise synchronization of ice cores from the two hemispheres to be resolved. Previously, Greenland and Antarctic ice cores have been synchronized primarily via their common records of gas concentrations or isotopes from the trapped air and via cosmogenic isotopes measured on the ice. In this work, we apply ice core volcanic proxies and annual layer counting to identify large volcanic eruptions that have left a signature in both Greenland and Antarctica. Generally, no tephra is associated with those eruptions in the ice cores, so the source of the eruptions cannot be identified. Instead, we identify and match sequences of volcanic eruptions with bipolar distribution of sulfate, i.e. unique patterns of volcanic events separated by the same number of years at the two poles. Using this approach, we pinpoint 82 large bipolar volcanic eruptions throughout the second half of the last glacial period (12–60 ka). This improved ice core synchronization is applied to determine the bipolar phasing of abrupt climate change events at decadal-scale precision. In response to Greenland abrupt climatic transitions, we find a response in the Antarctic water isotope signals (δ18O and deuterium excess) that is both more immediate and more abrupt than that found with previous gas-based interpolar synchronizations, providing additional support for our volcanic framework. On average, the Antarctic bipolar seesaw climate response lags the midpoint of Greenland abrupt δ18O transitions by 122±24 years. The time difference between Antarctic signals in deuterium excess and δ18O, which likewise informs the time needed to propagate the signal as described by the theory of the bipolar seesaw but is less sensitive to synchronization errors, suggests an Antarctic δ18O lag behind Greenland of 152±37 years. These estimates are shorter than the 200 years suggested by earlier gas-based synchronizations. As before, we find variations in the timing and duration between the response at different sites and for different events suggesting an interaction of oceanic and atmospheric teleconnection patterns as well as internal climate variability.

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Influence of Summer Sublimation on δD, δ¹⁸O, and δ¹⁷O in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores

Cited by 26 publications

References 120 publications

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia

Moisture origin as a driver of temporal variabilities of the water vapour isotopic composition in the Lena River Delta, Siberia

Bipolar volcanic synchronization of abrupt climate change in Greenland and Antarctic ice cores during the last glacial period

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