Depositional and summer snow melting features in 2007–2011 on the upstream side of Potanin Glacier, Mongolian Altai, reconstructed by pollen and oxygen isotope analysis

Nakazawa, Fumio; Konya, Keiko; Kadota, Tsutomu; Ohata, Tetsuo

doi:10.1007/s12665-015-4436-1

Cited by 11 publications

(19 citation statements)

References 21 publications

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“…Recently the glaciers of the region were included in the GLIMS (Global Land Ice Measurements from Space) database and the Randolph Glacier Inventory [34,41,42]. The materials of the field observations were obtained for Turgen [33], Tavan Bogd, and Tsambagarav [37,43,44]. The first overview of the present glaciations of the arid Altai, including both the Russian and the Mongolian territory were given in our previous article [21].…”

Section: Introductionmentioning

confidence: 99%

Present Glaciers and Their Dynamics in the Arid Parts of the Altai Mountains

et al. 2017

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This research is based on multiyear in-situ observations, analysis of satellite and aerial imagery, meteorological data, and mass balance index calculations. Presently, 659 glaciers cover a total area of 322.1 km 2 . We identified four favorable, two neutral, and five unfavorable longer intervals of glacier development since 1940. A decelerating of glacial retreat took place in the 1960s and in the late 1980s/early 1990s. The strong decline in glacial mass between 1995 and 2009 resulted in a fast reduction of the glacial area (0.9% year −1 on the northern slope of Tavan Bogd, 1.5% year −1 at Mongun-Taiga), mostly due to the degradation of small glaciers; after 2009, the glacial loss slowed down. Large valley glaciers behaved asynchronously until recently, when their retreat accelerated rapidly reaching in some cases over 40 m·year −1 . Degradation of the accumulation zone and separation of the debris-covered parts of the glaciers are characteristic for the glacial retreat in the region of research. The time of reaction of the fronts of four valley glaciers of Mongun-Taiga and the northern slope of Tavan Bogd on climatic fluctuations is estimated between 11 and 20 years. Over the next decade, high rates of glacial degradation are expected.

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Section: Introductionmentioning

confidence: 99%

Present Glaciers and Their Dynamics in the Arid Parts of the Altai Mountains

et al. 2017

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“…Nakazawa et al (2015) show that pollen analysis is a powerful method for distinguishing annual layers in snow pits and ice cores from mountain glaciers where other conventional methods of annual layer identification are unreliable due to significant melting. To prove this, the study, conducted on the Potanin Glacier in the Mongolian Altai (Fig.…”

Section: Methods Studiesmentioning

confidence: 99%

Glacier fluctuation in northern and High Asia: historical and methods perspective

Fedotov

Margold

2015

Environ Earth Sci

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“…Several studies conducted on glaciers worldwide have proven that pollen (Nakazawa et al, 2004(Nakazawa et al, , 2005(Nakazawa et al, , 2011(Nakazawa et al, , 2015Santibañez et al, 2008;Uetake et al, 2006) and stable isotopes (Gabrielli et al, 2008;Haeberli et al, 1983;Thompson, 1980;Dansgaard, 1964;Vareschi, 1934) are valuable proxies to detect seasonality in ice cores. However, annual layer counting from oxygen and hydrogen isotopes ratios is a far more common chronological tool than the palynological approach, the potential of which remains largely unexplored.…”

Section: Festi Et Al: Linking Pollen Deposition and Snow Accumulamentioning

confidence: 99%

“…The main issue is that pollen analyses requires a minimum ice sample size of up to 1 L (e.g., Burogois, 2000), which is problematic to obtain because sample volume from ice cores is very limited, especially when working at high resolution. However, studies from the Altai (Nakazawa et al, 2015(Nakazawa et al, , 2011(Nakazawa et al, , 2005(Nakazawa et al, , 2004 and the European Alps (Festi et al, 2015;Bortenschlager, 1970a, b;Vareschi et al, 1934) suggest that this is still a limit for clean samples obtained from polar ice caps, whereas in low and midlatitude glaciers, the minimum sample size can be reduced to 10-30 mL (Festi et al, 2015;Nakazawa et al, 2011Nakazawa et al, , 2005 thanks to the proximity of the source vegetation and the consequent much greater pollen deposition. An additional limit is that pollen analyses are time consuming and work intensive because they imply manual identification and quantification of pollen grains.…”

Section: Festi Et Al: Linking Pollen Deposition and Snow Accumulamentioning

confidence: 99%

“…In order to overcome this latter issue Nakazawa et al (2011Nakazawa et al ( , 2005Nakazawa et al ( , 2004) adopted a simplified approach, focusing on three main taxa (Pinaceae, Betulaceae and Artemisia) that are representative of the three corresponding flowering seasons (spring, early summer, late summer). By doing so, they were able to detect seasonal changes in ice cores from the Altai (Nakazawa et al, 2015(Nakazawa et al, , 2012(Nakazawa et al, , 2006(Nakazawa et al, , 2005. Finally, there is little knowledge about the effects of percolating water on the palynological signal; only two studies directly addressed this issue, and they obtained contrasting results (Ewing et al, 2014;Nakazawa and Suzuki, 2008).…”

Section: Festi Et Al: Linking Pollen Deposition and Snow Accumulamentioning

confidence: 99%

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Linking pollen deposition and snow accumulation on the Alto dell'Ortles glacier (South Tyrol, Italy) for sub-seasonal dating of a firn temperate core

et al. 2017

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Abstract. Dating of ice cores from temperate non-polar glaciers is challenging and often problematic. However, a proper timescale is essential for a correct interpretation of the proxies measured in the cores. Here, we introduce a new method developed to obtain a sub-seasonal timescale relying on statistically measured similarities between pollen spectra obtained from core samples and daily airborne pollen monitoring samples collected in the same area. This approach was developed on a 10 m core retrieved from the temperatefirn portion of Alto dell'Ortles glacier (Eastern Italian Alps), for which a 5-year annual/seasonal timescale already exists. The aim was to considerably improve this timescale, reaching the highest possible temporal resolution and testing the efficiency and limits of pollen as a chronological tool. A test of the new timescale was performed by comparing our results to the output (date of layer formation) of the mass balance model EISModel, during the period encompassed by the timescale. The correspondence of the results supports the new sub-seasonal timescale based on pollen analysis. This comparison also allows us to draw important conclusions on the post-depositional effects of meltwater percolation on the pollen content of the firn core as well as on the climatic interpretation of the pollen signal.

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Depositional and summer snow melting features in 2007–2011 on the upstream side of Potanin Glacier, Mongolian Altai, reconstructed by pollen and oxygen isotope analysis

Cited by 11 publications

References 21 publications

Present Glaciers and Their Dynamics in the Arid Parts of the Altai Mountains

Present Glaciers and Their Dynamics in the Arid Parts of the Altai Mountains

Glacier fluctuation in northern and High Asia: historical and methods perspective

Linking pollen deposition and snow accumulation on the Alto dell'Ortles glacier (South Tyrol, Italy) for sub-seasonal dating of a firn temperate core

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