Impacts of recent warming and the 2015/16 El Niño on tropical Peruvian ice fields

Thompson, L.G.; Davis, M.E.; Mosley-Thompson, E.; Beaudon, E.; Porter, S.E.; Kutuzov, S.; Lin, P.N.; Mikhalenko, V.N.; Mountain, K.R.

Авторы: Thompson L.G., Davis M.E., Mosley-Thompson E., Beaudon E., Porter S.E., Kutuzov S., Lin P.N., Mikhalenko V.N., Mountain K.R.
Журнал: Journal of Geophysical Research
Том: 122
Номер: 23
Год издания: 2017
Издательство: William Byrd Press for John Hopkins Press
Местоположение издательства: United States
Первая страница: 12688
Последняя страница: 12701
DOI: 10.1002/2017jd026592
Аннотация: Data collected between 1974 and 2016 from snow pits and core samples from two Peruvian ice fields demonstrate the effect of the recent warming over the tropical Andes, augmented by El Niño, on the preservation of the climate record. As the 0oC isotherm is approaching the summit of the Quelccaya ice cap in the Andes of southern Peru (5670 masl), the distinctive seasonal δ18O oscillations in the fresh snow deposited within each thermal year are attenuated at depth due to melting and percolation through the firn. This has become increasingly pronounced over 43 years. In the Andes of northern Peru, the ice field on the col of Nevado Huascarán (6050 masl) has retained its seasonal δ18O variations at depth due to its higher elevation. During the 2015/16 El Niño, snow on Quelccaya and Huascarán was isotopically (δ18O) enriched and the net sum of accumulation over the previous year (NSA) was below the mean for non-El Niño years, particularly on Quelccaya (up to 64% below the mean) which was more pronounced than the NSA decrease during the comparable 1982/83 El Niño. Interannual large-scale oceanic and middle to upper level atmospheric temperatures influence δ18O in precipitation on both ice fields, although the influences are variably affected by strong El Niño-Southern Oscillation events, especially on Quelccaya. The rate of ice wastage along Quelccaya's margin was dramatically higher during 2015/16 compared with that of the previous 15 years, suggesting that warming from future El Niños may accelerate mass loss on Peruvian glaciers.
Добавил в систему: Кутузов Станислав Сергеевич

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Impacts of recent warming and the 2015/16 El Niño on tropical Peruvian ice fieldsстатья