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Эмиссия и диффузия метана в снежном покрове болот

Эмиссия и диффузия метана в снежном покрове болот

Abstract

The emission methane fluxes from the snow cover surface in an oligotrophic West Siberian bog and the profile distribution patterns of this gas in the snow stratum are studied. Physically reasonable mathematical models of the process of methane distribution in the snow cover combining the source on the surface of the peaty soil and the mechanism of diffusion transport of escaping gas from the soil into the atmosphere are developed. Stationary model variants are used to calculate the emission methane fluxes by the data on the profile gas distribution (gradient method of snow survey). The calculated data often exceed the fluxes measured by chamber method 2-3 times or more, varying in the range of 0.01-0.2 mgС sq m h. The proposed method of snow survey enables to successfully evaluate methane fluxes from a bog into the atmosphere during cold season smoothing their inherent great variation.

Исследуются эмиссионные потоки метана с поверхности снежного покрова олиготрофного западносибирского болота и закономерности профильного распределения этого газа в толще снега. Разработаны физически обоснованные математические модели процесса распределения метана в снеговом покрове, сочетающие источник на поверхности торфяной почвы и механизм диффузионного транспорта, выделяющегося газа в атмосферу. Стационарные варианты моделей используются для расчета эмиссионных потоков метана по данным о профильном распределении газа (градиентный метод снеговой съемки). Расчетные данные нередко превышают измеренные камерным методом потоки в 2-10 раз и более, варьируя в диапазоне 0,01-0,3 мгС/м 2/ч. Предложенный метод снеговой съемки позволяет успешно оценивать потоки болотного газа в атмосферу в холодное время года, сглаживая присущее им большое варьирование.

Keywords

МЕТАН В БОЛОТНЫХ ЭКОСИСТЕМАХ, ЗИМНИЕ НАБЛЮДЕНИЯ, ПРОФИЛЬНОЕ РАСПРЕДЕЛЕНИЕ В СНЕГУ, ЭМИССИЯ, ДИФФУЗИОННЫЙ ТРАНСПОРТ, МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold