Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard)
The significant part of the Arctic soils is covered by vegetation all year round, to which a layer of snow is added in winter. Both layers have a similar structure, consisting of a skeleton (organic and ice, respectively) and air-saturated pores, and, thus, form a unified system with high heat-insul...
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Nauka
2021
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Online Access: | https://doi.org/10.31857/S2076673421020084 https://doaj.org/article/0184df4a3ad1449ab0ef32e2aa7ad623 |
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ftdoajarticles:oai:doaj.org/article:0184df4a3ad1449ab0ef32e2aa7ad623 2023-05-15T15:03:42+02:00 Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) P. V. Bogorodskiy V. Yu. Kustov V. V. Movchan K. A. Ermokhina 2021-05-01T00:00:00Z https://doi.org/10.31857/S2076673421020084 https://doaj.org/article/0184df4a3ad1449ab0ef32e2aa7ad623 RU rus Nauka https://ice-snow.igras.ru/jour/article/view/891 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.31857/S2076673421020084 https://doaj.org/article/0184df4a3ad1449ab0ef32e2aa7ad623 Лëд и снег, Vol 61, Iss 2, Pp 232-240 (2021) конвективная неустойчивость критические числа рэлея растительный и снежный покровы западный шпицберген Science Q article 2021 ftdoajarticles https://doi.org/10.31857/S2076673421020084 2023-03-19T01:40:11Z The significant part of the Arctic soils is covered by vegetation all year round, to which a layer of snow is added in winter. Both layers have a similar structure, consisting of a skeleton (organic and ice, respectively) and air-saturated pores, and, thus, form a unified system with high heat-insulating properties. But, with the temperature gradient within the layers, convection can arise, which significantly reduces the thermal resistance of the layers and affects the heat, mass and gas exchange of the atmospheric boundary layer with the ground. In this connection, the role of convective transport in the formation of the thermodynamic and biogeochemical regime of polar ecosystems becomes obvious. Note that the role of convection in the snow cover is discussed in literature, but similar studies for vegetation are absent. This is one of the reasons why the processes of heat and mass transfer in the moss-snow layer above the ground in high latitudes are reproduced in a very simplified way, even in the most advanced models of the Earth system. In this paper, we study the occurrence of instability in a system of two porous layers with heat-insulated boundaries for conditions that approximate the snow and vegetation cover of the Arctic tundra on the coast of the Gulf of Grenfjord (West Spitsbergen). The analytical solution of the Rayleigh-Darcy problem is obtained by means of expansion of the amplitudes of perturbations of vertical velocity and air temperature into series. The dependence of the convective instability threshold on the variations of the thermal physical properties of the vegetation and snow cover of the studied region, parameterized according to measurement data and literature sources, is estimated. It has been found that the stability threshold increases with growth of snow thickness and density. It was also shown that the non-Rayleigh instability becomes impossible when heated from above (meaning the long-wave mode), which occurs in a similar system of two layers of homogeneous immiscible liquids ... Article in Journal/Newspaper Arctic Svalbard Tundra Spitsbergen Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Ice and Snow 61 2 232 240 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
конвективная неустойчивость критические числа рэлея растительный и снежный покровы западный шпицберген Science Q |
spellingShingle |
конвективная неустойчивость критические числа рэлея растительный и снежный покровы западный шпицберген Science Q P. V. Bogorodskiy V. Yu. Kustov V. V. Movchan K. A. Ermokhina Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) |
topic_facet |
конвективная неустойчивость критические числа рэлея растительный и снежный покровы западный шпицберген Science Q |
description |
The significant part of the Arctic soils is covered by vegetation all year round, to which a layer of snow is added in winter. Both layers have a similar structure, consisting of a skeleton (organic and ice, respectively) and air-saturated pores, and, thus, form a unified system with high heat-insulating properties. But, with the temperature gradient within the layers, convection can arise, which significantly reduces the thermal resistance of the layers and affects the heat, mass and gas exchange of the atmospheric boundary layer with the ground. In this connection, the role of convective transport in the formation of the thermodynamic and biogeochemical regime of polar ecosystems becomes obvious. Note that the role of convection in the snow cover is discussed in literature, but similar studies for vegetation are absent. This is one of the reasons why the processes of heat and mass transfer in the moss-snow layer above the ground in high latitudes are reproduced in a very simplified way, even in the most advanced models of the Earth system. In this paper, we study the occurrence of instability in a system of two porous layers with heat-insulated boundaries for conditions that approximate the snow and vegetation cover of the Arctic tundra on the coast of the Gulf of Grenfjord (West Spitsbergen). The analytical solution of the Rayleigh-Darcy problem is obtained by means of expansion of the amplitudes of perturbations of vertical velocity and air temperature into series. The dependence of the convective instability threshold on the variations of the thermal physical properties of the vegetation and snow cover of the studied region, parameterized according to measurement data and literature sources, is estimated. It has been found that the stability threshold increases with growth of snow thickness and density. It was also shown that the non-Rayleigh instability becomes impossible when heated from above (meaning the long-wave mode), which occurs in a similar system of two layers of homogeneous immiscible liquids ... |
format |
Article in Journal/Newspaper |
author |
P. V. Bogorodskiy V. Yu. Kustov V. V. Movchan K. A. Ermokhina |
author_facet |
P. V. Bogorodskiy V. Yu. Kustov V. V. Movchan K. A. Ermokhina |
author_sort |
P. V. Bogorodskiy |
title |
Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) |
title_short |
Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) |
title_full |
Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) |
title_fullStr |
Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) |
title_full_unstemmed |
Generation of thermal convection in the moss-snow layer on the coast of the Gulf of Grenfjord (West Svalbard) |
title_sort |
generation of thermal convection in the moss-snow layer on the coast of the gulf of grenfjord (west svalbard) |
publisher |
Nauka |
publishDate |
2021 |
url |
https://doi.org/10.31857/S2076673421020084 https://doaj.org/article/0184df4a3ad1449ab0ef32e2aa7ad623 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Svalbard Tundra Spitsbergen |
genre_facet |
Arctic Svalbard Tundra Spitsbergen |
op_source |
Лëд и снег, Vol 61, Iss 2, Pp 232-240 (2021) |
op_relation |
https://ice-snow.igras.ru/jour/article/view/891 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.31857/S2076673421020084 https://doaj.org/article/0184df4a3ad1449ab0ef32e2aa7ad623 |
op_doi |
https://doi.org/10.31857/S2076673421020084 |
container_title |
Ice and Snow |
container_volume |
61 |
container_issue |
2 |
container_start_page |
232 |
op_container_end_page |
240 |
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1766335553318420480 |