Winter positions of Arctic front during periods of cooling and warming
Winter positions of the Arctic front (AF) during the known periods of the climate cooling (1949–1980) and warming (1981–2012) were analyzed within the sector 10° W – 60° E. The AF positios were determined by the following indicators: 1) a surface pressure; 2) horizontal wind divergence; 3) geostroph...
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ftdoajarticles:oai:doaj.org/article:ac3cde964b5a43e09b161dac941bcafc 2023-05-15T15:03:37+02:00 Winter positions of Arctic front during periods of cooling and warming A. Yu. Mikhailov A. N. Zolotokrylin T. B. Titkova 2016-12-01T00:00:00Z https://doi.org/10.15356/2076-6734-2016-4-493-501 https://doaj.org/article/ac3cde964b5a43e09b161dac941bcafc RU rus Nauka https://ice-snow.igras.ru/jour/article/view/337 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2016-4-493-501 https://doaj.org/article/ac3cde964b5a43e09b161dac941bcafc Лëд и снег, Vol 56, Iss 4, Pp 493-501 (2016) арктический фронт воздушные массы дивергенция ветра концентрация морского льда приземное давление температура воздуха температура поверхности океана Science Q article 2016 ftdoajarticles https://doi.org/10.15356/2076-6734-2016-4-493-501 2023-03-19T01:40:11Z Winter positions of the Arctic front (AF) during the known periods of the climate cooling (1949–1980) and warming (1981–2012) were analyzed within the sector 10° W – 60° E. The AF positios were determined by the following indicators: 1) a surface pressure; 2) horizontal wind divergence; 3) geostrophic vortex; 4) geostrophic heat advection. The main extrema of these four dynamic characteristics coincide and fall on the latitude 72.5° N. This corresponds to the average position of the AF for a given resolution and confirms correctness of our choice of these characteristics as the AF indicators. Relative differences between mean profiles of all values of the above warm and cold periods were calculated using method of normalization of each value for the corresponding latitude by the standard deviation for the entire period (1949–2012). To study variability of the AF position we used mean yearly winter profiles of the variables under investigation together with the statistical analysis of positions of the extrema within the latitude degrees. For pressure and geostrophic advection positions of the absolute minima were determined while for geostrophic vortex and divergence – positions of the absolute maxima. The data show that according to different criteria the AF average positions for the period 1949–2012 lie within the zone 72.4–73.4 N. The interannual variability of the AF positions lies within the 1–2 degrees of latitude and corresponds to the range of the air temperature variability above the zone of maximal changes in the sea ice area. According to the standard deviation values of the divergence and the geostrophic vortex are the most stable in region of the AF passage. Comparison of differences of the studied characteristics between the warm and cold periods shows that the changes in the AF positions are not statistically significant (P(t) < 91% t‑criterion) unlike the changes in positions of isolines which characterize the warming (P(t) = 100%). Thus, despite significant changes in properties of the surface ... Article in Journal/Newspaper Arctic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Ice and Snow 56 4 493 501 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
арктический фронт воздушные массы дивергенция ветра концентрация морского льда приземное давление температура воздуха температура поверхности океана Science Q |
spellingShingle |
арктический фронт воздушные массы дивергенция ветра концентрация морского льда приземное давление температура воздуха температура поверхности океана Science Q A. Yu. Mikhailov A. N. Zolotokrylin T. B. Titkova Winter positions of Arctic front during periods of cooling and warming |
topic_facet |
арктический фронт воздушные массы дивергенция ветра концентрация морского льда приземное давление температура воздуха температура поверхности океана Science Q |
description |
Winter positions of the Arctic front (AF) during the known periods of the climate cooling (1949–1980) and warming (1981–2012) were analyzed within the sector 10° W – 60° E. The AF positios were determined by the following indicators: 1) a surface pressure; 2) horizontal wind divergence; 3) geostrophic vortex; 4) geostrophic heat advection. The main extrema of these four dynamic characteristics coincide and fall on the latitude 72.5° N. This corresponds to the average position of the AF for a given resolution and confirms correctness of our choice of these characteristics as the AF indicators. Relative differences between mean profiles of all values of the above warm and cold periods were calculated using method of normalization of each value for the corresponding latitude by the standard deviation for the entire period (1949–2012). To study variability of the AF position we used mean yearly winter profiles of the variables under investigation together with the statistical analysis of positions of the extrema within the latitude degrees. For pressure and geostrophic advection positions of the absolute minima were determined while for geostrophic vortex and divergence – positions of the absolute maxima. The data show that according to different criteria the AF average positions for the period 1949–2012 lie within the zone 72.4–73.4 N. The interannual variability of the AF positions lies within the 1–2 degrees of latitude and corresponds to the range of the air temperature variability above the zone of maximal changes in the sea ice area. According to the standard deviation values of the divergence and the geostrophic vortex are the most stable in region of the AF passage. Comparison of differences of the studied characteristics between the warm and cold periods shows that the changes in the AF positions are not statistically significant (P(t) < 91% t‑criterion) unlike the changes in positions of isolines which characterize the warming (P(t) = 100%). Thus, despite significant changes in properties of the surface ... |
format |
Article in Journal/Newspaper |
author |
A. Yu. Mikhailov A. N. Zolotokrylin T. B. Titkova |
author_facet |
A. Yu. Mikhailov A. N. Zolotokrylin T. B. Titkova |
author_sort |
A. Yu. Mikhailov |
title |
Winter positions of Arctic front during periods of cooling and warming |
title_short |
Winter positions of Arctic front during periods of cooling and warming |
title_full |
Winter positions of Arctic front during periods of cooling and warming |
title_fullStr |
Winter positions of Arctic front during periods of cooling and warming |
title_full_unstemmed |
Winter positions of Arctic front during periods of cooling and warming |
title_sort |
winter positions of arctic front during periods of cooling and warming |
publisher |
Nauka |
publishDate |
2016 |
url |
https://doi.org/10.15356/2076-6734-2016-4-493-501 https://doaj.org/article/ac3cde964b5a43e09b161dac941bcafc |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Лëд и снег, Vol 56, Iss 4, Pp 493-501 (2016) |
op_relation |
https://ice-snow.igras.ru/jour/article/view/337 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2016-4-493-501 https://doaj.org/article/ac3cde964b5a43e09b161dac941bcafc |
op_doi |
https://doi.org/10.15356/2076-6734-2016-4-493-501 |
container_title |
Ice and Snow |
container_volume |
56 |
container_issue |
4 |
container_start_page |
493 |
op_container_end_page |
501 |
_version_ |
1766335475603210240 |