The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds
This study not only examined the spatiotemporal variations of active-layer thickness (ALT) in permafrost regions during 1948–2006 over the terrestrial Arctic regions experiencing climate changes, but also identified the associated drivers based on observational data and a simulation conducted by a l...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2013
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-7-631-2013 https://doaj.org/article/c0d977008d4c463c9e16daf2598a0124 |
id |
ftdoajarticles:oai:doaj.org/article:c0d977008d4c463c9e16daf2598a0124 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:c0d977008d4c463c9e16daf2598a0124 2023-05-15T13:03:13+02:00 The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds H. Park J. Walsh A. N. Fedorov A. B. Sherstiukov Y. Iijima T. Ohata 2013-04-01T00:00:00Z https://doi.org/10.5194/tc-7-631-2013 https://doaj.org/article/c0d977008d4c463c9e16daf2598a0124 EN eng Copernicus Publications http://www.the-cryosphere.net/7/631/2013/tc-7-631-2013.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-7-631-2013 1994-0416 1994-0424 https://doaj.org/article/c0d977008d4c463c9e16daf2598a0124 The Cryosphere, Vol 7, Iss 2, Pp 631-645 (2013) Environmental sciences GE1-350 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/tc-7-631-2013 2022-12-31T03:45:02Z This study not only examined the spatiotemporal variations of active-layer thickness (ALT) in permafrost regions during 1948–2006 over the terrestrial Arctic regions experiencing climate changes, but also identified the associated drivers based on observational data and a simulation conducted by a land surface model (CHANGE). The focus on the ALT extends previous studies that have emphasized ground temperatures in permafrost regions. The Ob, Yenisey, Lena, Yukon, and Mackenzie watersheds are foci of the study. Time series of ALT in Eurasian watersheds showed generally increasing trends, while the increase in ALT in North American watersheds was not significant. However, ALT in the North American watersheds has been negatively anomalous since 1990 when the Arctic air temperature entered into a warming phase. The warming temperatures were not simply expressed to increases in ALT. Since 1990 when the warming increased, the forcing of the ALT by the higher annual thawing index (ATI) in the Mackenzie and Yukon basins has been offset by the combined effects of less insulation caused by thinner snow depth and drier soil during summer. In contrast, the increasing ATI together with thicker snow depth and higher summer soil moisture in the Lena contributed to the increase in ALT. The results imply that the soil thermal and moisture regimes formed in the pre-thaw season(s) provide memory that manifests itself during the summer. The different ALT anomalies between Eurasian and North American watersheds highlight increased importance of the variability of hydrological variables. Article in Journal/Newspaper Active layer thickness Arctic permafrost The Cryosphere Yukon Directory of Open Access Journals: DOAJ Articles Arctic Yukon Yenisey ENVELOPE(82.680,82.680,71.828,71.828) The Cryosphere 7 2 631 645 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 H. Park J. Walsh A. N. Fedorov A. B. Sherstiukov Y. Iijima T. Ohata The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
This study not only examined the spatiotemporal variations of active-layer thickness (ALT) in permafrost regions during 1948–2006 over the terrestrial Arctic regions experiencing climate changes, but also identified the associated drivers based on observational data and a simulation conducted by a land surface model (CHANGE). The focus on the ALT extends previous studies that have emphasized ground temperatures in permafrost regions. The Ob, Yenisey, Lena, Yukon, and Mackenzie watersheds are foci of the study. Time series of ALT in Eurasian watersheds showed generally increasing trends, while the increase in ALT in North American watersheds was not significant. However, ALT in the North American watersheds has been negatively anomalous since 1990 when the Arctic air temperature entered into a warming phase. The warming temperatures were not simply expressed to increases in ALT. Since 1990 when the warming increased, the forcing of the ALT by the higher annual thawing index (ATI) in the Mackenzie and Yukon basins has been offset by the combined effects of less insulation caused by thinner snow depth and drier soil during summer. In contrast, the increasing ATI together with thicker snow depth and higher summer soil moisture in the Lena contributed to the increase in ALT. The results imply that the soil thermal and moisture regimes formed in the pre-thaw season(s) provide memory that manifests itself during the summer. The different ALT anomalies between Eurasian and North American watersheds highlight increased importance of the variability of hydrological variables. |
format |
Article in Journal/Newspaper |
author |
H. Park J. Walsh A. N. Fedorov A. B. Sherstiukov Y. Iijima T. Ohata |
author_facet |
H. Park J. Walsh A. N. Fedorov A. B. Sherstiukov Y. Iijima T. Ohata |
author_sort |
H. Park |
title |
The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds |
title_short |
The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds |
title_full |
The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds |
title_fullStr |
The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds |
title_full_unstemmed |
The influence of climate and hydrological variables on opposite anomaly in active-layer thickness between Eurasian and North American watersheds |
title_sort |
influence of climate and hydrological variables on opposite anomaly in active-layer thickness between eurasian and north american watersheds |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-631-2013 https://doaj.org/article/c0d977008d4c463c9e16daf2598a0124 |
long_lat |
ENVELOPE(82.680,82.680,71.828,71.828) |
geographic |
Arctic Yukon Yenisey |
geographic_facet |
Arctic Yukon Yenisey |
genre |
Active layer thickness Arctic permafrost The Cryosphere Yukon |
genre_facet |
Active layer thickness Arctic permafrost The Cryosphere Yukon |
op_source |
The Cryosphere, Vol 7, Iss 2, Pp 631-645 (2013) |
op_relation |
http://www.the-cryosphere.net/7/631/2013/tc-7-631-2013.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-7-631-2013 1994-0416 1994-0424 https://doaj.org/article/c0d977008d4c463c9e16daf2598a0124 |
op_doi |
https://doi.org/10.5194/tc-7-631-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
2 |
container_start_page |
631 |
op_container_end_page |
645 |
_version_ |
1766331559980302336 |