Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain
The dynamics of evapotranspiration (ET), such as the partitioning to evaporation and transpiration, of polygonal ground on the Arctic Coastal Plain are not well understood. We assessed ET dynamics, including evaporation and transpiration partitioning, created by microtopographic features associated...
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ftcdlib:oai:escholarship.org:ark:/13030/qt4mm5c6b2 2023-06-11T04:07:16+02:00 Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain Young-Robertson, Jessica M Raz-Yaseef, Naama Cohen, Lily R Newman, Brent Rahn, Thom Sloan, Victoria Wilson, Cathy Wullschleger, Stan D e1435931 2018-01-01 application/pdf https://escholarship.org/uc/item/4mm5c6b2 unknown eScholarship, University of California qt4mm5c6b2 https://escholarship.org/uc/item/4mm5c6b2 public Arctic Antarctic and Alpine Research, vol 50, iss 1 Polygonal ground permafrost ice wedge plant functional type evapotranspiration partitioning Physical Geography and Environmental Geoscience Ecology article 2018 ftcdlib 2023-05-29T17:59:16Z The dynamics of evapotranspiration (ET), such as the partitioning to evaporation and transpiration, of polygonal ground on the Arctic Coastal Plain are not well understood. We assessed ET dynamics, including evaporation and transpiration partitioning, created by microtopographic features associated with high- and low-centered polygons. Chamber ET and leaf-level transpiration measurements were conducted in one-week field campaigns in two growing seasons with contrasting weather conditions. We found that ET was greater in the drier and warmer sampling period (2013) compared to the colder and wetter one (2014). Evaporation dominated ET, particularly in the wetter and colder sampling period (>90% in 2014 vs. 80% in 2013). In the 2013 sampling period, wetter and warmer conditions increased ET and the contribution of transpiration to ET. If the soils warm with degrading permafrost, ET and the fraction contributed by transpiration may increase to a certain threshold, when moisture must increase with rising temperatures to further increase these fluxes. While the fraction of transpiration may rise with warmer soils, it is unlikely that transpiration will completely dominate ET. This work highlights the complexities of understanding ET in this dynamic environment and the importance of understanding differences across polygonal ground. Article in Journal/Newspaper Antarctic and Alpine Research Arctic Arctic Ice permafrost wedge* University of California: eScholarship Arctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Polygonal ground permafrost ice wedge plant functional type evapotranspiration partitioning Physical Geography and Environmental Geoscience Ecology |
spellingShingle |
Polygonal ground permafrost ice wedge plant functional type evapotranspiration partitioning Physical Geography and Environmental Geoscience Ecology Young-Robertson, Jessica M Raz-Yaseef, Naama Cohen, Lily R Newman, Brent Rahn, Thom Sloan, Victoria Wilson, Cathy Wullschleger, Stan D Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain |
topic_facet |
Polygonal ground permafrost ice wedge plant functional type evapotranspiration partitioning Physical Geography and Environmental Geoscience Ecology |
description |
The dynamics of evapotranspiration (ET), such as the partitioning to evaporation and transpiration, of polygonal ground on the Arctic Coastal Plain are not well understood. We assessed ET dynamics, including evaporation and transpiration partitioning, created by microtopographic features associated with high- and low-centered polygons. Chamber ET and leaf-level transpiration measurements were conducted in one-week field campaigns in two growing seasons with contrasting weather conditions. We found that ET was greater in the drier and warmer sampling period (2013) compared to the colder and wetter one (2014). Evaporation dominated ET, particularly in the wetter and colder sampling period (>90% in 2014 vs. 80% in 2013). In the 2013 sampling period, wetter and warmer conditions increased ET and the contribution of transpiration to ET. If the soils warm with degrading permafrost, ET and the fraction contributed by transpiration may increase to a certain threshold, when moisture must increase with rising temperatures to further increase these fluxes. While the fraction of transpiration may rise with warmer soils, it is unlikely that transpiration will completely dominate ET. This work highlights the complexities of understanding ET in this dynamic environment and the importance of understanding differences across polygonal ground. |
format |
Article in Journal/Newspaper |
author |
Young-Robertson, Jessica M Raz-Yaseef, Naama Cohen, Lily R Newman, Brent Rahn, Thom Sloan, Victoria Wilson, Cathy Wullschleger, Stan D |
author_facet |
Young-Robertson, Jessica M Raz-Yaseef, Naama Cohen, Lily R Newman, Brent Rahn, Thom Sloan, Victoria Wilson, Cathy Wullschleger, Stan D |
author_sort |
Young-Robertson, Jessica M |
title |
Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain |
title_short |
Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain |
title_full |
Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain |
title_fullStr |
Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain |
title_full_unstemmed |
Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain |
title_sort |
evaporation dominates evapotranspiration on alaska’s arctic coastal plain |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/4mm5c6b2 |
op_coverage |
e1435931 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Antarctic and Alpine Research Arctic Arctic Ice permafrost wedge* |
genre_facet |
Antarctic and Alpine Research Arctic Arctic Ice permafrost wedge* |
op_source |
Arctic Antarctic and Alpine Research, vol 50, iss 1 |
op_relation |
qt4mm5c6b2 https://escholarship.org/uc/item/4mm5c6b2 |
op_rights |
public |
_version_ |
1768380260625154048 |