scholarly journals Landscape matters: Predicting the biogeochemical effects of permafrost thaw on aquatic networks with a state factor approach

2020 ◽  
Vol 31 (3) ◽  
pp. 358-370 ◽  
Author(s):  
Suzanne E. Tank ◽  
Jorien E. Vonk ◽  
Michelle A. Walvoord ◽  
James W. McClelland ◽  
Isabelle Laurion ◽  
...  
Keyword(s):  
Permafrost Thaw ◽  
State Factor

scholarly journals A synthesis of three decades of hydrological research at Scotty Creek, NWT, Canada

2019 ◽  
Vol 23 (4) ◽  
pp. 2015-2039 ◽  
Author(s):  
William Quinton ◽  
Aaron Berg ◽  
Michael Braverman ◽  
Olivia Carpino ◽  
Laura Chasmer ◽  
...  
Keyword(s):  
Land Cover ◽  
Water Flux ◽  
Study Region ◽  
Physical Mechanisms ◽  
Permafrost Thaw ◽  
Discontinuous Permafrost ◽  
Modelling Studies ◽  
Hydrology And Water Resources ◽  
And Storage ◽  
Storage Processes

Abstract. Scotty Creek, Northwest Territories (NWT), Canada, has been the focus of hydrological research for nearly three decades. Over this period, field and modelling studies have generated new insights into the thermal and physical mechanisms governing the flux and storage of water in the wetland-dominated regions of discontinuous permafrost that characterises much of the Canadian and circumpolar subarctic. Research at Scotty Creek has coincided with a period of unprecedented climate warming, permafrost thaw, and resulting land cover transformations including the expansion of wetland areas and loss of forests. This paper (1) synthesises field and modelling studies at Scotty Creek, (2) highlights the key insights of these studies on the major water flux and storage processes operating within and between the major land cover types, and (3) provides insights into the rate and pattern of the permafrost-thaw-induced land cover change and how such changes will affect the hydrology and water resources of the study region.

A Longitudinal Study of the Factor VII Rise during Pregnancy

1998 ◽  
Vol 79 (02) ◽  
pp. 328-330 ◽  
Author(s):  
D. Wright ◽  
J. M. Thomson ◽  
A. Sidebotham ◽  
C. F. Hirst ◽  
P. Hirsch ◽  
...  
Keyword(s):  
Weight Gain ◽  
Longitudinal Study ◽  
Factor Viia ◽  
Factor Vii ◽  
Maternal Weight Gain ◽  
Maternal Weight ◽  
Foetal Growth ◽  
Indirect Measures ◽  
Activity State ◽  
State Factor

SummaryA longitudinal study of 21 pregnant women has been undertaken using a variety of factor VII assays, including factor VIIa, to investigate the increase of factor VIIc. All assays demonstrated significant rises (p <0.001), most marked for factor VIIa (82%) and factor VIIc rabbit (81%). Smaller rises were seen for factor VIIc bovine (50%) and VII antigen (40%). Three indirect measures of activity state, factor VIIc rabbit:antigen, bovine:antigen and bovine:rabbit, provided conflicting data. Factor VIIa:antigen showed a significant increase of 36% (p <0.001). Within individual pregnancies the change in factor VIIc rabbit and antigen correlated with maternal weight gain (p <0.05). Two activity state measures, bovine:rabbit and bovine:antigen, showed negative correlation with birthweight. The increases in both zymogen and in activity state appear to contribute to the factor VIIc rise. The extent of this rise appears to be influenced by maternal weight gain. Increased factor VII activation is associated with reduced foetal growth.

scholarly journals Population living on permafrost in the Arctic

2021 ◽  
Vol 43 (1) ◽  
pp. 22-38
Author(s):  
Justine Ramage ◽  
Leneisja Jungsberg ◽  
Shinan Wang ◽  
Sebastian Westermann ◽  
Hugues Lantuit ◽  
...  
Keyword(s):  
The Arctic ◽  
Permafrost Region ◽  
Permafrost Thaw ◽  
Arctic Regions ◽  
High Hazard

AbstractPermafrost thaw is a challenge in many Arctic regions, one that modifies ecosystems and affects infrastructure and livelihoods. To date, there have been no demographic studies of the population on permafrost. We present the first estimates of the number of inhabitants on permafrost in the Arctic Circumpolar Permafrost Region (ACPR) and project changes as a result of permafrost thaw. We combine current and projected populations at settlement level with permafrost extent. Key findings indicate that there are 1162 permafrost settlements in the ACPR, accommodating 5 million inhabitants, of whom 1 million live along a coast. Climate-driven permafrost projections suggest that by 2050, 42% of the permafrost settlements will become permafrost-free due to thawing. Among the settlements remaining on permafrost, 42% are in high hazard zones, where the consequences of permafrost thaw will be most severe. In total, 3.3 million people in the ACPR live currently in settlements where permafrost will degrade and ultimately disappear by 2050.

scholarly journals Assessing the Potential for Mobilization of Old Soil Carbon After Permafrost Thaw: A Synthesis of 14 C Measurements From the Northern Permafrost Region

2020 ◽  
Vol 34 (9) ◽  
Author(s):  
Cristian Estop‐Aragonés ◽  
David Olefeldt ◽  
Benjamin W. Abbott ◽  
Jeffrey P. Chanton ◽  
Claudia I. Czimczik ◽  
...  
Keyword(s):  
Soil Carbon ◽  
Permafrost Region ◽  
Permafrost Thaw

scholarly journals Poorly known microbial taxa dominate the microbiome of permafrost thaw ponds

2017 ◽  
Vol 11 (8) ◽  
pp. 1938-1941 ◽  
Author(s):  
Christian Wurzbacher ◽  
R Henrik Nilsson ◽  
Milla Rautio ◽  
Sari Peura
Keyword(s):  
Permafrost Thaw

Permafrost thaw with warming reduces microbial metabolic capacities in sub‐surface soils

2021 ◽  
Author(s):  
Linwei Wu ◽  
Felix Yang ◽  
Jiajie Feng ◽  
Xuanyu Tao ◽  
Qi Qi ◽  
...  
Keyword(s):  
Surface Soils ◽  
Permafrost Thaw

scholarly journals Permafrost thaw induced drying of wetlands at Scotty Creek, NWT, Canada

2018 ◽  
Vol 13 (11) ◽  
pp. 114001 ◽  
Author(s):  
K M Haynes ◽  
R F Connon ◽  
W L Quinton
Keyword(s):  
Permafrost Thaw
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