High latitude North American networks operative during the IMS

1982 ◽  
pp. 159-169 ◽  
Author(s):  
Gordon Rostoker
Keyword(s):  
North American ◽  
High Latitude

scholarly journals The Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM): a parsimonious, satellite data-driven model of high-latitude CO<sub>2</sub> exchange

2015 ◽  
Vol 8 (2) ◽  
pp. 979-1027 ◽  
Author(s):  
K. A. Luus ◽  
J. C. Lin
Keyword(s):  
Eddy Covariance ◽  
North American ◽  
High Latitude ◽  
Growing Season ◽  
Growing Season Length ◽  
The North ◽  
Air Temperatures ◽  
High Latitude Region ◽  
Respiration Model ◽  
Photosynthesis And Respiration

Abstract. We introduce the Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM), a remote-sensing based approach for generating accurate, high resolution (≥1 km2, three-hourly) estimates of net ecosystem CO2 exchange (NEE). PolarVPRM simulates NEE using polar-specific vegetation classes, and by representing high-latitude influences on NEE. We present a description, validation, and error analysis (first-order Taylor expansion) of PolarVPRM, followed by an examination of per-pixel trends (2001–2012) in model output for the North American terrestrial region north of 55° N. PolarVPRM was validated against eddy covariance observations from nine North American sites, of which three were used in model calibration. PolarVPRM performed well over all sites. Model intercomparisons indicated that PolarVPRM showed slightly better agreement with eddy covariance observations relative to existing models. Trend analysis (2001–2012) indicated that warming air temperatures and drought stress in forests increased growing season rates of respiration, and decreased rates of net carbon uptake by vegetation when air temperatures exceeded optimal temperatures for photosynthesis. Concurrent increases in growing season length at Arctic tundra sites allowed increases in photosynthetic uptake over time by tundra vegetation. PolarVPRM estimated that the North American high-latitude region changed from a carbon source (2001–2004) to sink (2005–2010) to source (2011–2012) in response to changing environmental conditions.

scholarly journals Wildfire impacts on hydrologic ecosystem services in North American high-latitude forests: A scoping review

2020 ◽  
Vol 581 ◽  
pp. 124360 ◽  
Author(s):  
François-Nicolas Robinne ◽  
Dennis W. Hallema ◽  
Kevin D. Bladon ◽  
James M. Buttle
Keyword(s):  
Ecosystem Services ◽  
Scoping Review ◽  
North American ◽  
High Latitude

scholarly journals Allelic variation of vernalization and photoperiod response genes in a diverse set of North American high latitude winter wheat genotypes

PLoS ONE ◽  
2018 ◽  
Vol 13 (8) ◽  
pp. e0203068 ◽  
Author(s):  
Alexander Whittal ◽  
Mina Kaviani ◽  
Robert Graf ◽  
Gavin Humphreys ◽  
Alireza Navabi
Keyword(s):  
Winter Wheat ◽  
North American ◽  
High Latitude ◽  
Allelic Variation ◽  
Photoperiod Response ◽  
Wheat Genotypes

scholarly journals Simulating the effects of climate change on the carbon balance of North American high-latitude forests

2000 ◽  
Vol 6 (S1) ◽  
pp. 185-195 ◽  
Author(s):  
A. R. Keyser ◽  
J. S. Kimball ◽  
R. R. Nemani ◽  
S. W. Running
Keyword(s):  
Climate Change ◽  
North American ◽  
High Latitude ◽  
Carbon Balance

scholarly journals The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO<sub>2</sub> exchange

2015 ◽  
Vol 8 (8) ◽  
pp. 2655-2674 ◽  
Author(s):  
K. A. Luus ◽  
J. C. Lin
Keyword(s):  
Eddy Covariance ◽  
North American ◽  
High Latitude ◽  
Growing Season ◽  
Growing Season Length ◽  
The North ◽  
Air Temperatures ◽  
High Latitude Region ◽  
Respiration Model ◽  
Photosynthesis And Respiration

Abstract. We introduce the Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM), a remote-sensing-based approach for generating accurate, high-resolution (≥ 1 km2, 3 hourly) estimates of net ecosystem CO2 exchange (NEE). PolarVPRM simulates NEE using polar-specific vegetation classes, and by representing high-latitude influences on NEE, such as the influence of soil temperature on subnivean respiration. We present a description, validation and error analysis (first-order Taylor expansion) of PolarVPRM, followed by an examination of per-pixel trends (2001–2012) in model output for the North American terrestrial region north of 55° N. PolarVPRM was validated against eddy covariance (EC) observations from nine North American sites, of which three were used in model calibration. Comparisons of EC NEE to NEE from three models indicated that PolarVPRM displayed similar or better statistical agreement with eddy covariance observations than existing models showed. Trend analysis (2001–2012) indicated that warming air temperatures and drought stress in forests increased growing season rates of respiration, and decreased rates of net carbon uptake by vegetation when air temperatures exceeded optimal temperatures for photosynthesis. Concurrent increases in growing season length at Arctic tundra sites allowed for increases in photosynthetic uptake over time by tundra vegetation. PolarVPRM estimated that the North American high-latitude region changed from a carbon source (2001–2004) to a carbon sink (2005–2010) to again a source (2011–2012) in response to changing environmental conditions.

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