Secular trends in high northern latitude temperature reconstructions based on tree rings

1993 ◽  
Vol 25 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Rosanne D. D'Arrigo ◽  
Gordon C. Jacoby
Keyword(s):  
Tree Rings ◽  
Secular Trends ◽  
High Northern Latitude ◽  
Northern Latitude ◽  
Temperature Reconstructions

First report of Wohlfahrtiimonas chitiniclastica from soft tissue and bone infection at an unusually high northern latitude

2014 ◽  
Vol 60 (2) ◽  
pp. 155-158 ◽  
Author(s):  
Siiri Kõljalg ◽  
Kaidi Telling ◽  
Kristi Huik ◽  
Marko Murruste ◽  
Virve Saarevet ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Bone Infection ◽  
High Northern Latitude ◽  
First Report ◽  
Northern Latitude

scholarly journals Analysis of CO<sub>2</sub> mole fraction data: first evidence of large-scale changes in CO<sub>2</sub> uptake at high northern latitudes

2015 ◽  
Vol 15 (5) ◽  
pp. 7089-7139 ◽  
Author(s):  
J. M. Barlow ◽  
P. I. Palmer ◽  
L. M. Bruhwiler ◽  
P. Tans
Keyword(s):  
Wavelet Transform ◽  
Mole Fraction ◽  
Large Scale ◽  
Time Derivative ◽  
Indirect Evidence ◽  
Transform Method ◽  
Regional Patterns ◽  
High Northern Latitude ◽  
Northern Latitude ◽  
Uptake And Release

Abstract. Atmospheric variations of carbon dioxide (CO2) mole fraction reflect changes in atmospheric transport and regional patterns of surface emission and uptake. We report new estimates for changes in the phase and amplitude of observed high northern latitude CO2 seasonal variations, indicative of biospheric changes, by spectrally decomposing multi-decadal records of surface CO2 mole fraction using a wavelet transform to isolate the changes in the observed seasonal cycle. We also perform similar analysis of the first time derivative of CO2 mole fraction, ΔtCO2, that is a crude proxy for changes in CO2 flux. Using numerical experiments, we quantify the aliasing error associated with independently identifying trends in phase and peak uptake and release to be 10–25%, with the smallest biases in phase associated with the analysis of ΔtCO2. We report our analysis from Barrow, Alaska (BRW) during 1973–2013, which is representative of the broader Arctic region. We determine an amplitude trend of 0.09 ± 0.02 ppm yr−1, which is consistent with previous work. Using ΔtCO2 we determine estimates for the timing of the onset of net uptake and release of CO2 of −0.14 ± 0.14 and −0.25 ± 0.08 days yr−1, respectively, and a corresponding uptake period of −0.11 ± 0.16 days yr−1, which are significantly different to previously reported estimates. We find that the wavelet transform method has significant skill in characterizing changes in the peak uptake and release. We find a trend of 0.65 ± 0.34% (p< 0.01) and 0.42 ± 0.34% (p<0.05) for rates of peak uptake and release, respectively. Our analysis does not provide direct evidence about the balance between uptake and release of carbon, but changes in the peak uptake and release together with an invariant growing period length provides indirect evidence that high northern latitude ecosystems are progressively taking up more carbon.

scholarly journals Using δ<sup>13</sup>C-CH<sub>4</sub> and δD-CH<sub>4</sub> to constrain Arctic methane emissions

2016 ◽  
Author(s):  
Nicola J. Warwick ◽  
Michelle L. Cain ◽  
Rebecca Fisher ◽  
James L. France ◽  
David Lowry ◽  
...  
Keyword(s):  
Global Scale ◽  
Methane Emissions ◽  
Process Models ◽  
High Northern Latitude ◽  
Model Simulations ◽  
Mixing Ratios ◽  
Northern Latitude ◽  
Northern Latitudes ◽  
Atmospheric Observations ◽  
Shelf Region

Abstract. We present a global methane modelling study assessing the sensitivity of Arctic atmospheric CH4 mole fractions, δ13C-CH4 and δD-CH4 to uncertainties in Arctic methane sources. Model simulations include methane tracers coloured by source and isotopic composition and are compared with atmospheric data at four high northern latitude measurement sites. We find the model's ability to capture the magnitude and phase of observed seasonal cycles of CH4 mixing ratios, δ13C-CH4 and δD-CH4 in high northern latitudes is much improved using a later spring kick-off and autumn decline in high northern latitude wetland emissions than predicted by most process models. Results from our model simulations indicate that recent predictions of large methane emissions from thawing submarine permafrost in the East Siberian Arctic Shelf region could only be reconciled with global scale atmospheric observations by making large adjustments to high latitude emission inventories.

Severe vitamin D deficiency is common in critically ill patients at a high northern latitude

2016 ◽  
Vol 60 (9) ◽  
pp. 1289-1296 ◽  
Author(s):  
R. B. Kvaran ◽  
M. I. Sigurdsson ◽  
S. J. Skarphedinsdottir ◽  
G. H. Sigurdsson
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Critically Ill ◽  
Critically Ill Patients ◽  
High Northern Latitude ◽  
Severe Vitamin ◽  
Northern Latitude

A new high northern latitude dinocyst-based magneto-biostratigraphic calibration for the Norwegian-Greenland Sea

2019 ◽  
Vol 52 (4) ◽  
pp. 435-460 ◽  
Author(s):  
James S. Eldrett ◽  
Ian C. Harding ◽  
Rob Wilshaw ◽  
Chuang Xuan
Keyword(s):  
Greenland Sea ◽  
High Northern Latitude ◽  
Northern Latitude
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