scholarly journals In Situ Field Sequencing and Life Detection in Remote (79°26′N) Canadian High Arctic Permafrost Ice Wedge Microbial Communities

2017 ◽  
Vol 8 ◽  
Author(s):  
J. Goordial ◽  
Ianina Altshuler ◽  
Katherine Hindson ◽  
Kelly Chan-Yam ◽  
Evangelos Marcolefas ◽  
...  
Keyword(s):  
Microbial Communities ◽  
High Arctic ◽  
Canadian High Arctic ◽  
Ice Wedge ◽  
Life Detection

In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019

2021 ◽  
Vol 250 ◽  
pp. 118254
Author(s):  
Andy Vicente-Luis ◽  
Samantha Tremblay ◽  
Joelle Dionne ◽  
Rachel Y.-W. Chang ◽  
Pierre F. Fogal ◽  
...  
Keyword(s):  
High Arctic ◽  
Canadian High Arctic ◽  
Microphysical Properties ◽  
Tropospheric Aerosols

scholarly journals Validating the performance of the Empirical Canadian High Arctic Ionospheric Model (E-CHAIM) with in situ observations from DMSP and CHAMP

2019 ◽  
Vol 9 ◽  
pp. A21
Author(s):  
David R. Themens ◽  
P. Thayyil Jayachandran ◽  
Anthony M. McCaffrey
Keyword(s):  
Electron Density ◽  
Model Fitting ◽  
High Arctic ◽  
Ionospheric Model ◽  
Canadian High Arctic ◽  
Defense Meteorological Satellite Program ◽  
Fitting In ◽  
Meteorological Satellite ◽  
Rms Errors

The Empirical Canadian High Arctic Ionospheric Model (E-CHAIM) is a new empirical model of high latitude ionospheric electron density. While the introductory studies regarding E-CHAIM include validations, E-CHAIM’s topside model was notably excluded from independent validation using datasets not included in the model fitting. In this study, we undertake such a validation using in situ electron density observations from the Defense Meteorological Satellite Program (DMSP) constellation of satellites and the Challenging Mini-satellite Payload (CHAMP) mission. Through this validation, we show that E-CHAIM generally outperforms the International Reference Ionosphere (IRI) at DMSP orbit (~830 km altitude), with RMS errors of 8.3–9.8 × 109 e/m3 versus the IRI’s 1.2–1.3 × 1010 e/m3. E-CHAIM’s improvement over the IRI is consistent at all latitudes but is particularly noted in sub-auroral regions and is mainly limited to summer and equinox periods. At CHAMP orbit, E-CHAIM and the IRI are found to perform largely comparably, with E-CHAIM outperforming the IRI only marginally with RMS errors of 7.11 × 1010 e/m3 versus the IRI’s 7.48 × 1010 e/m3. This improvement is found to be largely constrained to sub-auroral latitudes with both models performing comparably at higher latitudes. An observed tendency for the IRI to overestimate electron density in the near-peak (at CHAMP orbit) and underestimate electron density at higher altitudes (DMSP orbit) appears to be consistent with previous work, which identified this pattern to result from shortcomings in the NeQuick topside function curvature at high latitudes.

scholarly journals Low-Temperature Sulfidic-Ice Microbial Communities, Borup Fiord Pass, Canadian High Arctic

2018 ◽  
Vol 9 ◽  
Author(s):  
Christopher B. Trivedi ◽  
Graham E. Lau ◽  
Stephen E. Grasby ◽  
Alexis S. Templeton ◽  
John R. Spear
Keyword(s):  
Low Temperature ◽  
Microbial Communities ◽  
High Arctic ◽  
Canadian High Arctic

Structural variation in the songs of Atlantic walruses breeding in the Canadian High Arctic

2003 ◽  
Vol 29 (2) ◽  
pp. 297-318 ◽  
Author(s):  
Becky Sjare ◽  
Ian Stirling ◽  
Cheryl Spencer
Keyword(s):  
Structural Variation ◽  
High Arctic ◽  
Canadian High Arctic

scholarly journals Metagenomic Characterization of Microbial Communities In Situ Within the Deeper Layers of the Ileum in Crohn’s Disease

2016 ◽  
Vol 2 (5) ◽  
pp. 563-566.e5 ◽  
Author(s):  
Chandra Sekhar Pedamallu ◽  
Ami S. Bhatt ◽  
Susan Bullman ◽  
Sharyle Fowler ◽  
Samuel S. Freeman ◽  
...  
Keyword(s):  
Crohn’S Disease ◽  
Crohn's Disease ◽  
Microbial Communities
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