Acoustic propagation from the Canadian Basin to the Chukchi Shelf

2017 ◽  
Vol 142 (4) ◽  
pp. 2713-2713 ◽  
Author(s):  
Megan S. Ballard ◽  
Jason D. Sagers ◽  
Ying-Tsong Lin ◽  
Mohsen Badiey ◽  
Peter F. Worcester ◽  
...  
Keyword(s):  
Acoustic Propagation ◽  
Canadian Basin ◽  
Chukchi Shelf

scholarly journals Phytoplankton distribution in the Western Arctic Ocean during a summer of exceptional ice retreat

2011 ◽  
Vol 8 (4) ◽  
pp. 6919-6970 ◽  
Author(s):  
P. Coupel ◽  
H. Y. Jin ◽  
D. Ruiz-Pino ◽  
J. F. Chen ◽  
S. H. Lee ◽  
...  
Keyword(s):  
Primary Production ◽  
Ice Melting ◽  
Phytoplankton Distribution ◽  
Pacific Waters ◽  
Phytoplankton Communities ◽  
Ice Retreat ◽  
Western Arctic ◽  
Canadian Basin ◽  
Chukchi Borderland ◽  
Chukchi Shelf

Abstract. A drastic ice decline in the Arctic Ocean, triggered by global warming, could generate rapid changes in the upper ocean layers. The ice retreat is particularly intense over the Canadian Basin where large ice free areas were observed since 2007. The CHINARE 2008 expedition was conducted in the Western Arctic (WA) ocean during a year of exceptional ice retreat (August–September 2008). This study investigates whether a significant reorganization of the primary producers in terms of species, biomass and productivity has to be observed in the WA as a result of the intense ice melting. Both pigments (HPLC) and taxonomy (microscopy) acquired in 2008 allowed to determine the phytoplanktonic distribution from Bering Strait (65° N) to extreme high latitudes over the Alpha Ridge (86° N) encompassing the Chukchi shelf, the Chukchi Borderland and the Canadian Basin. Two different types of phytoplankton communities were observed. Over the ice-free Chukchi shelf, relatively high chl-a concentrations (1–5 mg m−3) dominated by 80 % of diatoms. In the Canadian Basin, surface waters are oligotrophic (<0.1 mg m−3) and algal assemblages were dominated by haptophytes and diatoms while higher biomasses (~0.4 mg m−3) related to a deep Subsurface Chlorophyll Maximum (SCM) are associated to small-sized (nano and pico) phytoplankton. The ice melting onset allows to point out three different zones over the open basin: (i) the ice free condition characterized by deep and unproductive phytoplankton communities dominated by nanoplankton, (ii) an extended (78°–83° N) Active Melting Zone (AMZ) where light penetration associated to the stratification start off and enough nutrient availability drives to the highest biomass and primary production due to both diatoms and large flagellates, (iii) heavy ice conditions found north to 83° N allowing light limitation and consequently low biomass and primary production associated to pico and nanoplankton. To explain the poverty (Canadian Basin) and the richness (Chukchi shelf) of the WA, we explore the role of the nutrient-rich Pacific Waters, the bathymetry and two characteristics linked to the intense ice retreat: the stratification and the Surface Freshwater Layer (SFL). The freshwater accumulation induced a strong stratification limiting the nutrient input from the subsurface Pacific waters. This results in a biomass impoverishment of the well-lit layer and compels the phytoplankton to grow in subsurface. The phytoplankton distribution in the Chukchi Borderland and north Canadian Basin, during the summer of exceptional ice retreat (2008), suggested when compared to in-situ data from a more ice covered year (1994), recent changes with a decrease of the phytoplankton abundance while averaged biomass was similar. The 2008 obtained phytoplankton data in the WA provided a state of the ecosystem which will be useful to determine both past and future changes in relation with predicted sea ice decline.

Sound propagation from the Canadian Basin to the Chukchi shelf during Summer 2015

2016 ◽  
Vol 139 (4) ◽  
pp. 2198-2198
Author(s):  
Mohsen Badiey ◽  
Justin Eickmeier ◽  
Andreas Muenchow ◽  
Y T. Lin ◽  
Timothy Duda ◽  
...  
Keyword(s):  
Sound Propagation ◽  
Canadian Basin ◽  
Chukchi Shelf

The effects of ice cover and oceanography on medium-frequency acoustic propagation on the Chukchi Shelf

2018 ◽  
Vol 144 (3) ◽  
pp. 1666-1666
Author(s):  
Sean Pecknold ◽  
Christopher Whitt ◽  
Ildar R. Urazghildiiev ◽  
Michelle Weirathmueller ◽  
Mohsen Badiey ◽  
...  
Keyword(s):  
Ice Cover ◽  
Acoustic Propagation ◽  
Medium Frequency ◽  
Chukchi Shelf

Overview of one year acoustical oceanography measurements on Chukchi shelf during Shallow Water Canada Basin Acoustic Propagation Experiment 2016–2017

2018 ◽  
Vol 144 (3) ◽  
pp. 1666-1666
Author(s):  
Mohsen Badiey ◽  
Justin Eickmeier ◽  
Ying-Tsong Lin ◽  
Altan Turgut ◽  
Sean Pecknold ◽  
...  
Keyword(s):  
Shallow Water ◽  
Acoustic Propagation ◽  
Canada Basin ◽  
Propagation Experiment ◽  
One Year ◽  
Chukchi Shelf

Measured surface and bottom reflection loss and scattering on the Chukchi Shelf observed during the 2016–2017 Canada Basin Acoustic Propagation Experiment

2019 ◽  
Vol 146 (4) ◽  
pp. 2796-2796
Author(s):  
Sean Pecknold ◽  
Carolyn M. Binder ◽  
Mohsen Badiey ◽  
Jason D. Sagers ◽  
Megan S. Ballard ◽  
...  
Keyword(s):  
Reflection Loss ◽  
Acoustic Propagation ◽  
Canada Basin ◽  
Propagation Experiment ◽  
Chukchi Shelf

ACOUSTIC PROPAGATION IN AN EPOXY RESIN AT VERY LOW TEMPERATURES

1982 ◽  
Vol 43 (C9) ◽  
pp. C9-509-C9-511
Author(s):  
P. Doussineau ◽  
W. Schön
Keyword(s):  
Epoxy Resin ◽  
Low Temperatures ◽  
Acoustic Propagation

Simplification of real-world terrain for outdoor acoustic propagation modeling

2016 ◽  
Vol 64 (3) ◽  
pp. 314-323
Author(s):  
Frank Mobley ◽  
Tiffanie Moore ◽  
Matthew Davis
Keyword(s):  
Real World ◽  
Acoustic Propagation ◽  
Propagation Modeling
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