scholarly journals Penetration of the 1990s warm temperature anomaly of Atlantic Water in the Canada Basin

2004 ◽  
Vol 31 (20) ◽  
Author(s):  
Koji Shimada
Keyword(s):  
Temperature Anomaly ◽  
Atlantic Water ◽  
Canada Basin ◽  
Warm Temperature

scholarly journals Assessing Prone Areas to Heavy Rainfall and the Impaction of the Upper Warm Temperature Anomaly during March–May Rainfall Season in Tanzania

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Kantamla Biseke Mafuru ◽  
Tan Guirong
Keyword(s):  
Heavy Rainfall ◽  
Temperature Anomaly ◽  
Temporal Distribution ◽  
Warning System ◽  
Congo Basin ◽  
Horizontal Wind ◽  
Warm Temperature ◽  
Rainfall Season ◽  
Key Factor ◽  
Upper Level

This study analyses the spatial and temporal distribution of heavy rainfall events (HREs) and its associated circulation anomalies over Tanzania during March to May (MAM) rainfall season of 1980–2010. A total of 822 HREs were revealed, concentrated over the northern sector (NS) of the country. Years with anomalous HREs are associated with low-level westerly convergence, advection of moisture from both the Indian Ocean and Congo basin, an upper warm temperature anomaly (UWTA), intensified and well-positioned Intertropical Convergence Zone (ITCZ), and pronounced rising motion since the ascending limb of the Walker type of circulation is centered over Tanzania. The analysis of the UWTA in this study has brought a key factor in exploring the possible likely cause and improved early warning system for the HREs during the MAM rainfall season in Tanzania. Making use of the thermal wind equation and the velocity divergent form of the continuity equation (DFCE), we found that the UWTA results into an upper-level horizontal wind divergence which significantly accelerates vertical ascent, deepening the surface low pressure for an enhanced convective process and HREs formation.

scholarly journals The Atlantic Water Boundary Current in the Chukchi Borderland and Southern Canada Basin

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
Jianqiang Li ◽  
Robert S. Pickart ◽  
Peigen Lin ◽  
Frank Bahr ◽  
Kevin R. Arrigo ◽  
...  
Keyword(s):  
Atlantic Water ◽  
Canada Basin ◽  
Boundary Current ◽  
Chukchi Borderland

Atlantic Water Circulation in the Canada Basin

ARCTIC ◽  
1974 ◽  
Vol 27 (4) ◽  
Author(s):  
J.L. Newton ◽  
L.K. Coachman
Keyword(s):  
Atlantic Water ◽  
Water Circulation ◽  
Canada Basin

scholarly journals Inferring Circulation and Lateral Eddy Fluxes in the Arctic Ocean’s Deep Canada Basin Using an Inverse Method

2018 ◽  
Vol 48 (2) ◽  
pp. 245-260 ◽  
Author(s):  
Hayley V. Dosser ◽  
Mary-Louise Timmermans
Keyword(s):  
Inverse Method ◽  
Large Scale ◽  
Barents Sea ◽  
Function Analysis ◽  
Water Layer ◽  
Atlantic Water ◽  
Canada Basin ◽  
The Arctic ◽  
Central Basin ◽  
Beaufort Gyre

AbstractThe deep waters in the Canada Basin display a complex temperature and salinity structure, the evolution of which is poorly understood. The fundamental physical processes driving changes in these deep water masses are investigated using an inverse method based on tracer conservation combined with empirical orthogonal function analysis of repeat hydrographic measurements between 2003 and 2015. Changes in tracer fields in the deep Canada Basin are found to be dominated by along-isopycnal diffusion of water properties from the margins into the central basin, with advection by the large-scale Beaufort Gyre circulation as well as localized, vertical mixing playing important secondary roles. In the Barents Sea branch of the Atlantic Water layer, centered around 1200-m depth, diffusion is shown to be nearly twice as important as advection to lateral transport. Along-isopycnal diffusivity is estimated to be ~300–600 m2 s−1. Large-scale circulation patterns and lateral advective velocities associated with the anticyclonic Beaufort Gyre are inferred, with an average speed of 0.6 cm s−1. Below about 1500 m, along-isopycnal diffusivity is estimated to be ~200–400 m2 s−1.

scholarly journals Deepening of the Atlantic Water Core in the Canada Basin in 2003–11

2014 ◽  
Vol 44 (9) ◽  
pp. 2353-2369 ◽  
Author(s):  
Wenli Zhong ◽  
Jinping Zhao
Keyword(s):  
Surface Stress ◽  
Large Scale ◽  
Atlantic Water ◽  
Canada Basin ◽  
The Arctic ◽  
Western Basin ◽  
Beaufort Gyre ◽  
Ice Retreat ◽  
Depth Relationship ◽  
Enhanced Surface

Abstract In 2004, a cold mode of Atlantic Water (AW) entered the western Canada basin, replacing the anomalously warm AW that resided in the basin since the 1990s. This slightly colder AW was denser than the 1990s warm mode; it gradually filled most of the western basin by 2009. The enhanced surface stress curl led to the spinup of the Beaufort Gyre and convergence of freshwater. The spinup also resulted in a deepening of the AW core at the center of the gyre and in shoaling of the AW core at the margins of the gyre. The density versus depth relationship revealed in this study shows that the depth of the maximum AW temperature was mainly controlled by the density structure before 2007; thus, it is the case when the denser water was deeper and the case when the lighter water was shallower around the basin. However, this relationship was reversed to become the case when the denser water was shallower and the case when the lighter water was deeper since 2008 inside the Beaufort Gyre. The combined effect of density and sea ice retreat that enhanced surface stress curl determined the depth of the AW inside the Beaufort Gyre since 2008. The deepening of the AW core and expanding of the area where the AW deepening occurred had a profound effect on the large-scale circulation in the Arctic Ocean.

scholarly journals Joint effects of boundary currents and thermohaline intrusions on the warming of Atlantic water in the Canada Basin, 1993–2007

2009 ◽  
Vol 114 ◽  
Author(s):  
Fiona A. McLaughlin ◽  
Eddy C. Carmack ◽  
William J. Williams ◽  
Sarah Zimmermann ◽  
Koji Shimada ◽  
...  
Keyword(s):  
Atlantic Water ◽  
Canada Basin ◽  
Joint Effects ◽  
Boundary Currents ◽  
Thermohaline Intrusions
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