[pccgrads] APL Seminar TODAY: vLeBras on Freshwater Transport in East Greenland Current System

UW Program On Climate Change uwpcc at uw.edu
Mon Jun 17 07:40:56 PDT 2019

Applied Physics Laboratory Seminar Series -- Spring 2019

>>>>>> APL Special Seminar <<<<<<<
>>>>>> NOTE: Day <<<<<<<

Speaker: Isabella LeBras
Postdoctoral Scholar
Scripps Institution of Oceanography
La Jolla, California


Time: Monday, June 17, 2:30 PM <---------- NOTE: Day

(Coffee/Tea, Cookies and Conversation at 2:00PM)

Place: APL Hardisty Conference Center


Isabela Le Bras, Fiamma Straneo, James Holte, and N. Penny Holliday

The Greenland ice sheet and Arctic sea ice store freshwater which has
the potential to alter
global ocean circulation and climate. Notably, freshwater flowing into
the ocean east of
Greenland is likely to spread to the ocean interior and impact the
sinking of surface waters.
I will present the first year-round observations of the East Greenland
Current system (August
2014 - August 2016) which were collected as part of OSNAP (Overturning
in the Subpolar North
Atlantic Program) [Le Bras et al. 2018].

Using a set of eight moorings southeast of Greenland at 60N, we find two
distinct, persistent
velocity cores on the shelf and slope. These are the East Greenland
Coastal Current (EGCC),
which carries cold, fresh water from the Arctic and Greenland along the
shelf, and the East
Greenland/Irminger Current (EGIC) over the slope, which includes cold,
fresh waters as well as
warm, salty waters of Atlantic origin. We find that these currents carry
50% of the freshwater
transport across the eastern subpolar North Atlantic. The freshwater
transport is
approximately equipartitioned between the coastal current (EGCC) and the
fresh portion of the
slope current (EGIC). The coastal and slope current freshwater
transports have staggered
seasonality, peaking in December and March respectively, suggesting that
summer surveys
underestimate freshwater transport in this region, particularly over the
slope. The
variability in the two currents is consistent with two distinct
wind-driven mechanisms.

I place these results into the context of the potential upstream sources
of freshwater, while
stressing the sensitivity of freshwater budgets to the reference
salinity. The Arctic and
regional precipitation appear to be greater sources of freshwater than
the Greenland Ice Sheet
thus far.



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