Peter Washam
UD POSE Graduate Student
Buoy #76:

North East Greenland Satellite Imagery:
Jan 13, 2015
Dec 27, 2014
Nov 22, 2014
Nov 6, 2014
Oct 19, 2014
Sept 8, 2014
Aug 3, 2014

Class Material
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Workshop #1:
Map Time Series

Notes:
The ITP Buoy #76 traveled ~2100km from the North Pole down towards Northeast Greenland over ~180 days in 2014.

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Workshop #2:
Profiles:
day 25: Latitude: 84.70°N Longitude: 151.9°W
Temperature and Salinity
executable file:
get
Fresh Water Content:
Time Series

Notes:
The Fresh Water Content seems to decrease as the buoy moves southward. This is likely due to the influence of Warm/Salty Atlantic Water as the buoy moves away from the Arctic Ocean.

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Workshop #3:
Fresh Water Content Information:
Information 10 Day Averages
Fresh Water Map 10 Day Average
Data:
Time, Longitude, Latitude, Fresh Water Content, Isohaline Depth (34.8 ppt)
Data

Notes:
As Mentioned above, the Fresh Water Content decreases as the buoy moves away from the Arctic. The Depth where a Salinity of 34.8 ppt is reached also becomes shallower as the buoy moves southward. This Salinity signifies Atlantic water, so it is consistent with the idea of a larger amount of Atlantic Water south of the Arctic Ocean.

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Workshop #4 & #5:
Salinities between 30.5 and 35 ppt used

Temperature, Salinity, and Density:
Profiles:
Temperature and Salinity
Density
Contours:
Temp,Sal,Dens Contours

Notes:
Salinites between 30.5ppt and 35ppt are used in order to eliminate noise from the signal. In the T-S diagram, there seems to be two interesting anomalies. The first is that there is a group of points along the freezing line, with Salinities ranging from 34.5-35ppt and a Temperature near -1.8°C. This could be the brine-rejection signal from ice formation above. The second is this group of points that has a range of Salinities from 33.25-34.25ppt and Temperatures that range from -1.5-1.5°C. These points retain a lower density than the surrounding water and could be an eddy. Both of these anomalies can be seen in the Salinity Profile between 100 and 200 m depth. The Contour plots also show some interesting Halocline variations around 160-180days where it gets very shallow.

Halocline Information:
Average N^2 maximum at: 50m, -1.5 °C, 34ppt, and 1027.5 g/cm^3
This maximum in N^2 defines the halocline
Secondary maximas around 100m and 250m, and likely have to do with separation between Arctic and Atlantic waters
Time Series:
N^2 Maxima
Primary Maxima vary between ~5m and ~95m with sparse values deeper. Deepest Maximas are found North East of Greenland.
Profiles:
N^2 Stability Profile
Contours:
N^2 Contours

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Workshop #6:
Speed of Sound in Sea Water
Mean Profile:
C Profile
Contours:
C Contours

Notes

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Workshop #7:
Thermal Wind:
In this exercise we take data 5 Days apart:
Density Measurements

Vertical Shear:
Depth Profile Contour Plot
Velocity field:
Velocity (10 days) Velocity (5days) Velocity (1 day)

As the temporal resolution increases in these figures, the contours blur and some of the eddies present are hidden. Here we zoom in on the eddies present in the halocine resolved in the 0.5 day Velocity field. Positve Velocity contours signify flow into the page, while negative contours signify flow out of the page .

Eddies:
Eddy 1 Eddy 2 Eddy 3 Eddy 4 Eddy 5

Map:
Geostrophic Velocity Across Track

Notes:
Notes

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Workshop #8:
Drift Velocity
Time Series
U and V prime Histograms
Outer red lines denote 95% confidence interval based off of 1.96 standard deviations, with the central red line denoting the mean.

Auto Correlations:
Uprime and Vprime

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Data:
Variables by column:
DATA retrieved from: 76

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