Time series plots of selected data from stations
A through F and from the National Data Buoy Center Ambrose Light
buoy are presented to provide an overview of the observations. Plots
were generated using either hour-averaged data, which show fluctuations
with periods of hours, or low-pass filtered data, which show fluctuations
with periods of a few days. The low-pass filter removes fluctuations at tidal periods.
Types of Time Series Plots:
Time Series Plots of Meteorological Observations:
Meterological observations at Ambrose Light Station (ALNS06):
Air temperature (degrees C), barometric pressure (mb),
wind speed (m/s), and significant wave height (m).
The data from this station was used to calculate the wind stress
plotted with the other time series plots in this report.
Ambrose
Data
Time Series Plots of Temperature:
Hourly-averaged temperature (degrees Celsius):
A B
C
D
E
F
PDF
with
every station
Hourly-averaged surface temperature (degrees Celsius) at all
stations:
Surface
temperature, all stations
Hourly-averaged bottom temperature (degrees Celsius) at all
stations:
Bottom
temperature, all stations
Time Series Plots of Salinity:
Hourly-averaged salinity (in practical salinity units (PSU)):
A
B
C
D
E
F
PDF
with every station
Hourly-averaged surface salinity (in practical salinity units
(PSU)) at all stations:
Surface
salinity, all stations
Hourly-averaged bottom salinity (in practical salinity units
(PSU)) at all stations:
Bottom
salinity, all stations
Time Series Plots of Attenuation, Optical
Backscatter, and Acoustic Backscatter :
Hourly-averaged beam attenuation (m-1) and optical
backscatter (volts): At Stations A-E two near-bottom OBS
sensors were deployed. No instrumentation was deployed at Station
F for measuring optical properties.
A
B
C
D
E
PDF
with every station
Standard deviation of bottom pressure, near-bottom current speed,
and optical backscatter: Hourly-averaged standard deviation
of pressure (mb), current speed (cm/s)
and optical backscatter (volts) from instrumentation near the bottom.
At some stations, more than one instrument measured near-bottom
beam attenuation and optical backscatter; both are included. Station
F had no instrumentation for measuring optical properties.
A B
C
D
E
PDF
with every station
Image plot of ABS backscatter intensity at Station A and B:
Backscatter intensity in the bottom 1 m at Stations A and B,
wave velocity, and bottom current speed. Red indicates high intensity.
A
and B
Time Series Plots of Pressure:
Low-passed wind stress (from Ambrose Light tower), low-passed bottom
pressure (mb), and hour-averaged bottom pressure (mb):
The mean has been subtracted from the pressure record prior to
plotting. The increase in pressure at the end of the deployment at
Station B is when the tripod was dragged and tipped over during an
attempt to recover the system by dragging after the recovery system
failed.
A
B
C
D
E
F
PDF
with every station
Time Series Plots of Current by Station:
Low-passed wind stress (from Ambrose Light tower) and low-passed
currents (measured by ADCP): Whisker plots of low-passed
current at nominally 5 and 15 meters below the surface and at the
deepest depth available (Stations A, D and E), or at nominally 5,
15, 30, and 45 meters below the surface and at the deepest depth
available (Stations B, C, and F). All currents are in cm/s.
A
B
C
D
E
F
PDF
with every station
Image plots of low-passed current (ADCP): Whisker
plot of low-passed wind stress, and image plots of low-passed eastward
and northward current from ADCP observations. ADCP
currents are shown for each 1 m bin, color coded by strength. Maroon
squares indicate no data.
A
B
C
D
E
F
PDF
with every station
Image plots of low-passed along-valley and cross-valley current
(ADCP): Whisker plot of low-passed wind stress,
and low-passed along-valley and cross-valley current from ADCP
observations. ADCP currents are shown for each 1 m
bin, color coded by strength. Maroon (Stations A and B) or blue
squares (Stations C and F) indicate no data. Currents have been
rotated along the axis of the valley; rotations by station were:
A, 0 degrees; B, 15 degrees, C, 65 degrees; F, 80 degrees.
A
B
C
F
Along-valley
component at Stations A, B, C and F
PDF
of all along-valley current (ADCP)
Animation of ADCP data: The ADCP data
can also be viewed using the USGS
Velocity Profiler Viewer (VPV) (water.wr.usgs.gov/program/sfbay/vpv/), a program that creates an animation
of the current at all depths measured by the ADCP. The VPV data
files (with extension .vpv) necessary for viewing using VPV are
included in this report for each station. In order to view these
files, download the free VPV viewer program (vpv.exe). To run VPV,
navigate to the .vpv file in windows, double click on the .vpv file,
and choose the vpv.exe program to open. Right click on the animation
for help.
Hourly averaged data: files on this DVD, in directory NewYorkCD/Data_Files/Tri_Moor_Data/VPV
with filename stationname_VPV_file.vpv:
A
B
C
D
E
F
Low-passed data: files on this DVD, in directory NewYorkCD/Data_Files/Tri_Moor_Data/VPV
with filename stationname_VPV_file_lp.vpv:
A
B
C
D
E
F
Time Series Plots of Current at all
Stations at Selected Depths:
Low-passed current at 5, 15, 30 and 45 m below surface at Stations
A-F: Whisker plots of low-passed currents measured by ADCP
from all stations at nominally 5, 15, 30, and 45 meters below the
surface (when available) and from the deepest depth available. Currents
in cm/s. No measurements at 30 and 45 m below surface
at Stations A, D and E.
5 mbs 15
mbs 30
mbs 45
mbs Bottom
PDF
with every depth
Low-passed wind stress and current at 5, 15, and near bottom
at stations D and E: Whisker plots of low-passed wind stress
(from Ambrose Light tower) and low-passed currents at nominally
5 and 15 meters below the surface and at the deepest depth available
at shelf Stations D and E (all currents are in cm/s).
5
mbs 15
mbs Bottom
PDF
with every depth
Low-passed wind stress and current at 5, 15, 30, 45 and near-bottom
at stations A, B, C, and F: Whisker plots of low-passed wind
stress (from Ambrose Light tower) and low-passed currents at nominally
5, 15, 30, and 45 meters below the surface and at the deepest depth
available at valley Stations A, B, C, and F (all currents are in
cm/s).
5
mbs 15
mbs 30
mbs 45
mbs Bottom
PDF
with every depth
Low-passed wind stress and along-valley current at stations
A, B, C, and F: Whisker plots of low-passed wind stress (from
Ambrose Light tower) and low-passed currents at nominally 30 and
45 meters below the surface and at the deepest depth available for
valley Stations A, B, C, and F (all currents in cm/s).
Currents have been rotated along the axis of the valley; rotations
by station were: A, 0 degrees; B, 15 degrees, C, 65 degrees; F,
80 degrees. Positive is up-valley flow.
30
mbs 45
mbs Bottom
PDF
with every depth
Time Series Plots of Current Monthly
Mean Flow and Variability:
Monthly mean near-bottom current and principal current ellipse
(calculated from BASS/MAVS data) and wind stress:
Monthly observed mean current flow (arrows) and the variability
(shown as the ellipse centered around the tip of the mean flow arrow)
for near-bottom current for shallow Station A and the shelf stations
(D and E) and for the valley stations (A, B, and C). All currents
are in cm/s. Up is to the north and right is to the
east. Typically the current originates at the origin of the mean
flow arrow, and flows toward any point within the current ellipse.
The current ellipse calculated from the hour-averaged data is typically
dominated by the tidal currents. The low-pass filter removes the
fluctuating tidal currents. Also included is wind stress.
Hourly-averaged
data, Stations A, D, and E
Low-passed
data, Stations A, D, and E
Hourly-averaged
data, Stations A, B, C
Low-passed
data, Stations A, B, C
PDF
with all BASS/MAVS ellipse plots
Monthly mean current at selected depths and principal current
ellipse (calculated from hour-averaged ADCP data) and
wind stress: Monthly observed mean current flow (arrows) and
the variability (shown as an ellipse centered around the tip of
the mean flow arrow) for current at nominally 5 mbs,
15 mbs and at the deepest observations for shelf stations
and shallow Station A and nominally at 5 mbs, 15 mbs,
30 mbs, and at the deepest observation for Stations
B, C, and F (all currents in cm/s). Up is to the north
and right is to the east. Typically the current originates at the
origin of the mean flow arrow, and flows toward any point within
the current ellipse. The current ellipse calculated from the hour-averaged
data is typically dominated by the tidal currents. Also included
is wind stress.
A
B
C
D
E
F
PDF
with every station
Monthly mean current at selected depths and principal current
ellipse (calculated from low-passed ADCP data) and
wind stress: Monthly observed mean current flow (arrows) and
the variability (shown as an ellipse centered around the tip of
the mean flow arrow) for current at nominally 5 mbs,
15 mbs and at the deepest observations for Stations
A, D and E, and nominally at 5 mbs, 15 mbs,
30 mbs, and at the deepest observation for Stations
B, C, and F (all currents in cm/s). Up is to the north
and right is to the east. The mean flow and ellipse were calculated
for all months with more than 360 hours of data. Typically the current
originates at the origin of the mean flow arrow, and flows toward
any point within the current ellipse. The low-pass filter removes
the fluctuating tidal currents.
A
B
C
D
E
F
PDF
with every station
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