Surface Temp Movie: Combined remote-sensing IR and in situ measurements

 

Below is a movie of surface Temperature at the New River Inlet on May 7th 2012 during the ONR-funded RIVET I experiment.   The temperature is derived by combining airborne IR (Luc Lenain in Ken Melville’s group at SIO) with in situ temperature sensors.   The top panel shows the tide level and the arrow to the right shows the currents within the inlet (at the red dot) from the WHOI (Raubenheimer/Elgar) ADCP 05.  All times are in EDT.

 

The movie can be better viewed if you click to view it full frame.  In it one can clearly see the warm jets coming out the two inlet channels.  Much of the newchannel warm plume gets turned on the bathymetry coutours and heads in the -y direction.  In addition, the alongshore (-y) propagation hugging the coast of the warm water plume is clearly evident. This plume is about 1 deg C warmer than the water 500 m offshore.    The winds and the waves on this day were relatively strong and came from the -y quadrant, driving strong flows to the south.

The mp4 version of this movie can be downloaded here

 

 

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Nortek Vector ADV & Aquadop ADCP (Feddersen/Guza) data posted (updated 2X)

NOTE: May 3rd 2013: The .mat files have been updated again. The format is the same as below. Some compass and sensor orientation issues have been fixed. I highly recommend you use these new versions. Download details can be found at: http://blog.iod.ucsd.edu/RIVET/2012/09/04/ftp-data-site-is-now-up/

NOTE: .mat files have been updated as of Wed Dec 19th 10:45am PST.   Thanks to Peter Rogowski for finding issues with the time stamps.

——

The data from our 6 Nortek Aquadop ADCPs have also been posted to the ftp site in the directory called “adcp”.  See the link above for the ftp site info.   The instruments
are denoted A1 to A6.   The data files are called AQ_A1.mat and each holds a struct
that has various arrays of data (at 1 minute sampling) with format:

AQ_A1 =

mon: [30240x1 double]
day: [30240x1 double]
hour: [30240x1 double]
minute: [30240x1 double]
P: [30240x1 double]
TEMP: [30240x1 double]
Ur: [30240x25 double]
Vr: [30240x25 double]
SN: 2141
X: -7.095480269861441e+02
Y: -2.442293840566305e+02
lat: 34.532029999999999
lon: -77.344700000000003
t: [1x30240 double]
Z: [1x25 double]
HEADING: [30240x1 double]
PITCH: [30240x1 double]
ROLL: [30240x1 double]
time_adcp: [30240x1 double]
Amin: [30240x25 double]

——

The data from the 8 Nortek Vector ADVs has been posted to the ftp site.   Please see previous posts on how to access the ftp site.    The data is in a directory called “vector”.  The instruments are denoted V1 through V8.   Note, V5 was corrupted and is not posted.   The instrument deployment map can be found in other posts – but a map is included below.    The data is provided in MATLAB format.   My apologies for posting in a proprietary format but I think everyone can work with it.     The individual files are called
VECTOR_V1.mat   to VECTOR_V8.mat.    If you do a “load VECTOR_V!.mat” in MATLAB you’ll get a single variable struct that looks like (all samples at 1 Hz)

VEC_V1 =

U: [1833960x1 double]     % +x velocity in RIVET coord sytem m/s
V: [1833960x1 double]      % +y velocity in RIVET coord system  m/s
W: [1833960x1 double]     % +z velocity m/s
P: [1833960x1 double]      %pressure dbar-not corrected for atmospheric P changes
TEMP: [1833960x1 double]  % in deg C
AMP: [1833960x1 double]
CORR: [1833960x1 double]
mon: [1833960x1 double]    % monday (always 5)
day: [1833960x1 double]
hour: [1833960x1 double]
minute: [1833960x1 double]
second: [1833960x1 double]
SN: 470                               % serial # of instrument
vnum: 1                                  % number of the location (1-8)
time: [1x1833960 double]       % time in seconds from start of record
X: -42                                  % RIVET x coord (m)
Y: -1511                               % RIVET y coord (m)
LAT: 34.5207                          % LAT & LON
LON: -77.3522

 

Please let me know if you have any questions.   There may of course be bugs in the data set.  I will post updates here if I happen to find any.   Have fun.

Map of New Rivet Inlet NC bathymetry (from the ASACE FRF) in the RIVET coordinate system with the SIO (Feddersen/Guza) and WHOI (Raubenheimer/Elgar) ADV, ADCP, and wirewalker (WW) instrument locations as noted in the legend. The TopSail side of the inlet is below and the Camp Lejuene side is on top. SIO ADV locations are marked V1-V8. All locations also had a co-located pressure sensor Map of New Rivet Inlet NC bathymetry (from the ASACE FRF) in the RIVET coordinate system and many locations also had a co-located Rhodamine WT dye fluorometer. Dye was released either near x ≈ −600 m and y ≈ −300 m, or about 1.2 km further up the inlet towards the Inter-Coastal Waterway.

Map of New Rivet Inlet NC bathymetry (from the ASACE FRF) in the RIVET coordinate system with the SIO (Feddersen/Guza) and WHOI (Raubenheimer/Elgar) ADV, ADCP, and wirewalker (WW) instrument locations as noted in the legend. The TopSail side of the inlet is below and the Camp Lejuene side is on top. SIO ADV locations are marked V1-V8. All locations also had a co-located pressure sensor Map of New Rivet Inlet NC bathymetry (from the ASACE FRF) in the RIVET coordinate system and many locations also had a co-located Rhodamine WT dye fluorometer. Dye was released either near x ≈ −600 m and y ≈ −300 m, or about 1.2 km further up the inlet towards the Inter-Coastal Waterway.

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New River CTD+F casts

Data from CTD+F casts have now been processed.  Casts were made from a small boat on dye release days.  The CTD+F setup included a Seabird CTD and WET Labs single-channel fluorometer.  Casts were generally made from near the surface to the bed.

Below is an example of mean dye and temperature profiles from 6 May, 2012.

Average temperature (black) and Rhodamine WT dye (pink) against depth z for all profiles on May 6 2012.

Data are now available via the ftp site in a directory called CTD.   See previous posts on how to access the ftp site.  Data from each day of casts are in .mat files with filenames data_nr12_CTD_mmdd.mat, where mmdd represents the two digit month and two digit day.  Each data file contains the following variables:

>> load data_nr12_CTD_0512.mat

>> whos

Name         Size            Bytes  Class     Attributes

Dgrid      101×50            40400  double

Sgrid      101×50            40400  double

Tgrid      101×50            40400  double

date         1×8                16  char

tcast       50×1               400  double

xcast       50×1               400  double

ycast       50×1               400  double

zgrid      101×1               808  double

“Dgrid”, “Tgrid”, and “Sgrid” are the dye (ppb), temperature (deg C), and salinity (psu) vertical profiles for each day of casts, where each column is an individual cast.  Data are interpolated onto “zgrid”, which spans the water column from the surface (z = 0 m) to the depth of the deepest cast with 0.1 m vertical resolution.  Data below the deepest point of a given cast are filled with NaNs.  For the example variables above, if

>> [m,n] = size(Dgrid)

then m = 101 is the number of vertical grid points (z = 0 to -10 m), and n = 50 is the number of casts.

The variables “tcast”, “xcast”, and “ycast” give the times and locations of each cast, where, e.g., tcast(k) corresponds to Dgrid(:,k).  Time units for “tcast” are in seconds (EDT) of the given day (which is saved in each .mat file as the variable “date”).  The variables “xcast” and “ycast” are the familiar RIVET coordinates x and y, respectively, both in meters.

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New River Inlet Jetski data now posted on ftp site

The jetski data from the RIVET I experiment at the New River Inlet is now posted at our ftp site.  If you do not have ftp access, please contact falk for access.  Below are two examples of the Dye and Temperature data from two days superimposed on the New River Inlet bathymetry.

Surface dye (left, ppb) and temperature (right, ◦C) observations from (top) May 6th and (bottom) May 8th at the New River Inlet NC measured by a SIO dye and temperature mapping jetski. On May 6th, dye was continuously released near (x,y)=(−400, −250) m and on May 9th, dye was point released at (x,y)=(−1000,400) m. Note how the jetskis were able to map out the dye plume structure outside of the inlet mouth and the downstream dilution as well as the temperature between the warmed inlet and the ocean.

The listing of the ftp directory looks like:

The *.pdf files are overview figures of the data similar to the figures above.

The data files look like  data_ski_mmdd_[old,new].mat, where [new,old] are the names of our two skis.    mmdd is short for month and day.    Each data file contains the following variables

>> load data_ski_0506_old.mat
>> whos
Name           Size                Bytes  Class     Attributes

D          73885×1                591080  double
T          73885×1                591080  double
Xb          1001×1001            8016008  double
Xrl            7×1                    56  double
Yb          1001×1001            8016008  double
Yrl            7×1                    56  double
Zb          1001×1001            8016008  double
batt       73885×1                591080  double
date           1×8                    16  char
dates          7×8                   112  char
dd             1×1                     8  double
flow1      73885×1                591080  double
flow2      73885×1                591080  double
ino            1×1                     8  double
no             1×3                     6  char
t          73885×1                591080  double
t_r0           7×1                    56  double
t_rf           7×1                    56  double
tau        73885×1                591080  double
u          73885×1                591080  double
v          73885×1                591080  double
x          73885×1                591080  double
y          73885×1                591080  double

The most relevant variables are “D” (ppb),  “T” (deg C), “x” – RIVET coordinate x, “y” RIVET coordinate y,  “t” is time in seconds of the day (EDT).     Please let us know if you have any questions.

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Movie of May 3rd Ebb Tide Drifter Trajectories

The above movie was made by Matthew Spydell. It shows May 3rd ebb tide drifter trajectories from the RIVET experiment at New River Inlet. Bathymetry is shaded. Land regions are in gray. The bar on top indicates elapsed time (in hours) since the start of the release. For more information on this release look at this blog entry.  This movie contains a lot more drifter information though.  In the original blog entry the drifters got out of radio contact so we couldn’t track them in real time.   But they log their GPS positions onboard the drifter memory.    What was interesting (as noted in the original post)  is that there was no indication that the drifters going back  onshore during the flood tide.

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FTP data site is now up

RIVET-ers:   our ftp data site is now up.   We are slowly in the process of putting processed and quality controlled data onto it.   To access the ftp site please ftp to

ftp://rivet@ftp.iod.ucsd.edu/

or use the ftp shell program and ftp to   ftp.iod.ucsd.edu  with username “rivet”

If you would like access to the data please email falk feddersen (ffeddersen at ucsd.edu) and you’ll be sent a password.

DATA POLICY & CAVEATS:   Our data policy is similar to the Raubenheimer/Elgar (WHOI) policy and is repeated here:
1) We are actively analyzing the dye and drifter data sets from New River.    If you want to use the drifter or dye data please let us know so that the same analysis is not performed twice.

2) If you use the data, we would like to be offered the opportunity to consider co-authorships. We try not to be parasites, and if we do not feel we made a contribution, we will decline.

3) If you use the data, please let us know so we can ensure our sponsors are acknowledged.

4) Please do not distribute these data to any third parties. That means if you let your students use the data, please inform them they are not to share with anyone else. Others can contact us and we will give them the data.  This practice will ensure that everyone can be kept up to date with improved quality control, and our sponsors can be acknowledged.

5) The data have undergone a significant quality control.  However, likely some wierdness remains.  If you find anything strange, please let us know and we will update the data files.

6) If you would like to collaborate, let us know. We’d be happy to share science ideas, suggestions, and processing efforts.

FTP site format

The format of the ftp site should be fairly self explanatory.   We are only starting to put data up so the site will chane and expand.   Currently, the top level directory looks like:

Index of ftp://rivet@ftp.iod.ucsd.edu/

Up to higher level directory

Name Size Last Modified
drifter 8/29/12 8:35:00 PM
fluorometers 9/4/12 6:27:00 PM
wirewalker 9/4/12 8:54:00 PM

The fluorometer directory contains all the data from the deployed fluorometers in two sub directories  fixed_fluorometers (mounted on pipes near current meters) and towed_fluorometers (towed behind a boat).

Index of ftp://rivet@ftp.iod.ucsd.edu/fluorometers/

Up to higher level directory

Name Size Last Modified
File:SIO_fluorometer_data_report.pdf 746 KB 9/4/12 6:27:00 PM
fixed_fluorometers 8/29/12 8:34:00 PM
towed_fluorometers 9/3/12 11:27:00 PM

Let me know if you have any questions

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Results from both WireWalkers : both deployments

All the Wirewalker data has now been processed.   Below are plots for WW1 deployment 2 and WW2 deployments 1 & 2.   Note in the plots below that the dark cross-hatched areas are times when the WW data is bad.   See the previous post for the map of the WW locations.

WW1 Deployment 2

WireWalker 2, deployment 1

WW2 deployment 1 (30 Apr to 10 May). Same format as above figure

WireWalker 2, deployment 2

WireWalker 2 Deployment 2 (10 May -21 May) in the same format as the above figures.

 

 

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WireWalker #1 Deployment 1 results

We now have our first look at the wirewalker (WW) mooring observations.   The wirewalkers use the up and down motion of the sea-surface to move a CTD+fluorometer profiling package up and down the water column.   As such, good vertical and tempral resolution of the watercolumn can be acheived with a single sensor.    During RIVET-I, we deployed 2 WW in appoximately 8 m depth.  WW1 was deployed just offshore of the “new” channel at approximate locations (x,y) = (1000,0) m.    See the legend of the figure below summarizing instrument locations.

Map of New Rivet Inlet NC bathymetry (from the ASACE FRF) in the RIVET coordinate system with the SIO (Feddersen/Guza) and WHOI (Raubenheimer/Elgar) ADV, ADCP, and wirewalker (WW) instrument locations as noted in the legend. The TopSail side of the inlet is below and the Camp Lejuene side is on top. SIO ADV locations are marked V1-V8. All locations also had a co-located pressure sensor Map of New Rivet Inlet NC bathymetry (from the ASACE FRF) in the RIVET coordinate system and many locations also had a co-located Rhodamine WT dye fluorometer. Dye was released either near x ≈ −600 m and y ≈ −300 m, or about 1.2 km further up the inlet towards the Inter-Coastal Waterway.

Each WW as deployed twice for ~11 days.    Below is the results of the 1st deployment of WW1.    A semi-diurnal temperature signal is evident over the 11 days as inlet water comes out the New River Inlet on ebb tide.   Typically a salinity signal is associated as well.

Wirewalker #1 Deployment #1 data from 0000 1 May and spanning 1-6 m in the watercolumn. Gridded are temperature (top), salinity (middle), and Rhodamine WT dye (log10 – bottom).

Dye was released on May 6, 7, 8th (note this is equivalent to time 5, 6, 7) on the plot above as the xaxis is days from 0000 1 May.   Note also data collection had begun on Apr 30th (day = -1).     For each of the dye releases there is a clear dye signal at WW!.  For the 1st two releases, the dye passes the WW relatively quickly and appears to be well mixed consistent with the temperature and salinity.    However, on the 3rd release, the resulting dye signal is more complex.    The dye first passes at t=7.7, and superficially does not appear to be well mixed.   However, approximately 12 hours later, dye is again present at WW1.   This indicates that dye had been recirculated back into the inlet on the flood tide and ejected again on the subsequent ebb.    There is another weaker dye signal on the next semi-diurnal cycle as well.

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Airborne Dye Movie from May 11th 2012

Animation of “dye” concentration from New River Inlet on May 11th 2012. Dye concentration is derived by differencing measured light at two wavelengths and is indicated by the black color. Dye is released in a single bomb up the inlet ~500 m from the junction with the inter-coastal waterwaterway (ICW). It propagates downstreamon the ebb tide. Unlike previous releases, the dye spreads across the entire channel and exits both the old and new channels. However, the tide switches to flood and sucks back the dye that was leaving the old channel.

For other information on this dye relase day go  here and here.

The .mov file (which is much more crisp than the youtube video) can be downloaded here.

 

 

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Airborne Dye Movie from May 8th

We’ve also gotten the May 8th dye movie put together. Check out the youtube video or the link to the .mov file below.

The dye qualitatively behaves similar to on May 7th (see previous post). However, the dye does not get advected as far downcoast.   However, there are a number of coherent structures clearly visible in the dye field.    The most dramatic are perhaps the eddies spinning off of the jet escaping out the small channel to the SW of the inlet.  See frame at time 1711 at x=250m and y=-800m (approx).

Link to the .mov file is found here

 

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