Department of Estuarine and Ocean Sciences Seminar
When: Wednesday,
October 28, 2015
12:30 PM
-
1:30 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
Seminar Announcement
Observations of Dye Dispersion in the Seasonal Pycnocline
Miles A. Sundermeyer
Department of Estuarine and Ocean Sciences
School for Marine Science and Technology
UMass Dartmouth
Wednesday, October 28, 2015
12:30 pm - 1:30 pm
SMAST I, Room 204
706 S. Rodney French Blvd., New Bedford, MA
Abstract:
Dye release experiments conducted in the seasonal pycnocline of the Sargasso Sea were used to estimate diapycnal and isopycnal diffusivities on time scales of many days, and spatial scales of 0.1 to 10 km. Analysis of dye distributions using a shear-strain-diffusion model suggests vertical shear dispersion by low frequency shears and internal waves explain a fraction of the observed lateral spreading. However, higher resolution observations in both time and space are needed to better understand what other processes are driving the
observed dispersion. A series of shorter (~6 hrs) experiments surveyed using airborne Light Detection and Ranging (LIDAR) reveal details about the short-term evolution of the dye patches, including multiple instances
of sinuous meanders of the patches early in the evolution, and/or evidence of filamentation along their periphery. This suggests weak small-scale (<1 km) differential lateral advection acting on the patches, possibly contributing to
enhanced dispersion at later times in the longer experiments. Simple scaling implies an upper bound on the effective lateral diffusivity at the <1 km scale that is nearly an order of magnitude smaller than that at 1-5 km scales. These results suggest that significant insight can be gained using airborne remote sensing techniques in concert with traditional ship-based methods.
Note: Seminar will be simulcast to SMAST II, Room 325.
You can view the seminar live by clicking
here: "live event" . Please note: the earliest you will be able to log in is 15 minutes before the regularly scheduled time.
To view a video of an SMAST seminar (post-October 1st), go to
http://www.umassd.edu/smast/newsandevents/seminarseries/
and click on a highlighted title.
For additional information, please contact Sue Silva at s1silva@umassd.edu.
Department of Estuarine and Ocean Sciences
Seminar Announcement
Observations of Dye Dispersion in the Seasonal Pycnocline
Miles A. Sundermeyer
Department of Estuarine and Ocean Sciences
School for Marine Science and Technology
UMass Dartmouth
Wednesday, October 28, 2015
12:30 pm - 1:30 pm
SMAST I, Room 204
706 S. Rodney French Blvd., New Bedford, MA
Abstract:
Dye release experiments conducted in the seasonal pycnocline of the Sargasso Sea were used to estimate diapycnal and isopycnal diffusivities on time scales of many days, and spatial scales of 0.1 to 10 km. Analysis of dye distributions using a shear-strain-diffusion model suggests vertical shear dispersion by low frequency shears and internal waves explain a fraction of the observed lateral spreading. However, higher resolution observations in both time and space are needed to better understand what other processes are driving the
observed dispersion. A series of shorter (~6 hrs) experiments surveyed using airborne Light Detection and Ranging (LIDAR) reveal details about the short-term evolution of the dye patches, including multiple instances
of sinuous meanders of the patches early in the evolution, and/or evidence of filamentation along their periphery. This suggests weak small-scale (<1 km) differential lateral advection acting on the patches, possibly contributing to
enhanced dispersion at later times in the longer experiments. Simple scaling implies an upper bound on the effective lateral diffusivity at the <1 km scale that is nearly an order of magnitude smaller than that at 1-5 km scales. These results suggest that significant insight can be gained using airborne remote sensing techniques in concert with traditional ship-based methods.
Note: Seminar will be simulcast to SMAST II, Room 325.
You can view the seminar live by clicking
here: "live event" . Please note: the earliest you will be able to log in is 15 minutes before the regularly scheduled time.
To view a video of an SMAST seminar (post-October 1st), go to
http://www.umassd.edu/smast/newsandevents/seminarseries/
and click on a highlighted title.
For additional information, please contact Sue Silva at s1silva@umassd.edu.
Contact: > See Description for contact information
Topical Areas: University Community