Offshore
Methods
CTD deployed, then used the descent to note approximate depth of thermocline to determine the number and location where bottles should be fired on way back up.
Deployed plankton net at 3 stations sampling between set depths. Recovered to deck and washed to produce a sample.
To fix dissolved oxygen samples manganous chloride and alkaline iodide solution were added.
Zooplankton samples collected. Zooplankton samples fixed with 10% formaldehyde solution.
Chlorophyll samples were obtained. The water was filtered and filters submerged in 90% acetone.
Nutrient samples were taken with Niskin Bottles at depth.
|
Station number |
Latitude (DMS) |
Longitude (DMS) |
Comments |
|
C22 |
050° 11.523' N |
004° 15.065' W |
UTC 10:46, sunny, 0/8 cloud cover |
|
C23 |
050° 13.610' N |
004° 13.226' W |
UTC 12:10, sunny, 1/8 cloud cover, filter fell off of C22 |
|
C24 |
050° 15.412' N |
004° 12.336' W |
UTC 13:02, sunny, 1/8 cloud cover |
|
C25 |
050° 18.252' N |
004° 09.756' W |
UTC 14:14, sunny, cloud cover 1/8 |
|
C26 |
050° 19.6024' N |
004° 10.933' W |
UTC 14:45, sunny, 1/8 cloud cover |
|
C27 |
050° 18.582' N |
004° 07.560' W |
UTC 15:10, sunny, cloud cover 1/8 |
Goal
Our group travelled out to Eddystone on the 06/07/18 at 08:00 BST. The key aim
of our offshore excursion was to identify the stratified and mixing zones, and ultimately
the front, between Plymouth Sound and Eddystone Lighthouse. To do this, a number
of parameters were measured using a CTD. These included temperature and salinity,
as well fluorescence, beam transmission, dissolved oxygen, nutrients and phyto/zooplankton
abundances which were measured with nets at C22, C23, and C24. Photosynthetic Active
Radiation (PAR) was also measured. Analysis of the interrelationship between the
physical and biological parameters was critical in helping identify these zones.
Figure 1a - Google Earth image with pin markers displaying sample sites.
Table1 - Sample site information