Cruise Report, RV ATAIR, Cruise 0671021-1, Bremerhaven - Thyboron - Aberdeen, 18 Jul —- 10 Aug 2023 | 
27 
known during the satellites' fiyover. For this purpose, the phytoplankton was collected and its 
taxonomic composition determined in the home laboratory. 
During cruise 067/021-1, water samples were taken at daylight stations with the purpose to 
determine the phytoplankton content in the surface layer of the North Sea, see Figure 5.9. The 
stations selected were consistent with those for Secchi depth observations and water sampling 
for chlorophyll-a analysis. For phytoplankton, 1 litre of seawater was taken from the Niskin 
bottles closed at 2.5 m, 5 m, 7.5m and 10 m and placed in a glass bottle after rinsing the bottle 
three times with seawater. The resulting sample to be analysed was treated as a mixed sample 
from all four sampling levels plus a bucket sample taken directly at the sea surface. 200 ml of 
this sample was transferred to a smaller glass bottle using a graduated cylinder. Using a pi- 
pette, 2 ml of acidic Lugol’s solution was added to the water sample in order to fix and preserve 
the phytoplankton samples during the field work. The glass jar was then sealed using a flexible 
narafılm and stored in the dark. 
41°N 
» 
5NOS2S Grup rn 
> 
> — GNO0S24 
Phytoplankton 
Sampling ff 
39°? -— 
„ANAST 
NOA4B 
NO 
GN 
“040. 
BP GNO40 
| 
37° 
„A 
+ 
Grm 
em 
> 
3NO27 
ANOa7A” 
+ 4% 
Br 
anf? 
GN 
» 
18 
nen 
a 
1 O 
MO2 Kar 
BF 
VF 
SS 
RV Atair 
Zruise 0671021-1 
18 Jul - 10 Aug 2023 
Yramarhavan-Thyhnran-Abaerrrdiean 
51° — 
8°W 6° 
A° 
Je 
no 
7° 
A° 
6° 
Q° 
a UT 
AS 
Figure 5.9. Distribution of stations carried out during cruise 0671021-1 with phytoplankton sampling (red 
Aots)