26 | Cruise Report, RV ATAIR, Cruise 0671021-1, Bremerhaven - Thyboron —- Aberdeen, 18 Jul - 10 Aug 2023 
MY 
“"953D 
PP 
Chlorophyll-a 
Sampling { 
39° 
fc 
55° 
KO 
SPS 
GNS 
GNO2 © GNA“- 
-_ _... GNO37A 
-—.0-0 
-  GNO37 = 
3 
aN09? 
N040 
Ir SNO040L 
La 
Gnbaä 
a 
> 
38 
3N026A 
N 
N 
on 
a — 
RV Atair 
Cruise 0671021-1 
18 Jul - 10 Aug 2023 
Sremerhaven-Thyboron-Aberdeen 
51° A 1 
8°W 6° 
4° 
Bf 
no 
zn 
mc 
Ro 
Ro 
40° 12°E 
Figure 5.8. Distribution of stations carried out during cruise 0671021-1 with water sampling and subse- 
quent filtration for chlorophyll-a determination (red dots). 
The chlorophyll-a concentrations measured in the laboratory serve 1) as a rough measure of 
ohytoplankton biomass and 2) are used for comparison with the chlorophyll-a concentrations 
determined by remote sensing (ground truthing). 
Phytoplankton Sampling 
Understanding the distribution and behaviour of plankton is key to deciphering the complex 
dynamics of marine ecosystems. The assimilation of satellite data bridges the gap between 
observation and theory. The EnsAD project aims to improve real-time forecasting capabilities 
for potentially problematic phytoplankton groups by integrating hyperspectral remote sensing 
data from the ENMAP and PACE satellites into biogeochemical models for the North Sea and 
Baltic Sea. In order to adapt the algorithms, the composition of the phytoplankton must be