4 
Cruise Report, RV ATAIR, Cruise 0671021-1, Bremerhaven - Thyboron —- Aberdeen, 18 Jul - 10 Aug 2023 
salinometer samples was partly done already during the cruise. For standardisation, /APSO 
standard seawater batches P-161 and P-167 were used. All samples were assigned a BSH 
sample Identification number similar to a Bedford number. 
Water Sampling with respect to Dissolved Ox 
‘gan 
“nn 
N - 
GNO0S3 GN0525 GNO62 
GNS 
Oxygen 
Sampling 
59° — 
7° A 
“ 
| 
. 
+4 
Ali: 
:N0425 
GN” 
F ws 
INO445 
RR 
GND: 
NDS 
„38 
3ND35S GND36 GNO36A 
Na 
„Ad 
> 
w038/ 
GNDa> 7 
GNma 
GNO®a -GNO®° 
3NO7RS‘ GN028 '- GNO27 GNO26A 
9 
4026 
X 
10256. 
3N019S GNO?21 
- 
Zur 
GNO22 3N023 u 
— {m I D, Ga CN 
GNO21/AWZW2 GNO22A | en024B0 4 
E 
ze 
Sz 
GNON3» GNONMELBE 
AMANAsS 
GNOSR 
GN007A 
RV Atair 
Zruise 0671021-1 
18 Jul - 10 Aug 2023 
Bremerhaven-Thvboron-Aberdeen 
51° 4 — 
8°W 6° 
A‘ 
ha 
n° 
‘ 
Ro 
"nf — 
Ro 
10° 12°E 
Figure 5.1. Distribution of stations carried out during cruise 0671021-1 with oxygen sampling (red dots). 
Throughout cruise 067/021-1, water samples were taken for the pupose of estimating the 
concentration of dissolved oxygen in seawater. Oxygen sampling stations are highlighted in 
Figure 5.1. Water samples were analysed already during the cruise through photometric 
methdods using a Dissolved Oxygen Analyzer (DOA) system. Procedures followed those 
described in BSH (2021). The dissolved oxygen in seawater is determined using the Winkler 
method modified by Carpenter (1965). The physically dissolved oxygen reacts in an alkaline 
medium with manganese(ll) hydroxide to form higher manganese salts (manganese(Ill) 
hydroxide, manganese(IV) hydroxide). After fixing the oxygen and allowing the precipitate to