The southern sections (figure 4.2) show almost unstratified salinities increasing from east to
west. Only at sections 58 to 60°N (figures 4.4. and 4.5) low salinity waters were focused on
the eastern mixed layer with deeper waters reflecting the increasing influence of the Atlantic
to the north.
Survey period Cruise ID
24.06.1998 — 16.07.1998 Gauss 317 T
02.07.1999 — 22.07.1999 Gauss 335
Gauss 353
Gauss 370 _
._ 16.07.2002 — 31.07.2002 Gauss 385 -
28.07.2003 — 13.08.2003 Gauss 405
05.08.2004 — 20.08.2004 Gauss 425
10.08.2005 — 29.08.2005 Gauss 446
02.08.2006 — 20.08.2006 Gauss 463
03.08.2007 — 17.08.2007 Pelagia 273
21.07.2008 — 05.08.2008 Pelagia 293
20.08.2009 — 09.09.2009 Pelagia 311
04.08.2010 — 22.08.2010 Pelagia 323__
08.08.2011 — 28.08.2011. 109__
07.08.2012 — 30.08.2012 Cr120,
Ch
Ca.
CE15u1-
CE16011
CE 701° __
CE18:
26.08.2019 — 17.09.2019 C-1: —_
c A
_02.07 a
Table 2: Survey periods (grey coloured boxes) and temporal placement of reference period
(red box; 2002 is excluded) for NSSS since 1998. The survey periods of 2019, 2020 and
2021 are coloured green, blue and red according to the coloured lines in Figure 2. The „X“
mark the seasonal SST maxima from the 7 day averages (Wednesday to Tuesday) based on
the SST maps from BSH ?.
A
f
3.0
0
4.0
2.0
0.0
—{948-2017
— 2018
— 2019
— 2020
Weekly North Sea 557 1998 - 2020
—1995.2018
18.0 — 7019
— 2020
16.0 + — 7021
OL
‚z
-
12.0
kb
N |
% 40.0
14.0
Weekly North Sea SST 1998 - 2021
Jr
9 11.13.16 17 19.21 23.25 27 29 1 35 37 39 41 43 45 47 49 61 53
week (Wednesday - Tuesdavl
A.
AA
|4 43 15 17 49 21 23 26 27 29 31 33 36 37 39 41 43 45 47T 80 52
week (Wadnesday - Tuesday)
Figure 2: Seasonal signal of SST in the North Sea, based on weekly mean of the BSH
merged product from ship observations and NOAA satellite, (left) red line for 2020, (right) red
line for 2021. The red boxes mark the time span of the NSSS in 2020 (left) and 2021 (right).
1}
https://www.bsh.de/DE/DA TEN/Meerestemperaturen/Meeresoberflaechentemperaturen/
meeresoberflaechentemperaturen_node.html
17
