Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Heincke	HE431	18.08.2014 - 08.09.2014		North Sea Baltic Sea North Atlantic Ocean

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
John Uwe	Alfred-Wegener-Institut fur Polar- und Meeresforschung	Bremerhaven	Bremerhaven

Ziel der Reise / Objectives of Cruise:

The research cruise HE431 started at the 18.08.2014 at 8:00h in Bremerhaven. We expierenced harsch weather conditions and had to continue with reduced speed (3-4 kn). The cruise duration was 20 days and one hour with an distance of 1170 sm. We reached Bremerhaven at the 08.09.2014 at 8:00h. The overarching aim of this cruise was to study the population of toxigenic dinoflagellates, which could only partielly succeed due to the late cruise timing and therefore many of the target species where not abundant in the water column anymore or even already gone. We sampled for phytoplankton using a plankton net and the water roseet sampler, and we sampled for nutrients, dissolved organic material and phytotoxins. Beside the study of the water column we have investigated the sediment for potential resting cyst-stages of the dinoflagellates. Lofoten: At the 23.08.2014 we reached the first sample station. The salinity at the surface was around 33.8 and up to 35 in deeper water. The surface water of the first five stations was between 9.5 and 11?C and slightly higher at the entrance of the fjord (station 6). In the depth the temperatures was at 7?C. We measured PSP toxins in the collected cell pellets. The most abundant phytoplankton species were Ceratium, Chaetocerus, Pseudo-Nitzschia and few Dinophysis and Alexandrium. Nordfjord: The Nordfjord (28.08-29.08.2014 ) was up to 1000m deep and showed a clear layer in the water column. At the entrance of the fjord the layer was not as clear. A salinity of 31.8 (surface) to 34.8 (depth) was observed. Likewise there was clear layer visible in the temperature profile. At the fjords entrance a temperature of 14.4?C was observed (surface), from 20m down to a temperature under 10?C and down to 8?C (30m), without a decline afterwards. In the fjord a surface temperature of 16?C was observed, at 16m temperature under 10?C and down to 8?C from 35m depth. Again Ceratium species, but also Pseudonitzschia and its toxins were prominent. Sognefjord: The Sognefjord was more than 1200m deep and belongs to the deepest and largest Fjords in Europe. The fjord showed similar layering as the Nordfjord, with a higher salinity and lower temperature at the outer station. At the outer station of the fjord a salinity of 30.8 (15.6?C) was observed and from a depth of 47m the temperature declined noticeable to under 10?C (salinity 34.6). In the fjord the surface temperature was higher than 16?C and declined from 38m to 10?C. With going into the fjord this border shifted to 17m. At the surface a salinity of 22 was observed, increased rapid to 30 (around 8m) and showed a salinity of 35 in the depth. The Plankton community was similar to the Nordfjord but more abundant. At the 01.09.2014 we entred the habor of Bergen and exchanged scientists. Stavanger Fjord: At the 2-3.09.2014 we sampled the watercolumn around Stavanger. The water column around the Stavanger area did not show a clear layering. Two stations at the coast were 80 to 140m deep and the stations in the fjord showed depth from 360 (station 26) to 500m (station 25). The surface temperature was around 17?C and at 100m temperatures over 10?C were observed. Here we found a relative homogenous phytoplankton assembly with few dominat species such as Ceratium and Protoperidinium. Swedish Fjordsystem: The Sweden transect was sampled at the 5th and sixth of September. The sample area included several connected fjords. The deepest depth observed was 30.7m at station 31. The temperatures at the surface were around 18?C and only declined under 10?C at station 31. A salinity of 20 to 22 was observed and increased with higher depth. The Phytoplankton diversity was high and the total biomass much larger compared to the other study areas. We found several potential toxigenic species and fishing was closed by the local authorities due to occurrence of phytotoxins in the watercolumn

Messungen / Measurements