| Plattform Platform |
Reise-Nr. Cruise-No. |
Zeitraum Period |
Projekt Project |
Arbeitsgebiet Working area |
|---|---|---|---|---|
| Alkor | AL400 | 04.09.2012 - 20.09.2012 | Baltic Sea Gotland Basin |
| Fahrtleiter Chief Scientist | Institut Institute | Auslaufhafen Port of departure | Einlaufhafen Port of return | Stationskarte Station map | Schiffsroute Trackchart |
|---|---|---|---|---|---|
| Umlauf Lars | Leibniz-Institut fur Ostseeforschung, Warnemunde | Rostock | Rostock | Karte Map |
Ziel der Reise / Objectives of Cruise:
This cruise aimed at understanding the impact of lateral intrusions and turbulent mixing on bio-geochemical and microbial processes inside the redoxcline of the central Baltic Sea. Study areas were located in the Gotland Basin (Area 1) and in the vicinity of the Landsort Deep (Area 2, see attached chart). Measurements at both sites included data from a towed (ScanFish) CTD System that allowed us to detect the signatures of intrusions during several basin-scale transects. Intrusions of cold and oxygen-rich waters were found to be ubiquitous features in the Gotland Basin, whereas in the Landsort Deep there was no evidence for their existence. Focusing on a few particularly strong intrusions (Gotland Basin) and turbidity hot-spots below the redoxcline (Landsort Deep), traditional CTD casts were used to optain water samples with high vertical resolution for the chemical and microbiological analyses. These included nutrient analysis (oxygen, nitrate, nitrite, ammonium) and microbiological activity and CARD-FISH measurements. Mixing parameters were estimated from more than 500 cats with a turbulence microstructure profiler on both fixed stations an 5-10 nm cross-slope transects. At several slope locations short-term moorings (ADCCPs, CTD-chains) were deployed in order to obtain a temporally resolved picture of the lowest ~50 m of the water column (see attached track chart).
Messungen / Measurements
| Institut Institute |
Wissenschaftler Scientist |
Anzahl Number |
Einheit Unit |
Typ der Messungen Type of measurements |
Kommentar Comments |
Daten im DOD Data in DOD |
|---|---|---|---|---|---|---|
| IOW | Umlauf Lars | 12 | day(s) | D71 Current profiler (e.g. ADCP) |
Permanent current profiling of upper ~60 m with vessel-mounted 300 kHz ADCP. | no |
| IOW | Umlauf Lars | 7 | profiles | D90 Other physical oceanographic measurements |
Basin-scale surveys with ScanFish (towed undulating CTD system) on ~50 nm long transects.. | no |
| IOW | Umlauf Lars | 575 | diving(s) | D90 Other physical oceanographic measurements |
Casts with turbulence microstructure profiler (T/C, turbidity, O2, micro-scale shear). | no |
| IOW | Umlauf Lars | 36 | stations | H00 Stations |
- | yes |
| IOW | Jurgens Klaus | 21 | stations | H10 CTD-Stations |
CTD stations (T/C/O2/turbidity/fluorescence), chemical + microbiological samples. | no |
| IOW | Umlauf Lars | 21 | stations | H10 CTD-Stations |
CTD stations (T/C/O2/turbidity/fluorescence), chemical + microbiological samples. | no |
| IOW | Umlauf Lars | 7 | profiles | H11 Sub-surface measurements underway (T, S) |
Basin-scale surveys with ScanFish (towed undulating CTD system) on ~50 nm long transects.. | no |
| IOW | Jurgens Klaus | 21 | stations | H21 Oxygen |
CTD stations (T/C/O2/turbidity/fluorescence), chemical + microbiological samples. | no |
| IOW | Umlauf Lars | 21 | stations | H21 Oxygen |
CTD stations (T/C/O2/turbidity/fluorescence), chemical + microbiological samples. | no |
Verankerungen / Moorings
| Institut Institute |
Wissenschaftler Scientist |
Typ der Messungen Type of measurements |
Kommentar Comments |
geogr.Breite Latitude |
geogr.Länge Longitude |
Daten im DOD Data in DOD |
|---|---|---|---|---|---|---|
| IOW | Umlauf Lars | D71 | Exchange of long-term mooring with ADCP and several CTD loggers | 57° 22.0' N | 20° 20.5' E | no |
| IOW | Umlauf Lars | D71 | Short-term (several days) deployment of CTD-chain with bottom-mounted 600 kHz ADCP | 57° 23.0' N | 19° 40.8' E | no |
| IOW | Umlauf Lars | D71 | Short-term (several days) deployment of CTD-chain with bottom-mounted 600 kHz ADCP | 58° 18.6' N | 18° 28.4' E | no |
| IOW | Umlauf Lars | D71 | Short-term (several days) deployment of bottom-mounted 300 kHz ADCP | 57° 23.1' N | 19° 40.8' E | no |
| IOW | Umlauf Lars | D71 | Short-term (several days) deployment of bottom-mounted 300 kHz ADCP | 58° 18.6' N | 18° 28.1' E | no |
| IOW | Umlauf Lars | D71 | Short-term (several days) deployment of bottom-mounted 600 kHz ADCP | 57° 23.1' N | 19° 34.1' E | no |
| IOW | Umlauf Lars | H72 | Exchange of long-term mooring with ADCP and several CTD loggers | 57° 22.0' N | 20° 20.5' E | no |
| IOW | Umlauf Lars | H72 | Short-term (several days) deployment of CTD-chain with bottom-mounted 600 kHz ADCP | 57° 23.0' N | 19° 40.8' E | no |
| IOW | Umlauf Lars | H72 | Short-term (several days) deployment of CTD-chain with bottom-mounted 600 kHz ADCP | 58° 18.6' N | 18° 28.4' E | no |
