| Plattform Platform |
Reise-Nr. Cruise-No. |
Zeitraum Period |
Projekt Project |
Arbeitsgebiet Working area |
|---|---|---|---|---|
| Meteor | M176-2 | 01.09.2021 - 06.10.2021 | GEOTRACES |
Atlantic Ocean North Atlantic Ocean |
| Fahrtleiter Chief Scientist | Institut Institute | Auslaufhafen Port of departure | Einlaufhafen Port of return | Stationskarte Station map | Schiffsroute Trackchart |
|---|---|---|---|---|---|
| Achterberg Eric | Helmholtz Centre for Ocean Research Kiel (GEOMAR) | Emden | Emden |
Ziel der Reise / Objectives of Cruise:
The cruise M176/2 is part of the International GEOTRACES Programme. The overall aim of cruise M176/2 is to conduct a detailed geochemical sampling of the hydrothermal plume at the Rainbow vent field located at 36?13.80 N, 33?54.14 W on the Mid-Atlantic Ridge (MAR). The deep ocean work will be complimented by biological surface ocean investigations of productivity and diazotrophy. The project will obtain a mechanistic and quantitative understanding of processes that set hydrothermal fluxes of trace elements and their isotopes (TEIs) to the deep ocean interior at MAR. This work will quantify TEIs fluxes from the ocean crust and determine their biogeochemical cycling and the plume spread in relationship to large scale ocean circulation in the N Atlantic in the vicinity of MAR. We will conduct detailed water column surveys in close vicinity to the vent field and up to 60 km distance to determine the fate of hydrothermally derived TEIs with increasing distance from the source, including an assessment of changes in physical and chemical speciation. We will assess to what extent TEIs are controlled by vent supply, particle removal processes and advection. Sampling of Ra, Th and He isotopes will help to quantify hydrothermal fluxes of TEI, assess removal strength, and fingerprint sources to elucidate TEI distributions. Atmospheric and deep water (micro)nutrient supply to the surface ocean will be assessed to investigate controls on microbial ecosystem functioning, including productivity and diazotrophy. In addition, the role of dissolved organic nitrogen (DON) as a N source to phytoplankton will be assessed. The work will use GEOTRACES trace metal clean sampling and analysis approaches.
Messungen / Measurements
| Institut Institute |
Wissenschaftler Scientist |
Anzahl Number |
Einheit Unit |
Typ der Messungen Type of measurements |
Kommentar Comments |
Daten im DOD Data in DOD |
|---|---|---|---|---|---|---|
| GEOMAH | Frank Martin | 19 | stations | B02 Phytoplankton pigments (e.g. chlorophyll, fluorescence) |
phytoplankton pigments . | no |
| GEOMAH | Frank Martin | 19 | stations | B06 Dissolved organic matter (e.g. DOC) |
dissolved organic carbon (GFF filtered). | no |
| GEOMAH | Frank Martin | 19 | stations | B71 Particulate organic matter (e.g. POC, PON) |
Particulate organic matter. | no |
| GEOMAH | Achterberg Eric | 4900 | km | D03 Currents measured from ship drift |
Shipboard ADCP data 75 kHz and 38 kHz. | yes |
| GEOMAH | Steiner Zvi | 19 | stations | G04 Core-soft bottom (no. of cores) |
Multi cores MUC. | no |
| GEOMAH | Achterberg Eric | 4900 | km | G74 Multi-beam echosounding |
multibeam echosounding with EM122 (poorly functioning). | yes |
| GEOMAH | Achterberg Eric | 1 | n miles | G90 Other geological or geophysical measurements |
Parasound | yes |
| GEOMAH | Achterberg Eric | 18 | stations | H10 CTD-Stations |
Stainless steel CTD casts with parameters T, S, Chl a, turbidity, diss. Oxygen. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H10 CTD-Stations |
CTD casts with parameters T, S, turbidity, diss. Oxygen, transmissometer . | no |
| GEOMAH | Achterberg Eric | 19 | stations | H10 CTD-Stations |
Stainless steel frame CTD casts with T, S, turbidity, Oxygen, LADCP, nitrate, redox. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H22 Phosphates |
phosphate in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H23 Total - P |
TDP in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H24 Nitrates |
nitrate in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H25 Nitrites |
nitrite in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H26 Silicates |
silicic acid in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H27 Alkalinity |
Alkalinity in water. | no |
| JUBR | Koschinsky Andrea | 19 | stations | H30 Trace elements |
trace element speciation for Fe, Cu and Zn, and size fractionation in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H30 Trace elements |
trace elements (transition elements) in water, sediments. | no |
| GEOMAH | Frank Martin | 19 | stations | H30 Trace elements |
Rare earths elements in water and sediments. | no |
| GEOMAH | Frank Martin | 19 | stations | H32 Isotopes |
Isotopes for Ba in water and sediments. | no |
| GEOMAH | Achterberg Eric | 4900 | km | H71 Surface measurements underway (T, S) |
Thermosalinograph. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H73 Geochemical tracers (e.g. freons) |
Water samples for salinity and oxygen, helium, radium, thorium. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H75 Total-N |
TN in water. | no |
| GEOMAH | Achterberg Eric | 19 | stations | H76 Ammonia |
ammonium in water. | no |
| GEOMAH | Achterberg Eric | 1 | n miles | H80 Other physical measurements |
Underway measurements udring the whole trip such as coordinates, depth, meteorological parameter and so on | yes |
| GEOMAH | Achterberg Eric | 1 | meas. | M06 Routine standard measurements |
Analysen, meteorol. Daten, Satellitenbilder, Trajektorien, Wetterberichte | yes |