| Plattform Platform |
Reise-Nr. Cruise-No. |
Zeitraum Period |
Projekt Project |
Arbeitsgebiet Working area |
|---|---|---|---|---|
| Sonne | SO298 | 14.04.2023 - 02.06.2023 | GEOTRACES |
Pacific 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 (Eastshore campus) (GEOMAR) | Guayaquil | Townsville |
Ziel der Reise / Objectives of Cruise:
Research cruise SO298 with FS Sonne was sailed in the period April to June 2023 in the Equatorial Pacific Ocean (EPO) from Guayaquil (Ecuador) to Townsville (Australia), with a focus on trace element biogeochemistry and chemical oceanography but also including physical and biological oceanographic components. The research topic of the cruise was to determine in detail the distributions, sources and sinks of trace elements and their isotopes (TEIs) in the water column along a zonal section in one of the biogeochemically least studied ocean regions on earth. We aimed to investigate the biogeochemical cycling of TEIs, and their interactions with surface ocean productivity and the carbon and nitrogen cycles (incl. N2 fixation), given that some TEIs act as micronutrients. The findings will have global significance for understanding the chemical environment in which ecosystems operate. The supply pathways of TEIs to the EPO from ocean boundaries including the atmosphere (dust and rain), continents (mainly Asian rivers), sediments (on continental shelves/slopes of the Indonesian Island Arcs), and ocean crust (hydrothermalism) were investigated. The TEI transport within water masses was determined with a focus on the equatorial eastward flow of Asian shelf derived TEIs in the Equatorial Undercurrent but also the deep inflow of Southern Ocean waters in the western EPO. The TEI transport assessment along the cruise track will also allow a more reliable use of particular TEIs as paleo circulation proxies. The cruise is officially be part of the international GEOTRACES program.
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 | Achterberg Eric | 20 | stations | B02 Phytoplankton pigments (e.g. chlorophyll, fluorescence) |
phytoplankton pigments | no |
| GEOMAH | Achterberg Eric | 42 | stations | B06 Dissolved organic matter (e.g. DOC) |
dissolved organic carbon (GFF filtered) | no |
| GEOMAH | Achterberg Eric | 12 | stations | B71 Particulate organic matter (e.g. POC, PON) |
Particulate organic matter | no |
| GEOMAH | Achterberg Eric | 15000 | km | D03 Currents measured from ship drift |
Shipboard ADCP data 75 kHz and 38 kHz | no |
| BRIRE | Briese Schifffahrts GmbH & Co. WTD | 1 | n miles | D71 Current profiler (e.g. ADCP) |
VMADCP 38+75 kHz | yes |
| GEOMAH | Achterberg Eric | 15000 | km | G74 Multi-beam echosounding |
multibeam echosounding with EM122 | no |
| BRIRE | Briese Schifffahrts GmbH & Co. WTD | 1 | n miles | G90 Other geological or geophysical measurements |
EM122 | yes |
| GEOMAH | Achterberg Eric | 40 | stations | H00 Stations |
- | yes |
| GEOMAH | Achterberg Eric | 42 | stations | H10 CTD-Stations |
Stainless steel frame CTD casts with T, S, turbidity, Oxygen, fluorescence, turbidity | no |
| GEOMAH | Achterberg Eric | 42 | stations | H10 CTD-Stations |
Titanium CTD casts with parameters T, S, turbidity, diss. Oxygen, transmissometer | no |
| GEOMAH | Achterberg Eric | 42 | stations | H22 Phosphates |
phosphate in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H23 Total - P |
TDP in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H24 Nitrates |
nitrate in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H25 Nitrites |
nitrite in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H26 Silicates |
silicic acid in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H27 Alkalinity |
Alkalinity in water | no |
| JUBR | Koschinsky Andrea | 12 | stations | H30 Trace elements |
trace element speciation for Fe, Cu and Zn, and size fractionation in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H30 Trace elements |
trace elements (transition elements) in water | no |
| GEOMAH | Frank Martin | 42 | stations | H30 Trace elements |
Rare earths elements in water | no |
| GEOMAH | Frank Martin | 12 | stations | H32 Isotopes |
Isotopes for Ba and Si in water | no |
| GEOMAH | Achterberg Eric | 15000 | km | H71 Surface measurements underway (T, S) |
Thermosalinograph | no |
| GEOMAH | Achterberg Eric | 42 | stations | H73 Geochemical tracers (e.g. freons) |
Water samples for salinity and oxygen, helium, radium, thorium | no |
| GEOMAH | Achterberg Eric | 42 | stations | H75 Total-N |
TN in water | no |
| GEOMAH | Achterberg Eric | 42 | stations | H76 Ammonia |
ammonium in water | no |
| BRIRE | Briese Schifffahrts GmbH & Co. WTD | 1 | n miles | H80 Other physical measurements |
Underway measurements udring the whole trip such as coordinates, depth, meteorological parameter and so on | yes |