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  • PANGAEA  (21)
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  • 1
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    Distribution of dissolved and particulate silicon isotopes during METEOR cruise M93 (2019)
    PANGAEA
    In:  GEOMAR - Helmholtz Centre for Ocean Research Kiel
    Details
    Publication Date: 2023-10-28
    Keywords: Aluminium/Silicon ratio; Biogenic silica; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD049; CTD065; CTD076; CTD077; CTD080; CTD120; CTD122; CTD134; CTD138; CTD-RO; Date/Time of event; Depth, bottom/max; DEPTH, water; Event label; LATITUDE; LONGITUDE; M93; M93_338-1; M93_354-1; M93_367-1; M93_368-1; M93_369-4; M93_420-1; M93_422-1; M93_436-1; M93_441-4; Meteor (1986); Nitrate and Nitrite; Number; Oxygen; Profile; Ratio; SFB754; Silicate; South Pacific Ocean; Standard deviation; Station label; Δδ30Si; δ29Si; δ30Si, biogenic silica; δ30Si, error; δ30Si, silicon dissolved
    Type: Dataset
    Format: text/tab-separated-values, 1174 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Diatom assemblage of core M77/2_003-2 (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Diatom assemblage of sediment core M77/2_003-2
    Keywords: Actinocyclus curvatulus; Actinocyclus exiguus; Actinocyclus octonarius; Actinocyclus spp.; Actinoptychus senarius; Actinoptychus spp.; Actinoptychus vulgaris; Alveus marinus; Amphiascus minutus; Amphora spp.; Asteromphalus arachne; Azpeitia africana; Azpeitia nodulifera; Azpeitia tabularis; Biddulphia alternans; Biddulphia spp.; Cerataulina pelagica; Chaetoceros; Chaetoceros cinctus; Chaetoceros diadema; Chaetoceros didymus; Chaetoceros lorenzianus; Chaetoceros spp.; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cocconeis californica; Cocconeis costata; Cocconeis dirupta; Cocconeis distans; Cocconeis placentula; Cocconeis scutellum; Cocconeis spp.; Coscinodiscus asteromphalus; Coscinodiscus centralis; Coscinodiscus concinnus; Coscinodiscus radiatus; Coscinodiscus spp.; Cyclotella spp.; Cyclotella striata; Cyclotella stylorum; Cymbella pusilla; Delphineis karstenii; DEPTH, sediment/rock; diatoms; Diatoms; Diploneis spp.; Discoaster spp.; Ditylum brightwellii; Eucampia spp.; Eunotia spp.; Eunotogramma debile; Fragilariopsis doliolus; Glyphodesmis distans; Grammatophora spp.; Hemiaulus spp.; Hemidiscus cuneiformis; M77/2; M77/2_003-2; M77/2_636-1; Meteor (1986); Minidiscus chilensis; Navicula spp.; Nitzschia bicapitata; Nitzschia gandersheimiensis; Nitzschia interruptestriata; Nitzschia ovalis; Nitzschia sicula; Odontella spp.; Paralia sulcata; PC; Peru; Phytoliths; Piston corer; Plagiogramma tessalatum; Plagiogrammopsis vanheurckii; Planktonellia sol; Pleurosigma spp.; Proboscia alata; Pseudogomphonema spp.; Pseudo-nitzschia pungens; Pseudosolenia calcar-avis; Radiolarians; Rhizosolenia acicularis; Rhizosolenia acuminata; Rhizosolenia bergonii; Rhizosolenia castracanei; Rhizosolenia clevei; Rhizosolenia decipiens; Rhizosolenia hyalina; Rhizosolenia imbricata; Rhizosolenia spp.; Roperia tessellata; SFB754; Silicoflagellates; Skeletonema costatum; Sponge spiculae; Stephanopyxis spp.; Thalassionema bacillaris; Thalassionema nitzschioides; Thalassionema nitzschioides var. capitulata; Thalassionema nitzschioides var. claviformis; Thalassionema nitzschioides var. inflata; Thalassionema nitzschioides var. lanceolata; Thalassionema nitzschioides var. nitzschioides; Thalassionema nitzschioides var. parva; Thalassiosira eccentrica; Thalassiosira leptopus; Thalassiosira oestrupii; Thalassiosira pacifica; Thalassiosira spp.; Thalassiothrix longissima; Trachyneis spp.
    Type: Dataset
    Format: text/tab-separated-values, 8295 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    Dissolved gas and dissolved inorganic nitrogen concentrations isotopes during METEOR cruise M90 (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Seawater samples for stable isotopes measurements of nitrate (δ15NO3-) and nitrite (δ15NO2-) were taken from the CTD/rosette. δ15NO3- and δ15NO2- samples were either preserved frozen or an azide treatment was applied depending on the nitrite concentration (Altabet et al., 2012; Bourbonnais et al., 2015; Hu et al., 2016). The isotopic composition of both N-species was measured using the Cd reduction/azide method (McIlvin and Altabet, 2005).
    Keywords: Bottle number; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD 1; CTD 10; CTD 100; CTD 101; CTD 102; CTD 103; CTD 105; CTD 106; CTD 107; CTD 108; CTD 109; CTD 110; CTD 111; CTD 112; CTD 113; CTD 114; CTD 115; CTD 116; CTD 117; CTD 119; CTD 120; CTD 121; CTD 122; CTD 123; CTD 124; CTD 125; CTD 126; CTD 127; CTD 128; CTD 129; CTD 13; CTD 130; CTD 131; CTD 132; CTD 133; CTD 135; CTD 136; CTD 138; CTD 139; CTD 14; CTD 141; CTD 143; CTD 144; CTD 145; CTD 147; CTD 149; CTD 15; CTD 150; CTD 151; CTD 152; CTD 153; CTD 154; CTD 156; CTD 158; CTD 16; CTD 160; CTD 162; CTD 165; CTD 168; CTD 171; CTD 173; CTD 183; CTD 2; CTD 20; CTD 22; CTD 23; CTD 24; CTD 25; CTD 26; CTD 27; CTD 28; CTD 29; CTD 3; CTD 30; CTD 31; CTD 32; CTD 33; CTD 34; CTD 35; CTD 36; CTD 37; CTD 38; CTD 39; CTD 4; CTD 41; CTD 42; CTD 43; CTD 44; CTD 45; CTD 48; CTD 49; CTD 5; CTD 50; CTD 51; CTD 52; CTD 54; CTD 55; CTD 56; CTD 57; CTD 58; CTD 59; CTD 61; CTD 62; CTD 63; CTD 64; CTD 65; CTD 66; CTD 67; CTD 69; CTD 70; CTD 71; CTD 72; CTD 73; CTD 74; CTD 77; CTD 78; CTD 79; CTD 81; CTD 82; CTD 83; CTD 84; CTD 85; CTD 86; CTD 89; CTD 9; CTD 90; CTD 91; CTD 92; CTD 93; CTD 94; CTD 95; CTD 96; CTD 97; CTD 98; CTD 99; CTD-RO; DATE/TIME; DEPTH, water; Event label; LATITUDE; LONGITUDE; M90; M90_1552-1; M90_1553-1; M90_1554-1; M90_1555-1; M90_1555-2; M90_1559-1; M90_1560-1; M90_1563-1; M90_1563-2; M90_1564-1; M90_1565-1; M90_1569-1; M90_1571-1; M90_1572-1; M90_1572-2; M90_1573-1; M90_1574-1; M90_1575-1; M90_1576-1; M90_1577-1; M90_1577-2; M90_1578-1; M90_1579-1; M90_1580-1; M90_1581-1; M90_1581-2; M90_1582-1; M90_1583-1; M90_1583-2; M90_1584; M90_1586-1; M90_1587-1; M90_1588-1; M90_1589-1; M90_1590-1; M90_1593-1; M90_1594-1; M90_1595-1; M90_1596-1; M90_1596-2; M90_1598-1; M90_1599-1; M90_1600-1; M90_1600-2; M90_1601-1; M90_1602-1; M90_1604-1; M90_1604-2; M90_1605-1; M90_1606-1; M90_1607-1; M90_1608-1; M90_1608-2; M90_1610-1; M90_1611-1; M90_1612-1; M90_1612-2; M90_1613-1; M90_1614-1; M90_1617-1; M90_1618-1; M90_1619-1; M90_1621-1; M90_1621-2; M90_1622-1; M90_1623-1; M90_1624-1; M90_1625-1; M90_1628-1; M90_1628-2; M90_1629-1; M90_1630-1; M90_1631-1; M90_1632-1; M90_1633-1; M90_1634-1; M90_1635-1; M90_1636-1; M90_1637-1; M90_1638-1; M90_1639-1; M90_1639-2; M90_1640-1; M90_1642-1; M90_1643-1; M90_1644-1; M90_1645-1; M90_1646-1; M90_1646-2; M90_1647-1; M90_1648-1; M90_1649-1; M90_1650-1; M90_1651-1; M90_1652-1; M90_1652-2; M90_1654-1; M90_1655-1; M90_1656-1; M90_1656-2; M90_1657-1; M90_1658-1; M90_1659-1; M90_1659-2; M90_1660-1; M90_1661-1; M90_1661-2; M90_1662-1; M90_1663-1; M90_1664-1; M90_1664-2; M90_1666-1; M90_1666-2; M90_1668-1; M90_1668-2; M90_1670-1; M90_1672-1; M90_1673-1; M90_1673-1b; M90_1675-1; M90_1677-1; M90_1678-1; M90_1679-1; M90_1679-2; M90_1680-1; M90_1681-1; M90_1683-1; M90_1685-1; M90_1687-1; M90_1689-1; M90_1692-1; M90_1695-1; M90_1698-1; M90_1700-1; M90_1710-1; Meteor (1986); Nitrogen, biogenic; Nitrogen, biogenic, standard deviation; Nitrogen deficit; Nitrogen excess; Profile; SFB754; Standard deviation; δ15N, gas; δ15N, nitrate; δ15N, nitrite; δ15N, standard error; δ18O, nitrate; δ18O, nitrite
    Type: Dataset
    Format: text/tab-separated-values, 14903 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Dissolved gas and dissolved inorganic nitrogen concentrations and isotopes during METEOR cruise M91 (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Seawater samples for stable isotopes measurements of nitrate (δ15NO3-) and nitrite (δ15NO2-) were taken from the CTD/rosette. δ15NO3- and δ15NO2- samples were either preserved frozen or an azide treatment was applied depending on the nitrite concentration (Altabet et al., 2012; Bourbonnais et al., 2015; Hu et al., 2016). The isotopic composition of both N-species was measured using the Cd reduction/azide method (McIlvin and Altabet, 2005).
    Keywords: Bottle number; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-002; CTD-003; CTD-005; CTD-006; CTD-008; CTD-010; CTD-012; CTD-013; CTD-016; CTD-017; CTD-018; CTD-019; CTD-021; CTD-022; CTD-024; CTD-026; CTD-028; CTD-033; CTD-034; CTD-035; CTD-036; CTD-038; CTD-039; CTD-041; CTD-044; CTD-046; CTD-048; CTD-049; CTD-050; CTD-051; CTD-052; CTD-053; CTD-054; CTD-058; CTD-059; CTD-060; CTD-061; CTD-062; CTD-063; CTD-064; CTD-065; CTD-066; CTD-067; CTD-068; CTD-069; CTD-070; CTD-073; CTD-074; CTD-075; CTD-076; CTD-078; CTD-079; CTD-080; CTD-081; CTD-082; CTD-083; CTD-084; CTD-085; CTD-086; CTD-087; CTD-088; CTD-089; CTD-090; CTD-091; CTD-092; CTD-093; CTD-094; CTD-097; CTD-RO; DATE/TIME; DEPTH, water; Event label; LATITUDE; LONGITUDE; M91; M91_1713-1; M91_1713-3; M91_1715-1; M91_1715-3; M91_1717-1; M91_1719-1; M91_1721-1; M91_1721-3; M91_1724-1; M91_1724-3; M91_1725-1; M91_1725-3; M91_1727-1; M91_1727-3; M91_1729-1; M91_1731-1; M91_1733-1; M91_1736-1; M91_1736-3; M91_1737-1; M91_1737-3; M91_1739-1; M91_1739-3; M91_1741-1; M91_1744-1; M91_1746-1; M91_1748-1; M91_1749-1; M91_1750-1; M91_1751-1; M91_1751-3; M91_1752-1; M91_1752-4; M91_1754-1; M91_1755-2; M91_1755-4; M91_1756-1; M91_1757-1; M91_1758-1; M91_1759-1; M91_1760-1; M91_1761-1; M91_1762-2; M91_1763-1; M91_1764-1; M91_1764-3; M91_1765-1; M91_1766-1; M91_1766-3; M91_1767-1; M91_1768-1; M91_1768-3; M91_1769-1; M91_1770-2; M91_1770-4; M91_1771-1; M91_1772-1; M91_1773-2; M91_1773-3; M91_1774-1; M91_1774-3; M91_1775-1; M91_1775-3; M91_1776-1; M91_1776-3; M91_1777-1; M91_1777-4; M91_1778-1; Meteor (1986); Nitrogen excess; Profile; SFB754; South Pacific Ocean; δ15N, nitrate; δ15N, nitrite; δ18O, nitrate; δ18O, nitrite
    Type: Dataset
    Format: text/tab-separated-values, 3789 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 5
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    Dissolved gas and dissolved inorganic nitrogen concentrations and isotopes during METEOR cruise M92 (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Seawater samples for stable isotopes measurements of nitrate (δ15NO3-) and nitrite (δ15NO2-) were taken from the CTD/rosette. δ15NO3- and δ15NO2- samples were either preserved frozen or an azide treatment was applied depending on the nitrite concentration (Altabet et al., 2012; Bourbonnais et al., 2015; Hu et al., 2016). The isotopic composition of both N-species was measured using the Cd reduction/azide method (McIlvin and Altabet, 2005).
    Keywords: Bottle number; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-006; CTD-007; CTD-008; CTD-009; CTD-010; CTD-011; CTD-012; CTD-013; CTD-014; CTD-015; CTD-016; CTD-017; CTD-018; CTD-019; CTD-020; CTD-021; CTD-022; CTD-023; CTD-024; CTD-025; CTD-026; CTD-027; CTD-028; CTD-030; CTD-031; CTD-032; CTD-033; CTD-034; CTD-035; CTD-036; CTD-037; CTD-038; CTD-039; CTD-040; CTD-041; CTD-042; CTD-043; CTD-044; CTD-045; CTD-046; CTD-047; CTD-048; CTD-049; CTD-050; CTD-051; CTD-052; CTD-053; CTD-054; CTD-055; CTD-056; CTD-057; CTD-058; CTD-059; CTD-060; CTD-061; CTD-062; CTD-063; CTD-064; CTD-065; CTD-066; CTD-067; CTD-068; CTD-069; CTD-070; CTD-071; CTD-072; CTD-073; CTD-074; CTD-075; CTD-076; CTD-077; CTD-078; CTD-079; CTD-080; CTD-081; CTD-082; CTD-083; CTD-084; CTD-RO; DATE/TIME; DEPTH, water; Event label; LATITUDE; LONGITUDE; M92; M92_0025-1; M92_0032-1; M92_0038-1; M92_0041-1; M92_0045-1; M92_0049-1; M92_0052-1; M92_0053-1; M92_0061-1; M92_0063-1; M92_0066-1; M92_0068-1; M92_0071-1; M92_0076-1; M92_0079-1; M92_0082-1; M92_0084-1; M92_0091-1; M92_0092-1; M92_0095-1; M92_0098-1; M92_0103-1; M92_0105-1; M92_0114-1; M92_0115-1; M92_0118-1; M92_0119-1; M92_0127-1; M92_0129-1; M92_0132-1; M92_0138-1; M92_0140-1; M92_0142-1; M92_0148-1; M92_0150-1; M92_0152-1; M92_0154-1; M92_0158-1; M92_0162-1; M92_0167-1; M92_0170-1; M92_0172-1; M92_0174-1; M92_0179-1; M92_0181-1; M92_0184-1; M92_0186-1; M92_0192-1; M92_0195-1; M92_0197-1; M92_0200-1; M92_0205-1; M92_0210-1; M92_0214-1; M92_0216-1; M92_0225-1; M92_0227-1; M92_0229-1; M92_0231-1; M92_0237-1; M92_0240-1; M92_0241-1; M92_0243-1; M92_0245-1; M92_0256-1; M92_0257-1; M92_0258-1; M92_0259-1; M92_0260-1; M92_0261-1; M92_0264-1; M92_0266-1; M92_0269-1; M92_0276-1; M92_0279-1; M92_0281-1; M92_0283-1; M92_0288-1; Meteor (1986); Nitrogen, biogenic; Nitrogen, biogenic, standard deviation; Nitrogen excess; Nitrogen excess, standard deviation; Profile; SFB754; δ15N, gas; δ15N, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 7894 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 6
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    Stable nitrate, nitrite and oxygen isotopes in seawater and particulate samples during METEOR cruise M93 (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Seawater samples for dual isotopes measurements of nitrate (δ15N_NO3 and δ18_NO3) and nitrite (δ15_NO2) were taken from the CTD-rosette. The isotopic composition was measured using the denitrifier method (Casciotti et al., 2002; Sigman et al., 2001).
    Keywords: Ammonium; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD008; CTD013; CTD036; CTD045; CTD049; CTD053; CTD065; CTD069; CTD071; CTD076; CTD077; CTD080; CTD081; CTD082; CTD083; CTD120; CTD122; CTD130; CTD134; CTD138; CTD142; CTD143; CTD151; CTD157; CTD-RO; Date/Time of event; DEPTH, water; Event label; LATITUDE; LONGITUDE; M93; M93_295-2; M93_298-1; M93_303-2; M93_318-3; M93_324-1; M93_334-1; M93_338-1; M93_342-1; M93_354-1; M93_359-2; M93_361-2; M93_367-1; M93_368-1; M93_369-4; M93_376-2; M93_378-2; M93_380-3; M93_399-4; M93_411-6; M93_420-1; M93_422-1; M93_430-1; M93_436-1; M93_441-4; M93_448-5; M93_456-1; M93_463-1; M93_468-1; Meteor (1986); Nitrate; Nitrite; Nitrogen oxide; Number; Oxygen; Oxygen, dissolved; PCTD-RO; Phosphate; Profile; PumpCTD/Rosette; Sample code/label; SFB754; Silicate; South Pacific Ocean; Standard deviation; Station label; Temperature, water; δ13C, particulate organic carbon; δ15N; δ15N, nitrate; δ15N, nitrite; δ15N, particulate organic nitrogen; δ15N, standard deviation; δ18O; δ18O, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 3779 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 7
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    d30Si signatures and biogenic opal content (%) of sediment core M772_003-2 off Peru (piston corer) (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: The dataset comprises all d30Si signatures and biogenic opal content (%) of core M772_003-2 off Peru
    Keywords: AGE; biogenic opal; Climate - Biogeochemistry Interactions in the Tropical Ocean; DEPTH, sediment/rock; Diatoms, δ30Si; M77/2; M77/2_003-2; M77/2_636-1; Meteor (1986); Opal, biogenic silica; PC; Peru; Piston corer; Sample code/label; SFB754; Standard deviation; δ30Si, biogenic silica
    Type: Dataset
    Format: text/tab-separated-values, 486 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 8
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    Distribution of neodymium isotopes and concentrations during M77/3 and M77/4 (2013)
    PANGAEA
    In:  Supplement to: Grasse, Patricia; Stichel, Torben; Stumpf, Roland; Stramma, Lothar; Frank, Martin (2012): The distribution of neodymium isotopes and concentrations in the Eastern Equatorial Pacific Water mass advection versus particle exchange. Earth and Planetary Science Letters, 198-207, https://doi.org/10.1016/j.epsl.2012.07.044
    Details
    Publication Date: 2023-10-28
    Description: The radiogenic isotope composition of the Rare Earth Element (REE) neodymium (Nd) is a powerful water mass proxy for present and past ocean circulation. The processes controlling the Nd budget of the global ocean are not quantitatively understood and in particular source and sink mechanisms are still under debate. In this study we present the first full water column data set of dissolved Nd isotope compositions and Nd concentrations for the Eastern Equatorial Pacific (EEP), where one of the globally largest Oxygen Minimum Zones (OMZ) is located. This region is of particular interest for understanding the biogeochemical cycling of REEs because anoxic conditions may lead to release of REEs from the shelf, whereas high particle densities and fluxes potentially remove the REEs from the water column. Data were obtained between 11400N and 161S along a nearshore and an offshore transect. Near surface zonal current bands, such as the Equatorial Undercurrent (EUC) and the Subsurface Countercurrent (SSCC), which are supplying oxygen-rich water to the OMZ are characterized by radiogenic Nd isotope signatures (eNd=-2). Surface waters in the northernmost part of the study area are even more radiogenic (eNd = +3), most likely due to release of Nd from volcanogenic material. Deep and bottom waters at the southernmost offshore station (141S) are clearly controlled by advection of water masses with less radiogenic signatures (eNd=- 7) originating from the Southern Ocean. Towards the equator, however, the deep waters show a clear trend towards more radiogenic values of up to eNd=-2. The northernmost station located in the Panama basin shows highly radiogenic Nd isotope signatures in the entire water column, which indicates that particle scavenging, downward transport and release processes play an important role. This is supported by relatively low Nd concentrations in deep waters (3000-6000 m) in the EEP (20 pmol/kg) compared to locations in the Northern and Central Pacific (40-60 pmol/kg), which suggests enhanced removal of Nd in the EEP.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 9
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    Dissolved Si isotope composition measured in water samples during METEOR cruises M77/3 and M77/4 (2013)
    PANGAEA
    In:  Supplement to: Grasse, Patricia; Ehlert, Claudia; Frank, Martin (2013): The influence of water mass mixing on the dissolved Si isotope composition in the Eastern Equatorial Pacific. Earth and Planetary Science Letters, 380, 60-71, https://doi.org/10.1016/j.epsl.2013.07.033
    Details
    Publication Date: 2023-10-28
    Description: Silicon isotopes are a powerful tool to investigate the cycling of dissolved silicon (Si). In this study the distribution of the Si isotope composition of dissolved silicic acid (d30Si(OH)4) was analyzed in the water column of the Eastern Equatorial Pacific (EEP) where one of the globally largest Oxygen Minimum Zones (OMZs) is located. Samples were collected at 7 stations along two meridional transects from the equator to 14°S at 85°50'W and 82°00'W off the Ecuadorian and Peruvian coast. Surface waters show a large range in isotope compositions d30Si(OH)4 (+2.2 per mil to +4.4 per mil) with the highest values found at the southernmost station at 14°S. This station also revealed the most depleted silicic acid concentrations (0.2 µmol/kg), which is a function of the high degree of Si utilization by diatoms and admixture with waters from highly productive areas. Samples within the upper water column and the OMZ at oxygen concentrations below 10 µmol/kg are characterized by a large range in d30Si(OH)4, which mainly reflects advection and mixing of different water masses, even though the highly dynamic hydrographic system of the upwelling area off Peru does not allow the identification of clear Si isotope signals for distinct water masses. Therefore we cannot rule out that also dissolution processes have an influence on the d30Si(OH)4 signature in the subsurface water column. Deep water masses (〉2000 m) in the study area show a mean d30Si(OH)4 of +1.2±0.2 per mil, which is in agreement with previous studies from the eastern and central Pacific. Comparison of the new deep water data of this study and previously published data from the central Pacific and Southern Ocean reveal substantially higher d30Si(OH)4 values than deep water signatures from the North Pacific. As there is no clear correlation between d30Si(OH)4 and silicic acid concentrations in the entire data set the distribution of d30Si(OH)4 signatures in deep waters of the Pacific is considered to be mainly a consequence of the mixing of several end member water masses with distinct Si isotope signatures including Lower Circumpolar Deep Water (LCDW) and North Pacific Deep Water (NPDW).
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-RO; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; M77/3; M77/3-CTD23; M77/3-CTD27; M77/4; M77/4_152; M77/4-CTD18; M77/4-CTD27; M77/4-CTD44; M77/4-CTD64; M77/4-CTD82; Meteor (1986); Nitrate; Oxygen; Phosphate; Salinity; SFB754; Silicate; Temperature, water, potential; δ30Si, silicic acid
    Type: Dataset
    Format: text/tab-separated-values, 490 data points
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  • 10
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    Age models for sediment cores M77/1-470-MUC29, M77/1-449-MUC19 and M77/1-459-MUC53 from the Peruvian shelf at 11°S (2016)
    PANGAEA
    In:  Supplement to: Ehlert, Claudia; Doering, Kristin; Wallmann, Klaus; Scholz, Florian; Sommer, Stefan; Grasse, Patricia; Geilert, Sonja; Frank, Martin (2016): Stable silicon isotope signatures of marine pore waters – Biogenic opal dissolution versus authigenic clay mineral formation. Geochimica et Cosmochimica Acta, 191, 102-117, https://doi.org/10.1016/j.gca.2016.07.022
    Details
    Publication Date: 2023-10-28
    Description: Dissolved silicon isotope compositions have been analysed for the first time in pore waters (δ30SiPW) of three short sediment cores from the Peruvian margin upwelling region with distinctly different biogenic opal content in order to investigate silicon isotope fractionation behaviour during early diagenetic turnover of biogenic opal in marine sediments. The δ30SiPW varies between +1.1‰ and +1.9‰ with the highest values occurring in the uppermost part close to the sediment–water interface. These values are of the same order or higher than the δ30Si of the biogenic opal extracted from the same sediments (+0.3‰ to +1.2‰) and of the overlying bottom waters (+1.1‰ to +1.5‰). Together with dissolved silicic acid concentrations well below biogenic opal saturation, our collective observations are consistent with the formation of authigenic alumino-silicates from the dissolving biogenic opal. Using a numerical transport-reaction model we find that approximately 24% of the dissolving biogenic opal is re-precipitated in the sediments in the form of these authigenic phases at a relatively low precipitation rate of 56 μmol Si cm−2 yr−1. The fractionation factor between the precipitates and the pore waters is estimated at −2.0‰. Dissolved and solid cation concentrations further indicate that off Peru, where biogenic opal concentrations in the sediments are high, the availability of reactive terrigenous material is the limiting factor for the formation of authigenic alumino-silicate phases.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 6 datasets
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