Dissolved organic carbon investigations from the Kara Sea
Fuente:
PANGAEA
Enregistré dans:
| Auteurs principaux: | , , , , |
|---|---|
| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2010
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1867168555112333312 |
|---|---|
| author | Köhler, Hayo Meon, B Gordeev, Viacheslav V Spitzy, Alejandro Amon, Rainer M W |
| author_facet | Köhler, Hayo Meon, B Gordeev, Viacheslav V Spitzy, Alejandro Amon, Rainer M W |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Based on observations during four scientific expeditions to the Kara Sea and the Siberian rivers Ob and Yenisei we determined the discharge, distribution and characteristics of dissolved organic matter (DOM). Surface concentrations of dissolved organic carbon (DOC) ranged from 151 IlM C in the northern Kara Sea to 939 IlM C in the river Ob. The estimated annual mean DOC concentration in the Yenisei (681 IlM C) was slightly higher than in the Ob (640 IlM C). Dissolved organic nitrogen (DON) concentrations typically varied between 5 and 15 IlM N with higher values in the rivers. Freshwater discharge and DOC concentrations experienced pronounced seasonal variations strongly affecting the spatial and temporal distribution of DOM in the Kara Sea. The largely conservative distribution of DOC and DON along the salinity gradient indicated the predominantly refractory character of riverine DOM. This observation was consistent with laboratory experiments, which showed only minor losses due to flocculation processes and bacterial consumption. Optical properties and relatively high C/N ratios (19 to 51) of DO M suggest that a large fraction of river DOM is of terrestrial origin and that phytoplankton contributed little to DOM on the Kara Sea shelf during the sampling periods. Together, the rivers Ob and Yenisei discharge about 8 Tg DOC yr- I into the Kara Sea. Due to the absence of efficient removal mechanisms in these estuaries the majority of riverine DOM appears to pass the estuarine mixing zone and is transported towards the Arctic Ocean. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_736640 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Dissolved organic carbon investigations from the Kara Sea Köhler, Hayo Meon, B Gordeev, Viacheslav V Spitzy, Alejandro Amon, Rainer M W Akademik Boris Petrov; BP00; BP00-02; BP00-03; BP00-07; BP00-08; BP00-09; BP00-15; BP00-16; BP00-17; BP00-19; BP00-20; BP00-21; BP00-22; BP00-23; BP00-24; BP00-26; BP00-27; BP00-29; BP00-30; BP00-31; BP00-35; BP00-36; BP00-38; BP00-40; BP97; BP97-01; BP97-10; BP97-12; BP97-17; BP97-18; BP97-21; BP97-24; BP97-27; BP97-30; BP97-32; BP97-34; BP97-35; BP97-40; BP97-41; BP97-42; BP97-43; BP97-46; BP97-47; BP97-48; BP97-49; BP97-50; BP97-52; BP97-55; BP97-56; BP97-58; BP99; BP99-01; BP99-02; BP99-03; BP99-06; BP99-08; BP99-10; BP99-11; BP99-12; BP99-13; BP99-15; BP99-17; BP99-18; BP99-19; BP99-20; BP99-21; BP99-24; BP99-25; BP99-26; BP99-28; BP99-29; BP99-30; BP99-31; BP99-32; BP99-35; BP99-36; BP99-37; BP99-38; BUCKET; Bucket water sampling; CTD/Rosette; CTD-RO; DIVERSE; Dredge; DRG; Kara Sea; KaraSea97; MULT; Multiple investigations; Sampling gear, diverse; Siberian River Run-Off; SIRRO Based on observations during four scientific expeditions to the Kara Sea and the Siberian rivers Ob and Yenisei we determined the discharge, distribution and characteristics of dissolved organic matter (DOM). Surface concentrations of dissolved organic carbon (DOC) ranged from 151 IlM C in the northern Kara Sea to 939 IlM C in the river Ob. The estimated annual mean DOC concentration in the Yenisei (681 IlM C) was slightly higher than in the Ob (640 IlM C). Dissolved organic nitrogen (DON) concentrations typically varied between 5 and 15 IlM N with higher values in the rivers. Freshwater discharge and DOC concentrations experienced pronounced seasonal variations strongly affecting the spatial and temporal distribution of DOM in the Kara Sea. The largely conservative distribution of DOC and DON along the salinity gradient indicated the predominantly refractory character of riverine DOM. This observation was consistent with laboratory experiments, which showed only minor losses due to flocculation processes and bacterial consumption. Optical properties and relatively high C/N ratios (19 to 51) of DO M suggest that a large fraction of river DOM is of terrestrial origin and that phytoplankton contributed little to DOM on the Kara Sea shelf during the sampling periods. Together, the rivers Ob and Yenisei discharge about 8 Tg DOC yr- I into the Kara Sea. Due to the absence of efficient removal mechanisms in these estuaries the majority of riverine DOM appears to pass the estuarine mixing zone and is transported towards the Arctic Ocean. |
| title | Dissolved organic carbon investigations from the Kara Sea |
| topic | Akademik Boris Petrov; BP00; BP00-02; BP00-03; BP00-07; BP00-08; BP00-09; BP00-15; BP00-16; BP00-17; BP00-19; BP00-20; BP00-21; BP00-22; BP00-23; BP00-24; BP00-26; BP00-27; BP00-29; BP00-30; BP00-31; BP00-35; BP00-36; BP00-38; BP00-40; BP97; BP97-01; BP97-10; BP97-12; BP97-17; BP97-18; BP97-21; BP97-24; BP97-27; BP97-30; BP97-32; BP97-34; BP97-35; BP97-40; BP97-41; BP97-42; BP97-43; BP97-46; BP97-47; BP97-48; BP97-49; BP97-50; BP97-52; BP97-55; BP97-56; BP97-58; BP99; BP99-01; BP99-02; BP99-03; BP99-06; BP99-08; BP99-10; BP99-11; BP99-12; BP99-13; BP99-15; BP99-17; BP99-18; BP99-19; BP99-20; BP99-21; BP99-24; BP99-25; BP99-26; BP99-28; BP99-29; BP99-30; BP99-31; BP99-32; BP99-35; BP99-36; BP99-37; BP99-38; BUCKET; Bucket water sampling; CTD/Rosette; CTD-RO; DIVERSE; Dredge; DRG; Kara Sea; KaraSea97; MULT; Multiple investigations; Sampling gear, diverse; Siberian River Run-Off; SIRRO |
| url | https://doi.org/10.1594/PANGAEA.736640 |