Primary production and chlorophyll a in waters of the Kara Sea in September 2007

• Main Author: Mosharov, SA
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: Akademik Mstislav Keldysh; AMK54; AMK54-4946; AMK54-4948; AMK54-4950; AMK54-4952; AMK54-4954; AMK54-4955; AMK54-4956; AMK54-4957; AMK54-4958; AMK54-4960; AMK54-4961; AMK54-4962; AMK54-4963; AMK54-4964; AMK54-4965; AMK54-4966; AMK54-4967; AMK54-4983; AMK54-4984; AMK54-4986; AMK54-4987; AMK54-4988; AMK54-4989; AMK54-4990; AMK54-4991; AMK54-4993; AMK54-4994; AMK54-4995; AMK54-4996; AMK54-4997; AMK54-4998; AMK54-4999; AMK54-5000; AMK54-5001; AMK54-5002; AMK54-5003; AMK54-5004; Archive of Ocean Data; ARCOD; Kara Sea; MULT; Multiple investigations; Obskaya Guba; St. Anna Trough; Yamal Peninsula; ob river
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.764032; https://doi.org/10.1594/PANGAEA.764032

These studies were performed from September 10 to 29, 2007 in the Kara Sea in transects westward of the Yamal Peninsula, near the St. Anna Trough, in the Ob River estuary (Obskay Guba), and on the adjacent shelf. Concentration of chlorophyll a in the euphotic layer varied from 0.02 to 4.37 µg/l, aver. 0.76 µg/l. Primary production in the water column varied from 10.9 to 148.0 mg C/m**2/day (aver. 56.9 mg C/m**2/day). It was shown that frontal zones divided the Kara Sea into distinct areas with different productivities. Maximum levels of primary production were measured in the deep part of the Yamal transect (132.4 mg C/m**2/day) and the shallow Kara Sea shelf near the Ob River estuary (74.9 mg C/m**2/day). Characteristics of these regions were low salinity of the surface water layer (19-25 psu) and elevated silicon concentration (12.8-28.1 µg-atom/l). It is explainable by river runoff. Frontal zones of the Yamal current within the Yamal and Ob transects showed high assimilation numbers reached to 2.32 and 1.49 mg C/mg Chl/hr, respectively; they were maximal for studied areas.