Vertical Variability of Primary Production and Chlorophyll a in the Kara Sea in the Middle of Summer: Contribution of Subsurface Maxima to the Water Column Values     

Demidov  A. B.  Gagarin  V. I.  Eremeeva  E. V.  Artemiev  V. A.  Polukhin  A. A.  Shchuka  S. A.  Grigoriev  A. V.  Khrapko  A. N.  Flint  M. V. 《Oceanology》2021,61(5):645-661

Oceanology - Spatial and vertical variability of primary production (PP) and Chl a were studied in the framework of the 76th cruise of R/V Akademik Mstislav Keldysh to the Kara Sea from July 7 to...  相似文献   

Verification of Kara Sea primary production models with field and satellite observations     

A. B. Demidov  S. V. Sheberstov  S. V. Vazyulya  V. A. Artemiev  S. A. Mosharov  A. N. Khrapko 《Oceanology》2016,56(6):799-808

The depth-integrated model (Ψ-Mod) and depth-resolved Kara Sea model (KDRSM) of primary production in the water column were verified using field (2013–2015) and satellite (MODIS-Aqua scanner, 2007, 2011, 2013–2015) observations. The KSDRM and Ψ-Mod over- or underestimate the values of integrated primary production (IPP) in autumn by a factor of 2 and 2.5 with shipboard data as input parameters; the rootmean-square difference (RMSD) was 0.29 and 0.39, respectively. In summer, the efficiency of Ψ-Mod decreased by a factor of 1.5 (RMSD = 0.57), while the predictive capacity of the KSDRM remained the same (RMSD = 0.31). In the Laptev Sea in autumn, the KSDRM performed better than Ψ-Mod (the RMSD was 0.24 and 0.41, respectively). There was no sufficient decrease in the predictive skill of either algorithm when MODIS-Aqua data were used as input parameters. Thus, Ψ-Mod, being a simple and precise algorithm, can be recommended for evaluating the annual IPP in the Kara Sea and for studying its long-term variability using satellite data.  相似文献   

Penetration of visible solar radiation in waters of the Barents Sea depending on cloudiness and coccolithophore blooms     

O.?V.?KopelevichEmail author  S.?V.?Vazyulya  A.?V.?Grigoriev  A.?N.?Khrapko  S.?V.?Sheberstov  I.?V.?Sahling 《Oceanology》2017,57(3):402-409

Based on satellite and in situ data, we quantitatively estimated the penetration of PAR (photosynthetically available solar radiation in the visible spectral range of 400–700 nm) into waters of the central Barents Sea in the summer seasons of 2014–2016. The effects of cloudiness and coccolithophore blooms on the incidence and penetration of PAR was examined. These blooms occur in the Barents Sea almost every year. We estimated the impact of visible solar radiation on the SST against a background of incoming warmer waters of the Norwegian Current and established that the PAR impact is the most pronounced under clear sky conditions in July and August.  相似文献   

Vertical Variability of Primary Production and Features of the Subsurface Chlorophyll Maximum in the Laptev Sea in August–September, 2015, 2017, and 2018     

Demidov  A. B.  Gagarin  V. I.  Artemiev  V. A.  Arashkevich  E. G.  Makkaveev  P. N.  Shchuka  S. A.  Khrapko  A. N.  Grigoriev  A. V.  Vorobieva  O. V.  Konyukhov  I. V.  Fedorov  A. V. 《Oceanology》2020,60(2):189-204

Oceanology - The vertical distribution of phytoplankton primary production (PP) and chlorophyll a (Chl) was studied based on the data carried out in August–September 2015, 2017, and 2018. The...  相似文献