Organic matter mineralization in the deep water of the Gotland Basin (Baltic Sea): Rates and oxidant demand

2019 ◽  
Vol 195 ◽  
pp. 20-29
Author(s):  
B. Schneider ◽  
S. Otto
Keyword(s):  
Organic Matter ◽  
Baltic Sea ◽  
Deep Water ◽  
Gotland Basin ◽  
Organic Matter Mineralization

scholarly journals Nitrous oxide water column distribution during the transition from anoxic to oxic conditions in the Baltic Sea

2006 ◽  
Vol 3 (3) ◽  
pp. 729-764 ◽  
Author(s):  
S. Walter ◽  
U. Breitenbach ◽  
H. W. Bange ◽  
G. Nausch ◽  
D. W. R. Wallace
Keyword(s):  
Nitrous Oxide ◽  
Baltic Sea ◽  
Water Column ◽  
North Sea ◽  
Deep Water ◽  
Sea Water ◽  
The Baltic Sea ◽  
Gotland Basin ◽  
Water Renewal ◽  
The Baltic

Abstract. In January 2003, a major inflow of cold and oxygen-rich North Sea Water in the Baltic Sea terminated an ongoing stagnation period in parts of the central Baltic Sea. In order to investigate the role of North Sea Water inflow to the Baltic Sea with regard to the production of nitrous oxide (N2O), we measured dissolved and atmospheric N2O at 26 stations in the southern and central Baltic Sea in October 2003. At the time of our cruise, water renewal had proceeded to the eastern Gotland Basin, whereas the western Gotland Basin was still unaffected by the inflow. The deep water renewal was detectable in the distributions of temperature, salinity, and oxygen concentrations as well as in the distribution of the N2O concentrations: Shallow stations in the Kiel Bight and Pomeranian Bight were well-ventilated with uniform N2O concentrations near equilibrium throughout the water column. In contrast, stations in the deep basins, such as the Bornholm and the Gotland Deep, showed a clear stratification with deep water affected by North Sea Water. Inflowing North Sea Water led to changed environmental conditions, especially enhanced oxygen (O2) or declining hydrogen sulfide (H2S) concentrations, thus, affecting the conditions for the production of N2O. Pattern of N2O profiles and correlations with parameters like oxygen and nitrate differed between the basins. The dominant production pathway seems to be nitrification rather than denitrification. No indications for advection of N2O by North Sea Water were found. A rough budget revealed a significant surplus of in situ produced N2O after the inflow. However, due to the permanent halocline, it can be assumed that the formed N2O does not reach the atmosphere. Hydrographic aspects therefore are decisive factors determining the final release of produced N2O to the atmosphere.

Temporal and spatial sedimentation rate variabilities in the eastern Gotland Basin, the Baltic Sea

Boreas ◽  
2002 ◽  
Vol 31 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Christian Christiansen ◽  
Helmar Kunzendorf ◽  
Kay-Christian Emeis ◽  
Rudolf Endler ◽  
Ulrich Struck ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Sedimentation Rate ◽  
The Baltic Sea ◽  
Gotland Basin ◽  
Temporal And Spatial ◽  
The Baltic

T4-like Phages Reveal the Potential Role of Viruses in Soil Organic Matter Mineralization

2021 ◽  
Author(s):  
Xiaomeng Wei ◽  
Tida Ge ◽  
Chuanfa Wu ◽  
Shuang Wang ◽  
Kyle Mason-Jones ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Potential Role ◽  
Organic Matter Mineralization

Origin and Preservation Conditions of Organic Matter in the Mozambique Channel: Evidence for Widespread Oxidation Processes in the Deep-Water Domains

2021 ◽  
pp. 106589
Author(s):  
Martina Torelli ◽  
Anne Battani ◽  
Daniel Pillot ◽  
Eric Kohler ◽  
Joel Lopes De Azevedo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Deep Water ◽  
Oxidation Processes ◽  
Mozambique Channel ◽  
Preservation Conditions

Long-term changes in primary production and mineralization of organic matter in the Neva Estuary (Baltic Sea)

2017 ◽  
Vol 171 ◽  
pp. 73-80 ◽  
Author(s):  
Sergey Golubkov ◽  
Mikhail Golubkov ◽  
Alexei Tiunov ◽  
Vera Nikulina
Keyword(s):  
Organic Matter ◽  
Primary Production ◽  
Baltic Sea ◽  
Neva Estuary ◽  
Long Term Changes ◽  
Mineralization Of Organic Matter

Effects of organic matter mineralization on the respiratory activity in rice field sediments

1994 ◽  
Vol 25 (3) ◽  
pp. 1361-1364
Author(s):  
E. Novella ◽  
V. N. Astorga ◽  
E. Fores
Keyword(s):  
Organic Matter ◽  
Rice Field ◽  
Respiratory Activity ◽  
Organic Matter Mineralization

scholarly journals Cell-free extracellular enzymatic activity is linked to seasonal temperature changes: a case study in the Baltic Sea

2016 ◽  
Vol 13 (9) ◽  
pp. 2815-2821 ◽  
Author(s):  
Federico Baltar ◽  
Catherine Legrand ◽  
Jarone Pinhassi
Keyword(s):  
Organic Matter ◽  
Baltic Sea ◽  
Extracellular Enzymes ◽  
Seasonal Pattern ◽  
Critical Factor ◽  
Hydrolytic Activity ◽  
Seasonal Temperature ◽  
The Baltic Sea ◽  
The Baltic ◽  
Hydrolysis Of

Abstract. Extracellular enzymatic activities (EEAs) are a crucial step in the degradation of organic matter. Dissolved (cell-free) extracellular enzymes in seawater can make up a significant contribution of the bulk EEA. However, the factors controlling the proportion of dissolved EEA in the marine environment remain unknown. Here we studied the seasonal changes in the proportion of dissolved relative to total EEA (of alkaline phosphatase (APase), β-glucosidase (BGase), and leucine aminopeptidase (LAPase)), in the Baltic Sea for 18 months. The proportion of dissolved EEA ranged between 37 and 100, 0 and 100, and 34 and 100 % for APase, BGase, and LAPase, respectively. A consistent seasonal pattern in the proportion of dissolved EEA was found among all the studied enzymes, with values up to 100 % during winter and  <  40 % during summer. A significant negative relation was found between the proportion of dissolved EEA and temperature, indicating that temperature might be a critical factor controlling the proportion of dissolved relative to total EEA in marine environments. Our results suggest a strong decoupling of hydrolysis rates from microbial dynamics in cold waters. This implies that under cold conditions, cell-free enzymes can contribute to substrate availability at large distances from the producing cell, increasing the dissociation between the hydrolysis of organic compounds and the actual microbes producing the enzymes. This might also suggest a potential effect of global warming on the hydrolysis of organic matter via a reduction of the contribution of cell-free enzymes to the bulk hydrolytic activity.

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