Black Sea Oxygen Trend

'''DEFINITION'''

The oxygenation status of the Black Sea open basin is described by three complementary indicators, derived from vertical profiles and spatially averaged over the Black Sea open basin (depth > 50m). (1) The oxygen penetration depth is the depth at which [O2] < 20µM, expressed in [m]. (2) The oxygen penetration density is the potential density anomaly at the oxygen penetration depth [kg/m³]. (3) The oxygen inventory is the vertically integrated oxygen content [mol O2/m²]. The 20µM threshold was chosen to minimize the indicator sensitivity to sensor’s precision. Those three metrics are complementary: Oxygen penetration depth is more easily understood, but present more spatial variability. Oxygen penetration density helps in dissociating biogeochemical processes from shifts in the physical structure. Although less intuitive, the oxygen inventory is a more integrative diagnostic and its definition is more easily transposed to other areas.

'''CONTEXT'''

The Black Sea is permanently stratified, due to the contrast in density between large riverine and Mediterranean inflows. This stratification restrains the ventilation of intermediate and deep waters and confines, within a restricted surface layer, the waters that are oxygenated by photosynthesis and exchanges with the atmosphere. The vertical extent of the oxic layer determines the volume of habitat available for pelagic populations (Ostrovskii and Zatsepin 2011, Sakınan and Gücü 2017) and present spatial and temporal variations (Murray et al. 1989; Tugrul et al. 1992; Konovalov and Murray 2001). At long and mid-term, these variations can be monitored with three metrics (Capet et al. 2016), derived from the vertical profiles that can obtained from traditional ship casts or autonomous Argo profilers (Stanev et al., 2013). A large source of uncertainty associated with the spatial and temporal average of those metrics stems from the small number of Argo floats, scarcely adequate to sample the known spatial variability of those metrics.

'''CMEMS KEY FINDINGS'''

During the past 60 years, the vertical extent of the Black Sea oxygenated layer has narrowed from 140m to 90m (Capet et al. 2016). The Argo profilers active for 2016 suggested an ongoing deoxygenation trend and indicated an average oxygen penetration depth of 72m at the end of 2016, the lowest value recorded during the past 60 years. The oxygenation of subsurface water is closely related to the intensity of cold water formation, an annual ventilation processes which has been recently limited by warmer-than-usual winter air temperature (Capet et al. 2020). In 2017, 2018 and 2020, however, cold waters were formed, and resulted in a partial reoxygenation of the intermediate layer. As a result no significant trends are observed for the 2010-2020 decade. The decreasing number and ageing of active biogeochemical Argo floats in the Black Sea increases the uncertainty of the three indicators after 2018.

'''DOI (product):'''

https://doi.org/10.48670/moi-00213

 
Citation proposal
Atanas Palazov (BS-IOBAS-VARNA-BG). Black Sea Oxygen Trend. https://services.mspdata.eu:/geonetwork/srv/api/records/7b5af282-d6cb-4f53-80bc-e7f3bdef44dd

Simple

Alternate title
BLKSEA_OMI_HEALTH_oxygen_trend
Date ( Creation )
2018-02-12
Edition
3.4
Edition date
2018-02-12
Identifier
a78600a4-a280-47b5-8ddd-0dc8b5e9c9d9
Credit
E.U. Copernicus Marine Service Information

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  Originator

  Point of contact

  Resource provider

  Distributor

Maintenance and update frequency
Annually
Other
P0M0D0H/P0M0D0H
Maintenance note
N/A
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Oceanographic geographical features
Discipline ( Discipline )
  • in-situ-observation
Climate and Forecast Standard Names ( parameter )
  • ocean_mole_content_of_dissolved_molecular_oxygen , sea_water_sigma_theta_defined_by_mole_concentration_of_dissolved_molecular_oxygen_in_sea_water_above_threshold
Temporal scale ( temporal-scale )
  • multi-year
Area of benefit ( area-of-benefit )
  • marine-safety , coastal-marine-environment , weather-climate-and-seasonal-forecasting , marine-resources
Reference Geographical Areas ( reference-geographical-area )
  • black-sea
Processing level ( processing-level )
Model assimilation ( Theme )
  • Not Applicable
Use limitation
See Copernicus Marine Environment Monitoring Service Data commitments and licence at: http://marine.copernicus.eu/web/27-service-commitments-and-licence.php
Access constraints
Other restrictions
Use constraints
License
Other constraints
No limitations on public access
Aggregate Datasetindentifier
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Association Type
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Initiative Type
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Association Type
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Initiative Type
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Date ( Creation )
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Association Type
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Initiative Type
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Association Type
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Association Type
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Association Type
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Association Type
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Association Type
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Association Type
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Association Type
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2019-05-08
Association Type
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Initiative Type
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Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Metadata language
eng
Topic category
  • Oceans
Description
bounding box
N
S
E
W


Vertical extent

Vertical CRS
Supplemental Information
display priority: 53800
Unique resource identifier
Codespace
EPSG
Number of dimensions
2
Dimension name
Row
Dimension name
Column
Cell geometry
Area
Transformation parameter availability
false
Distribution format
  • NetCDF-4 ( )

OnLine resource
blksea_omi_health_oxygen_trend_annual  
OnLine resource
blksea_omi_health_oxygen_trend_monthly  
Hierarchy level
Series

Conformance result

Date ( Publication )
2010-12-08
Explanation
See the referenced specification
Statement
The myOcean products depends on other products for production or validation. The detailed list of dependencies is given in ISO19115's aggregationInfo (ISO19139 Xpath = "gmd:MD_Metadata/gmd:identificationInfo/gmd:aggregationInfo[./gmd:MD_AggregateInformation/gmd:initiativeType/gmd:DS_InitiativeTypeCode/@codeListValue='upstream-validation' or 'upstream-production']")

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7b5af282-d6cb-4f53-80bc-e7f3bdef44dd   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Series
Hierarchy level name
Copernicus Marine Service product specification
Date stamp
2021-12-10T19:01:32
Metadata standard name
ISO 19139, MyOcean profile
Metadata standard version
0.2

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