• Metadata catalogue
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Mediterranean Sea Chlorophyll-a trend

'''DEFINITION'''

This product includes the Mediterranean Sea satellite chlorophyll trend map from 1997 to 2020 based on regional chlorophyll reprocessed (REP) product as distributed by CMEMS OC-TAC. This dataset, derived from multi-sensor (SeaStar-SeaWiFS, AQUA-MODIS, NOAA20-VIIRS, NPP-VIIRS, Envisat-MERIS and Sentinel3A-OLCI) (at 1 km resolution) Rrs spectra produced by CNR using an in-house processing chain, is obtained by means of the Mediterranean Ocean Colour regional algorithms: an updated version of the MedOC4 (Case 1 (off-shore) waters, Volpe et al., 2019, with new coefficients) and AD4 (Case 2 (coastal) waters, Berthon and Zibordi, 2004). The processing chain and the techniques used for algorithms merging are detailed in Colella et al. (2021).

The trend map is obtained by applying Colella et al. (2016) methodology, where the Mann-Kendall test (Mann, 1945; Kendall, 1975) and Sens’s method (Sen, 1968) are applied on deseasonalized monthly time series, as obtained from the X-11 technique (see e. g. Pezzulli et al. 2005), to estimate, trend magnitude and its significance. The trend is expressed in % per year that represents the relative changes (i.e., percentage) corresponding to the dimensional trend [mg m-3 y-1] with respect to the reference climatology (1997-2014). Only significant trends (p < 0.05) are included.

'''CONTEXT'''

Phytoplankton are key actors in the carbon cycle and, as such, recognised as an Essential Climate Variable (ECV). Chlorophyll concentration - as a proxy for phytoplankton - respond rapidly to changes in environmental conditions, such as light, temperature, nutrients and mixing (Colella et al. 2016). The character of the response depends on the nature of the change drivers, and ranges from seasonal cycles to decadal oscillations (Basterretxea et al. 2018). The Mediterranean Sea is an oligotrophic basin, where chlorophyll concentration decreases following a specific gradient from West to East (Colella et al. 2016). The highest concentrations are observed in coastal areas and at the river mouths, where the anthropogenic pressure and nutrient loads impact on the eutrophication regimes (Colella et al. 2016). The the use of long-term time series of consistent, well-calibrated, climate-quality data record is crucial for detecting eutrophication. Furthermore, chlorophyll analysis also demands the use of robust statistical temporal decomposition techniques, in order to separate the long-term signal from the seasonal component of the time series.

'''CMEMS KEY FINDINGS'''

Chlorophyll trend in the Mediterranean Sea, for the period 1997-2020, is negative over most of the basin. Positive trend areas are visible only in the southern part of the western Mediterranean basin, in the Gulf of Lion, Rhode Gyre and partially along the Croatian coast of the Adriatic Sea. On average the trend in the Mediterranean Sea is about -0.5% per year. Nevertheless, as shown by Salgado-Hernanz et al. (2019) in their analysis (related to 1998-2014 satellite observations), there is not a clear difference between western and eastern basins of the Mediterranean Sea. In the Ligurian Sea, the trend switch to negative values, differing from the positive regime observed in the trend maps of both Colella et al. (2016) and Salgado-Hernanz et al. (2019), referred, respectively, to 1998-2009 and 1998-2014 time period, respectively. The waters offshore the Po River mouth show weak negative trend values, partially differing from the markable negative regime observed in the 1998-2009 period (Colella et al., 2016), and definitely moving from the positive trend observed by Salgado-Hernanz et al. (2019).

'''DOI (product):'''

https://doi.org/10.48670/moi-00260

 
Citation proposal
Rosalia SANTOLERI (OC-CNR-ROMA-IT). Mediterranean Sea Chlorophyll-a trend. https://services.mspdata.eu:/geonetwork/srv/api/records/dd5f1e23-de60-4453-86c5-f89c204eb79f

Simple

Alternate title
MEDSEA_OMI_HEALTH_OceanColour_trend
Date ( Creation )
2019-11-28
Edition
3.4
Edition date
2019-11-28
Identifier
a78600a4-a280-47b5-8ddd-0dc8b5e9c9d9
Credit
E.U. Copernicus Marine Service Information

  Custodian

OC-CNR-ROMA-IT - Rosalia SANTOLERI  

  Originator

OC-CNR-ROMA-IT - Gianluca VOLPE  

  Point of contact

OC-CNR-ROMA-IT - CMEMS-DU  

  Resource provider

OC-CNR-ROMA-IT - Simone COLELLA  

  Distributor

MOI-OMI-SERVICE - MOI-OMI-SERVICE  

Maintenance and update frequency
Annually
Other
P0M0D0H/P0M0D0H
Maintenance note
N/A
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Oceanographic geographical features
Discipline ( Discipline )
  • satellite-observation
Climate and Forecast Standard Names ( parameter )
  • change_in_mass_concentration_of_chlorophyll_in_seawater_over_time
Temporal scale ( temporal-scale )
  • multi-year
Area of benefit ( area-of-benefit )
  • weather-climate-and-seasonal-forecasting , marine-safety , coastal-marine-environment , marine-resources
Reference Geographical Areas ( reference-geographical-area )
  • mediterranean-sea
Processing level ( processing-level )
  • Level 4
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
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Aggregate Datasetindentifier
80f2d275-54ad-452d-b864-60787399c92f
Association Type
Cross reference
Initiative Type
document
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Date ( Creation )
2019-05-08
Association Type
Cross reference
Initiative Type
reference
Aggregate Datasetindentifier
09c381ce-7502-453c-af3a-c1e63297d26e
Association Type
Cross reference
Initiative Type
document
Aggregate Datasetindentifier
a5022b84-2435-4ef8-bf29-764fd1b24f36
Association Type
Cross reference
Initiative Type
document
Metadata language
eng
Topic category
  • Oceans
Description
bounding box
N
S
E
W


Vertical extent

Minimum value
0
Maximum value
0
Vertical CRS
  •   urn:ogc:def:crs:EPSG:5714
Supplemental Information
display priority: 53800
Reference system identifier
EPSG / Equirectangular
Number of dimensions
2
Dimension name
Row
Resolution
1  km
Dimension name
Column
Resolution
1  km
Cell geometry
Area
Transformation parameter availability
false
Distribution format
  • NetCDF-4 (Classic model )

Distributor

OnLine resource
medsea_omi_health_oceancolour_trend  
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']")

Metadata

File identifier
dd5f1e23-de60-4453-86c5-f89c204eb79f   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Series
Hierarchy level name
Copernicus Marine Service product specification
Date stamp
2021-12-13T10:15:40
Metadata standard name
ISO 19139, MyOcean profile
Metadata standard version
0.2

  Point of contact

CMEMS  

Website
http://marine.copernicus.eu/  
 
 

  Overviews


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