1 MSFD unit information

Sub_loc:
ABI-FR-MS-GDG-ZL12M
Pa_def:
Name:
9/12/2018
Orig_name:
ABI-FR-MS-GDG-ZL12M
Desig:
Large SRM GdG (12 M)
Desig_eng:
NA
Desig_type:
NA
Iucn_cat:
06-07-2018
Int_crit:
NA
Marine:
euMarineReportingUnitCode
Rep_m_area:
15-10-2018
Gis_m_area:
water
Rep_area:
marineRegion
Gis_area:
marineSubdivision
Not_take:
MSFD
Not_tk_take:
Directive 2008/56/EC of the European Parliament and of the Council of 17 June 2008 establishing a framework for community action in the field of marine environmental policy (Marine Strategy Framework Directive)
Status:
2008-06-25
Status_yr:
publication
Gov_type:
Own_type:
european
Mang_auth:
ABI
Mang_plan:
euMarineRegionCode
Verif:
FR
Metadata_i:
166140

2 Data information

Monthly mean sea surface Chlorophyll-a concentration (in mg.m^-3 (log10) at 4km resolution - Satellite remote sensing Ocean color data): Chlorophyll is a photosynthetic pigment commonly present in all phytoplankton species. It is used as a proxy for phytoplankton biomass. Chlorophyll concentration is a standard product from satellite-based optical sensors, usually retrieved from empirical algorithms using reflectance ratios at two or more wavebands.

Access metadata from landing page

3 Geographical extent

3.1 Coordinates

## [1] "West-Longitude: -10.08"
## [1] "South-Latitude: 43.59"
## [1] "East-Longitude: -1.44"
## [1] "North-Latitude: 48"

3.2 Defined area

Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL.

4 Analysis (graphs)

4.1 Monthly composite

Click on the image to enlarge

4.2 Average

4.3 Monthly climatology

4.4 Monthly boxplot

5 Analysis (data)

5.1 Average seasonal decomposition

5.2 Download

name unite timerange pixelnb fracnbna fractsna mean sd min max varseason vartrend trendtest sen.slope
CHLA mg.m-3 1998.01/2020.12 11266 1.98 0 0.5124208 0.3568326 0.0044771 14.95162 76.8446 4.212825 0 0.0057719

Download analysis data (csv) [Time,“Time series”,“Seasonal component”,“Trend”,“Residual”]

6 Dynamic graphs

6.1 Time series



6.2 Seasonal component



6.3 Trend



6.4 Residual



7 References


The parameters are monthly data.

var gives the short name of the parameter processed.

timerange is the time range of the parameter.

pixelnb gives the number of x by x km pixels covering the defined geographical extent.

fracnbna is the percentage of missing data in the defined area over the time range.

fractsna is the percentage of missing value for the time series of the parameters. This time serie is calculated using the monthly mean of the pixel values inside the defined area.

mean is the average value of the parameter inside the defined area over the time range.

sd is the standard deviation of the parameter values inside the defined area over the time range.

min is the minimum of the parameter values inside the defined area over the time range.

max is the maximum of the parameter values inside the defined area over the time range.

The monthly time series X(t) of the parameter is decomposed as X(t)=S(t)+T(t)+I(t) (see Vantrepotte and Melin, 2009), where S, T, and I represent, respectively, a seasonal signal, a trend, and an irregular (or residual) component (or remainder). These components are presented in the figure “seasonal composition”.

In this framework:
varseason is the percentage of variance associated with the seasonal component and “vartrend” the percentage of variance associated with the linear component (the trend).

A statistical test (Kendall rank correlation coefficient) is performed on the linear component in order to assess the significance of a monotic trend:
trendtest gives the p.value associated to this test.

senslope gives the value of the Sen slope (alternately, Theil slope). This value is the median slope joining all pairs of observations and is expressed by quantity per year.

References: Vantrepotte, V. Melin, F. Temporal variability of 10-year global SeaWiFS time-series of phytoplankton chlorophyll a concentration ICES J. Mar. Sci., 2009, 66, 1547-1556

8 Open-notebook

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