861a9cf0-cd92-485b-bf35-453da6fdbc37 Copernicus Marine Service product specification CMEMS servicedesk.cmems@mercator-ocean.eu http://marine.copernicus.eu/ 2025-04-22T08:12:01.555343Z ISO 19139, MyOcean profile 0.2 2 1 1 false EPSG North Atlantic Ocean Chlorophyll-a time series and trend from Observations Reprocessing OMI_HEALTH_CHL_ATLANTIC_OCEANCOLOUR_area_averaged_mean 2018-02-12 3.4 2023-03-30 a78600a4-a280-47b5-8ddd-0dc8b5e9c9d9 '''DEFINITION''' The time series are derived from the regional chlorophyll reprocessed (REP) products as distributed by CMEMS which, in turn, result from the application of the regional chlorophyll algorithms over remote sensing reflectances (Rrs) provided by the ESA Ocean Colour Climate Change Initiative (ESA OC-CCI, Sathyendranath et al. 2019; Jackson 2020). Daily regional mean values are calculated by performing the average (weighted by pixel area) over the region of interest. A fixed annual cycle is extracted from the original signal, using the Census-I method as described in Vantrepotte et al. (2009). The deseasonalised time series is derived by subtracting the mean seasonal cycle from the original time series, and then fitted to a linear regression to, finally, obtain the linear trend. '''CONTEXT''' Phytoplankton – and chlorophyll concentration as a proxy for phytoplankton – respond rapidly to changes in environmental conditions, such as temperature, light and nutrients availability, and mixing. The response in the North Atlantic ranges from cyclical to decadal oscillations (Henson et al., 2009); it is therefore of critical importance to monitor chlorophyll concentration at multiple temporal and spatial scales, in order to be able to separate potential long-term climate signals from natural variability in the short term. In particular, phytoplankton in the North Atlantic are known to respond to climate variability associated with the North Atlantic Oscillation (NAO), with the initiation of the spring bloom showing a nominal correlation with sea surface temperature and the NAO index (Zhai et al., 2013). '''CMEMS KEY FINDINGS''' While the overall trend average for the 1997-2021 period in the North Atlantic Ocean is slightly positive (0.16 ± 0.12 % per year), an underlying low frequency harmonic signal can be seen in the deseasonalised data. The annual average for the region in 2021 is 0.25 mg m-3. Though no appreciable changes in the timing of the spring and autumn blooms have been observed during 2021, a lower peak chlorophyll concentration is observed in the timeseries extension. This decrease in peak concentration with respect to the previous year is contributing to the reduction trend. '''DOI (product):''' https://doi.org/10.48670/moi-00194 E.U. Copernicus Marine Service Information OC-PML-PLYMOUTH-UK P0M0D0H/P0M0D0H N/A https://documentation.marine.copernicus.eu/IMG/OMI_HEALTH_CHL_ATLANTIC_OCEANCOLOUR_area_averaged_mean.png Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2009-09-22 satellite-observation Discipline 2017-04-25 geonetwork.thesaurus.local.discipline.myocean.discipline mass_concentration_of_chlorophyll_in_seawater Climate and Forecast Standard Names 2017-04-04 geonetwork.thesaurus.external.parameter.myocean.ocean-variables multi-year Temporal scale 2024-07-26 geonetwork.thesaurus.local.temporal-scale.myocean.temporal-scale marine-safety weather-climate-and-seasonal-forecasting marine-resources coastal-marine-environment Area of benefit 2024-07-26 geonetwork.thesaurus.local.area-of-benefit.myocean.area-of-benefit iberian-biscay-irish-seas mediterranean-sea baltic-sea Reference Geographical Areas 2024-07-26 geonetwork.thesaurus.local.reference-geographical-area.myocean.reference-geographical-area Level 4 Processing level 2024-07-26 geonetwork.thesaurus.local.processing-level.myocean.processing-level Not Applicable Model assimilation 2016-02-03 geonetwork.thesaurus.external.theme.myocean.model-assimilation Data Mission Atlantic - Resources 2021-12-08 geonetwork.thesaurus.local.theme.mission-atlantic-resources Modelling data Mission Atlantic - Data type (DMP) 2021-11-30 geonetwork.thesaurus.local.theme.mission-atlantic-data-type /Cross-discipline/Rate measurements Mission Atlantic - BODC Parameters 2021-05-04 geonetwork.thesaurus.local.theme.mission-atlantic-bodc-parameters See Copernicus Marine Environment Monitoring Service Data commitments and licence at: http://marine.copernicus.eu/web/27-service-commitments-and-licence.php No limitations on public access Henson, S. A., Dunne, J. P. , and Sarmiento, J. L., 2009, Decadal variability in North Atlantic phytoplankton blooms, J. Geophys. Res., 114, C04013, doi:10.1029/2008JC005139. 2019-05-08 Jackson, T. (2020) OC-CCI Product User Guide (PUG). ESA/ESRIN Report. D4.2PUG, 2020-10-12. Issue:v4.2. https://docs.pml.space/share/s/okB2fOuPT7Cj2r4C5sppDg 2019-05-08 Sathyendranath, S., Pardo, S., Benincasa, M., Brando, V. E., Brewin, R. J.W., Mélin, F., Santoleri, R., 2018, 1.5. Essential Variables: Ocean Colour in Copernicus Marine Service Ocean State Report - Issue 2, Journal of Operational Oceanography, 11:sup1, 1-142, doi: 10.1080/1755876X.2018.1489208 2019-05-08 Sathyendranath, S, Brewin, RJW, Brockmann, C, Brotas, V, Calton, B, Chuprin, A, Cipollini, P, Couto, AB, Dingle, J, Doerffer, R, Donlon, C, Dowell, M, Farman, A, Grant, M, Groom, S, Horseman, A, Jackson, T, Krasemann, H, Lavender, S, Martinez-Vicente, V, Mazeran, C, Mélin, F, Moore, TS, Müller, D, Regner, P, Roy, S, Steele, CJ, Steinmetz, F, Swinton, J, Taberner, M, Thompson, A, Valente, A, Zühlke, M, Brando, VE, Feng, H, Feldman, G, Franz, BA, Frouin, R, Gould, Jr., RW, Hooker, SB, Kahru, M, Kratzer, S, Mitchell, BG, Muller-Karger, F, Sosik, HM, Voss, KJ, Werdell, J, and Platt, T (2019) An ocean-colour time series for use in climate studies: the experience of the Ocean-Colour Climate Change Initiative (OC-CCI). Sensors: 19, 4285. doi:10.3390/s19194285 2019-05-08 Vantrepotte, V., Mélin, F., 2009. Temporal variability of 10-year global SeaWiFS time series of phytoplankton chlorophyll-a concentration. ICES J. Mar. Sci., 66, 1547-1556. doi: 10.1093/icesjms/fsp107. 2019-05-08 Zhai, L., Platt, T., Tang, C., Sathyendranath, S., Walne, A., 2013. The response of phytoplankton to climate variability associated with the North Atlantic Oscillation, Deep Sea Research Part II: Topical Studies in Oceanography, 93, 159-168, doi: 10.1016/j.dsr2.2013.04.009. 2019-05-08 35dbfc51-5694-4ba8-b228-3a5402345316 92b3e86b-ba35-46a3-a12d-b77aa8d3ccc6 28dddf54-a4fa-48fb-b4e3-1be0368f0d81 eng oceans bounding box -46.00 13.00 20.00 66.00 1997-09-04 0 0.0 display priority: 53800 observation vertical level number: 1 false Grid NetCDF-4 Classic model https://stac.marine.copernicus.eu/metadata/OMI_HEALTH_CHL_ATLANTIC_OCEANCOLOUR_area_averaged_mean/omi_health_chl_atlantic_oceancolour_area_averaged_mean_202211/dataset.stac.json WWW:STAC omi_health_chl_atlantic_oceancolour_area_averaged_mean For accessing native data and Analysis-ready Cloud-optimized data services, consult this STAC metadata endpoint COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 See the referenced specification 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']")