Northeast Atlantic Ocean, DIVAnd 4D seasonal 6-year average analysis of Water body chlorophyll-a 1971/2021 v2023 [time][depth][lat][lon], 0.1°, 1973-2018

Northeast Atlantic Ocean - DIVAnd 4D seasonal 6-year average analysis of Water body chlorophyll-a 1971/2021 v2023. Moving 6-year analysis of Water body chlorophyll-a in the NorthEast Atlantic for each season:
- winter: January-March,
- spring: April-June,
- summer: July-September,
- autumn: October-December.
Every year of the time dimension corresponds to the 6-year centred average of each season. 6-year periods span from 1971/1976 until 2016/2021. Observation data span from 1971 to 2021.
High-frequency observation trails were filtered to a 3h temporal resolution.
Depth levels (International Oceanographic Data Exchange (IODE) standard depths): [0.0, 5.0, 10.0, 20.0, 30.0, 40.0, 50.0, 75.0, 100.0, 125.0, 150.0, 200.0, 250.0, 300.0].
Data sources: observational data from SeaDataNet/EMODNet Chemistry Data Network.
Descrption of DIVAnd analysis: the computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.4, using GEBCO 30 sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps is 0.1 degrees. Horizontal correlation length varies from 200km in open sea regions to 50km at the coast. Vertical correlation length is defined as twice the vertical resolution. Signal-to-noise ratio was fixed to 1 for vertical profiles and 0.1 for time series to account for the redundancy in the time series observations. A logarithmic transformation (DIVAnd.loglin) was applied to the data prior to the analysis. Background field: a vertically-filtered profile of the seasonal data mean value (including all years) is substracted from the data.
Detrending of data: no, advection constraint applied: no.
Units: mg/m3.
abstract=Moving 6-year analysis of Water body chlorophyll-a in the NorthEast Atlantic for each season:
- winter: January-March,
- spring: April-June,
- summer: July-September,
- autumn: October-December.
Every year of the time dimension corresponds to the 6-year centred average of each season. 6-year periods span from 1971/1976 until 2016/2021. Observation data span from 1971 to 2021.
High-frequency observation trails were filtered to a 3h temporal resolution.
Depth levels (IODE standard depths): [0.0, 5.0, 10.0, 20.0, 30.0, 40.0, 50.0, 75.0, 100.0, 125.0, 150.0, 200.0, 250.0, 300.0].
Data sources: observational data from SeaDataNet/EMODNet Chemistry Data Network.
Descrption of DIVAnd analysis: the computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.4, using GEBCO 30 sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps is 0.1 degrees. Horizontal correlation length varies from 200km in open sea regions to 50km at the coast. Vertical correlation length is defined as twice the vertical resolution. Signal-to-noise ratio was fixed to 1 for vertical profiles and 0.1 for time series to account for the redundancy in the time series observations. A logarithmic transformation (DIVAnd.loglin) was applied to the data prior to the analysis. Background field: a vertically-filtered profile of the seasonal data mean value (including all years) is substracted from the data.
Detrending of data: no, advection constraint applied: no.
Units: mg/m3.
Acknowledgements=Aggregated data products are generated by EMODnet Chemistry under the support of DG MARE Call for Tenders EASME/2020/OP/0006 (EASME/EMFF/2020/3.1.11/Lot 5/SI2.846161).
area_keywords=Northeast Atlantic Ocean (40W)
area_keywords_urn=SDN:C19::SVX00015
Author_email=Quitterie CAZENAVE <[e-mail]> Julie GATTI <[e-mail]>
bathymetry_source=resolution: 0.1 degree, based on the global GEBCO Digital Atlas, 30 sec, 2014
cdm_data_type=Grid
citation=Usage is subject to mandatory citation: "This resource was generated in the framework of EMODnet Chemistry, under the support of DG MARE Call for Tender EASME/EMFF/2020/3.1.11/European Marine Observation and Data Network (EMODnet) - Lot 5 - Chemistry"
Conventions=CF-1.6, COARDS, ACDD-1.3
date=2023-05-16T16:39:44.282
DIVA_references=Barth, A., Beckers, J.-M., Troupin, C., Alvera-Azcarate, A., and Vandenbulcke, L. (2014): divand-1.0: n-dimensional variational data analysis for ocean observations, Geosci. Model Dev., 7, 225-241, doi: 10.5194/gmd-7-225-2014
DIVAnd_code_doi=10.5281/zenodo.7016823
DIVAnd_references=Barth, A.; Beckers, J.-M.; Troupin, C.; Alvera-Azcarate, A & Vandenbulcke, L. divand-1.0: n-dimensional variational data analysis for ocean observations. Geoscientific Model Development, 2014, 7, 225-241. DOI: 10.5194/gmd-7-225-2014
DIVAnd_source=https://github.com/gher-uliege/DIVAnd.jl
DIVAnd_version=v2.7.9
doi=https://doi.org/10.13120/a3461fb1-d209-440e-a49f-7acff7731395
Easternmost_Easting=-0.1
file_name=Water_body_chlorophyll-a.4Danl.nc
geospatial_lat_max=47.9
geospatial_lat_min=25.0
geospatial_lat_resolution=0.09999999999999999
geospatial_lat_units=degrees_north
geospatial_lon_max=-0.1
geospatial_lon_min=-42.0
geospatial_lon_resolution=0.09999999999999999
geospatial_lon_units=degrees_east
history=Fri Sep 1 10:35:26 2023: ncks -O Water_body_chlorophyll-a.4Danl.nc Water_body_chlorophyll-a.4Danl.nc
id=DatasetScan/emodnet-projects/v2023/By_sea_regions/Northeast_Atlantic_Ocean/Water_body_chlorophyll-a.4Danl.nc
infoUrl=http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2023/By_sea_regions/Northeast_Atlantic_Ocean/Water_body_chlorophyll-a.4Danl.nc.html
institution=IFREMER, SISMER, Scientific Information Systems for the SEA
institution_urn=SDN:EDMO::486
NCO=netCDF Operators version 4.9.9 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)
Northernmost_Northing=47.9
parameter_keyword=Water body chlorophyll-a
parameter_keyword_urn=SDN:P35::EPC00105
product_code=Atlantic-Water_body_chlorophyll-a-v2023-ANA
product_id=a3461fb1-d209-440e-a49f-7acff7731395
project=EMODNET Chemistry - Phase 5
search_keywords=Chlorophyll pigment concentrations in water bodies
search_keywords_urn=SDN:P02::CPWC
source=observational data from SeaDataNet/EMODnet Chemistry Data Network
sourceUrl=http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2023/By_sea_regions/Northeast_Atlantic_Ocean/Water_body_chlorophyll-a.4Danl.nc
Southernmost_Northing=25.0
standard_name_vocabulary=CF Standard Name Table v70
time_coverage_end=2018-11-16T00:00:00Z
time_coverage_start=1973-02-16T00:00:00Z
Westernmost_Easting=-42.0

东北大西洋海域 - DIVAnd 四维季节性六年平均水体叶绿素-a 分析（1971/2021，版本2023）。东北大西洋水体叶绿素-a 的六年移动分析，按每个季节划分：

- 冬季：一月至三月
- 春季：四月至六月
- 夏季：七月至九月
- 秋季：十月至十二月

时间维度中的每年对应每个季节的六年中心平均值。六年周期从1971/1976年至2016/2021。观测数据范围从1971年至2021年。
高频观测轨迹被过滤至3小时的时间分辨率。
深度层次（国际海洋学数据交换（IODE）标准深度）：[0.0, 5.0, 10.0, 20.0, 30.0, 40.0, 50.0, 75.0, 100.0, 125.0, 150.0, 200.0, 250.0, 300.0]。
数据来源：SeaDataNet/EMODNet 化学数据网络观测数据。
DIVAnd 分析描述：计算使用DIVAnd（n 维数据插值变分分析），版本2.7.4，利用GEBCO 30秒地形数据作为水团的空间连通性。生成的DIVAnd地图的水平分辨率为0.1度。水平相关长度在开阔海域为200公里，沿海地区为50公里。垂直相关长度定义为垂直分辨率的两倍。信号与噪声比固定为垂直剖面1，时间序列0.1，以考虑到时间序列观测中的冗余。在分析之前对数据应用了对数变换（DIVAnd.loglin）。背景场：从数据中减去包括所有年份的季节数据平均值的垂直过滤剖面。
数据去趋势：否，应用平流约束：否。
单位：mg/m3。