Northeast Atlantic Ocean, Loire River, DIVAnd 4D seasonal analysis of Water body dissolved inorganic nitrogen 1971/2021 v2023 [time][lat][lon], 1996

Northeast Atlantic Ocean - Loire River - DIVAnd 4D seasonal analysis of Water body dissolved inorganic nitrogen 1971/2021 v2023. Seasonal climatology of Water body dissolved inorganic nitrogen for Loire river for the period 1971-2021 and for the following seasons:
- winter: January-March,
- spring: April-June,
- summer: July-September,
- autumn: October-December.
Observation data span from 1971 to 2021.
Depth levels (m): [0.0, 2.0, 4.0, 6.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0, 40.0, 45.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 110.0, 120.0, 130.0].
Data sources: observational data from SeaDataNet/EMODNet Chemistry Data Network.
Description of DIVAnd analysis: the computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.4, using GEBCO 15 sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps is 0.01 degrees. Horizontal correlation length is defined seasonally (in meters): 72000 (winter), 43000 (spring), 215000 (summer), 150000 (autumn). Vertical correlation length was optimized and vertically filtered and a seasonally-averaged profile was used (DIVAnd.fitvertlen). 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: the vertically-filtered data mean profile is substracted from the data. Detrending of data: no, advection constraint applied: no.
Units: umol/l.
abstract=Seasonal climatology of Water body dissolved inorganic nitrogen for Loire river for the period 1971-2021 and for the following seasons:
- winter: January-March,
- spring: April-June,
- summer: July-September,
- autumn: October-December.
Observation data span from 1971 to 2021.
Depth levels (m): [0.0, 2.0, 4.0, 6.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0, 40.0, 45.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 110.0, 120.0, 130.0].
Data sources: observational data from SeaDataNet/EMODNet Chemistry Data Network.
Description of DIVAnd analysis: the computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.4, using GEBCO 15 sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps is 0.01 degrees. Horizontal correlation length is defined seasonally (in meters): 72000 (winter), 43000 (spring), 215000 (summer), 150000 (autumn). Vertical correlation length was optimized and vertically filtered and a seasonally-averaged profile was used (DIVAnd.fitvertlen). 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: the vertically-filtered data mean profile is substracted from the data. Detrending of data: no, advection constraint applied: no.
Units: umol/l.
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=2023-05-16T17:48:27.701
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/10.13120/02a960b4-15f8-450e-ae23-af3616ca3ee3
Easternmost_Easting=-1.0099315643310547
file_name=Water_body_dissolved_inorganic_nitrogen.nc
geospatial_lat_max=47.99970626831055
geospatial_lat_min=46.25
geospatial_lat_resolution=0.009998321533203125
geospatial_lat_units=degrees_north
geospatial_lon_max=-1.0099315643310547
geospatial_lon_min=-4.010000228881836
geospatial_lon_resolution=0.010000228881835938
geospatial_lon_units=degrees_east
history=Tue Aug 29 17:02:49 2023: ncks -O Water_body_dissolved_inorganic_nitrogen.nc Water_body_dissolved_inorganic_nitrogen.nc
id=DatasetScan/emodnet-projects/v2023/Coastal_areas/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_inorganic_nitrogen.nc
infoUrl=http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2023/Coastal_areas/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_inorganic_nitrogen.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=47.99970626831055
parameter_keyword=Water body dissolved inorganic nitrogen
parameter_keyword_urn=SDN:P35::EPC00198
product_code=Loire-Water_body_dissolved_inorganic_nitrogen-v2023-ANA
product_id=02a960b4-15f8-450e-ae23-af3616ca3ee3
project=EMODNET Chemistry - Phase 5
search_keywords=Dissolved inorganic nitrogen concentration in the water column
search_keywords_urn=SDN:P02::TDIN
source=observational data from SeaDataNet/EMODnet Chemistry Data Network
sourceUrl=http://opendap.oceanbrowser.net/thredds/dodsC/data/emodnet-projects/v2023/Coastal_areas/Northeast_Atlantic_Ocean_-_Loire_River/Water_body_dissolved_inorganic_nitrogen.nc
Southernmost_Northing=46.25
standard_name_vocabulary=CF Standard Name Table v70
time_coverage_end=1996-11-16T00:00:00Z
time_coverage_start=1996-02-16T00:00:00Z
Westernmost_Easting=-4.010000228881836

东北大西洋海域-卢瓦尔河-基于DIVAnd方法的1971/2021年4D季节性水体溶解无机氮分析。本数据集记录了卢瓦尔河流域1971年至2021年间以及后续各季节（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）水体溶解无机氮的季节性气候学特征。观测数据范围覆盖1971年至2021年。深度层次（米）：[0.0, 2.0, 4.0, 6.0, 8.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0, 40.0, 45.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 110.0, 120.0, 130.0]。数据来源：SeaDataNet/EMODNet化学数据网络观测数据。DIVAnd分析描述：计算采用DIVAnd（n维数据插值变分分析）版本2.7.4，利用GEBCO 15秒地形数据建立水体空间连通性。生成的DIVAnd地图水平分辨率为0.01度。水平相关长度按季节定义（米）：冬季72000，春季43000，夏季215000，秋季150000。垂直相关长度经过优化并垂直滤波，使用季节平均剖面（DIVAnd.fitvertlen）。信号与噪声比固定为垂直剖面1，时间序列0.1，以考虑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：从数据中减去垂直滤波后的数据平均值剖面。数据去趋势：否，应用平流约束：否。单位：微摩尔/升。