Dataset: ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a sinusoidal projection, Version 3.1#

Dataset identifier: esacci.OC.8-days.L3S.K_490.multi-sensor.multi-platform.MERGED.3-1.sinusoidal
Data store: cciodp

How to open this dataset in AVL JupyterLab  

cciodp_store = new_data_store('cciodp')
ds = cciodp_store.open_data('esacci.OC.8-days.L3S.K_490.multi-sensor.multi-platform.MERGED.3-1.sinusoidal')

Bounding box map#

Bounding box map
Map tiles and data from OpenStreetMap, under the ODbL.

Basic information#

Parameter Value
Bounding box longitude (°) -180.0 to 180.0
Bounding box latitude (°) -90.0 to 90.0
Time range 1997-09-03 to 2016-12-31
Time period 8D

Click here for full dataset metadata.

Variable list#

Click on a variable name to jump to the variable’s full metadata.

Variable Long name Units
MERIS_nobs_sum Count of the number of observations from the MERIS sensor contributing to this bin cell [none]
MODISA_nobs_sum Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell [none]
SeaWiFS_nobs_sum Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell [none]
VIIRS_nobs_sum Count of the number of observations from the VIIRS sensor contributing to this bin cell [none]
kd_490 Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm) m-1
kd_490_bias Bias of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009 m-1
kd_490_rmsd Root-mean-square-difference of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009 m-1
total_nobs_sum Count of the total number of observations contributing to this bin cell [none]

Full variable metadata#

MERIS_nobs_sum#

Field Value
long_name Count of the number of observations from the MERIS sensor contributing to this bin cell
number_of_files_composited 6
coordinates lat lon
orig_data_type float32
fill_value 0.0
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

MODISA_nobs_sum#

Field Value
long_name Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell
number_of_files_composited 6
coordinates lat lon
orig_data_type float32
fill_value 0.0
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

SeaWiFS_nobs_sum#

Field Value
long_name Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell
number_of_files_composited 6
coordinates lat lon
orig_data_type float32
fill_value 0.0
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

VIIRS_nobs_sum#

Field Value
long_name Count of the number of observations from the VIIRS sensor contributing to this bin cell
coordinates lat lon
number_of_files_composited 6
orig_data_type float32
fill_value 0.0
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

crs#

Field Value
total_number_of_bins 23761676
number_of_latitude_rows 4320
grid_mapping_name 1D binned sinusoidal
orig_data_type int32
fill_value 9223372036854775807
size 890
shape 890
chunk_sizes 1
file_chunk_sizes 1
data_type int64
dimensions time
file_dimensions time

kd_490#

Field Value
ancillary_variables kd_490_rmsd kd_490_bias
coordinates lat lon
grid_mapping crs
long_name Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm)
standard_name volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water
units m-1
units_nonstandard m^-1
parameter_vocab_uri http://vocab.nerc.ac.uk/collection/P04/current/
orig_data_type float32
fill_value 9.96921e+36
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

kd_490_bias#

Field Value
coordinates lat lon
grid_mapping crs
long_name Bias of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
rel uncertainty
units m-1
units_nonstandard m^-1
comment Uncertainty lookups derived from file: /data/datasets/CCI/v3.1-production/stage09b-uncertainty_tables/kd/cci_kd_bias.dat
ref http://www.esa-oceancolour-cci.org/?q=webfm_send/581
orig_data_type float32
fill_value 9.96921e+36
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

kd_490_rmsd#

Field Value
coordinates lat lon
grid_mapping crs
long_name Root-mean-square-difference of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
rel uncertainty
units m-1
units_nonstandard m^-1
comment Uncertainty lookups derived from file: /data/datasets/CCI/v3.1-production/stage09b-uncertainty_tables/kd/cci_kd_rmsd.dat
ref http://www.esa-oceancolour-cci.org/?q=webfm_send/581
orig_data_type float32
fill_value 9.96921e+36
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

total_nobs_sum#

Field Value
long_name Count of the total number of observations contributing to this bin cell
coordinates lat lon
number_of_files_composited 6
orig_data_type float32
fill_value 0.0
size 21147891640
shape 890, 23761676
chunk_sizes 1, 1048576
file_chunk_sizes 1, 1048576
data_type float32
dimensions time, bin_index
file_dimensions time, bin_index

Full dataset metadata#

Field Value
comment See summary attribute
processing_level L3S
project Climate Change Initiative - European Space Agency
references http://www.esa-oceancolour-cci.org/
source NASA SeaWiFS L2 R2014.0 LAC and GAC, MODIS-Aqua L1A, MERIS L1B 3rd reprocessing inc OCL corrections, NASA VIIRS L2 R2014.0.1 (data identical to R2014.0.2)
title ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a sinusoidal projection, Version 3.1
history Source data were: ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_SIN_PML_OCx_QAA-19970915-fv3.1.nc, ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_SIN_PML_OCx_QAA-19970916-fv3.1.nc, ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_SIN_PML_OCx_QAA-19970918-fv3.1.nc, ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_SIN_PML_OCx_QAA-19970919-fv3.1.nc, ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_SIN_PML_OCx_QAA-19970920-fv3.1.nc, ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_SIN_PML_OCx_QAA-19970921-fv3.1.nc; netcdf_compositor_cci composites Rrs_412, Rrs_443, Rrs_490, Rrs_510, Rrs_555, Rrs_670, water_class1, water_class2, water_class3, water_class4, water_class5, water_class6, water_class7, water_class8, water_class9, water_class10, water_class11, water_class12, water_class13, water_class14, atot_412, atot_443, atot_490, atot_510, atot_555, atot_670, aph_412, aph_443, aph_490, aph_510, aph_555, aph_670, adg_412, adg_443, adg_490, adg_510, adg_555, adg_670, bbp_412, bbp_443, bbp_490, bbp_510, bbp_555, bbp_670, chlor_a, kd_490, chlor_a_log10_bias, Rrs_412_bias, Rrs_443_bias, Rrs_490_bias, Rrs_510_bias, Rrs_555_bias, Rrs_670_bias, aph_412_bias, aph_443_bias, aph_490_bias, aph_510_bias, aph_555_bias, aph_670_bias, adg_412_bias, adg_443_bias, adg_490_bias, adg_510_bias, adg_555_bias, adg_670_bias, kd_490_bias with --mean, chlor_a_log10_rmsd, Rrs_412_rmsd, Rrs_443_rmsd, Rrs_490_rmsd, Rrs_510_rmsd, Rrs_555_rmsd, Rrs_670_rmsd, aph_412_rmsd, aph_443_rmsd, aph_490_rmsd, aph_510_rmsd, aph_555_rmsd, aph_670_rmsd, adg_412_rmsd, adg_443_rmsd, adg_490_rmsd, adg_510_rmsd, adg_555_rmsd, adg_670_rmsd, kd_490_rmsd with --root-mean-square, and SeaWiFS_nobs, MODISA_nobs, MERIS_nobs, VIIRS_nobs, total_nobs - with --total 1472045738 Subsetted from standardised_sine/ESACCI-OC-L3S-OC_PRODUCTS-MERGED-8D_DAILY_4km_SIN_PML_OCx_QAA-19970914-fv3.1.nc to only include variables MERIS_nobs_sum,MODISA_nobs_sum,SeaWiFS_nobs_sum,VIIRS_nobs_sum,crs,kd_490,kd_490_bias,kd_490_rmsd,lat,lon,time,total_nobs_sum
product_version 3-1
ecv OC
institute Plymouth Marine Laboratory
product_string MERGED
data_type K_490
abstract The ESA Ocean Colour CCI project has produced global level 3 binned multi-sensor time-series of satellite ocean-colour data with a particular focus for use in climate studies. This dataset contains the Version 3.1 Kd490 attenuation coefficient (m-1) for downwelling irradiance product on a sinusoidal projection at approximately 4 km spatial resolution and at a number of time resolutions (daily, 5-day, 8-day and monthly composites). It is computed from the Ocean Colour CCI Version 3.1 inherent optical properties dataset at 490 nm and the solar zenith angle. Note, these data are also contained within the 'All Products' dataset. This data product is on a sinusoidal equal-area grid projection, matching the NASA standard level 3 binned projection. The default number of latitude rows is 4320, which results in a vertical bin cell size of approximately 4 km. The number of longitude columns varies according to the latitude, which permits the equal area property. Unlike the NASA format, where the bin cells that do not contain any data are omitted, the CCI format retains all cells and simply marks empty cells with a NetCDF fill value. (A separate dataset is also available for data on a geographic projection).
publication_date 2018-06-25T17:04:08
uuid 159649796f2943689a836999016188f0
catalog_url https://catalogue.ceda.ac.uk/uuid/159649796f2943689a836999016188f0
sensor_id multi-sensor
platform_id multi-platform
cci_project OC