Dataset: ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a geographic projection, Version 4.2#

Dataset identifier: esacci.OC.day.L3S.K_490.multi-sensor.multi-platform.MERGED.4-2.geographic
Data store: cciodp

How to open this dataset in AVL JupyterLab  

cciodp_store = new_data_store('cciodp')
ds = cciodp_store.open_data('esacci.OC.day.L3S.K_490.multi-sensor.multi-platform.MERGED.4-2.geographic')

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 2019-12-31
Time period 1D

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 Count of the number of observations from the MERIS sensor contributing to this bin cell [none]
MODISA_nobs Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell [none]
SeaWiFS_nobs Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell [none]
VIIRS_nobs 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 Count of the total number of observations contributing to this bin cell [none]

Full variable metadata#

MERIS_nobs#

Field Value
long_name Count of the number of observations from the MERIS sensor contributing to this bin cell
orig_data_type float32
fill_value 0.0
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

MODISA_nobs#

Field Value
long_name Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell
orig_data_type float32
fill_value 0.0
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

SeaWiFS_nobs#

Field Value
long_name Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell
orig_data_type float32
fill_value 0.0
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

VIIRS_nobs#

Field Value
long_name Count of the number of observations from the VIIRS sensor contributing to this bin cell
orig_data_type float32
fill_value 0.0
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

crs#

Field Value
grid_mapping_name latitude_longitude
orig_data_type int32
fill_value 9223372036854775807
size 8128
shape 8128
chunk_sizes 1
file_chunk_sizes 1
data_type int64
dimensions time
file_dimensions time

kd_490#

Field Value
long_name Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm)
units m-1
ancillary_variables kd_490_rmsd kd_490_bias
grid_mapping crs
parameter_vocab_uri http://vocab.ndg.nerc.ac.uk/term/P071/19/CFSN0064
standard_name volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water
units_nonstandard m^-1
orig_data_type float32
fill_value 9.96921e+36
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

kd_490_bias#

Field Value
long_name Bias of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
units m-1
comment Uncertainty lookups derived from file: /data/datasets/CCI/v4.0-production/stage09b-uncertainty_tables/kd/cci_kd_bias.dat
grid_mapping crs
ref http://www.esa-oceancolour-cci.org/?q=webfm_send/581
rel uncertainty
units_nonstandard m^-1
orig_data_type float32
fill_value 9.96921e+36
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

kd_490_rmsd#

Field Value
long_name Root-mean-square-difference of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
units m-1
comment Uncertainty lookups derived from file: /data/datasets/CCI/v4.0-production/stage09b-uncertainty_tables/kd/cci_kd_rmsd.dat
grid_mapping crs
ref http://www.esa-oceancolour-cci.org/?q=webfm_send/581
rel uncertainty
units_nonstandard m^-1
orig_data_type float32
fill_value 9.96921e+36
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

total_nobs#

Field Value
long_name Count of the total number of observations contributing to this bin cell
orig_data_type float32
fill_value 0.0
size 303375974400
shape 8128, 4320, 8640
chunk_sizes 1, 270, 270
file_chunk_sizes 1, 270, 270
data_type float32
dimensions time, lat, lon
file_dimensions time, lat, lon

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 R2018.0 LAC and GAC, MODIS-Aqua L2 R2018.0, MERIS L1B 3rd reprocessing inc OCL corrections, NASA VIIRS L2 R2018.0
title ESA Ocean Colour Climate Change Initiative (Ocean_Colour_cci): Global attenuation coefficient for downwelling irradiance (Kd490) gridded on a geographic projection, Version 4.2
history Source data were: NASA OBPG SeaWiFS level2 R2018.0 LAC and GAC [A/C via l2gen], NASA OBPG VIIRS L2 R2018.0 [A/C via l2gen], NASA OBPG MODIS Aqua L2 R2018.0 and ESA MERIS L1B (3rd reprocessing inc OCL correction) [Polymer v4.8]; Derived products were mainly produced with functions validated from the current NASA SeaDAS release and some custom implementations. Uncertainty generation determined by the fuzzy classifier scheme of Tim Moore (2009). 1579281326 Subsetted from standardised_geo/ESACCI-OC-L3S-OC_PRODUCTS-MERGED-1D_DAILY_4km_GEO_PML_OCx_QAA-19970909-fv4.1.nc to only include variables MERIS_nobs,MODISA_nobs,SeaWiFS_nobs,VIIRS_nobs,crs,kd_490,kd_490_bias,kd_490_rmsd,lat,lon,time,total_nobs
product_version 4-2
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 4.2 Kd490 attenuation coefficient (m-1) for downwelling irradiance product on a geographic 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 4.2 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 geographic grid projection, which is a direct conversion of latitude and longitude coordinates to a rectangular grid, typically a fixed multiplier of 360x180. The netCDF files follow the CF convention for this projection with a resolution of 8640x4320. (A separate dataset is also available for data on a sinusoidal projection).
publication_date 2020-07-01T10:20:09
uuid db32212d86f9431dae67076dd122565e
catalog_url https://catalogue.ceda.ac.uk/uuid/db32212d86f9431dae67076dd122565e
sensor_id multi-sensor
platform_id multi-platform
cci_project OC