Sentinel-5P NRTI O3: Near Real-Time Ozone

Dataset Availability

2018-07-10T11:02:44Z–2024-12-19T08:40:07Z

Dataset Provider

European Union/ESA/Copernicus

Earth Engine Snippet

ee.ImageCollection("COPERNICUS/S5P/NRTI/L3_O3")

Revisit Interval

2 Days

Tags

air-quality copernicus esa eu o3 ozone pollution s5p sentinel tropomi

Description

NRTI/L3_O3

This dataset provides near-real-time high-resolution imagery of total column ozone concentrations. See also COPERNICUS/S5P/OFFL/L3_O3_TCL for the tropospheric column data.

In the stratosphere, the ozone layer shields the biosphere from dangerous solar ultraviolet radiation. In the troposphere, it acts as an efficient cleansing agent, but at high concentration it also becomes harmful to the health of humans, animals, and vegetation. Ozone is also an important greenhouse-gas contributor to ongoing climate change. Since the discovery of the Antarctic ozone hole in the 1980s and the subsequent Montreal Protocol regulating the production of chlorine-containing ozone-depleting substances, ozone has been routinely monitored from the ground and from space.

For this product, there are two algorithms that deliver total ozone: GDP for the near real-time and GODFIT for the offline products. GDP is currently being used for generating the operational total ozone products from GOME, SCIAMACHY and GOME-2; while GODFIT is being used in the ESA CCI and the Copernicus C3S projects. More information. Product user manual.

NRTI L3 Product

To make our NRTI L3 products, we use harpconvert to grid the data.

The qa value is adjusted before running harpconvert to satisfy all of the following criteria:

• ozone_total_vertical_column in [0, 0.45]
• ozone_effective_temperature in [180, 260]
• fitted_root_mean_square > 0.01

Example harpconvert invocation: harpconvert --format hdf5 --hdf5-compression 9 -a 'O3_column_number_density_validity>50;derive(datetime_stop {time}); bin_spatial(2001, 50.000000, 0.01, 2001, -120.000000, 0.01); keep(O3_column_number_density,O3_column_number_density_amf, O3_slant_column_number_density,O3_effective_temperature,cloud_fraction, sensor_azimuth_angle,sensor_zenith_angle,solar_azimuth_angle, solar_zenith_angle)' S5P_NRTI_L2__O3_____20180710T230038_20180710T230538_03840_01_010000_20180711T005227.nc output.h5

• Assets between the dates 2018-07-10 and 2018-07-18 are missing due to non-standard structure of product files.

Bands

Resolution
1113.2 meters

Bands

Name	Units	Min	Max	Description
O3_column_number_density	mol/m^2	0.0047*	0.272*	Total atmospheric column of O3 between the surface and the top of atmosphere, calculated with the DOAS algorithm.
O3_column_number_density_amf	mol/m^2	1.92*	6.83*	Weighted mean of cloudy and clear air mass factor (amf) weighted by intensity-weighted cloud fraction.
O3_slant_column_number_density	mol/m^2	0.014*	1.402*	O3 ring corrected slant column number density
O3_effective_temperature	K	-5962*	936*	Ozone cross section effective temperature
cloud_fraction	Fraction	0*	1*	Effective cloud fraction. See the Sentinel 5P L2 Input/Output Data Definition Spec, p.220.
sensor_azimuth_angle	deg	-180*	180*	Azimuth angle of the satellite at the ground pixel location (WGS84); angle measured East-of-North.
sensor_zenith_angle	deg	0.098*	66.44*	Zenith angle of the satellite at the ground pixel location (WGS84); angle measured away from the vertical.
solar_azimuth_angle	deg	-180*	180*	Azimuth angle of the Sun at the ground pixel location (WGS84); angle measured East-of-North.
solar_zenith_angle	deg	8*	80*	Zenith angle of the satellite at the ground pixel location (WGS84); angle measured away from the vertical.

* estimated min or max value

Image Properties

Image Properties

Name	Type	Description
ALGORITHM_VERSION	STRING	The algorithm version used in L2 processing. It is separate from the processor (framework) version, to accommodate different release schedules for different products.
BUILD_DATE	STRING	The date, expressed as milliseconds since 1 Jan 1970, when the software used to perform L2 processing was built.
HARP_VERSION	INT	The version of the HARP tool used to grid the L2 data into an L3 product.
INSTITUTION	STRING	The institution where data processing from L1 to L2 was performed.
L3_PROCESSING_TIME	INT	The date, expressed as milliseconds since 1 Jan 1970, when Google processed the L2 data into L3 using harpconvert.
LAT_MAX	DOUBLE	The maximum latitude of the asset (degrees).
LAT_MIN	DOUBLE	The minimum latitude of the asset (degrees).
LON_MAX	DOUBLE	The maximum longitude of the asset (degrees).
LON_MIN	DOUBLE	The minimum longitude of the asset (degrees).
ORBIT	INT	The orbit number of the satellite when the data was acquired.
PLATFORM	STRING	Name of the platform which acquired the data.
PROCESSING_STATUS	STRING	The processing status of the product on a global level, mainly based on the availability of auxiliary input data. Possible values are "Nominal" and "Degraded".
PROCESSOR_VERSION	STRING	The version of the software used for L2 processing, as a string of the form "major.minor.patch".
PRODUCT_ID	STRING	Id of the L2 product used to generate this asset.
PRODUCT_QUALITY	STRING	Indicator that specifies whether the product quality is degraded or not. Allowed values are "Degraded" and "Nominal".
SENSOR	STRING	Name of the sensor which acquired the data.
SPATIAL_RESOLUTION	STRING	Spatial resolution at nadir. For most products this is 3.5x7km2, except for L2__O3__PR, which uses 28x21km2, and L2__CO____ and L2__CH4___, which both use 7x7km2. This attribute originates from the CCI standard.
TIME_REFERENCE_DAYS_SINCE_1950	INT	Days from 1 Jan 1950 to when the data was acquired.
TIME_REFERENCE_JULIAN_DAY	DOUBLE	The Julian day number when the data was acquired.
TRACKING_ID	STRING	UUID for the L2 product file.
STATUS_MET_2D	STRING	This dataset uses dynamic auxiliary weather data during L2 processing. This field has a value of "Nominal" if ECMWF dynamic auxiliary data was available or "Fallback" if not.

Terms of Use

Terms of Use

The use of Sentinel data is governed by the Copernicus Sentinel Data Terms and Conditions.

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Code Editor (JavaScript)

var collection = ee.ImageCollection('COPERNICUS/S5P/NRTI/L3_O3')
  .select('O3_column_number_density')
  .filterDate('2019-06-01', '2019-06-05');

var band_viz = {
  min: 0.12,
  max: 0.15,
  palette: ['black', 'blue', 'purple', 'cyan', 'green', 'yellow', 'red']
};

Map.addLayer(collection.mean(), band_viz, 'S5P O3');
Map.setCenter(0.0, 0.0, 2);

Open in Code Editor

Sentinel-5P NRTI O3: Near Real-Time Ozone

NRTI/L3_O3 This dataset provides near-real-time high-resolution imagery of total column ozone concentrations. See also COPERNICUS/S5P/OFFL/L3_O3_TCL for the tropospheric column data. In the stratosphere, the ozone layer shields the biosphere from dangerous solar ultraviolet radiation. In the troposphere, it acts as an efficient cleansing agent, but at high concentration it also …

COPERNICUS/S5P/NRTI/L3_O3, air-quality,copernicus,esa,eu,o3,ozone,pollution,s5p,sentinel,tropomi

2018-07-10T11:02:44Z/2024-12-19T08:40:07Z

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