View all of the Antarctic Hemisphere monthly-mean maps of total ozone for April. Satellite instruments monitor the ozone layer, and we use their data to create the images that depict the amount of ozone.

Click any map image to bring up a new page with a high-resolution map.

Animations

	360x240		720x486		1280x720	1920x1080
April	mp4	mpg	mp4	mpg	mp4	mp4

Data source

The data for 1979–1993 are from the TOMS instrument on the NASA/NOAA Nimbus-7 satellite.

The data for 1994 are from the TOMS instrument on the Soviet-built Meteor-3 satellite.

The data for 1997–2004 are from the NASA Earth Probe TOMS satellite.

The data for 2005–2016 are from the OMI instrument (KNMI / NASA) onboard the Aura satellite. They are the OMTO3d (Global Ozone Data) data.

The data for 2017–2018 are from the OMPS instrument onboard the Suomi NPP satellite.

Missing areas (bad orbits and polar night) are filled using assimilated ozone data from the Modern-Era Retrospective analysis for Research and Applications (MERRA and Version 2 (MERRA-2) assimilations, produced by the Goddard Earth Observing System Data Assimilation System (GEOS DAS). MERRA and MERRA-2 use a version of the GEOS model with the Gridpoint Statistical Interpolation (GSI) atmospheric analysis developed jointly with NOAA/NCEP/EMC. Data are also filled using the GEOS FP data are produced by the Goddard Earth Observing System data assimilation system (DAS). The GEOS FP system integrates forefront versions of the GEOS atmospheric general circulation model with advanced data assimilation techniques, using a broad range of satellite observations.

Bulk access

The following links will provide you with bulk access to the images, animations, and raw satellite data.

- Images
- Movies
- Data: TOMS Nimbus-7
- local
- ozoneaq (Nimbus-7 - Daily Gridded Ozone)
- Data: TOMS Meteor-3
- local
- ozoneaq (Meteor-3 - Daily Gridded Ozone)
- Data: Earth Probe TOMS
- local
- ozoneaq (Earth Probe - Daily Gridded Ozone)
- Data: Aura OMI
- local
- ozoneaq (Global Ozone Data)
- Data: NPP OMPS
- local
- ozoneaq (NMTO3-L3-DAILY-UVAerosolindex-ASCII)

April

Palette relating map colors to ozone values

<March

May>

The false-color view of the monthly-averaged total ozone over the Antarctic pole. The blue and purple colors are where there is the least ozone, and the yellows and reds are where there is more ozone.

Monthly-mean maps

Missing years are indicated with a plain gray globe.


									1979

1980	1981	1982	1983	1984	1985	1986	1987	1988	1989

1990	1991	1992	1993	1994	1995	1996	1997	1998	1999

2000	2001	2002	2003	2004	2005	2006	2007	2008	2009

2010	2011	2012	2013	2014	2015	2016	2017	2018	2019

2020	2021	2022	2023	2024