Version Update Notice: Upgraded MLS NRT Version 5.0 dataset is now available. This upgrade uses an artificial neural network (ANN) approach (trained on the v5 MLS standard product dataset) to estimate the NRT temperature, water vapor, ozone, carbon monoxide, sulfur dioxide, nitric acid, and nitrous oxide profiles using radiances from the nearest limb scan. The data file will have the same data format and structure as the existing files.
Note: The updated version is only available in a forward processing stream; older data will not be routinely re-processed. More information is available in the Upgraded Version 5 dataset section below.
MLS NRT Data and Information
The Microwave Limb Sounder (MLS) instrument aboard NASA’s Aura satellite makes measurements of atmospheric composition, temperature, humidity, and cloud ice. MLS near real-time (NRT) data are available through LANCE generally within 45 to 140 minutes after a satellite observation.
To download MLS data, register for an Earthdata Login. Use the table below to access specific LANCE data products.
MLS / Aura - Collection 5
|Product Download||Description||Volume (GB/day)||Browse|
|ML2CO_NRT.005||Carbon Monoxide (CO) MLS/Aura NRT L2 CO Mixing Ratio||0.03||N/A|
|ML2H2O_NRT.005||Water Vapor (H2O) MLS/Aura NRT L2 H2O Mixing Ratio||0.03||N/A|
|ML2HNO3_NRT.005||Nitric Acid (HNO3) MLS/Aura NRT L2 HNO3 Mixing Ratio||0.03||N/A|
|ML2N2O_NRT.005||Nitrous Oxide (N2O) MLS/Aura NRT L2 N2O Mixing Ratio||0.03||N/A|
|ML2O3_NRT.005||Ozone (O3) MLS/Aura NRT L2 O3 Mixing Ratio||0.03||N/A|
|ML2SO2_NRT.005||Sulfur Dioxide (SO2) MLS/Aura NRT L2 SO2 Mixing Ratio||0.02||N/A|
|ML2T_NRT.005||Temperature MLS/Aura NRT L2 Temperature||0.03||N/A|
Upgraded Version 5 dataset
This upgrade uses an artificial neural network (ANN) approach (trained on the v5 MLS standard product dataset) to estimate the NRT temperature, water vapor, ozone, carbon monoxide, sulfur dioxide, nitric acid, and nitrous oxide profiles using radiances from the nearest limb scan. (The team had previously considered discontinuing the nitrous oxide and nitric acid products, but they remain in this dataset release.) The networks were trained on 75% of the valid v5 MLS standard temperature product retrievals between January 2005 and August 2022 and their associated, nearest radiance profiles. The ANN processed results were validated using the remaining 25% of profiles. As the MLS v5.0 standard products are used as "truth" in the training, the best-case output of the ANN is a computationally-inexpensive, high-fidelity preview of the v5.0 standard-production profiles.
Note that the version 5 NRT data is only available in a forward processing stream and that older data will not be routinely re-processed.
An overview of the Aura MLS NRT products and comparison with the MLS standard data products is given in an updated v5 NRT data user guide.
Users are urged to read the MLS v5.0-NRT user guide and encouraged to contact the MLS science team (firstname.lastname@example.org) with any questions.
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