TROPESS CrIS-SNPP L2: Atmospheric Gas Profiles Over Karachi

From 2016-01-02 to 2021-05-21, this dataset provides the vertical distribution of six atmospheric gases (CH4, CO, HDO, NH3, O3, PAN) and their uncertainties. Measurements are from the CrIS instrument on the Suomi-NPP satellite, processed by the NASA TROPESS project's MUSES algorithm. Data are reported daily at 17 vertical levels from the surface to 0.1 hPa over a 2x2 degree region centered on Karachi.

Use Cases

• Analyzing vertical pollutant gradients over Karachi based on 17 reported atmospheric levels.
• Tracking temporal trends of methane (CH4) and ozone (O3) concentrations from 2016 to 2021.
• Assessing satellite-derived ammonia (NH3) emissions for urban air quality modeling.
• Comparing formal uncertainties for different gas retrievals to evaluate measurement reliability.
• Investigating spatial patterns of carbon monoxide (CO) within the 14 km resolution nadir footprints.

Strengths

• Provides a multi-year time series (over 5 years) for a consistent geographic region.
• Contains vertical profiles at 17 specific levels, offering detailed atmospheric structure.
• Includes formal uncertainties for each retrieved gas, supporting quantitative analysis.
• Uses a specialized optimal estimation algorithm (MUSES) for multi-species retrieval.

Limitations

• Row count, file size, and exact column structure are unknown across all sources.
• The license is ambiguously listed as 'other-license-specified' without further detail.
• Data coverage ends in May 2021, limiting analysis of recent atmospheric conditions.

Provenance

Source

NASA TROPESS project, GES DISC, Principal Investigator Kevin W. Bowman.

Collection Method

Satellite remote sensing data from the CrIS instrument on Suomi-NPP, processed with the MUSES optimal estimation algorithm.

Time Range

2016-01-02 to 2021-05-21

Freshness

2026-04-09 21:21:51.342279

Geography

A 2x2 degree region centered on Karachi, Pakistan.