Global ~25km GEOS GMI Modeling to Support the Multi-Decadal Nitrogen Dioxide and Derived Products from Satellites (MINDS) Project

Abstract:

Satellite hyperspectral measurements from Ultraviolet-Visible (UV-Vis) spectrometers have provided a long record over two and half decades for important atmospheric gaseous constituents like Nitrogen Dioxide (NO₂) and their trends. The nadir-viewing spectrometers have increased their horizontal resolution considerably, however have limited vertical information content. These nadir-viewing measurements require model supplied a-priori NO₂ profile shapes to convert satellite observed slant column densities to vertical column densities. The Multi-Decadal Nitrogen Dioxide and Derived products from Satellites (MINDS) is a MEaSUREs project to develop a consistent long-term multi-satellite global trend-quality climate data record of tropospheric and stratospheric NO₂ columns. One aspect of this work is to produce consistent a-priori NO₂ profiles and ancillary information from a single high-resolution global chemistry model for multiple UV-Vis instruments from 1995 to present. Here, we use the Goddard Earth Observing System (GEOS) model coupled to the Global Modeling Initiative (GMI) stratospheric and tropospheric chemical mechanism using the “replay” framework to constrain the dynamics using MERRA-2 reanalysis. This simulation of over 25 years is performed at C360 (~25km) resolution on the cubed sphere, output at 0.25° longitude by 0.25° latitude. The simulation also includes a satellite instrument swath sampler, using two-line element (TLE) orbital files, to sample the model at its native vertical resolution at the same longitude, latitude, and time as each instrument measurement. In addition to NO₂, the satellite instrument swath output includes O₃, CH₂O, SO₂, and other UV/Vis constituents. Our MINDS work focuses on the Global Ozone Monitoring Experiment (GOME, 1995 – 2003), SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY, 2002 – 2012), Ozone Monitoring Instrument (OMI, 2004 – current), and the GOME-2 (2006 – current) instrument series with further extensions included to SNPP and NOAA-20 Ozone Mapping Profiler Suite (OMPS, 2011 – current) and TROPOspheric Monitoring Instrument (TROPOMI, 2017 – current). We will present an overview of this simulation, the satellite sampling output, and our evaluation against satellite and suborbital missions.