Progress in development of Tropospheric Infrared Mapping Spectrometers (TIMS): geoCARB green house gas (GHG) application

摘要

We review development of the TIMS beginning in the early part of the decade and up to preliminary results of work in progress. We describe a geostationary application (geoCARB) at near PDR maturity for mapping CO2, CH4 and CO column mixing ratios on continental scale areas (e.g., Australia and East Asia) several times per day on contiguous samples with spacing the order 3 km at the sub satellite point. Measurements per footprint are expected to be acquired with median mission SNRs » 300, 300 and 240 in the traditional spectral regions (e.g., OCO and TANSO-FTS on GOSAT) for CO2, namely the O2 A-band, and the weak and strong bands of CO2 near 1.61 and 2.06 microns; and » 200 in a region near 2.32 microns for CO and CH4.The resolving powers are 15000, 15000, 11000 and 11000 in the 4 regions, respectively. Given this performance the median mission retrieval for CO2, CH4 and CO column mixing ratio is expected to be considerably better than 0.7, 1.0 and 10.0%, respectively. These measurements over several years would provide a break through reduction in the uncertainty for the sources of CO2 and CH4 within the large geostationary field of regard of the geoCARB, and the CO measurement would assist in source attribution.