Satellite isoprene retrievals constrain emissions and atmospheric oxidation

Article

关键词: ORGANIC AEROSOL FORMATION;    FORMALDEHYDE COLUMNS;    HYDROCARBON EMISSIONS;    AIRCRAFT CAMPAIGN;    UNITED-STATES;    FORMIC-ACID;    MODEL;    OZONE;    OMI;    CLIMATE;   

DOI  :  10.1038/s41586-020-2664-3

来源: SCIE

【 摘 要 】

Isoprene is the dominant non-methane organic compound emitted to the atmosphere(1-3). It drives ozone and aerosol production, modulates atmospheric oxidation and interacts with the global nitrogen cycle(4-8). Isoprene emissions are highly uncertain(1,9), as is the nonlinear chemistry coupling isoprene and the hydroxyl radical, OH-its primary sink(10-13). Here we present global isoprene measurements taken from space using the Cross-track Infrared Sounder. Together with observations of formaldehyde, an isoprene oxidation product, these measurements provide constraints on isoprene emissions and atmospheric oxidation. We find that the isoprene-formaldehyde relationships measured from space are broadly consistent with the current understanding of isoprene-OH chemistry, with no indication of missing OH recycling at low nitrogen oxide concentrations. We analyse these datasets over four global isoprene hotspots in relation to model predictions, and present a quantification of isoprene emissions based directly on satellite measurements of isoprene itself. A major discrepancy emerges over Amazonia, where current underestimates of natural nitrogen oxide emissions bias modelled OH and hence isoprene. Over southern Africa, we find that a prominent isoprene hotspot is missing from bottom-up predictions. A multi-year analysis sheds light on interannual isoprene variability, and suggests the influence of the El Nino/Southern Oscillation.

【 授权许可】

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