Mapping hydroxyl variability throughout the global remote troposphere via synthesis of airborne and satellite formaldehyde observations.

摘要: The hydroxyl radical (OH) fuels tropospheric ozone production and governs the lifetime of methane many other gases. Existing methods to quantify global OH are limited annual global-to-hemispheric averages. Finer resolution is essential for isolating model deficiencies building process-level understanding. In situ observations from Atmospheric Tomography (ATom) mission demonstrate that remote tightly coupled loss formaldehyde (HCHO), a major hydrocarbon oxidation product. Synthesis this relationship with satellite-based HCHO retrievals model-derived frequencies yields map total-column abundance throughout troposphere (up 70% mass) over first two ATom missions (August 2016 February 2017). This dataset offers unique insights on near-global oxidizing capacity. exhibits significant seasonality within individual hemispheres, but domain mean concentration nearly identical both seasons (1.03 ± 0.25 × 106 cm−3), biseasonal average North/South Hemisphere ratio 0.89 0.06, consistent balance sources sinks across troposphere. Regional phenomena also highlighted, such as 10-fold depression in Tropical West Pacific enhancements East South Atlantic. method complementary budget-based constraints can help elucidate spatial temporal variability loss.