A tale of two near-term climate forcers: black carbon and methane Daniel J. Jacob with Qiaoqiao...

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Multimodel intercomparison and comparison to observations Multimodel intercomparisons and comparisons to observations Koch et al. [2009], Schwarz et al. [2010] BC, ng kg -1 TC4 (Costa Rica, summer) Observed Models Large overestimate must reflect model errors in scavenging Free tropospheric BC in AeroCom models is ~10x too high Pressure, hPa obs models 60-80N obs models 20S-20N Pressure, hPa HIPPO over Pacific (Jan) BC, ng kg -1 This has major implications for IPCC radiative forcing estimates

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