Glyoxal vertical columns from GOME-2 backscattered light measurements and comparisons with a global model
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"Glyoxal vertical columns from GOME-..." refers background in this paper
...…columns are corroborated by the first shipbased measurements in the marine boundary layer of the remote tropical Pacific (Volkamer et al., 2010; Sinreich et al., 2010) also reporting very high glyoxal mixing ratios (up to 140 pptv), for which no convincing interpretation is available at this…...
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..., 2010; Sinreich et al. , 2010). Assuming a uniform glyoxal concentration in the marine boundary layer (z <700 m, based on ECMWF analyses), the vertical column densities corresponding to these ship measurements reach 3 ×1014 molec/cm2, consistent with our glyoxal observations from GOME-2 and those from SCIAMACHY (Vrekoussis et al. , 2009). The causes for these high glyoxal abundances are still unknown. Typical known glyoxal precursors emitted over land are too short-lived to significantly contribute to such high glyoxal concentrations in remote oceans ( Sinreich et al. , 2010). However, the transport of (still unidentified) continental glyoxal precursors to oceanic regions cannot be totally excluded. Alternatively, as proposed byVrekoussis et al.(2009), organic aerosols released from the sea might be oxidized in the boundary layer into gas-phase organic compounds....
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...Typical known glyoxal precursors emitted over land are too short-lived to significantly contribute to such high glyoxal concentrations in remote oceans (Sinreich et al., 2010)....
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...Recently, ship measurements conducted in the Tropical Pacific Ocean using a MAX-DOAS instrument have clearly indicated elevated glyoxal concentrations in the marine boundary layer (Volkamer et al., 2010; Sinreich et al., 2010)....
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