Table 2: Isoprene and monoterpene surface concentrations (in pptv) in the marine boundary layer Comparison between observations and TM4-ECPL monthly mean model results in the corresponding 4°6° (latitude longitude) model grid.

Location Month Model (pptv) Observations (pptv) Reference Isoprene N. Atlantic Ocean Jul. 2004 0.06 [56] Norwegian Sea Aug. 1999 2.4 [57] NW Pacific Ocean May 2001 2.5 7.2–110 [58] Indian Ocean (50°S–20°S & 50°E–80°E) Dec. 2004 2–9 20–340 [59] Southern Ocean* (69°S, 39°E–45°S, 105°E) Dec. 1997 1.4 13 ( 0.1–57) [60] Straits of Florida (24°N, 80°W) Sep. 1993 127 5–11 [61] Hao atoll (18°S, 140°W) Jun. 1990 0.6 2 [12] Syowa Station (69°S, 39°E) Dec. 1997 0.2 0.1–57 [60] Southern Ocean Jan.-Feb. 2007 10.4 26–187* [15] Monoterpenes Southern Ocean Jan.-Feb. 2007 * [15] Indian Ocean (50°S–20°S & 50°E–80°E) Dec. 2004 23 [59]

*Range of average observations for far away before the bloom and in situ bloom cases, 35° S, 20° E to 52° S, 67°W.