| Summary: | Chemical denudation rates and carbon dioxide withdrawal were calculated for the Londonelva basin, an ice‐free karst catchment on Svalbard. Runoff was recorded 12 June to 11 October 2000 and water samples were collected daily in August. The chemical denudation rate that month amounted to 2.2 m3 km−2. The estimated chemical denudation rate for 2000 was 5.8 m3 km−2 yr−1 or 303 Σ meq+ m−2 yr−1, but this rate may be unusually low because basin runoff was only 158 × 103 m3, the lowest since recording began in 1992. For other discharge years estimated chemical denudation rates range from 5.8 to 13.3 m3 km−2 yr−1 or 300–690 Σ meq+ m−2 yr−1. The CO2 withdrawal in August 2000 amounted to 560 kg C km−2 and for the hydrological year 2000 it was 1560 kg C km−2 yr−1. In 1993, the highest recorded runoff year, withdrawal of CO2 may have reached 3800 kg C km−2 yr−1. Copyright © 2007 John Wiley & Sons, Ltd.
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