Processes controlling dimethylsulfide over the ocean: Case studies using a 3-D model driven by assimilated meteorological fields ...

• Main Authors: Chin, Mian, Rood, Richard B., Allen, Dale J., Andreae, Meinrat O., Thompson, Anne M., Lin, Shian-Jiann, Atlas, Robert M., Ardizzone, Joseph V.
• Format: Text
• Language: English
• Published: AGU 1998
• Subjects: Amsterdam Island
• Online Access: https://dx.doi.org/10.13016/m2y2bb-c8bi; https://mdsoar.org/handle/11603/34980

This study investigates the processes that influence dimethylsulfide (DMS) concentrations over the ocean using a global three-dimensional chemistry and transport model (CTM). The model is driven by assimilated meteorological data from the Goddard Earth Observing System Data Assimilation System (GEOS-I DAS). Results from the model are compared with DMS measurements from two marine sites, a ship cruise, and an aircraft campaign. When observed seawater DMS concentrations and meteorological conditions are used, the model reproduces the observed daily and diurnal variations of DMS concentrations at a tropical Pacific station. The model also predicts the observed changes of DMS concentrations across the Atlantic, although it overestimates the DMS level by a factor of 2. The calculated vertical DMS concentrations off Tasmania are more than 4 times higher than the measured data. The model simulates day-to-day fluctuations and interannual variations observed at Amsterdam Island but underpredicts the magnitude of the ...