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Dew plagues crop producers in many facets of agriculture. Many studies have been done on the effects of dew in terms of pest infestation and disease development on crops. The presence of intercepted precipitation and dew has been found to decrease the microwave brightness temperature of corn at the plot-scale, which in turn affects soil moisture readings. Although the formation of dew is significant on amicro-scale, satellite remote sensing instruments such as the European Space Agency's Soil Moisture and Ocean Salinity (SMOS) mission aim to measure soil moisture on a meso or synoptic scale. The purpose of the dew collection portion of the Soil Moisture EXperiment in 2005 (SMEX05) was to manually measure dew so that this effect could be studied on measurements at the field scale made by remote sensing instruments on an aircraft . The use of physical models for atmosphere-land interactions can provide a great benefit to remote satellite measurements of soil moisture. Although direct measurements of dew are important, spatial coverage of manual measurements are minimal. Land-atmosphere transfer models, validated by manual measurements, must be used at the satellite scale. The purpose of this paper is to determine whether manual dew measurements obtained during SMEX05 are accurately modeled by the Atmosphere-Land EXchange model, ALEX. Dew measurements were taken during SMEX05 from June 16 t0 July 3, 2005 in corn (Zea malts, L.), soybean (Glgcine max, L.), and alfalfa (Medicago sativa, L.) fields south of Ames, Iowa. Collection usually began at approximately 5:45 Central Standard Time (CST) and concluded at approximately 8:00 CST each morning. My hypothesis was that dew amount and duration collected from SMEX05 are accurately predicted by the ALEX model. Accuracy for dew amount is defined as an amount within 0.05 to 0.1 mm of manual measurements. Accuracy for dew duration is defined as 0.5 hours within

Dew duration and amount on corn leaves as determined from measurements during SMEX05 and simulation using the ALEX model