J3.6 Influence of wind speeds on flux exchange across water-atmosphere interface under different stability conditions

Tuesday, 21 June 2016: 2:45 PM
Arches (Sheraton Salt Lake City Hotel)
Yusri Yusup, Universiti Sains Malaysia, USM, Pulau Pinang, Malaysia; and H. Liu

Handout (7.5 MB)

Understanding air-water interactions of inland water bodies, such as lakes and reservoirs, is critical to ascertain the role inland water bodies have in regulating local and regional weather and its impact to the hydrological balance. Wind is one of the important regulators of energy exchange between the atmosphere and water bodies. By separating the dataset in four wind-class days (I to IV, where IV is the highest wind speed class day), we found that an increase in persistent wind speed conditions at the diurnal scale would increase the correlation between LE (H) and Δe (ΔT). LE (H) was found to have stronger linear relationships with Δe (ΔT) with increasing wind-class days, particularly after wind-class day III. The bulk transfer coefficients behaved similarly in all wind speed and atmospheric stability conditions and so did not influence the relationships between LE (H), Δe (ΔT) and UΔe (UΔT). Correlations between UΔe or UΔT and LE or H would increase when persistent wind speed conditions exist because of the increased interaction between U and Δe or U and ΔT. Persistent wind conditions and atmospheric stability also enhanced the role of Δe and ΔT on LE and H, respectively. In wind-class day IV and under unstable conditions, LE was greatly influenced by Δe; in contrast, LE was suppressed under stable conditions even though Δe was elevated. Similarly, under unstable conditions, H was more affected by ΔT than under stable conditions.
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