Impact of horizontal spatial resolution on the derivation of the source–receptor relationship—an extra-tropical cyclone case

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Lee, Jae-Bum ; Lee, Tae-Young (2011)

A numerical study has been made to evaluate the impact of horizontal resolution on the estimation of the source–receptor (S–R) relationship. Numerical experiments with four different horizontal grid sizes have been performed for anextra-tropical cyclonic episode in East Asia. CSU RAMS and YU-SADM (Yonsei University’s sulfuric acid depositionmodel) have been used to simulate meteorological and pollutant fields, respectively.In this study, enhanced spatial resolution has improved the simulation of an extra-tropical cyclone, cold front andassociated precipitation systems. As spatial resolution increases, the circulation associated with the cyclone and coldfront becomes stronger, and the amount of frontal rainfall increases. This study has shown that enhancement of spatialresolution tends to increase self-contributions but decrease foreign contributions to the wet deposition associated with anextra-tropical cyclone. It has been found that increased precipitation for enhanced spatial resolution reduces the amountof transported pollutant but increases the wet deposition of locally emitted pollutants. The larger self-contribution forhigher resolutions may also be partially due to the increased strength of resolved convection. The impact of enhancingspatial resolution on dry deposition is felt mostly over downstream regions where the centres of the lows and frontspass. Contributions from upstream sources increase as cyclonic circulation becomes stronger with increasing spatialresolution. On the other hand, enhancing spatial resolution does not significantly affect the S–R relationship for eitherdry or wet deposition in the other regions where the extra-tropical cyclone does not pass. This study indicates thatimproved simulation of a cold front does not significantly affect the S–R relationship for wet deposition over the areaof passage of the cold front. An additional discussion infers a S–R relationship for the wet deposition associated with atypical extra-tropical cyclone.OI: 10.1111/j.1600-0889.2004.00123.x
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