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1
Impact of Large-Scale Advection on Regional Heat Flux Estimation over Patchy Agricultural Land

Jinkyu Hong,Chunho Cho,Tae-Young Lee,Monique Leclerc 한국기상학회 2009 Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.2
- 원문보기
- 복사/대출신청
This paper attempted to constrain regional heat fluxes simulated by an atmospheric mesoscale model using the convective boundary layer (CBL) budget method and flux tower data over a mosaic of farmland. In tower footprint scales, the mesoscale model reproduced heat fluxes comparable to the tower measurement. In regional scales, the modeled heat fluxes were consistent with those from the CBL budget method only when the advection inside the CBLwas considered. Our analysis showed that the advection in the CBL, in conjunction with sealand breeze and heat transport from the inland, played a critical role in estimating regional scale fluxes since the net change of temperature in the CBL was balanced with entrainment in the CBL budget method. However, inconsistent magnitudes and pattern of advection between the model and the CBL budget method hindered us from inferring reliable regional heat fluxes around the site.
2
Response of Ecosystem Carbon and Water Vapor Exchanges in Evolving Nocturnal Low-Level Jets

Hong, Jin-Kyu,Mathieu, Nathalie,Strachan, Ian B.,Pattey, Elizabeth,Leclerc, Monique Y. Korean Society for Atmospheric Environment 2012 Asian Journal of Atmospheric Environment (AJAE) Vol.6 No.3
- 원문보기
The nocturnal low-level jet makes a significant impact on carbon and water exchanges and turbulent mixing processes in the atmospheric boundary layer. This study reports a case study of nocturnal surface fluxes such as $CO_2$ and water vapor in the surface layer observed at a flat and homogeneous site in the presence of low-level jets (LLJs). In particular, it documents the temporal evolution of the overlying jets and the coincident response of surface fluxes. The present study highlights several factors linking the evolution of low-level jets to surface fluxes: 1) wavelet analysis shows that turbulent fluxes have similar time scales with temporal scale of LLJ evolution; 2) turbulent mixing is enhanced during the transition period of low-level jets; and 3) $CO_2$, water vapor and heat show dissimilarity from momentum during the period. We also found that LLJ activity is related not only to turbulent motions but also to the divergence of mean flow. An examination of scalar profiles and turbulence data reveal that LLJs transport $CO_2$ and water vapor by advection in the stable boundary layer, suggesting that surface fluxes obtained from the micrometeorological method such as nocturnal boundary layer budget technique should carefully interpreted in the presence of LLJs.
3
Response of Ecosystem Carbon and Water Vapor Exchanges in Evolving Nocturnal Low-Level Jets

홍진규,Nathalie Mathieu,Ian B. Strachan,Elizabeth Patte,Monique Y. Leclerc 한국대기환경학회 2012 Asian Journal of Atmospheric Environment (AJAE) Vol.6 No.3
- 원문보기
The nocturnal low-level jet makes a significant impact on carbon and water exchanges and turbulent mixing processes in the atmospheric boundary layer. This study reports a case study of nocturnal surface fluxes such as CO2 and water vapor in the surface layer observed at a flat and homogeneous site in the presence of low-level jets (LLJs). In particular, it documents the temporal evolution of the overlying jets and the coincident response of surface fluxes. The present study highlights several factors linking the evolution of low-level jets to surface fluxes: 1) wavelet analysis shows that turbulent fluxes have similar time scales with temporal scale of LLJ evolution; 2)turbulent mixing is enhanced during the transition period of low-level jets; and 3) CO2, water vapor and heat show dissimilarity from momentum during the period. We also found that LLJ activity is related not only to turbulent motions but also to the divergence of mean flow. An examination of scalar profiles and turbulence data reveal that LLJs transport CO2 and water vapor by advection in the stable boundary layer,suggesting that surface fluxes obtained from the micrometeorological method such as nocturnal boundary layer budget technique should carefully interpreted in the presence of LLJs.