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NUMERICAL SIMULATION OF INTERPLAY BETWEEN ECOSYSTEM AND THE ASIAN MONSOON CLIMATE
Jinkyu HONG,Kyung-Hee SEOL,Younghwa BYUN,Chunho CHO,Taeyoung HA,Joon KIM 한국산업응용수학회 2010 한국산업응용수학회 학술대회 논문집 Vol.5 No.2
The monsoon system is an important natural driver of ecosystem carbon and water exchanges in Asia and is being altered by anthropogenic forcings. This system is accompanied by heavy rainfall and typhoons in the main growing season, thus causing alterations of environmental conditions such as rainfall, wind, and temperature; therefore, it acts as a natural disturbance to forests in Asia. Therefore, degradation of ecosystem service by monsoon activity reinforced by anthropogenic factors in a changing climate is of great concern. In this study, we presented observational evidences for the interplay of terrestrial carbon and water dynamics with the Asian monsoon and their implication in ecosystem modeling. Our analysis showed strong coupling between ecosystem functioning and temporal variations of monsoon climate. Further scrutiny on the model outputs showed that the model did not accurately reproduce the observed plant phenology and thus ecosystem carbon and water exchanges disturbed by monsoon activities. Our findings suggest that under projected climate scenarios, terrestrial carbon sinks in monsoon Asia will decline if the monsoon disturbance will exceed its natural range of variation and if there is no enhancement in the robustness of the ecosystem in this region.
Changes in the Seoul Metropolitan Area Urban Heat Environment with Residential Redevelopment
Hong, Je-Woo,Hong, Jinkyu AMERICAN METEOROLOGICAL SOCIETY 2016 JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY Vol.55 No.5
<P>Since the Industrial Revolution, the geographical extent of cities has increased around the world. In particular, following three decades of rapid regional economic growth, many Asian megacities have emerged and continue to expand, resulting in inevitable short-term urban redevelopment. In this region, the microclimatic impacts of urban redevelopment have not been extensively investigated using long-term in situ observations. In this study, changes in surface sensible heat exchange, heat storage, and anthropogenic heat emissions that are due to urban residential redevelopment were quantified and analyzed on the basis of a 3-yr micrometeorological record from the Seoul, South Korea, metropolitan area. The results show that, following urban redevelopment of compact high-rise residential buildings, 1) the daily minimum air temperature near the ground surface increased by; similar to 0.6 K; 2) the ratio between surface sensible heat and net radiation increased by from; similar to 9% (summer) to 31% (winter), anthropogenic heat emissions increased by from 7.6 (summer) to 23.6 (spring) Wm(-2), and daily maximum heat storage ranged from 35.1 (spring) to 54.5 (summer) Wm(-2); and 3) there was a transition of local circulation with changes in the surface properties of heat sources and roughness.</P>
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
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.
HONG, JINKYU,KIM, JOON Blackwell Publishing Ltd 2011 Global change biology Vol.17 No.5
<P><B>Abstract</B></P><P>The monsoon system is an important natural driver of ecosystem carbon and water exchanges in Asia and is being altered by anthropogenic forcings. This system is accompanied by heavy rainfall and typhoons in the main growing season, thus causing alterations of environmental conditions such as rainfall, wind, and temperature; therefore, it acts as a natural disturbance to forests in Asia. Therefore, degradation of ecosystem service by monsoon activity reinforced by anthropogenic factors in a changing climate is of great concern. In this study, we presented observational evidences for the interplay of terrestrial carbon and water dynamics with the Asian monsoon and their implication in ecosystem modeling. We analyzed 3‐year eddy‐covariance data at a temperate deciduous forest in Korea. We used wavelet power and coherence spectra to investigate the Asian monsoon system and to determine its impact on the ecosystem. During the study period, our analysis showed strong coupling between ecosystem functioning and temporal variations of monsoon climate. Further scrutiny on the model outputs showed that the model did not accurately reproduce the observed plant phenology and thus ecosystem carbon and water exchanges disturbed by monsoon activities. Our findings suggest that under projected climate scenarios, terrestrial carbon sinks in monsoon Asia will decline if the monsoon disturbance will exceed its natural range of variation and if there is no enhancement in the robustness of the ecosystem in this region.</P>