홍진규 교수

연속적인 지표 플럭스 관측으로부터 축적되는 엄청난 양의 자료를 체계적으로 처리분석하고 종합하여 일관성 있는 결과를 도출해 내려면 에디 공분산 자료 처리 방법의 표준화가 우선되어야 한다. 이 논문에서는 국내 타워 플럭스 관측 네트워크인 KoFlux의 표준화된 자료 처리 방법을 소개하고, 처리 방법이 다른 경우에 생길 수 있는 지표 플럭스의 불확실성을 평가하였다. 광릉 활엽수림에서 관측된 탄소 플럭스의 경우, 순생태계교환량(net ecosystem exchange, NEE)과 생태계호흡량(ecosystem respiration, Re)은 각각 자료 처리 방법의 차이에 따라 민감한 반응을 보였다. 그러나 두 양이 서로 상쇄되어, 총일차생산량(gross primary productivity, GPP=NEE+Re)은 자료 처리 방법이 다른 경우에도 불구하고 오차 범위 내에서 일치하였다. 이러한 결과는 GPP를 산출할 때에 Re를 독립적으로 관측하는 것이 중요함을 시사한다. 반면 수증기 플럭스

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 chang

We investigated the budget equations of H 2 O and CO 2 exchanges in a hilly KoFlux forest catchment. This site is characterized by a rolling terrain and mountain‐valley circulations. The field measurements included two‐level eddy‐covariance (at 20 and 40 m) and H 2 O/CO 2 concentration profile systems on a single tower. To properly assess the vertical wind speed, we applied a planar fit rotation with atmospheric stabilities and wind directions. As atmospheric stability changed, the planar fit ro

We investigated the turbulence structures in the surface layer over a flat and homogeneous prairie on the Tibetan plateau. In general, turbulence statistics show similar results to those reported in the literature from other normal sites. However, further scrutiny of turbulence data from different heights and (co)spectra analysis revealed that 1) height‐dependent turbulence statistics of vertical wind velocity; 2) a spectral gap with the absence of k −1 power law in mid frequencies in the spectr

Abstract. Turbulence statistics such as flux-variance relationship are critical information in measuring and modeling ecosystem exchanges of carbon, water, energy, and momentum at the biosphere-atmosphere interface. Using a recently proposed mathematical technique, the Hilbert-Huang transform (HHT), this study highlights its possibility to quantify impacts of non-turbulent flows on turbulence statistics in the stable surface layer. The HHT is suitable for the analysis of non-stationary and inter

Tibetan Plateau is vulnerable to climate changes. At the same time, an altered surface radiation balance on the Plateau due to its rapid development would contribute to feedback and causes of global climate changes, particularly the Asian summer monsoon. In this study, we investigated surface radiation balance on the Tibetan Plateau by comparative analysis of two land surface models with the in‐situ observation data. Our scrutiny reveals that radiative coupling, which has been neglected over low

Abstract During the Asian monsoon period, intense precipitation commonly occurs for an extended period in accompaniment with a reduction in solar radiation. This suggests that wet surface evapotranspiration is an important contributor to the total evapotranspiration. Therefore, investigating evapotranspiration over a wet canopy surface is critical to achieve a better understanding of water and energy cycles in Asia. In this study, we estimated surface resistances under wet conditions in a mixed

Abstract. To validate the Geostationary Environment Monitoring Spectrometer (GEMS), the GEMS Map of Air Pollution (GMAP) campaign was conducted during 2020–2021 by integrating Pandora Asia Network, aircraft, and in situ measurements. In the present study, GMAP-2020 measurements were applied to evaluate urban air quality and explore the synergy of Pandora column (PC) NO2 measurements and surface in situ (SI) NO2 measurements for Seosan, South Korea, where large point source (LPS) emissions are de

ABSTRACT Electricity demand is influenced by atmospheric conditions, and, therefore it is important to quantify their relationships suitably for accurate electricity demand forecasting and the implementation of power‐saving policies. However, interdependencies and characteristics of covariance among meteorological variables within the same periodicities hinder the quantification of their direct and indirect impacts on electric power load. To investigate the strength of the direct correlation bet

To assess the interactions of key ecosystems with the overlying atmosphere, it is fundamental to understand the turbulence structure within and above their canopies. Rice is a staple crop particularly in Asia, and, yet, information on canopy turbulence of this vital food resource is limited by the scarcity of field measurement. The purpose of this study was to examine whether rice canopy shows an organized turbulence structure and, if so, whether such coherent structure scales to the patterns fo