Young Yul Ryu
Seoul National University · 環境科学
研究室紹介
Professor Young Yul Ryu's research lab specializes in terrestrial biosphere-atmosphere interactions, focusing on the development and application of satellite-based models to quantify global carbon, water, and energy cycles. The lab pioneers integrated Earth system modeling using remote sensing data—particularly from MODIS and FLUXNET—to improve understanding of gross primary productivity, evapotranspiration, and methane emissions across diverse ecosystems. A central theme is the coupling of atmospheric and canopy radiative transfer processes through advanced simulation frameworks like the Breathing Earth System Simulator (BESS), enabling high-resolution, globally consistent estimates of ecosystem fluxes. The lab also emphasizes long-term data consistency, uncertainty quantification, and the role of canopy structure in interpreting remote sensing signals such as sun-induced fluorescence (SIF).
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15We propose the Breathing Earth System Simulator (BESS), an upscaling approach to quantify global gross primary productivity and evapotranspiration using MODIS with a spatial resolution of 1-5 km and a temporal resolution of 8 days. This effort is novel because it is the first system that harmonizes and utilizes MODIS Atmosphere and Land products on the same projection and spatial resolution over the global land. This enabled us to use the MODIS Atmosphere products to calculate atmospheric radiat
Abstract Understanding the long‐term performance of global satellite leaf area index ( LAI ) products is important for global change research. However, few effort has been devoted to evaluating the long‐term time‐series consistencies of LAI products. This study compared four long‐term LAI products ( GLASS , GLOBMAP , LAI 3g, and TCDR ) in terms of trends, interannual variabilities, and uncertainty variations from 1982 through 2011. This study also used four ancillary LAI products ( GEOV 1, MERIS
We report on the interannual variability of evapotranspiration ( E ) and energy exchange of an annual grassland in the Mediterranean climate zone of California. They were measured directly with the eddy covariance technique over a 6‐year period that spanned between July 2001 and June 2007 and experienced a large range in precipitation (376 mm to 888 mm). Despite a two‐fold range in precipitation, annual E ranged much less, between 266 mm and 391 mm. We found that pronounced energy‐limited and wa
Abstract. Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (EC) measurements of CH4 flux are ideal for constraining ecosystem-scale CH4 emissions due to quasi-continuous and high-temporal-resolution CH4 flux measurements, coincident carbon dioxide, water, and energy flux measurements, lack of ecosyst
Sun-induced chlorophyll fluorescence (SIF) is a promising new tool for remotely estimating photosynthesis. However, the degree to which incoming solar radiation and the structure of the canopy rather than leaf physiology contribute to SIF variations is still not well characterized. Therefore, we investigated relationships between SIF and variables that at least partly capture the canopy structure component of SIF. For this, we relied on high-quality SIF observations from ground-based instruments