日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

[A-HW22] 流域の物質輸送と栄養塩循環-源流域から沿岸海域まで-

2019年5月30日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:小林 政広(国立研究開発法人森林研究・整備機構 森林総合研究所)、吉川 省子(農業・食品産業技術総合研究機構 農業環境変動研究センター)、安元 純(琉球大学 農学部 地域農業工学科)、Adina Paytan(University of California Santa Cruz)

[AHW22-P02] Modeling chlorophyll-a concentration using remote sensing in shallow water systems: Comparison of sensors

*Assefa M Melesse1Tara Blakey1Mohammad Haji Gholizadeh1 Mohd Manzar Abbas1 (1.Florida International University)

キーワード:Chl-a, SeaWIFS, Water qulity modeling, South Florida, Remote sensing

The level of productivity in the upland and coastal water bodies is highly linked to land processes (land use, water management, water and nutrient fluxes). Understanding the linkage between these processes and the level of algal blooms in the water bodies is crucial for improving water quality. A comparative study was conducted using remote sensing data from three different sensors (SeaWIFS, MoDIS and Landsat) to evaluate the capability of reflectance data from these sensors for estimation of chl-a concentrations in three water bodies in the USA (Lake Okeechobee, Florida Bay and Chesapeake Bay). Observed chl-a data were gathered and compared with simulation results. The analysis found that all of the sensors have performed well in deeper water bodies than in shallow sections due to the bottom reflectance from non-algal blooms. For shallow water bodies, selection of the proper bands and band combinations, identification of the non-algal bloom reflectance and the corresponding algorithms can improve the simulation. Seasonality as well as spatial variability (using cross-sections) were evaluated and the results showed that chl-a values were highly variable for the selected summer months. Indicative of the effect of land surface fluxes of nutrients, chl-a values were higher closer to coastal areas in the Florida bay and Chesapeake Bay. The chl-a in the freshwater lake of Okeechobee was simulated using Landsat 8 data and the results found were very good. Comparison of the SeaWIFS and MoDIS chl-a value to that of the measured concentrations in the deeper section of Florida Bay and Chesapeake Bay, respectively showed very good agreement.