Using a compact airborne spectrographic imager to monitor phytoplankton biomass in a series of lakes in north Wales

被引:15
作者
George, DG [1 ]
Malthus, TJ
机构
[1] Inst Freshwater Ecol, Ambleside LA22 OLP, Cumbria, England
[2] Univ Edinburgh, Dept Geog, Edinburgh EH8 9XP, Midlothian, Scotland
关键词
imaging spectrometer; phytoplankton biomass; lakes in Snowdonia and Anglesey;
D O I
10.1016/S0048-9697(00)00694-X
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Three lakes in Snowdonia and two on the island of Anglesey were surveyed using a Compact Airborne Spectrographic Imager (casi). Water samples for chlorophyll measurements and phytoplankton counts were collected at the time of the overflight and the optical characteristics of the lakes recorded by a scanning spectroradiometer. Spectral measurements in the five lakes showed that their optical characteristics were primarily determined by the concentration of phytoplankton in suspension. All the lakes were relatively clear, but the more productive waters contained small amounts of dissolved organic carbon of autochthonous origin. The airborne imaging spectrometer was programmed to measure upwelling radiance in eight narrow bands and linear regressions used to compare the performance of a selected range of chlorophyll retrieval algorithms. The results showed that the most effective algorithms were those based on measurements in the blue and green portions of the spectrum. The best single band algorithm was centred on 440 nm and explained 75% of the measured variation in the concentration of chlorophyll. The best multi-band algorithm was based on measurements taken at 560 and 440 nm and accounted for 94% of the recorded variation. Chlorophyll maps produced by this algorithm showed that the phytoplankton in most of the lakes was homogeneously distributed but surface patches of cyanobacteria were detected at one location. (C) 2001 Elsevier Science B,V. All rights reserved.
引用
收藏
页码:215 / 226
页数:12
相关论文
共 23 条
[1]  
Anger C., 1996, P 2 INT AIRB REM SEN, V1, P124
[2]  
ANGER CD, 1990, P SOC PHOTO-OPT INS, V1298, P72, DOI 10.1117/12.21337
[3]  
[Anonymous], P C PRIM PROD MEAS M
[4]   SPECTRA OF BACKSCATTERED LIGHT FROM SEA OBTAINED FROM AIRCRAFT AS A MEASURE OF CHLOROPHYLL CONCENTRATION [J].
CLARKE, GL ;
EWING, GC ;
LORENZEN, CJ .
SCIENCE, 1970, 167 (3921) :1119-&
[5]  
Dekker A.G., 1993, THESIS VRIJE U AMSTE, P222
[6]  
DEKKER AG, 1992, REMOTE SENS ENVIRON, V41, P211
[7]   PHYSICAL AND CHEMICAL-SCALES OF PATTERN IN FRESH-WATER LAKES AND RESERVOIRS [J].
GEORGE, DG .
SCIENCE OF THE TOTAL ENVIRONMENT, 1993, 135 (1-3) :1-15
[8]   Bathymetric mapping using a Compact Airborne Spectrographic Imager (CASI) [J].
George, DG .
INTERNATIONAL JOURNAL OF REMOTE SENSING, 1997, 18 (10) :2067-2071
[9]   The airborne remote sensing of phytoplankton chlorophyll in the lakes and tarns of the English Lake District [J].
George, DG .
INTERNATIONAL JOURNAL OF REMOTE SENSING, 1997, 18 (09) :1961-1975
[10]  
GEORGE DG, 1996, P 22 ANN C REM SENS, P325