Abstract:In situ winter Chlorophyll a data in Changjiang Estuary and the adjacent sea were compared with the active fluorescence data and remote sensing data, in order to analyze the distribution of chlorophyll a in winter and the potential applications of active fluorometer and remote sensing technology. The result shows that the mean chlorophyll a concentration of the investigate area in winter is approximately 0.85 mg/m3 with a high value zone (1.30 mg/m3) located at southeast of Changjiang Estuary. What's more, the value of the maximal fluorescence Fm and minimal fluorescence Fo measured by PhytoFlash submersible active fluorometer can give a very accurate depiction of the real surface distribution of chlorophyll a. Distribution of the maximal quantum yield (Fv/Fm) can be used to evaluate the responses of phytoplankton to different limiting factors such as nutrient, temperature and light, etc. In addition, though the average of chlorophyll a retrieved by remote sensing data (0.94 mg/m3) is a little higher than the measured value, it still has the practical value to reflect the real trend of chlorophyll a distribution.
LIU Guang-peng,GAO Lei,ZHU Li-xin et al. Research on active fluorometer and remote sensing technology of Changjiang Estuary in winter[J]. Marine Environmental Science, 2015, 34(2): 245-250.
NING X, LIU Z, CAI Y, et al.Physicobiological oceanographic remote sensing of the East China Sea:Satellite and in situ observations[J].Journal of Geophysical Research:Oceans, 1998, 103(C10):21623-21635.
GONG G, LEE CHEN Y, LIU K.Chemical hydrography and chlorophyll a distribution in the East China Sea in summer:Implications in nutrient dynamics [J].Continental Shelf Research, 1996, 16(12):1561-1590.
JEFFREY S W, HUMPHREY G F.New spectrophotometric equations for determining chlorophylls a, b, c1 and c2 in higher plants, algae and natural phytoplankton [J].Biochem Physiol Pflanzen, 1975, 167:191-194.
[17]
O'REILLY J E.SeaWiFS postlaunch calibration and validation analyses [R].California:NASA Goddard Space Flight Center, 2000.
[18]
WANG M.Remote sensing of the ocean contributions from ultraviolet to near-infrared using the shortwave infrared bands:simulations [J].Appl Opt, 2007, 46(9):1535-1547.
KOLBER Z, FALKOWSKI P G.Use of active fluorescence to estimate phytoplankton photosynthesis in situ [J].Limnology and Oceanography, 1993, 38(8):1646-1665.
[22]
CLEVELAND J S, PERRY M J.Quantum yield, relative specific absorption and fluorescence in nitrogen-limited Chaetoceros gracilis [J].Marine Biology, 1987, 94(4):489-497.
FALKOWSKI P G, KOLBER Z.Variations in chlorophyll fluorescence yields in phytoplankton in the world oceans [J].Functional Plant Biology, 1995, 22(2):341-355.
DEMMIG-ADAMS B, ADAMS III W W0.Photoprotection and other responses of plants to high light stress [J].Annual Review of Plant Biology, 1992, 43(1):599-626.
[33]
胡敦欣.长江、珠江口及邻近海域海陆相互作用 [M].北京:海洋出版社, 2003:66-78.
[34]
WANG B, WANG X, ZHAN R.Nutrient conditions in the Yellow Sea and the East China Sea [J].Estuarine, Coastal and Shelf Science, 2003, 58(1):127-136.