摘要
依据“科学一号”调查船1994年4月在东海10个断面上所进行的表层水连续走航观测资料（总航程3600km，47万个观测数据），研究东海表层水叶绿素α含量在不同空间尺度（0．01－100km）上的分布特征和变化规律、结果表明，叶绿素α含量在陆架区高，在外海抵；测区南部海域的含量一般高于北部海域。叶绿素α含量的分布形态变化很大，在某些外海深水区，叶绿素α含量连续百余公里没有显著变化，变化幅度小于0．2mg／m3；而在某些近海浅水区，叶绿素α含量在不到1公里范围内的变化幅度达1．5mg／m3。叶绿素α含量大体存在着三种不同尺度的变化：普遍存在的0.01－0．1km量级的小尺度小幅度变化；1－10km量级的与斑块分市相关的脉冲式变化；更大尺度的与水团生产力水平相关的变化。功率谱随波数增加呈下降趋势，说明大幅度变化对应大空间尺度。
Using surface layer chlorophyll-α concentration data obtained bycontinuous flow measurement along ten transacts in the East China Sea (118-129° E,24-32°N) in April, 1994, the authors analysed the distribution characteristics andthe variation regularity of surface layer chlorophyll-α concentration on differentspatial sca1es (0.01- 100km) in the East China Sea The findings were as follows:chloroPhyll -α coneentration is comparatively high in the continental shelf and low inthe open seas; the observed coneentration in the south area is generally higher thanthat in the north The variation of the distribution pattern of chlorophyll-αconeentration is great, in some deep waters of the open seas, the variation of theconcentraton was not obvious within several hundreds of kilometers, the rang of thevariation was lower than 0.2 mg /m3, while in some shallow offshore waters, therange of the variation within one kilometer was high and up to 1.5 mg /m3 Therewere generally three kinds of variations of chiorophyll-α concentration variation of0.01 - 0.1km in spatial scale, 0.1 - 0.2 mg /m3 range influenced by short temporalscale and small spatial scale physical processes such as turbulenee and wave;pulse-shaped variation with 1 - 10km spatial scale, 1.0 - 2.0 mg /m3 range,correlated to both biological oceanographic processes and physical oceanographicprocesses such as population growth of phytoplankon and sea fron; variation of100km spatial scale, 1.0 - 2.0 mg /m3 range, renecting the productivity level of largespatial scale physical processes such as water masses and current systems Theamplitude of power spectra tends to decrease when wave-number increases, showingthat the bigger variation corresponds to larger spatial stretch
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1996年第5期487-492,共6页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!49276265
关键词
叶绿素α
分布特征
东海
表层水
Chlorophyll-α Distribution characteristics East China Sea
