CAJ | 학술논문

2008年8月至9月对南海北部71个站位进行了叶绿素a的空间分布调查。调查结果显示叶绿素a在不同水层的水平分布差异很大。表层和25m层的叶绿素a浓度分布极度不均匀,基本沿西北向东南方向逐渐减小。粤东近海表层叶绿素a浓度高值超过2μg·L?1,而南海北部表层和25m处的叶绿素a平均分别仅为0.15和0.11μg·L?1。在东沙西南和琼东近岸的25m和50m处均出现了叶绿素高值。100-200m层的叶绿素 a的水平分布规律与上层不同,受黑潮影响的吕宋海峡附近的站位的叶绿素值明显高于其他海区。叶绿素 a 的垂直分布模式随站位深度存在较大的差异：在水深为50-200m的站位中,多数测站的叶绿素最大值出现在50m处,而且峰值比较突出；而在水深>200m的站位中,叶绿素最大值一般出现在50m至75m之间,峰值比较平缓。珠江冲淡水向东北偏转和粤东上升流涌升水应该是造成粤东近岸叶绿素 a值异常升高的主要原因。从温盐垂直分布来看,次表层叶绿素最大值深度与水体的混合层深度密切相关。在南海北部寡营养盐水体中,上层水体叶绿素a和营养盐的关系比较复杂,营养盐与叶绿素a浓度在不同水层表现出不同的相关性。生物吸收作用和海水的物理运动对叶绿素与营养盐的关系可能都会产生较大的影响。
2008년8월지9월대남해북부71개참위진행료협록소a적공간분포조사。조사결과현시협록소a재불동수층적수평분포차이흔대。표층화25m층적협록소a농도분포겁도불균균,기본연서북향동남방향축점감소。월동근해표층협록소a농도고치초과2μg·L?1,이남해북부표층화25m처적협록소a평균분별부위0.15화0.11μg·L?1。재동사서남화경동근안적25m화50m처균출현료협록소고치。100-200m층적협록소 a적수평분포규률여상층불동,수흑조영향적려송해협부근적참위적협록소치명현고우기타해구。협록소 a 적수직분포모식수참위심도존재교대적차이：재수심위50-200m적참위중,다수측참적협록소최대치출현재50m처,이차봉치비교돌출；이재수심>200m적참위중,협록소최대치일반출현재50m지75m지간,봉치비교평완。주강충담수향동북편전화월동상승류용승수응해시조성월동근안협록소 a치이상승고적주요원인。종온염수직분포래간,차표층협록소최대치심도여수체적혼합층심도밀절상관。재남해북부과영양염수체중,상층수체협록소a화영양염적관계비교복잡,영양염여협록소a농도재불동수층표현출불동적상관성。생물흡수작용화해수적물리운동대협록소여영양염적관계가능도회산생교대적영향。
The spatial distribution of chlorophyll a was investigated in northern South China Sea in late summer 2008. The horizontal distribution of chlorophyll a was basically heterogeneous at the surface and 25-m depth, decreasing from northwest to southeast. Maximum value of chlorophyll a was more than 2μg·L?1 at the coastal station of eastern Guangdong province. The average concentrations of chlorophyll a were only 0.15 and 0.11μg·L?1 at the surface and 25 m of northern South China Sea, respectively. Chlorophyll a showed a high value in 25 and 50 m in the southwest of Dongsha Island and east of Hainan Island. In the layer of 100?200 m, the concentration of chlorophyll a was obviously higher nearby the Luzon Strait, where influence by the Kuroshio was present. The vertical distribution patterns of chlorophyll a were different between sampling stations with different bottom depths. At the shallow water stations (50?200 m), the depth of maximum chlorophyll a generally appeared at 50 m with an outstanding peak; at the deep-water stations (> 200 m), the depth of maximum chlorophyll a was between 50 and 75 m with a gentle peak. According to the data of temperature and salinity, the high chlorophyll a in the coastal region of eastern Guangdong province should be caused by the northeastward Zhujiang River discharge and coastal upwelling. The mixed layer depth should be an important factor influencing the depth of deep maximum chlorophyll a. In the oligotrophic northern South China Sea, the relationship between chlorophyll a and nutrients was complicated in the upper layer. In the layer of 0?75 m, chlorophyll a positively related with NO2, NH4 and DIP(dissolved inorganic phosphorus, DIP), while negatively related with NO3 and SiO3. In the layer of 100?200 m, chlorophyll a negatively related with nutrients. Bio-uptake of phytoplankton and physical movement of ocean flow all can have a great influence on the relationship between chlorophyll a and nutrients.