| 摘要: |
| 根据黄海1977年5月至1981年11月逐月温度、盐度、溶解氧含量和pH值大面调查资料以及黄海大气CO2浓度观测月平均值资料，采用旋转经验正交函数（REOF）、调和分析和延迟相关分析等方法，分析了黄海pH值场季节循环时空模态与机制．黄海pH值场季节循环主要有两种时空模态：上层（表层至20m）pH值场第一、二模态空间分量为南北型分布，海气CO2交换、生物活性组分光合与呼吸作用以及表层pH值模态位相向深层垂直传播是主要影响因素；下层（30m至底层） pH值场第一、二模态空间分量为东西型分布，沉积物需氧、生物碎屑分解耗氧等是主要影响因素．pH值模态空间分量垂直分布为两层结构，pH值模态时间分量中周期分量不是主要分量，并且季节周期循环稳定性较弱，容易受到年际变化分量的影响产生季节循环变异．pH值场季节循环模态在表、中、底层存在不同的季节变化扰动源，表层扰动源中，海气CO2交换作用和表观耗氧量物理生物效应的非线性作用分别是主要、次要影响因素；中层扰动源中，中层表观耗氧量物理生物效应过程以及相邻上下层pH值扰动传入是主要影响因素；底层扰动源中，底层表观耗氧量物理生物效应过程是主要影响因素，沉积物需氧、底层温度、盐度是次要影响因素．在平均季节分布中，海气CO2交换作用产生的黄海表层pH值场季节扰动占优势，季节变化位相自表层传播至底层需1个月．黄海表、中、底层pH值扰动源的分层效应，在年际变化中比季节循环变化中的表现更为显著． |
| 关键词: 海洋水文学 pH值场 季节循环 时空模态 海气CO2交换 黄海 |
| DOI： |
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| 基金项目:山东省海洋生态环境与防灾减灾重点实验室资助项目（2011011）；海洋溢油鉴别与损害评估技术国家海洋局重点实验室资助项目（2015010） |
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| Spatio-temporal modes on the seasonal cycle of pH field in the
Yellow Sea and its mechanism |
| SHI Qiang |
| (Shandong Province Key Laboratory of Marine Ecological Environment and Disaster Prerention and Mitigation，Qingdao 266033,China; North China Sea Enviromnental Monitoring Center,SOA.Qingdao 266033 ,China; Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology. SOA . Qingdao 266033 .China) |
| Abstract: |
| Used monthly datasets of temperature, salinity dissolved oxygen and pH from May 1997 to November
1981 and monthly mean atmospheric carbon dioxide concentration data in the Yellow Sea, the spatio-temporal
modes on the seasonal cycle of pH field in the Yellow Sea and its mechanism are studied with Rotated Empirical Or-
thogonal Function ( REOF), harmonic analysis and the delay correlation analysis methods. The results show that
the seasonal variation of pH field in Yellow Sea is divided into two kinds of the spatio-temporal modes. For the up-
per layer (surface io 20 m) . the spatial component of the first and second mode demonstrates a north-south distribution pattern, with main influencing factois of the air sea exchange CO2, photosynthesis respiration of biological
active component and the downward transmission of the phase of pH modes from the surface to the deep layer. For
the lower layer (30 m to bottom) , the spatial component of the first and second mode piesents an east-west distribution type. The main influencing factors are attributed to the sediment oxygen demand and the decomposition oxy
gen consumption of biological debris. The spatial component of the pH modes shows a vertically dual-layer structure. The periodic component of the pH modes is not the dominant factor and the stability of seasonal periodic cycle
is relatively weak, which is susceptible to impacts from the inteiannual variation component and hence to produce
tfie seasonal cycle mutation. The pH modes in tfie surface, middle and bottom vary with seasonal disturbance sources.Air-sea exchange effect of carbon dioxide and physical-biological effects of apparent oxygen utilization with
the nonlinear effect act as the firet and secondary influencing factors is in tfie surface, respectively. As to the middle
layer, the physical-biological effects of apparent oxygen utilization of tfie middle and the incoming pH modes dis
turbance from the adjacent upper and lower layers play important roles. And for the bottom layer, the physical-bio-
logical effects of apparent oxygen utilization is believed to be important influence factor, while sediment oxygen de-
mand, bottom temperature, salinity effects seem to play the secondary roles. On Ae seasonal mean timescale, sea-
sonal disturbance of pH field induced by the surface air-aea exchange of carbon dioxide is the dominant factor with
seasonal chaining phase propagating from surface to bottom less than one month. However, the stratification efiecls of
the pH disturbances are more prominent on inteiannual timescale than that on seasonal timescale in tfie Yellow Sea. |
| Key words: marine hydrology pH filed seasonal cycle spatio-temporal modes air-sea exchange of carbon diox
ide Yellow Sea |
