海洋湖沼通报
海洋湖沼通報
해양호소통보
TRANSACTIONS OF OCEANOLOGY AND LIMNOLOGY
2014年
2期
161-168
,共8页
渤海%溶解氧%表观耗氧量%时空模态
渤海%溶解氧%錶觀耗氧量%時空模態
발해%용해양%표관모양량%시공모태
Bohai sea%dissolved oxygen%apparent oxygen utilization%temporal-spatial model
根据渤海断面1978-2013年历年2月表底层海水温度、盐度、溶解氧观测资料，采用旋转经验正交函数(REOF)、最大熵谱和延迟相关分析等方法，分析得出：渤海冬季表底层溶解氧年际变化主要有2种时空模态：开阔海型和黄河口型，第1种模态时间分量为显著周期和线性下降趋势变化，表底层水体存在溶解氧显著线性降低趋势；第2种模态时间分量为显著周期准平衡变化。渤海冬季表底层表观耗氧量年际变化主要有2种时空模态：渤中-黄河口型和辽河口型，第1种模态时间分量为显著周期和线性上升趋势变化，表底层水体存在显著线性贫氧趋势；第2种模态时间分量为显著周期准平衡变化。冬季渤海中部和黄河口附近海域是出现溶解氧降低与贫氧状况显著线性趋势的主要海域，海洋生化效应和冬季水温模态年际变化是影响渤海冬季溶解氧、表观耗氧量模态年际变化的主要因素之一。渤海冬季表层溶解氧、表观耗氧量时空模态出现10a尺度跃变。
根據渤海斷麵1978-2013年歷年2月錶底層海水溫度、鹽度、溶解氧觀測資料，採用鏇轉經驗正交函數(REOF)、最大熵譜和延遲相關分析等方法，分析得齣：渤海鼕季錶底層溶解氧年際變化主要有2種時空模態：開闊海型和黃河口型，第1種模態時間分量為顯著週期和線性下降趨勢變化，錶底層水體存在溶解氧顯著線性降低趨勢；第2種模態時間分量為顯著週期準平衡變化。渤海鼕季錶底層錶觀耗氧量年際變化主要有2種時空模態：渤中-黃河口型和遼河口型，第1種模態時間分量為顯著週期和線性上升趨勢變化，錶底層水體存在顯著線性貧氧趨勢；第2種模態時間分量為顯著週期準平衡變化。鼕季渤海中部和黃河口附近海域是齣現溶解氧降低與貧氧狀況顯著線性趨勢的主要海域，海洋生化效應和鼕季水溫模態年際變化是影響渤海鼕季溶解氧、錶觀耗氧量模態年際變化的主要因素之一。渤海鼕季錶層溶解氧、錶觀耗氧量時空模態齣現10a呎度躍變。
근거발해단면1978-2013년력년2월표저층해수온도、염도、용해양관측자료，채용선전경험정교함수(REOF)、최대적보화연지상관분석등방법，분석득출：발해동계표저층용해양년제변화주요유2충시공모태：개활해형화황하구형，제1충모태시간분량위현저주기화선성하강추세변화，표저층수체존재용해양현저선성강저추세；제2충모태시간분량위현저주기준평형변화。발해동계표저층표관모양량년제변화주요유2충시공모태：발중-황하구형화료하구형，제1충모태시간분량위현저주기화선성상승추세변화，표저층수체존재현저선성빈양추세；제2충모태시간분량위현저주기준평형변화。동계발해중부화황하구부근해역시출현용해양강저여빈양상황현저선성추세적주요해역，해양생화효응화동계수온모태년제변화시영향발해동계용해양、표관모양량모태년제변화적주요인소지일。발해동계표층용해양、표관모양량시공모태출현10a척도약변。
By the dataset of February-survey in surface and bottom layers in the Bohai Sea from 1978 to 2013,the changes in the temperatures,salinities and dissolved oxygen were studied with the analysis methods of Rotated Empirical Orthogonal Function (REOF),maximum entropy spectral and the delay correlation analyses.The results showed that the dissolved oxygen in the surface and bottom layers had the two main kinds of the inter-annual change models in temporal and spatial scales:open sea and Yellow Sea estuary,in the first one of which the temporal variable component represented the notable cycle and linear falling trend,and in the second one the quasi-equilibrium change of the notable cycle. The apparent oxygen utilization in the surface and bottom layers had the two main kinds of the inter-an-nual change models in temporal and spatial scale:Bohai Sea Middle-Yellow River estuary and Liaohe River estuary,in the first one of which the temporal variable components represented the notable cycle and linear rising trend,and in the second one the quasi-equilibrium change of the notable cycle.The marine areas in the Bohai Sea Middle and near Yellow River estuary were the main ones in which dis-solved oxygen decreased and poor oxygen appeared in linear falling trend.The marine biochemical effect and the inter-annual winter water temperature model change were ones of the main factors of affecting the annual change of dissolved oxygen and apparent oxygen utilization,whose temporal and spatial models showed the ten-year scale j ump.
