渤海中部海底恒温层温度及泥温相位随深度变化特征

SOIL-TEMPERATURE AT THE DEPTH WITH CONSTANT TEMPERATURE AND PHASE CHARACTERISTICS OF SOIL TEMPERATURE PROFILE IN CENTRAL BOHAI SEA

利用渤海中部两点一年中4个季节泥温观测资料，近似确定两侧点海底恒温层泥温分别为11．0℃和11．7℃．认为泥温随深度变化可视为一垂向波-泥温波，并利用这一概念分析了泥温相位随深度变化特征，8#，A（B）平台测点泥温波波长分别为ｌs=8m和ｌA（B）=10m。研究建议，以0．5m处多年泥温平均值作为海底恒温层温度．

In situ data measured in the representative montbs (Jan., Apr.-May, Aug.,Oct-Nov.) and the thermal conduction equation were used to calculate the soildepth with constant temperature (DCT) for two sites in the central part of the Bo-hai Sea.The calculated DCT was about 8m at site 8# and 10m at site A(B) withthe DCT criterion being that the annual variation of soil temperature is equal to orless than 0.1℃. In the light of the results and with those on terrestrial soil temp-erature as reference, it is proposed that the multi-year averaged soil temperature at0.5m below the sea-bed could be taken as the temperature at the DCT, being 11.0℃and 11.7℃ at the two sites, respectively. The calculated results also show tbat the soil-temperature variation with depthcan be considered to be a vertical wave-soil temperature wave, with its wave lengthequaling the lengtli of the soil layer with varying temperature, i.e, the length fromthe sea-bed surface to the DCT, 8m at site 8# and 1om at site A(B). At the dep-th of half wave-length, tbe phase of the soil temperature is opposite to that at thesea-bed surface. In summer, the soil temperature is maximum at the sea-bed surfaceand minimum at the depth of half wave-length; the situation is contrary in winter.