渤海中部海底恒温层温度及泥温相位随深度变化特征

利用渤海中部两点一年中４个季节泥温观测资料，近似确定两测点海底恒温层泥温分别为１１．０℃和１１．７℃。认国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ｌ８＝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。

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

In situ data measured in the representative months (Jan., Apr. - May, Aug., Oct. - Nov.) and the thermal conduction equation were used to calculate the soil depth with constant temperature (DCT) for two sites in the central part of the Bohai Sea. 'The calculated DCT was about 8 m at site 8# and 10 m at site A(B) with the DCT criterion being that the annual variation of soil temperature is equal to or less than 0.1°C. In the light of the results and with those on terrestrial soil temperature as reference, it is proposed that the multi-year averaged soil temperature at 0.5 m below the sea-bed could be taken as the temperature at the DCT, being 11.0°C and 11.7°C at the two sites, respectively.

The calculated results also show that the soil temperature variation with depth can be considered to be a vertical wave-soil temperature wave, with its wave length equaling the length of the soil layer with varying temperature, i.e, the length from the sea-bed surface to the DCT, 8 m at site 8# and 10 m at site A(B). At the depth of half wave-length, the phase of the soil temperature is opposite to that at the sea-bed surface. In summer, the soil temperature is maximum at the sea-bed surface and minimum at the depth of half wave-length; the situation is contrary in winter.