SST data assimilation experiments using an adaptive variational method

An adaptive variational data assimilation method is proposed by Zhu and Kamachi^[1]. This method can adaptively adjust the model state without knowing explicitly the model error covariance matrix. The method enables very flexible ways to form some reduced order problems. A proper reduced order problem not only reduces computational burden but also leads to corrections that are more consistent with the model dynamics that trends to produce better forecast. These features make the adaptive variational method a good candidate for SST data assimilation because the model error of an ocean model is usually difficult to estimate. We applied this method to an SST data assimilation problem using the LOTUS data sets and an ocean mixed layer model (Mellor-Yamada level 2.5). Results of assimilation experiments showed good skill of improvement subsurface temperatures by assimilating surface observation alone.     

声学界面自旋波与界面各向异性

考虑了外磁场，体和界面各向异性后，详细研究了铁磁或反铁磁层间耦合下自旋双链系统中的声学界面自旋波及其存在的充要条件，发现在适当的界面各向异性的条件下，该系统可以存在０，１或２个声学界面自旋波，其能量随铁磁层间耦合强度的增大而升高，却随反铁磁层间耦合强度的增大而降低。     

黄海西岸胶州湾至海州湾段全新世海岸变迁

根据海蚀、海积地貌特征，分析了黄海西岸海州湾到胶州湾这段岸全新世以来的海岸变迁过程，认为该区中全新世曾出现过高于现代海平面１．５米左右的高海面。     

有限深层化海洋中的压力脉动点源函数

利用积分变换和本征函数展开法，导出了层化海洋中有限深情形下二维和三维压力脉动源函数的一个更易于分析和数值计算的双线性级数表达式．对二层海情形，源点越接近密跃层，内辐射波越大；若低频或海水显著分层，即使源点离密跃层较远，内辐射波也有可能是显著的，且其振幅可大于自由表面辐射波振幅；低频时在仅对内波感兴趣的情形，在自由面上作刚性壁假定是合适的     

河北省东部海区文昌鱼的栖息环境及形态特征

描述了河北省东部海区文昌鱼的栖息环境及体长、体高、生殖腺数目、肌节数目、背鳍条数目及口笠触手数目等形态特征，并与模式种－－厦门文昌鱼（ＢｒａｎｃｈｉｏｓｔｏｍａｂｅｌｃｈｅｒｉＧｒａｙ）做了相应比较。结论认为，河北省东部海区文昌鱼与厦门文昌鱼同属一种，可能是该种不同的地理亚种。     

浅海非线性随机波浪的谱特性分析

应用非线性谱分析理论推导及数值计算方法，对浅海非线性随机波浪的谱特性进行了分析．首先将波面方程、海水质点的速度及加速度分解成一阶和二阶分量，通过引入Hermite多项式，得到了波面方程与其一阶分量的自相关函数之间的关系，从而确定了一阶波面分量的谱密度，进而得到了速度谱及加速度谱密度．     

大血管中血液流动的非线性波

研究了血流的孤子理论．随着大血管中的血液流动，孤子的振幅将要增大，此结论同实验结果一致．     

Preconcentration of vanadium(V) on crosslinked chitosan and determination by graphite furnace atomic absorption spectrometry

A new method is proposed for the preconcentration of vanadium(V) with crosslinked chitosan (CCTS) and determination by graphite furnace atomic absorption spectrometry (GFAAS). The adsorption rate of vanadium(V) by CCTS was 97% at pH 4.0, and vanadium(V) was eluted from crosslinked chitosan with 2 mL 2.0 mol·L⁻¹ chlorhydric acid and determined by GFAAS. The detection limit (3σ,n=7) for vanadium (V) was 4.8×10⁻¹²g and the relative standard deviation (R.S.D) at concentration level of 2.6 μg·L⁻¹ is less than 3.6%. The method shows a good selectivity and high sensity, and it was applied to determination of vanadium(V) in oyster and water samples. The analytic recoveries are (97±5)%. Biography: Wu Wei (1975-), female, Master candidate, research direction: environmental & analytical chemistry.     

Determination of global mean sea surface WHU2000 using multi-satellite altimetric data

In this study, the overall editing criteria for altimetric data are considered and the geophysical correction models is improved. The datum for various altimetric data is also unified and the method of a full-combined crossover adjustment for different altimetric tracks is used to improve the radial orbits of Geosat, ERS-1 and ERS-2 data. In addition, the method for determining mean sea surface (MSS) by using multi-altimetric data is developed. The data used to compute WHU2000 MSS include 7-year Topex/Poseidon data (cycles 11-249), 2-year Geosat ERM data (cycles 1-44), 5- year ERS2 data (cycles 1-52) and all ERS-1 168-day data. The WHU2000 MSS is determined with a grid resolution of 2′× 2′ within the ± 82° latitude and its precision is better than 0.05 m. Comparing WHU 2000MSS with 3.75′ 3.75 CLS_SHOM98.2 MSS, 3′×3′ GFZ MSS95A and 3.75′×3.75′ OSU MSS95, as external checks, the corresponding standard deviation (STD) of their differences is 0.090 m, 0.211 m and 0.079 m respectively.