SW_ADTG Adiabatic temperature gradient绝热温度梯度
SW_ALPHA Thermal expansion coefficient (alpha)热膨胀系数（α）
SW_AONB Calculate alpha/beta (a on b)计算alpha / beta（a on b）
SW_BETA Saline contraction coefficient (beta)盐水收缩系数（β）
SW_BFRQ Brunt-Vaisala FrequencySquared (N^2)
SW_COPY Copyright and Licence file
SW_CP Heat Capacity (Cp) of Sea Water海水热容量（Cp）
SW_DENS Density of sea water海水密度
SW_DENS0 Denisty of sea water at atmospheric pressure大气压下的海水密度
SW_DIST Distance between two lat, lon coordinates两个纬度，经度坐标之间的距离
SW_DPTH Depth from pressure压力深度
SW_F Coriolis factor "f" 只需要给一个纬度值即可e.g. sw_f(30) lat=30
SW_FP Freezing Point of sea water海水凝固点
SW_G Gravitational acceleration重力加速度
SW_GPAN Geopotential anomaly地势异常
SW_GVEL Geostrophic velocity地转速度
SW_INFO Information on the SEAWATER library.
SW_PDEN Potential Density位势密度
SW_PRES Pressure from depth深度压力
SW_PTMP Potential temperature位势温度
SW_SALS Salinity of sea water海水盐度
SW_SALT Salinity from cndr, T, P cndr，T，P的盐度
SW_SATAr Solubility (saturation) of Ar in seawater Ar在海水中的溶解度（饱和度）
SW_SATN2 Solubility (saturation) of N2 in seawater N2在海水中的溶解度（饱和度）
SW_SATO2 Solubility (saturation) of O2 in seawater氧气在海水中的溶解度（饱和度）
SW_SVAN Specific volume anomaly比容异常
SW_SVEL Sound velocity of sea water海水声速
SW_SWVEL Surface wave velocity表面波速度
SW_SMOW Denisty of standard mean ocean water (pure water)标准平均海水（纯水）的密度
SW_TEMP Temperature from potential temperature来自位势温度的温度
SW_TEST Run test suite on library
SW_VER Version number of SEAWATER library
