隐式溶剂下S-亮氨酸体系分子轨道NAO贡献的计算

利用高斯内置的自然键轨道(NBO)分析程序,计算不同隐式溶剂下S-亮氨酸(S-Leu)体系分子轨道的自然原子轨道(NAO)贡献.结果表明:隐式溶剂甲醇和氯仿对S-Leu体系分子轨道根据所属中心加和的NAO贡献影响较大,隐式溶剂甲醇和H_2O的NAO贡献计算结果更接近;隐式溶剂甲醇下羧基片段的NAO贡献总值与隐式溶剂H_2O下的计算结果更接近;隐式溶剂氯仿、甲醇和H_2O对羧基片段的NAO贡献影响不同.     

基于NAO.99b资料对南海主要岛礁潮汐特征的分析

为了详细地认识南海岛礁潮汐特征,基于大洋潮汐模式NAO.99b的全球8个分潮(M_2、S_2、N_2、K_2、K_1、O_1、P_1、Q_1)调和常数资料建立南海潮汐计算模型。利用该模型计算南海主要岛礁2010年逐分钟的潮位,得出了这些岛礁的最大潮差、平均潮差、平均高潮间隙和潮汐特征系数。结果表明:南海岛礁绝大部分为不正规日潮型,潮汐特征系数在2.98~4.34;在半个月中,有连续六七天为每日2个高低潮。平均高潮间隙整体从南海东北部往西南部逐渐增大,范围为8.32~11.63h,曾母暗沙为1.57h;平均潮差和最大潮差从南海东北部向西南部逐渐增大,平均潮差变化范围为65~92cm,最大潮差变化范围144~200cm。     

Variation of the NAO and NPO associated with climate jump in the 1960s

The interannual variation of the North Atlantic Oscillation (NAO) and North Pacific Oscillation (NPO) and its relationship with the climate jump in the Northern Hemisphere in the 1960s, are discussed using the data analyses. It is clearly shown that the amplitudes of the NAO and NPO were all increased obviously in the 1960s and the main period of the oscillations changed from 3–4 years before the 1960s to 8–15 years after the 1960s. Therefore, the climate jump in the 1960s is closely related to the anomalies of the NAO and NPO.     

Arctic sea ice bordering on the North Atlantic and interannual climate variations

Variations of winter Arctic sea ice bordering on the North Atlantic are closely related to climate variations in the same region. When winter North Atlantic Oscillation (NAO) index is positive (negative) anomaly phase, Icelandic Low is obviously deepened and shifts northwards (southwards). Simultaneously, the Subtropical High over the North Atlantic is also intensified, and moves northwards (southwards). Those anomalies strengthen (weaken) westerly between Icelandic Low and the Subtropical High, and further result in positive (negative) sea surface temperature (SST) anomalies in the mid-latitude of the North Atlantic, and increase (decrease) the warm water transportation from the mid-latitude to the Barents Sea, which causes positive (negative) mixed-layer water temperature anomalies in the south part of the Barents Sea. Moreover, the distribution of anomaly air temperature clearly demonstrates warming (cooling) in northern Europe and the subarctic regions (including the Barents Sea) and cooling (warming) in Baffin Bay/Davis Strait. Both of distributions of SST and air temperature anomalies directly result in sea ice decrease (increase) in the Barents/Kara Seas, and sea ice increase (decrease) in Baffin Bay/Davis Strait. :