Simulation of the ocean surface mixed layer under the wave breaking

A one-dimensional mixed-layer model, including a Mellor-Yamada level 2.5 turbulence closure scheme, was implemented to investigate the dynamical and thermal structures of the ocean surface mixed layer in the northern South China Sea. The turbulent kinetic energy released through wave breaking was incorporated into the model as a source of energy at the ocean surface, and the influence of the breaking waves on the mixed layer was studied. The numerical simulations show that the simulated SST is overestimated in summer without the breaking waves. However, the cooler SST is simulated when the effect of the breaking waves is considered, the corresponding discrepancy with the observed data decreases up to 20% and the MLD calculated averagely deepens 3.8 m. Owing to the wave-enhanced turbulence mixing in the summertime, the stratification at the bottom of the mixed layer was modified and the temperature gradient spread throughout the whole thermocline compared with the concentrated distribution without wave breaking.     

辽宁短期气候变化的波动理论研究

通过近50 a的资料分析得知,气候形成三大因子太阳辐射、大气环流和地理环境年际间的异常波动是引起短期气候变化的根本原因,也是气候灾害年诊断预测的物理依据。运用波动理论不仅能诊断当年的气候灾害,还能开展3～5 a的气候趋势滚动预测。     

古利库金(银)矿床地质特征和成因

古利库金(银)矿床为冰长石-绢云母型,产出与燕山中期"减压-剪切"环境下中心式火山喷发活动有关;矿床(体)受火山穹隆和爆破角砾岩筒及北西向、北东向断裂构造控制;容矿岩石为早白垩世龙江组、光华组安山岩、英安岩和新元古界-下寒武统落马湖群糜棱岩化的长英质片岩、片麻岩;矿床划分出矿化早期、主期和晚期3个矿化期,6个成矿阶段,3类组分矿体(Au型、Au-Ag型和Ag型)和脉状、网脉状两种形态矿体;围岩蚀变主要有硅化、冰长石化、绢云母化、白云石化、黄铁矿化等,硅化和冰长石化与矿化关系最密切;成矿温度185~255℃;成矿压力13.5 MPa (平均);成矿溶液盐度0.564% NaCl (平均);成矿深度500~600m.文中对成矿作用、矿床成因和成矿模式亦进行了探索和阐述.     

赣东北地区不同时代硅质岩的地球化学特征及其地质意义

赣东北地区硅质岩各时代均有不同程度的发育,各时代硅质岩的SiO2含量变化范围为74．90％～97．19％,Si／Al为10．84～93．21,与Al2O3呈较好的负相关关系,表明它们含有较高比例的陆源泥质沉积物,硅质岩样品的Al2O3／(Al2O3+F2O3)=0．60～0．99,Ce／Ce=0．99～1．22,(La／Ce)N=0．91～1．83,V／Y<5．78,Ti／V>17。上述特征表明本区硅质岩形成于大陆边缘构造环境,而与大洋盆地及洋中脊构造环境无关。自古生代以来,该地区没有出现深海大洋盆地环境。     

古利库金(银)矿床的稳定同位素地球化学特征

通过对大兴安岭古利库金银矿床的成矿热液流体的温度测定和同位素组成的研究,确定该矿床属浅成低温热液类型,并将成矿作用划分为2个成矿阶段,早期阶段成矿温度240~280℃,晚期成矿温度185~235℃.成矿热液流体的氢氧同位素组:δD_H2O-76‰~-94‰,δ¹⁸O-6.58‰~-14.11‰,表明成矿热液来自大气降水.矿石的硫和铅同位素组成说明成矿热液硫来自中生代火山岩,而铅是从基底落马湖变质岩系及相伴的兴凯期花岗岩类中萃取出来的.     

废弃矿井煤层气资源量计算范围研究

三带理论及煤层气的解吸/吸附理论,结合残余瓦斯压力理论及国内外的相关经验数据,从理论上对废弃矿井煤层气资源量的计算范围的确定进行了探讨。提出了确定废弃矿井煤层气资源量的计算范围的几种方法。      

近四十年季度天气趋势预报研究与实践的进展

本文总结了作者近４０年在季度天气趋势预报研究与实践的历程和主要进展。六十年代提出并利用中高纬和低纬前期大气环流特征与夏季江淮流域旱涝趋势的隔季遥联制作预报,８０年代补进一步考虑外在因子影响改进为“前期物理成因综合相似法”：１９６８～８７这２０年长江中下游夏季旱涝趋势预报取得较好成绩。随后的预报实践表明,因全球气候异常增长,预报难度有所增大。１９９５年开始建立一种短期气候系统多变因子的物理一统计预报     

塞拉利昂近海渔获生物多样性特征的调查研究

根据塞拉利昂近海１６条生产船１年的生产日志资料（１９９５－０７～１９９６－０６）,记述了该海区出现的渔获名录,渔业资源的分布与数量特征。指出塞拉利昂海区以捕虾为主,鱼虾兼捕,渔获物具有相对较高的多样性。同时,提出了加强渔业生物多样性保护和渔业资源合理利用的建议。     

Possible Linkage Between Tropical Indian Ocean SST Anomalies and the Date ofFirst and Last Tropical Cyclones Landfalling in the Chinese Mainland

Bases on the NCEP/NCAR reanalysis products, Had ISST dataset, and data of tropical cyclone(TC)landfalling in the Chinese mainland during 1960-2019, the possible impacts of Indian Ocean Dipole(IOD) mode and Indian Ocean basin(IOB) mode on the last-TC-landfall date(LLD) and first-TC-landfall date(FLD), respectively, are investigated in this study. The LLD is in significantly negative correlation with autumn IOD on the interannual timescale and their association is independent of El Nino-Southern O...     

神经网络油气检测技术

多参数神经网络油气检测技术首先提取四大类２６ 个地震波特征参数,并定量描述这些参数,然后用神经网络技术对这些参数进行分析,预测油气分布,使油气识别工作定量化、计算机化。本次研究开发了一套神经网络油气识别软件,并利用其对东濮凹陷胡１９ 块进行油藏精细描述,预测沙三下砂组含油面积０－７ ｋｍ２ ,石油地质储量７０ ×１０４ 吨。