FY-4A数据在2021年1月6—8日寒潮监测中应用

基于静止气象卫星图像解译理论和位涡理论,应用FY-4A水汽图像、干涉式大气垂直探测仪（GIIRS）产品和欧洲中心第五代大气再分析资料（ERA5）对2021年1月6—8日我国中东部地区寒潮天气进行分析。结果表明：高空冷涡和地面冷高压是影响此次寒潮天气的主要影响系统,冷空气5日08:00从贝加尔湖南部向东、向南加强发展,8日20:00 减弱;对比FY-4A/GIIRS与ERA5 850 hPa 24 h变温数据发现：两种数据反映的对流层低层冷空气东移南下特征和正负变温区域分布特征基本一致,FY-4A/GIIRS 850 hPa 24 h负变温中心和0℃等变温线的位置与ERA5数据接近,FY-4A/GIIRS 850 hPa 24 h变温中心值强度略大于ERA5。水汽图像暗区变暗附近的高层位涡的增加激发高层气旋性环流后侧下沉运动增强,干空气下沉造成了地面高压增强;500 hPa冷涡中心附近绝对涡度增加是引起冷空气增强的原因之一;冷空气急剧增强时段,中低层位涡的加大引起地面冷空气堆积,寒潮增强。FY-4A/GIIRS温度产品反映的冷空气移动特征与位涡理论对冷空气增强原因分析结果一致,说明应用FY-4A/GIIRS温度产品能够有效监测分析寒潮冷空气演变特征。     

米仓山隆起带西缘灯影组铅锌找矿潜力评价

较系统全面地叙述了米仓山隆起带灯影组铅锌矿成矿地质条件,为在其西缘寻找与陕西马元铅锌矿相同矿床类型矿产的找矿潜力进行了评价。     

豫西崤山后河岩体LA-ICP-MS锆石U-Pb定年及其地质意义

与豫西小秦岭和熊耳山地区相类似,崤山北部也出露一系列中酸性小岩体,但与之相关的成矿作用明显较弱,因此长期未获得应有的关注。崤山北部小岩体的形成时代与区域成岩成矿时代之间的匹配关系对其深部构造演化研究及成矿潜力评价具有重要意义,鉴于此,作者对后河岩体进行了LA-ICP-MS锆石U-Pb定年。后河岩体定年样品HH01的岩性为中-细粒黑云母二长花岗岩,30个锆石测点中有27个测点的测定值位于207Pb/235U-206Pb/238U一致线上,相应的206Pb/238U年龄介于124~134 Ma之间,加权平均年龄为128±1Ma(MSWD=1.02),属早白垩世。后河岩体是岩石圈拆沉作用的产物,其形成时代处在东秦岭地区广泛而强烈的成岩成矿作用时限内,且显示了Au、Ag、Cu、Mo、W等元素的异常富集,具有较大的内生金属成矿潜力。     

利用铝饱和指数评价中酸性岩浆岩的含矿性——以山西省210个中酸性岩体为例

利用常量元素地球化学特征参与评价岩体的含矿性具有重要意义.通过计算山西境内210个中酸性岩体的铝饱和指数,发现含矿岩体与非矿岩体的铝饱和指数存在一个明显的分界值,即铝饱和指数大于1.7的岩体基本与矿有关,小于此值的岩体绝大多数尚未发现与矿有关.铝饱和指数可能是反映岩体中矿元素活化释放程度或能力的一项重要指标,是本次探讨的重点,对评价其他区域中酸性岩的含矿性有重要参考意义.     

Equilibrium Structures of Differentially Rotating and Tidally Distorted White Dwarf Models of Stars

In this paper we present a method for computing the equilibrium structures and various physical parameters of a primary component of the binary system assuming that the primary is more massive than the secondary and is rotating differentially according to the law of the w² = b₀ + b₁ × s² + b₂ × s⁴, w being the angular velocity of rotation of a fluid element distant s from the axis of rotation and b₀, b₁, b₂ suitably chosen numerical constants. This method utilizes the averaging approach of Kippenhahn and Thomas (1997) and the concept of Roche equipotentials in a manner earlier used by Mohan et al. (1997) to incorporate the effects of rotation and tidal distortions on the equilibrium structures of certain rotationally and tidally distorted stellar models. The use of the method has been illustrated by applying it to obtain the structures and some observable parameters of certain differentially rotating and tidally distorted binary systems whose primary component is assumed to be a white dwarf star.     

A remote sensing environmental study of Haiko Bay——Ⅰ Tidal influx and its changes

Through the water areas extracted from remote sensing images and the combination of the methods for establishing the formula for calculating tidal influx with tidal data, the tidal influx of the Haikou Bay, Hainan Province was found to be 5.14×10⁷m³ in 1990, 5.80×10⁷m³ in 1984 and 5.05×10⁷m³ in 1965, respectively.After the analysis of the morphological and tidal range factors which determine tidal influx, this paper presents the trend of the changes in tidal influx caused by the changes in the morphological factors of the Haikou Bay.It is found that a decreasing trend was shown with a depressive rate of 2×10^-3during the period from 1965 to 1984, and an increasing trend with an incremental rate of 1×10^-3 during the period of 1984-1990.The main reason for the appearance of the decreasing trend before 1984 is the natural deposition and silting-up of the bay sediments; after 1984, the dredging and expansion of the Haikou Port and the Haikou New Port which caused an increase in water area at the mean low tide are the leading factor which causes the increase in tidal influx.     

Mutual Potential of Homogeneous Polyhedra

The mutual gravitational potential between a pair of homogeneous polyhedra is expressed using an infinite series. The nested volume integrals are evaluated analytically and result in simple tensor expressions containing no special functions. However, complexity increases as O(6 ⁿ ), where n is the term degree. An alternate formulation due to Liebenthal is also presented.     

海洋极端环境微生物活动与油气资源关系

为了弄清海洋极端环境下微生物参与油气资源形成和演化的潜在机制, 进行了现代海洋热泉和冷泉等环境中微生物类型分析和生物量估算, 探讨了极端微生物活动和油气资源的潜在关系.认为海洋极端环境下微生物类型主要为细菌和古细菌, 热泉微生物群落主要为异养发酵菌、硫酸盐还原菌、产甲烷菌等; 冷泉微生物群落主要为ANME-2族的厌氧甲烷氧化古细菌、硫酸盐还原细菌和ANME-1族厌氧甲烷氧化古菌.这些极端微生物利用CH₄和H₂S等气体进行能量固定, 有较高的生物丰度和较低的分异度, 具有垂向和水平分带性, 并能营生一套独特的宏体生物.极端微生物活动直接和间接地参与了油气资源的形成和改造, 示踪海底油气资源的变迁.对于探索地球早期海洋微生物活动与油气资源形成, 寻找地史时期或华南地史早期烃源岩具有重要理论和实践指导意义.      

Emission of methane and nitrous oxides from agricultural soils and related global warming potentials of Murshidabad District,West Bengal

Agricultural activities emit substantial amounts of methane (CH4) and nitrous oxides (N2O), the two important greenhouse gases (GHG) with high global warming potentials (GWP). So far, many studies have already been carried out at national and state level, but lack micro‐level (district or block‐level) inventory in India. The present study sheds light on the flux of CH4 and N2O (from all possible sources) from agricultural soil of various blocks in the Murshidabad district, based on the inventory prepared, using the IPCC methodology, with adjusted emission factors and coefficients appropriate for the local level. The economy of the Murshidabad district almost completely rests on agriculture as more than 80 per cent of the population is directly or indirectly dependent on it for their livelihood. Paddy is the dominating crop, cultivated on more than 60 per cent of the gross cropped area. The present work is based on the review of various literature and reports collected from respective state government offices and websites. Results show that CH4 and N2O emission from the agricultural fields are 126.405 Gg and 0.652 Gg respectively for the year 2011?12 with a large scale spatial variation (block‐level) within the district.     

基于城市绿色生产性面积的生态补偿机制研究（英文）

我国城市扩张、粮食保障和能源转型形势严峻,如何挖掘城市建成环境的绿色生产潜力、探索一条通过粮食生产和太阳能利用节约土地空间并缓解生态压力的新途径？本文不同于以往生态补偿研究大多以重点生态功能区为对象或以财税补偿机制为手段,而是创新性地建立了一种城市空间内部的生态补偿机制。本文提出城市“绿色生产性面积”作为一种从城市生态学角度来衡量城市生态承载力提升潜力的方法,它基于将城市绿色资源收入换算成相同条件下它们所能节约的生态足迹面积。首先,通过类型学方法建立绿色生产补偿策略;其次,进行城市建成环境的全要素空间清查及其绿色生产潜力分析;最后,建立不同绿色生产的生态节地效益统一核算标准,并转换为绿色生产性土地面积指标。以天津市南开区学府街道为例,通过可利用的屋顶及闲置用地进行绿色生产,补充了该区12%的建筑所占用的自然土地所能提供的生态承载力。