The concentration and distribution of dimethyl sulfide in the marine atmospheric boundary layer near the equator     

Li Xingsheng  Li Zhe  F. Parungo  C. Nagamoto 《海洋学报(英文版)》1995,14(3):355-369

Ｔｈｅｃｏｎｃｅｎｔｒａｔｉｏｎａｎｄｄｉｓｔｒｉｂｕｔｉｏｎｏｆｄｉｍｅｔｈｙｌｓｕｌｆｉｄｅｉｎｔｈｅｍａｒｉｎｅａｔｍｏｓｐｈｅｒｉｃｂｏｕｎｄａｒｙｌａｙｅｒｎｅａｒｔｈｅｅｑｕａｔｏｒ￥ＬｉＸｉｎｇｓｈｅｎｇ；ＬｉＺｈｅ；Ｆ．Ｐａｒｕｎｇｏ...  相似文献   

南海季风区地域性大气环流的结构     

周发琇  张涛  高荣珍 《中国海洋大学学报(自然科学版)》2001,31(4):467-472

作者使用 NCEP/ NCAR再分析资料 ,在热带 30°S～ 30°N纬带用谐波分析方法分离出超长波之后 ,再采用环流诊断方法 ,发现南海季风区存在地域性环流系统。文中给出冬、夏季风期该系统的三维空间结构和相应的热源分布 ,讨论了该地域性环流系统对南海季风气候及其异常的作用 ,并探讨夏季风爆发北部先于南部的一种可能的气候原因。  相似文献   

Wave-induced porewater pressure in a seabed with inhomogeneous permeability     

Toshikazu Kitano  Hajime Mase 《Ocean Engineering》2001,28(3)

We have developed an analytical treatment for the wave-induced response of a seabed with inhomogeneous permeability, by employing the boundary layer approximation. By assuming an exponential function for vertically distributed permeability, the inhomogeneous consolidation equation was formulated as Bessel's differential equation. Subsequently, we proposed some representative quantities for examining the effects of inhomogeneity of permeability. The main effects of inhomogeneity are that the boundary layer becomes thinner and the phase delay in the direction of depth becomes larger as the inhomogeneity becomes significant. In addition, it was shown that the boundary layer is properly evaluated by using the averaged permeability.  相似文献   

电磁波信号在对流层中路径弯曲改正的级数展开式     

卢小平 《测绘学报》2008,37(2):0-249

大气折射延迟是空间大地测量中的一个主要误差源。本文严格地给出了中性大气路径弯曲改正的原理性公式。通过对各种因素量级的分析,在亚毫米量级的精度上给出了一个以视天顶距正切和正割乘积为参数的级数展开模型。新模型在球对称大气模型下,级数展开模型的精度达到了毫米量级,理论上可以展开到任意阶次,且可允许观测高度角小到5°。  相似文献   

CHRIS／PROBA高光谱数据的预处理   总被引：1，自引：0，他引：1  

盖利亚  刘正军  张继贤 《测绘工程》2008,17(1):40-43

针对CHRIS／PROBA高光谱遥感数据的特点,对CHRIS影像进行去条带处理、辐射校正、大气校正等预处理,获得较好质量的影像,为影像的进一步分析和实际应用提供保障。  相似文献   

太原盆地农田区大气降尘对土壤重金属元素 累积的影响及其来源探讨   总被引：1，自引：0，他引：1  

赖木收  杨忠芳  王洪翠  周继华  王建武 《地质通报》2008,27(2):240-245

通过研究太原盆地大气干湿沉降中重金属元素的含量分布特征及年输入通量,讨论其对土壤中重金属元素累积的影响。同时采用富集因子法探讨降尘物质的来源。研究结果表明,降尘中重金属元素As、Cd主要来源于人为活动,Pb的来源可能是人为源和自然源。而Hg则主要来源于自然源。  相似文献   

Whistler observations of the quiet time plasmasphere-ionosphere coupling fluxes at low latitude     

Lalmani  R. P. Singh  Rajesh Singh  Altaf Ahmad 《Earth, Moon, and Planets》1996,74(1):7-15

Observations of whistlers during quiet times made at low-latitude ground station Nainital (geomag. lat. 19 1 N) are used to deduce plasmasphere-ionosphere coupling fluxes. The whistler data from 3 magnetically quiet days are presented that show a smooth decrease in dispersion with time. This decrease in dispersion is interpreted in terms of a corresponding decrease in electron content of tubes of ionization. The electron densities, electron tube contents (10¹⁶ el/m²-tube) and coupling fluxes (10 el m^–1 s^–2) are computed by means of an accurate curve fitting method developed by Tarcsai (1975) and are in good agreement with the results reported by other workers.  相似文献   

The effects of solar and ionospheric parameters on seasonal variation of 6300 Å line emission at Calcutta     

S. K. Midya  R. Chattopadhyay 《Earth, Moon, and Planets》1996,74(2):123-129

The purpose of this paper is to find correlation between OI 6300 Å line intensity with solar and ionospheric parameters. A critical study have been made and the following important results are obtained:

(i)	Solar flare index plays more important role for the emissions of 6300 Å line than other solar parameters.
(ii)	Intensity of 6300 Å line increases linearly with the increase of solar flare index.
(iii)	Virtual height plays more important role than critical frequency for the emission of 6300 Å line-intensity.
(iv)	Possible explanation of this type of variation is also presented.

  相似文献   

Laboratory study of the rates and products of the phototransformations of naphthalene adsorbed on samples of titanium dioxide,ferric oxide,muscovite, and fly ash     

Chantal Guillard  Hervé Delprat  Can Hoang-van  Pierre Pichat 《Journal of Atmospheric Chemistry》1993,16(1):47-59

The photodegradation of naphthalene (NPH), chosen as a model of polynuclear aromatic pollutants, has been studied in the presence of a layer of four water-insoluble inorganic solids which can be found in the troposphere (TiO₂, Fe₂O₃, muscovite, and a fly ash sample). Direct photolysis of NPH is negligible at >340 nm. Dark adsorption of NPH on TiO₂ (mainly anatase, nonporous, 50 m² g^–1) at 293 K corresponds to a surface coverage ofca. 50% at equilibrium. Under these conditions (saturated surface), the stationary-state photocatalytic degradation reaches 0.4 molecule nm^–2 h^–1 (>340 nm, radiant fluxca. 22 mW cm^–2). Dioxygen is required and its partial pressure in air is such that the degradation is zero order in O₂. Water vapor markedly increases the rate. The other particulates have also an effect, less important than that of TiO₂, however quite noticeable with respect to surface area unit for the fly ash sample which contains 3.2% Fe₂O₃. Apart from 1,4-naphthoquinone, which is the main intermediate product in all cases, 2-naphthol, phthalide, phthaldialdehyde, phthalic acid, acetophenone, benzaldehyde, benzoic acid are also formed on dry TiO₂. Depending on their volatility, these compounds are transferred to the gas phase or remain principally adsorbed on the solid particles where they are further transformed. For instance, phthalic acid (or anhydride) and benzoic acid are generated from 1,4-naphthoquinone. Degradation mechanisms are briefly discussed.  相似文献   

我国风云极轨气象卫星及应用进展     

何锡玉  蔡夕方  朱亚平  张雷 《气象科学进展》2021,(1)

我国风云极轨气象卫星数据,目前已经被应用在天气预报、气候预测、自然灾害、环境监测、科学研究等多个重要领域,为我国国民经济建设、国防建设、防灾减灾和全球许多国家的经济发展做出了重要贡献。本文介绍了我国风云极轨气象卫星的发展历程,重点阐述了目前风云极轨气象卫星在卫星数据预处理、定量产品反演、卫星资料同化等方面的应用研究进展,并展示了第二代风云极轨气象卫星在全球业务观测、大气三维探测、海洋环境监测、数值预报应用等相关典型应用。在国家创新战略发展框架下,根据“国家级气象现代化总体方案”确定的2020年气象卫星及应用发展目标,第二代极轨气象卫星风云三号03批卫星系统工程必将进一步发挥重大支撑作用。  相似文献