大气层臭氧损耗与紫外辐射对海洋浮游植物的影响   总被引：2，自引：0，他引：2       下载免费PDF全文

杨和福  G.O.Kirst 《极地研究》2000,12(1):40-61

人类活动产生的氟氯烃等化合物对大气的污染造成臭氧损耗 ,引起地面紫外辐射 ( UV-B)增加 ,进而造成对生物的有害影响。根据作者近年来的研究和国际上的相关研究进展 ,本文就“臭氧洞”形成和紫外辐射增加对海洋浮游植物影响的关键所在 ,即紫外辐射对海洋浮游植物的生化效应 ,包括海洋生物对 UV- B的忍耐性和抵御能力、UV- B对海洋浮游植物细胞内、外生化环境的影响等 ,作一综述。  相似文献   

CaII K imaging to understand UV irradiance variability     

R. Kariyappa 《Journal of Astrophysics and Astronomy》2000,21(3-4):293-297

To identify and understand the underlying physical mechanisms of total solar and UV irradiance variability and to estimate the contribution of various chromospheric features to UV irradiance, detailed analysis of spatially resolved data is required. The various chromospheric features have been segregated and different parameters have been derived from CaII K Spectroheliograms of NSO/Sac Peak and Kodaikanal Observatory and compared with UV irradiance flux measured in MgII h and k lines by NOAA 9 satellite. The important results of this detailed analysis of CaII K Images of 1992 together with UV irradiance data will be discussed in this paper.  相似文献   

Comparison of HTC method and UV/persulphate method to determine colloidal organic carbon in seawater   总被引：1，自引：0，他引：1  

王江涛  赵卫红  谭丽菊  张正斌 《中国海洋湖沼学报》2000,18(1):80-84

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淡水中对紫外光敏感的磷化合物研究简述     

周易勇  付永清  李建秋 《湖泊科学》2000,12(2):178-181

湖泊、沼泽与河流等淡水生态系统中在的一些对紫外光敏感的磷化合物,它们在紫外光（或太阳光）的作用下释放正磷酸根。本文对其形成释放机制、生态学意义以及铁和腐殖质的调节作用等作了扼要的综述。  相似文献   

Alkaline Degradation of Dissolved Organic Matter     

Thomas Brinkmann  Gudrun Abbt‐Braun  Fritz H. Frimmel 《洁净——土壤、空气、水》2003,31(3):213-224

The degradation of dissolved organic matter (DOM) was studied in alkaline solution. The products were characterised using UV/vis spectroscopy, size‐exclusion chromatography (SEC), and by the analysis of low‐molecular‐weight organic acids (LMWOA). The degradation experiments were performed with water from a brown water lake or its isolated fulvic acid fraction and sodium hydroxide at different reaction times and temperatures. Depending on the wavelength and the reaction time, the UV/vis absorbance between 230 nm and 600 nm increased or decreased. The behaviour of model compounds during reactions in alkaline media was compared to the UV/vis spectroscopic behaviour of DOM. The release of LMWOA was described by kinetic data and compared to the data of model reactions. Evidence was given for the carboxylic esters playing a significant role in the release of LMWOA only during the beginning of the alkaline degradation. The results gained by SEC with on‐line UV and DOC detection showed that the average size of DOM was decreasing, and that a major part of the degradation products consisted of low‐molecular‐weight mono‐ and dicarboxylic acids.  相似文献   

昆明下半年紫外辐射变化及与云的关系分析     

郭世昌  常有礼  李豪杰 《云南地理环境研究》2005,17(1):1-4,23

依据2003年8月1日到2003年12月31日同步观测得到的地面紫外辐射资料,分析了紫外辐射的变化特征。结果显示,在实际天气条件下,紫外辐射变化没有我们所认为的那种有特别明显的规律。云对到达地面的紫外辐射可能有着十分复杂和重要的作用。  相似文献   

用原子吸收仪进行钛的紫外分光光度测定   总被引：1，自引：0，他引：1  

杨重九 《岩矿测试》2001,20(3):234-236

在原子吸收仪上添置了一个自制的简易比色皿托架，成功地利用原子吸收仪进行TiO2与二安替比林甲烷显色的分光光度测定。  相似文献   

长春地区紫外光谱（UV-A，UV-B）辐射观测和初步分析   总被引：22，自引：4，他引：22  

吕达仁  李卫  李福田  唐玉国  马海涛 《大气科学》1996,20(3):343-351

利用我们研制的太阳—大气紫外光谱辐射计，从1992年5月在长春开始试验了野外观测，监视到达地表的太阳直射和大气散射紫外光谱辐射，主要给出长春地区地面紫外辐射，特别是紫外（UV）B段（280～320 nm）光谱辐射的一些基本特点和初步统计特征。由于地表UV-B辐射对生态系统和人类健康有危害作用，其强度随着臭氧减少而增加。该项观测分析将有助于监测和研究臭氧层变薄的实际效应。  相似文献   

The NO2 Absorption Spectrum. IV: The 200–400 nm Region at 220 K     

M. F. Merienne  A. Jenouvrier  B. Coquart  J. P. Lux 《Journal of Atmospheric Chemistry》1997,27(3):219-232

Previous experiments in the 400–500 nm region (Coquart et al., 1995) have been extended to the 200–400 nm region to determine the absorption cross-sections of NO₂ at 220 K. The NO₂ and N₂O₄ cross-sections are obtained simultaneously from a calculation applied to the data resulting from measurements at low pressures. A comparison between the NO₂ cross-sections at 220 K and at ambient temperature shows that the low temperature cross-sections are generally lower, except in the region of the absorption peaks. Comparisons are also made with previous data at temperature close to 220 K.  相似文献   

北京地面紫外辐射（光谱）的观测与分析   总被引：13，自引：0，他引：13       下载免费PDF全文

刁丽军  顾松山  王普才  刘春田  陈洪滨 《气象科学》2003,23(1):22-30

通过对北京大气物理研究所与长春光机所合作研制的地基太阳紫外辐射光谱仪观测资料的分析，和用辐射传输模式UVSS计算的结果，对影响到达地面的UVB辐照度的主要因子太阳高度角（SZA）、臭氧总量和地表反照率进行了分析研究。最后对紫外光谱仪的观测资料做了总量和谱分析。  相似文献