辽东半岛本世纪气温变化的初步研究   总被引：12，自引：1，他引：12  

任国玉  周薇 《气象学报》1994,52(4):493-498

辽东半岛本世纪气温变化的初步研究任国玉，周薇（北京师范大学资源与环境科学系，北京，１００８７５）（辽宁师范大学地理系，大连，１１６０２２）近年来，关于中国地面气温变化的研究已经做了不少工作。由于国内绝大部分测站气象记录时间较短，温度变化的分析主要是集...  相似文献   

全球变化—从言语到现实     

Perry  JS 纪忠平 《大气情报》1991,(26):31-39

  相似文献   

自动站实时数据质量分析及质控算法改进   总被引：1，自引：0，他引：1  

周青  张乐坚  李峰  秦世广  李雁  周薇  刘银锋 《气象科技》2015,43(5):814-822

自动气象站实时资料对于气象预警、决策服务、预报验证等方面具有重要意义,为确保自动站实时资料的科学性和准确性,开展实时资料质量控制工作十分必要。对综合气象观测系统运行监控平台中国家级自动气象站2013年的数据质量情况进行了统计和分析,并基于自动站历史数据研究了特殊天气事件发生时气象要素的变化规律以及要素之间的内部一致性,提出了高湿事件和单站天气突变事件的判断条件以改进自动站质量控制算法,最后给出了新算法的应用情况,结果表明改进后的质控算法有效地降低了数据误判率,取得了较好的控制效果。  相似文献   

深海采矿技术继续缓慢发展     

钟.  JS 《国土资源信息化》1996,(12):29-34

  相似文献   

地质雷达在工程地质调查,环境监测和地质调查方面的应用     

Mell.  JS 王卫萍 《物探化探译丛》1996,(5):15-23

无损技术具有透视固状物体内部及其其下面性状的能力，使其在许多领域起着重要的作用，这些领域也可用有损方法进行调查，如探查混凝土、土壤或基岩时，尽管可以 采用取心或钻孔获得有关地下目标物的详细资料，但这种技术只能在试验井附近的小范围内有效。  相似文献   

Abiologial origin of described stromatolites older than 3.2 Ga     

Buick R  Groves DI  Dunlop JS 《Geology》1995,23(2):191

  相似文献   

Temporal variations in dimethylsulphoniopropionate and dimethyl sulphide in the Zuari estuary,Goa (India)   总被引：1，自引：0，他引：1  

Shenoy DM  Patil JS 《Marine environmental research》2003,56(3):387-402

Despite tropical estuarine systems representing important sites for active biogeochemical processes, studies on dimethyl sulphide (DMS) in these systems are sparse. Here we report on DMS and dimethylsulphoniopropionate (DMSP) variability in relation to physicochemical and biological parameters for a period of 14 months in a tropical estuarine environment. DMS and DMSP showed high temporal variations with maximal concentrations during the southwest monsoon coinciding with a dinoflagellate bloom. Dinoflagellates appear to be the major contributors to the DMSP pool. Average DMS and DMSP concentrations (surface and bottom) suggested that much of the DMSP produced is converted to forms other than DMS. Surface DMS varied between 0.3 and 15.4 nmol dm(-3) while DMSP ranged from 0.8 to 419.5 nmol dm(-3). The DMS flux was 0.03-1.9 microM m(-2) d(-1) (average=0.6 microM m(-2) d(-1)) during the study period, that concurs well with the values reported for temperate estuaries.  相似文献   

Clay-mineral suites,sources, and inferred dispersal routes: Southern California continental shelf     

Hein JR  Dowling JS  Schuetze A  Lee HJ 《Marine environmental research》2003,56(1-2):79-102

Clay mineralogy is useful in determining the distribution, sources, and dispersal routes of fine-grained sediments. In addition, clay minerals, especially smectite, may control the degree to which contaminants are adsorbed by the sediment. We analyzed 250 shelf sediment samples, 24 river-suspended-sediment samples, and 12 river-bed samples for clay-mineral contents in the Southern California Borderland from Point Conception to the Mexico border. In addition, six samples were analyzed from the Palos Verdes Headland in order to characterize the clay minerals contributed to the offshore from that point source. The <2 microm-size fraction was isolated, Mg-saturated, and glycolated before analysis by X-ray diffraction. Semi-quantitative percentages of smectite, illite, and kaolinite plus chlorite were calculated using peak areas and standard weighting factors. Most fine-grained sediment is supplied to the shelf by rivers during major winter storms, especially during El Ni?o years. The largest sediment fluxes to the region are from the Santa Ynez and Santa Clara Rivers, which drain the Transverse Ranges. The mean clay-mineral suite for the entire shelf sediment data set (26% smectite, 50% illite, 24% kaolinite+chlorite) is closely comparable to that for the mean of all the rivers (31% smectite, 49% illite, 20% kaolinite+chlorite), indicating that the main source of shelf fine-grained sediments is the adjacent rivers. However, regional variations do exist and the shelf is divided into four provinces with characteristic clay-mineral suites. The means of the clay-mineral suites of the two southernmost provinces are within analytical error of the mineral suites of adjacent rivers. The next province to the north includes Santa Monica Bay and has a suite of clay minerals derived from mixing of fine-grained sediments from several sources, both from the north and south. The northernmost province clay-mineral suite matches moderately well that of the adjacent rivers, but does indicate some mixing from sources in adjacent provinces.  相似文献   

Cloning and sequence analysis of the self-fertilizing fish Rivulus marmoratus immediate early gene c-fos     

Li Y  Kim IC  Kim YJ  Kim MK  Yoon YD  Lee YS  Lee JS 《Marine environmental research》2004,58(2-5):681-685

We have cloned the proto-oncogene c-fos from a self-fertilizing fish Rivulus marmoratus (Cyprinodontiformes, Rivulidae) after screening of R. marmoratus lambdaGEM-11 genomic DNA library, and sequenced over 12 kb including all exons, introns and the promoter region. The R. marmoratus c-fos gene consisted of one noncoding exon and four exons with high similarity to those of fugu and mammals. We sequenced approximately 7 kb of the R. marmoratus c-fos gene promoter region to gain a better understanding of the molecular anatomy of the immediate response of this gene upon cellular damage. In the promoter region, R. marmoratus c-fos gene has seven xenobiotic response elements (XREs) and eight metal response elements (MREs) as well as two estradiol (E2), 4 NFkappaB, 2 CarG, 2 prolactin (PRL) motifs and one pit1 site, while the 3'-UTR of this gene contains the estrogen response element (ERE). The seven XRE and eight MRE motifs raise the possibility of its regulation by exposure to environmental pollutants. In this paper, we discuss the gene structure of R. marmoratus c-fos gene and compare its promoter region with those of other organisms' c-fos genes. We propose its potential use in ecotoxicology.  相似文献   

Bacterioplanktonic abundance,productivity and petroleum hydrocarbon biodegradation in marinas and other coastal waters in North Carolina,USA     

Piehler MF  Maloney JS  Paerl HW 《Marine environmental research》2002,54(2):157-168

The purpose of this study was to assess the differences in the abundance and activity of the bacterioplankton at sites with varied boating activity, and to determine the response of the communities to additional petroleum pollution. Three sites, including two marinas and a site on Bogue Sound in coastal North Carolina, were selected for monthly experiments. Seasonal patterns of bacterioplanktonic abundance and diesel fuel biodegradation for each site were examined, and possible correlations with intensity of boating activities were explored. Bacterioplanktonic communities at the three sites in this study were more similar in their structure and biodegradation potential than would have been expected from previous studies. We found no differences in the abundance and biodegradation potential of theses communities at the three sites, and only a slightly elevated number of hydrocarbon degraders at one of the marinas. Patterns of biodegradation were more closely related to total bacterial abundance, rather than number of petroleum hydrocarbon degraders. There was a strong seasonal pattern in bacterial abundance and biodegradation at all three sites. The bacterioplanktonic Community at all sites responded similarly to additions of diesel fuel. Bacterial abundance and productivity were both elevated to some extent, and number of petroleum hydrocarbon degraders changed relatively little. These data indicate that marinas may not profoundly after the bacterioplankton and that coastal waters often have resident bacterial communities capable of degrading petroleum hydrocarbon pollution.  相似文献