Cross-Correlation of Tenerife Data with Galactic Templates-Evidence for Spinning Dust?

The recent discovery of dust-correlated diffuse microwave emission has prompted two rival explanations: free-free emission and spinning dust grains. We present new detections of this component at 10 and 15 GHz by the switched-beam Tenerife experiment. The data show a turnover in the spectrum and thereby support the spinning dust hypothesis. We also present a significant detection of synchrotron radiation at 10 GHz, which is useful for normalizing foreground contamination of cosmic microwave background experiments at high galactic latitudes.     

光化学烟雾的形成、危害及防治

光化学烟雾是大气污染的一种，它不仅危害人们的健康，而且严重威胁着生态系统的平衡。本文从光化学烟雾的形成机理、日变化曲线、危害及对其的防治对策等方面进行阐述，以便大家能够对光化学烟雾有一个完整、系统的认识。     

省气象学会成立卅周年庆祝大会在西安召开

一九八九年十一月二十一日至二十二日,省气象学会成立三十周年庆祝大会在西安召开。学会历理事长,本届理事、各专业委员会主任,以及省气象局、民航、部队、院校等单位的代表近六十人加了会议。省科协、省气象局党组派代表到会祝贺并指导会议召开,中国气象学会发来了贺信。     

臭氧层的最新情况

臭氧层的最新情况ＲｕｍｅｎＤ．Ｂｏｊｋｏｖ以往的国际臭氧评价──ＷＭＯ臭氧报告第１６号（１９９８）、第２０号（１９９０）和第２５号（１９９１）──以及收编在１９９４年评价中的最新研究已表明：从７０年代初期开始，两半球中纬度和极地地区的臭氧总量都有显著...     

基于遥感技术的开滦煤矿地面塌陷积水动态监测

利用MSS、TM/ETM及CBERS-2数据，对开滦煤矿地面塌陷积水进行了动态监测。通过对4个时相遥感信息的提取，得到了28 a 来开滦煤矿地面塌陷积水的动态信息。结果表明，遥感技术是对矿区地面塌陷积水进行监测的一种很好的方法，在矿区积水信息的 提取中采用CBERS-2数据，可以取得较好的效果。     

Evaluating climate variability and pumping effects in statistical analyses

As development of ground water resources reaches the limits of sustainability, it is likely that even small changes in inflow, outflow, or storage will have economic or environmental consequences. Anthropogenic impacts of concern may be on the scale of natural variability, making it difficult to distinguish between the two. Under these circumstances, we believe that it is important to account for effects from both ground water development and climate variability. We use several statistical methods, including trend analysis, cluster analysis, and time series analysis with seasonal decomposition, to identify climate and anthropogenic effects in regional ground water levels and spring discharge in southern Nevada. We discuss the parameterization of climate and suggest that the relative importance of various measures of climate provides information about the aquifer system response to climate. In our system, which may be characteristic of much of the arid southwestern United States, ground water levels are much more responsive to wet years than to dry years, based on the importance of selected climate parameters in the regression. Using cluster analysis and time series seasonal decomposition, we relate differences in amplitude and phase in the seasonal signal to two major forcings—climate and pumping—and distinguish between a regional recharge response to an extremely wet year and a seasonal pumping/evapotranspiration response that decays with distance from the pumping center. The observed spring discharge data support our hypothesis that regional spring discharge, particularly at higher elevation springs, is sensitive to relatively small ground water level changes.     

The Distances of Subclusters in the Virgo Area

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅＶｉｒｇｏｃｌｕｓｔｅｒｏｆｇａｌａｘｉｅｓｉｓｔｈｅｎｅａｒｅｓｔｙｏｕｎｇｒｉｃｈｃｌｕｓｔｅｒａｎｄｐｌａｙｓａｓａｃｒｉｔｉｃａｌｒｏｌｅｎｏｔｏｎｌｙｉｎｔｈｅｆｏｒｍａｔｉｏｎａｎｄｅｖｏｌｕｔｉｏｎｏｆｇａｌａｘｙｃｌｕｓｔｅｒ ,ｂｕｔａｌｓｏｉｎｃａｌｉｂｒａｔｉｎｇｔｈｅｃｏｓｍｏｌｏｇｉｃａｌｄｉｓ ｔａｎｔｓｃａｌｅ(ｖａｎｄｅｎＢｅｒｇｈ ,1 994) .Ｔｈｅｒｅａｒｅａｌｏｔｏｆｒｅｓｅａｒｃｈｗｏｒｋｓｔｈａｔｆｏｃｕｓｏｎｔｈｅｄｅｔｅｒｍ…     

海底流体排出及甲烷水合物BSR形成机理

在大陆边缘海底之下几百米深度处普遍观察到BSR,这些沉积物经历近的构造固红或快速堆积,相信BSR与稳定的甲烷水合物（笼形物）的最深部位对应,我们提出了下模式,BSR水合物的形成是在运移着的孔隙流体进水合物稳定域时,由向上运移的孔隙流体排出甲烷,在这个模式里,大多数甲烷产生于水合物稳定带之下,但此深度不足以充分生热,甲烷初始属生物成因,该模式要求从孔隙流体中排出已分解的甲烷,或随孔隙流体向上搬运已散布的游离气,模式解释证据,水合物在稳定域底界处浓聚,大量的甲烷源包含在水合物内,BSRs仅在特殊环境下出现,在深积物正常沉积体制下,不会向上强裂排出流体进入不合物稳定域,,所以BSRs不普遍,由于俯冲带增生楔处构造加厚,荷载增加,引致流体向上排出,该地区快速沉积未固结成岩,这些地区水合物BSRs常见,当孔隙流体进入水合物流体＋水合物与流体域之间的严格边界,然而,需要形成水合物的甲烷数量源自深海钻井有关孔隙流体中烷浓度的有限资料暗示,从上升流体中有效的排出甲烷,可以包含比所需产生游离气的数量少,在大多数流体排出体制,流体向上运移至海底的数量足够连续排出过剩的氯化物及水合物形成时同位素分离的残余物,因此,当观察钻孔资料,没有大量氯化物或同位素异常残留在孔隙流体内,甲烷浓度与稳定域上或下的孔隙流体内CO2量之差别,可以对早期沉积物成岩反应有明显的影响。     

基于PSR模型的珠江口海域富营养化特征与评价

本研究依据2020年4月(春季)和2020年10月(秋季)珠江口海域的调查数据,根据“压力-状态-响应”(PSR)模型对珠江口海域进行富营养化状况评价,并通过主成分分析以及相关性分析来说明各环境因子对珠江口富营养化的影响。结果表明：在“优、良、中、差、劣”5个富营养化等级中,珠江口PSR综合评价等级为“差”等级,近几年内变化趋于稳定。有机污染物与营养盐对珠江口富营养化的影响较大,其次为叶绿素a和溶解氧。珠江口营养盐与盐度呈显著负相关,与叶绿素a呈显著正相关。周边城市的陆源排放输入是导致珠江口富营养化的主要因素,河口稀释混合作用以及浮游植物对珠江口的富营养化程度有影响。