Member 1 of Yongji Formation(Ey1) sedimentary characteristics and its origin analysis in Yitong Graben

Ey1 has the unique desultory-weak or gap seismic reflection structure as its one of the most important characteristics.It is very important to clarify sedimentary characteristics and its origin for Yitong Graben and its sedimentary facies and tectonic evolution.On the basis of the research of core analyses,well logging data analyses,sedimentary facies analyses and seismic reflection structure analyses,the authors have concluded the sedimentary characteristics of Ey1,and have carried out Ey1 sedimentary environments and its origin.The result shows that Ey1 desultory-weak or gap seismic reflection may be a series of small scale secondary sediment fans superimposition.     

Comparison between cryptospores from the Cambrian Log Cabin Member,Pioche Shale,Nevada,USA and similar specimens from the Cambrian Kaili Formation,Guizhou,China

Abundant cryptospore-like microfossils have been collected from a sample of the"Middle"Cambrian Log Cabin Member of the Pioche Shale in eastern Nevada,USA.Compared with organic-walled microfossils obtained from the Cambrian Kaili Formation in eastern Guizhou Province,China,some specimens of leiosphers may be inferred to be similar cryptospore-like microfossils.The new fossil record would be the oldest known specimens of cryptospore-like microfossils during the Cambrian Period.     

Deep-seated structure and gold content of Russia and China contiguous territories

On the contiguous territories of southeastern Russia and northeastern China,many gold-bearing areas are conjugate in space with the gradient zones of the gravity field.Large gold-ore districts,defining in many respects the metallogenic signature of the region,are located on the joints of differently oriented gradient zones.In the best-studied districts,the Precambrian protrusions,staged distribution of magmatic chambers (by vertical) above the Mohorovicic discontinuity and restriction to the peripheral parts of intrusive massifs have been recognized.Different-type gold deposits in the studied ore-placer districts and nodes are often located on the areas of joint of the granitoid massifs and subvolcanic bodies with depressions.Availability of areals of metasomatic alterations of rocks,placers,and ore occurrences of precious metals on such but poorly studied areas can serve as the basis for the revision and detailed forecasting-prospecting works to develop the mineral-raw material base of the region for precious metals.     

Water quality and eutrophication in the Guangzhou Sea Zone of the Pearl River estuary

To gain a better understanding of water quality and eutrophication,we investigated the seasonal and spatial distribution of water quality at 17 stations in the Guangzhou Sea Zone (GZSZ).Nutrients,chlorophyll-a (Chl-a),salinity,chemical oxygen demand,and other physical and chemical parameters were determined in February,May,August and October from 2005 to 2007.The concentrations showed ranges of 93.2-530.4 μmol/L for dissolved inorganic nitrogen (DIN),0.62-3.16 μmol/L for phosphate (PO4-P) and 50-127 μmol/L ...     

Profile of Chief Editor of Sciences in Cold and Arid Regions

1. Biographical information GuoDong Cheng, born on 11 July, 1943, in Shanghai, China, received his Bachelor of Science in 1965, from the Department of Hydrogeology and Engineering Geology at Beijing Geology College （now China University of Geosciences）. In the same year, he started his research career at the Lanzhou Institute of Glaciology, Geocryology, and Desert Research, Chinese Academy of Sciences （CAS）. Over the past 45 years, Professor Cheng has published more than 200 papers in peer-reviewed professional journals and     

Profile of Chief Editor of Sciences in Cold and Arid Regions

1. Biographical information GuoDong Cheng, born on 11 July, 1943, in Shanghai, China, received his Bachelor of Science in 1965, from the Department of Hydrogeology and Engineering Geology at Beijing Geology College （now China University of Geosciences）. In the same year, he started his research career at the Lanzhou Institute of Glaciology, Geocryology, and Desert Research, Chinese Academy of Sciences     

Retrieving capillary-gravity wave spectrum from polarimetric microwave radiation of ocean surface

A new simple two-scale model on the polarimetric microwave emission of ocean surface is derived at first, which can be ex-pressed as an integral of weighting functions (M0 and M2) and ocean surface curvature spectrum coefficients (C0 and C2). This provides a simple way to investigate the effect of curvature spectrum on ocean emission. It is found that ocean waves with wavelengths both comparable to and much greater than the electromagnetic wavelength can contribute to the harmonics of ocean surface microwav...     

The April 14th, 2010 Yushu earthquake, a devastating earthquake with foreshocks

In the early morning of April 14th, 2010, a strong earth- quake (Ms7.1, http://www.csndmc.ac.cn; Mw6.9, http://neic. usgs.gov) occurred in Yushu district, Qinghai Province, China. More than 2000 lives were lost and over 100000 injured,     

A one-dimensional heat transfer model of the Antarctic Ice Sheet and modeling of snow temperatures at Dome A, the summit of Antarctic Plateau

A vertical one-dimensional numerical model for heat transferring within the near-surface snow layer of the Antarctic Ice Sheet was developed based on simplified parameterizations of associated physical processes for the atmosphere, radiation, and snow/ice systems. Using the meteorological data of an automatic weather station (AWS) at Dome A (80°22′S, 70°22′E), we applied the model to simulate the seasonal temperature variation within a depth of 20 m. Comparison of modeled results with observed snow temperat...     

An emission source inversion model based on satellite data and its application in air quality forecasts

This paper aims at constructing an emission source inversion model using a variational processing method and adaptive nudging scheme for the Community Multiscale Air Quality Model (CMAQ) based on satellite data to investigate the applicability of high resolution OMI (Ozone Monitoring Instrument) column concentration data for air quality forecasts over the North China. The results show a reasonable consistency and good correlation between the spatial distributions of NO2 from surface and OMI satellite measur...