热红外遥感火星矿物填图方法初步研究及应用     

于艳梅  甘甫平  周萍  闫柏琨 《国土资源遥感》2009,(4):35-39,44

利用热辐射光谱仪（TES）数据,对火星进行热红外遥感矿物填图。通过对几种典型填图方法的简要介绍,结合火星环境及方法的使用条件,对填图结果进行简单比较,初步分析了填图方法的差异性,为火星矿物填图的进一步研究提供了基础,并为方法和模型的进一步改进提供了依据。  相似文献   

Preparation for the solar system observations with Herschel: Simulation of Jupiter observations with PACS     

Hideo Sagawa  Paul Hartogh  Arno de Lange 《Planetary and Space Science》2010,58(13):1692-1698

Observations of the water inventory as well as other chemically important species on Jupiter will be performed in the frame of the guaranteed time key project of the Herschel Space Observatory entitled “Water and related chemistry in the Solar system”. Among other onboard instruments, PACS (Photodetector Array Camera and Spectrometer) will provide new data of the spectral atlas in a wide region covering the far-infrared and submillimetre domains, with an improved spectral resolution and a higher sensitivity compared to previous observations carried out by Cassini/CIRS (Composite InfraRed Spectrometer) and by ISO (Infrared Space Observatory).In order to optimise the observational plan and to prepare for the data analysis, we have simulated the expected spectra of PACS Jupiter observations. Our simulation shows that PACS will promisingly detect several H₂O emission lines. As PACS is capable of spatially resolving the Jovian disk, we will be able to discern the external oxygen sources in the giant planets by exploring the horizontal distribution of water. In addition to H₂O lines, some absorption lines due to tropospheric CH₄, HD, PH₃ and NH₃ lines will be observed with PACS. Furthermore, owing to the high sensitivity of the instrument, the current upper limit on the abundance of hydrogen halides such as HCl will be also improved.  相似文献   

Bathymetrical influences on spatial and temporal characteristics of chlorophyll-a concentrations in the Southern Ocean from 2002 to 2012 (October to March) using MODIS     

Chao Song 《地球空间信息科学学报》2013,16(4):200-211

Phytoplankton blooms, particularly in the Southern Ocean, can have significant impact on global biogeochemistry cycling. To investigate the accuracy of chlorophyll-a distribution, and to better understand the spatial and temporal dynamics of phytoplankton biomass, we examine chlorophyll-a estimates (October–March from 2002 to 2012) derived from Moderate Resolution Imaging Spectrometer (MODIS) data following the ocean chlorophyll-a 3 model (OC3M) algorithm. Noticeable seasonality occurs in the temporal distribution of chlorophyll-a concentrations, which shows the highest value in December and January and an increasing tendency during the 2002–2012 period. The spatial distribution of chlorophyll-a varies greatly with latitude, as higher latitudes experience more phytoplankton blooms (chlorophyll-a concentration larger than 1 mg/m³) and marginal seas (Ross Sea and Amundsen Sea) show different bloom anomalies caused by two dominant algae species. Areas at higher latitudes and shallow water (<500 m) experience the shorter ice-free periods with greater seasonality. A noticeable bathymetry gradient exists at 2500-m isobaths, while water at the 500–2500-m depth experiences quite long ice-free periods with a stable water environment. Blooms generally occur near topographic features where currents have strong interactions when the water depth is more than 2500 m. Based on these findings, we can classify the Southern Ocean into two bloom subregions, 0–500 m as an enhanced bloom zone (EBZ), and 500–2500 m as a moderate bloom zone (MBZ). The EBZ has a quite high-bloom probability of about 30%, while the MBZ has only 10%.  相似文献   

中国南部湿润半湿润丘陵山区不同粒级水系沉积物地球化学特征对比研究   总被引：1，自引：0，他引：1  

陈富荣  史春鸿  梁红霞 《岩矿测试》2017,36(2):136-145

不同景观条件下选取合适的采样粒级是准确地获取地球化学信息,提升地质找矿效果的关键。为研究中国南部湿润半湿润中低山丘陵景观区水系沉积物测量最佳采样粒级,本文在安徽省南部胡乐司—宁国墩地区开展了区域化探采样粒度方法技术试验,采集-60目和-10目~+80目两种粒级样品,采用波长色散X射线荧光光谱法和电感耦合等离子体质谱法为主体的配套分析方案和测试技术获取了全国区域化探扫面规定的40种元素高精度数据。研究表明:两种粒级水系沉积物中造岩元素背景含量与区域岩石背景值基本接近,其他微量元素多呈富集状态,以-10~+80目粒级中As、Au、Hg、Mo、Pb、Sb等成矿元素富集程度最强;-10~+80目粒级受后期表生改造作用影响较弱,最大限度保留了原生地球化学分布特征,并在准确圈定与矿化有关的异常和清晰反映矿致异常特征等方面明显优于-60目粒级。因此,建议在安徽省南部中低山丘陵景观区,选择-10~+80目粒级为水系沉积物测量的最佳采样粒级,研究结果可以为中国相似景观区地球化学勘查找矿水系沉积物测量采样粒级的选择提供参考。  相似文献   

CELIAS - Charge, Element and Isotope Analysis System for SOHO   总被引：1，自引：0，他引：1  

D. Hovestadt  M. Hilchenbach  A. Bürgi  B. Klecker  P. Laeverenz  M. Scholer  H. Grünwaldt  W. I. Axford  S. Livi  E. Marsch  B. Wilken  H. P. Winterhoff  F. M. Ipavich  P. Bedini  M. A. Coplan  A. B. Galvin  G. Gloeckler  P. Bochsler  H. Balsiger  J. Fischer  J. Geiss  R. Kallenbach  P. Wurz  K. -U. Reiche  F. Gliem  D. L. Judge  H. S. Ogawa  K. C. Hsieh  E. Möbius  M. A. Lee  G. G. Managadze  M. I. Verigin  M. Neugebauer 《Solar physics》1995,162(1-2):441-481

The CELIAS experiment on SOHO is designed to measure the mass, ionic charge and energy of the low and high speed solar wind, of suprathermal ions, and of low energy flare particles. Through analysis of the elemental and isotopic abundances, the ionic charge state, and the velocity distributions of ions originating in the solar atmosphere, the investigation focuses on the plasma processes on various temporal and spatial scales in the solar chromosphere, transition zone, and corona. CELIAS includes 3 mass- and charge-discriminating sensors based on the time-of-flight technique: CTOF for the elemental, charge and velocity distribution of the solar wind, MTOF for the elemental and isotopic composition of the solar wind, and STOF for the mass, charge and energy distribution of suprathermal ions. The instrument will provide detailed in situ diagnostics of the solar wind and of accelerated particles, which will complement the optical and spectroscopic investigations of the solar atmosphere on SOHO. CELIAS also contains a Solar Extreme Ultraviolet Monitor, SEM, which continously measures the EUV flux in a wide band of 17 – 70 nm, and a narrow band around the 30.4 nm He II line.Principal-InvestigatorPrincipal-Investigator for data phase  相似文献   

SUMER - Solar Ultraviolet Measurements of Emitted Radiation     

K. Wilhelm  W. Curdt  E. Marsch  U. Schühle  P. Lemaire  A. Gabriel  J. -C. Vial  M. Grewing  M. C. E. Huber  S. D. Jordan  A. I. Poland  R. J. Thomas  M. Kühne  J. G. Timothy  D. M. Hassler  O. H. W. Siegmund 《Solar physics》1995,162(1-2):189-231

The instrument SUMER - Solar Ultraviolet Measurements of Emitted Radiation is designed to investigate structures and associated dynamical processes occurring in the solar atmosphere, from the chromosphere through the transition region to the inner corona, over a temperature range from 10⁴ to 2 × 10⁶ K and above. These observations will permit detailed spectroscopic diagnostics of plasma densities and temperatures in many solar features, and will support penetrating studies of underlying physical processes, including plasma flows, turbulence and wave motions, diffusion transport processes, events associated with solar magnetic activity, atmospheric heating, and solar wind acceleration in the inner corona. Specifically, SUMER will measure profiles and intensities of EUV lines; determine Doppler shifts and line broadenings with high accuracy; provide stigmatic images of the Sun in the EUV with high spatial, spectral, and temporal resolution; and obtain monochromatic maps of the full Sun and the inner corona or selected areas thereof. SUMER will be flown on the Solar and Heliospheric Observatory (SOHO), scheduled for launch in November, 1995. This paper has been written to familiarize solar physicists with SUMER and to demonstrate some command procedures for achieving certain scientific observations.  相似文献