Retrieving volume FeO and TiO_2 abundances of lunar regolith with CE-2 CELMS data using BPNN method     

Cai Liu  Hong-Yan Sun  Zhi-Guo Meng  Yong-Chun Zheng  Yu Lu  Zhan-Chuan Cai  Jin-Song Ping  Alexander Gusev  Shuo Hu 《天文和天体物理学研究(英文版)》2019,(5)

The volume FeO and TiO_2 abundances(FTAs) of lunar regolith can be more important for understanding the geological evolution of the Moon compared to the optical and gamma-ray results. In this paper, the volume FTAs are retrieved with microwave sounder(CELMS) data from the Chang'E-2 satellite using the back propagation neural network(BPNN) method. Firstly, a three-layered BPNN network with five-dimensional input is constructed by taking nonlinearity into account. Then, the brightness temperature(TB) and surface slope are set as the inputs and the volume FTAs are set as the outputs of the BPNN network.Thereafter, the BPNN network is trained with the corresponding parameters collected from Apollo, Luna,and Surveyor missions. Finally, the volume FTAs are retrieved with the trained BPNN network using the four-channel TBderived from the CELMS data and the surface slope estimated from Lunar Orbiter Laser Altimeter(LOLA) data. The rationality of the retrieved FTAs is verified by comparing with the Clementine UV-VIS results and Lunar Prospector(LP) GRS results. The retrieved volume FTAs enable us to re-evaluate the geological features of the lunar surface. Several important results are as follows. Firstly, very-low-Ti(1.5 wt.%) basalts are the most spatially abundant, and the surfaces with TiO_2 5 wt.% constitute less than 10% of the maria. Also, two linear relationships occur between the FeO abundance(FA) and the TiO_2 abundance before and after the threshold, 16 wt.% for FA. Secondly, a new perspective on mare volcanism is derived with the volume FTAs in several important mare basins, although this conclusion should be verified with more sources of data. Thirdly, FTAs in the lunar regolith change with depth to the uppermost surface,and the change is complex over the lunar surface. Finally, the distribution of volume FTAs hints that the highlands crust is probably homogeneous, at least in terms of the microwave thermophysical parameters.  相似文献   

Source scaling of intermediate-depth Vrancea earthquakes   总被引：3，自引：0，他引：3  

A. Gusev  M. Radulian  M. Rizescu  G. F. Panza 《Geophysical Journal International》2002,151(3):879-889

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Simulating present-day climate with the INMCM4.0 coupled model of the atmospheric and oceanic general circulations   总被引：5，自引：0，他引：5  

E. M. Volodin  N. A. Dianskii  A. V. Gusev 《Izvestiya Atmospheric and Oceanic Physics》2010,46(4):414-431

The INMCM3.0 climate model has formed the basis for the development of a new climate-model version: the INMCM4.0. It differs from the previous version in that there is an increase in its spatial resolution and some changes in the formulation of coupled atmosphere-ocean general circulation models. A numerical experiment was conducted on the basis of this new version to simulate the present-day climate. The model data were compared with observational data and the INMCM3.0 model data. It is shown that the new model adequately reproduces the most significant features of the observed atmospheric and oceanic climate. This new model is ready to participate in the Coupled Model Intercomparison Project Phase 5 (CMIP5), the results of which are to be used in preparing the fifth assessment report of the Intergovernmental Panel on Climate Change (IPCC).  相似文献   

Basic physicochemical characteristics of the state of Upper Amur surface water     

S. M. Radomskii  V. I. Radomskaya  E. B. Matyugina  M. N. Gusev 《Water Resources》2007,34(1):60-69

The present-day ecological state of the Upper Amur is assessed. Specific features of water quality formation are demonstrated. Local sources of aquatic environment pollution are identified. The distributions of metals in dissolved and suspended forms in the river reach are examined.  相似文献   

Studying the effect of different approaches to estimating model parameters on the accuracy of river runoff simulation by SWAP model     

E. M. Gusev  O. N. Nasonova 《Water Resources》2007,34(3):277-286

Different approaches to estimating the parameters of SWAP physically based model, which describes heat and water transfer processes in the soil-vegetaion (snow) cover-atmosphere system are examined. In particular, two methods of a priori estimation of parameter values and two variants of their calibration are discussed. The parameter sets obtained by different methods were used to simulate the runoff from 12 experimental catchments in the eastern USA. The calculations were conducted for a 39-year period (1960–1998) with a 3-hour step. The results of calculations were compared with each other and with measured river runoff values in order to identify the parameter set that is optimal for runoff evaluation. A strategy is proposed for a priori parameter estimation in the case of basins where observational data are too poor to enable parameter calibration.  相似文献   

BVRI CCD photometry of the peculiar galaxies NGC 5605 and NGC 5665     

B. P. Artamonov  Yu. Yu. Badan  A. S. Gusev 《Astronomy Reports》2000,44(9):569-578

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Simulation of seasonal anomalies of atmospheric circulation using coupled atmosphere-ocean model     

M. A. Tolstykh  N. A. Diansky  A. V. Gusev  D. B. Kiktev 《Izvestiya Atmospheric and Oceanic Physics》2014,50(2):111-121

A coupled atmosphere-ocean model intended for the simulation of coupled circulation at time scales up to a season is developed. The semi-Lagrangian atmospheric general circulation model of the Hydrometeorological Centre of Russia, SLAV, is coupled with the sigma model of ocean general circulation developed at the Institute of Numerical Mathematics, Russian Academy of Sciences (INM RAS), INMOM. Using this coupled model, numerical experiments on ensemble modeling of the atmosphere and ocean circulation for up to 4 months are carried out using real initial data for all seasons of an annual cycle in 1989–2010. Results of these experiments are compared to the results of the SLAV model with the simple evolution of the sea surface temperature. A comparative analysis of seasonally averaged anomalies of atmospheric circulation shows prospects in applying the coupled model for forecasts. It is shown with the example of the El Niño phenomenon of 1997–1998 that the coupled model forecasts the seasonally averaged anomalies for the period of the nonstationary El Niño phase significantly better.  相似文献   

Scaling properties of corner frequencies of Kamchatka earthquakes     

A. A. Gusev  E. M. Guseva 《Doklady Earth Sciences》2014,458(1):1112-1115

Scaling properties of earthquake populations bear the major information on the physics of the source process of an earthquake. To determine scaling properties, source spectra of more than 400 earthquakes of Kamchatka were determined in a frequency range 0.1–30 Hz using materials of digital registration of PET station, and characteristic frequencies of earthquakes were estimated. The range of magnitudes is 4–6.5, the range of distances is 80–220 km. To enable reduction of a spectrum to the source, attenuation properties of the medium around PET were determined beforehand. It is revealed that source spectra show several corner (characteristic) frequencies: f _c1, f _c2 and f _c3; where the spectral trend changes: from f ⁰ to f ^?1, from f ^?1 to f ^?2, and from f ^?2 to f ^?3, respectively. Although in some cases f _c1 ≈ f _c2 in agreement with the usual ω^?2 spectral model, the main part of spectra has more complicated character. For a large part of the studied earthquakes a source-controlled upper cutoff of acceleration spectrum, or corner frequency f _c3, is observed. This is an important fact, as the existence of f _c3 (source-controlled f _max) is not recognized in the bulk of the seismological literature. For f _c1, the observed scaling agrees with the usual hypothesis of similarity of the earthquake sources of different size (magnitude); it is close to f _c1 ～ M ₀ ^?1/3 , where M ₀ is seismic moment. For f _c2, scaling is close to f _c2 ～ M ₀ ^?0.17 ～ f _c1 ^0.5 , that indicates an expressed violation of similarity. For f _c3, scaling is close to f _c2 ～ M ₀ ^?0.08 ～ f _c1 ^0.25 , so that similarity is broken even sharper in this case. Hypotheses about possible causes of the observed scaling are discussed.  相似文献   

Descriptive statistical model of earthquake source radiation and its application to an estimation of short-period strong motion   总被引：9，自引：0，他引：9  

A. A. Gusev 《Geophysical Journal International》1983,74(3):787-808

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The First Version of the Amax (MW , R) Relationship for Kamchatka     

A. A. Gusev  E. I. Gordeev  E. M. Guseva    A. G. Petukhin  V. N. Chebrov 《Pure and Applied Geophysics》1997,149(2):299-312

—To estimate for the first time the typical relation between peak acceleration A _max?, moment magnitude M _W and hypocentral distance R for Kamchatka, 101 analog strong motion records for 1969–1993 were employed as the initial data set. Records of acceleration and velocity meters were obtained at 15 rock to medium-ground Kamchatkan sites from 33 earthquakes with M _W = 4.5–7.8, at R = 30–250?km. A _max values were determined from "true" acceleration time histories calculated by spectral deconvolution of digitized records. The maximum value over the two horizontal components was used as the A _max value in the further analysis. With the scarce data available, there were no chances to determine reliably the whole A _max?(M _W ?,?R) average surface; thus the shape of this trend surface was determined on a theoretical basis and only the level was fitted to the data. The theoretical model employed included: (1) source spectrum: according to the Brune's spectral model; (2) point-source attenuation: as 1/R plus loss specified by Q(f) = 250?f ^0.8; (3) finite-source correction for a disc-shaped incoherent source, its size depending on M _W ?; (4) accelerogram duration: including source-dependent and distance-dependent terms; (5) A _max value: based on random process representation. Distance trends calculated with this model agree with the empirical ones of FUKUSHIMA and TANAKA (1990). To calculate the absolute level for these trends, observed A _max?(M _W ?,?R) values were reduced to M _W = 8, R = 100?km using the theoretical trends as reference. The median of the reduced values, A _max?(8,?100), equal to 188?gal. was taken as the absolute reference level for the relation we sought. Note that in the process of data analysis we were forced to entirely reject relatively abundant data of two particular stations because of their prominent local amplification (×5.5) or deamplification (×0.45).  相似文献