Climatic changes and alluvial-sedimentation settings in southeastern Transbaikalia in the Middle-Late Holocene (by the example of the Ilya floodplain)     

V.B. Bazarova  L.M. Mokhova  M.A. Klimin  L.A. Orlova  K.Yu. Bazarov 《Russian Geology and Geophysics》2008,49(12):978-985

Climatic changes in southeastern Transbaikalia in the Middle and Late Holocene and their influence on alluvial sedimentation environments are reconstructed from the results of study of the Ilya floodplain sediments (Alkhanai National Park). At the beginning of the Subboreal period, the regional climate became more arid, which led to a significant increase in steppe species communities in the landscapes. Intense climate aridization also took place at the beginning and at the end of the Subatlantic period of the Holocene. The alluvial-sedimentation rate increased during the weakening of aridization and decreased during cooling and the intensification of aridization. The obtained regional data are compared with data on the adjacent areas and the global climatic changes in the Northern Hemisphere.  相似文献   

A Record of Humidity Changes in Sections of a Valley Peatbog in the Southern Part of the Far East     

Razzhigaeva  N. G.  Kopoteva  T. A.  Makarova  T. R.  Grebennikova  T. A.  Lyashchevskaya  M. S.  Mokhova  L. M.  Ganzey  L. A.  Kudryavtseva  E. P.  Panichev  A. M.  Klimin  M. A.  Arslanov  Kh. A.  Maksimov  F. E.  Petrov  A. Yu. 《Doklady Earth Sciences》2023,507(1):S69-S80

Doklady Earth Sciences - Comprehensive study of sections of mares in the Bolshaya Ussurka River basin has allowed highlighting climate changes over the past 2900 years. Reconstructions are based on...  相似文献   

Collision efficiency calculation model as a software tool for microphysics of electrified clouds     

N. N. Klimin  V. Ya. Rivkind  V. A. Pachin 《Meteorology and Atmospheric Physics》1994,53(1-2):111-120

Summary A study has been made of the development of a collision efficiency calculation model for the interaction of charged drops in an external electric field over an extended range of Reynolds numbers. The method of superposition of flow fields obtained from the numerical solutions of the Navier-Stokes equations in case of liquid drop was used for the calculations. The available Reynolds numbers range is 0 to 45. The model was developed as a program for IBM-PC compatible computers and has been tested with recently published data.With 7 Figures  相似文献   

Holocene Dynamics of the East-Asian Monsoon in the Lower Amur Area     

V. B. Bazarova  M. A. Klimin  T. A. Kopоteva 《Geography and Natural Resources》2018,39(3):239-247

The spatial and temporal dynamics of monsoon in the Holocene has been reconstructed for the Lower Amur area. Four stages of cooling are determined (10300–10800, 8000–8300, 4200–4600 and 2500 yrs. ago). During these periods the intensity of the summer monsoon was weakest. The conventional northern boundary of monsoon influence moved from 54 to 48o N. Two retrospective scenarios of the interaction versions of interaction of seasonal atmospheric centers are suggested, which had influence on the dynamics of the cyclone process over the southern part of the Far East in the Holocene. The cyclones attenuated as a result of frequently recurring long-lasting periods of an increase in pressure in the region of the summer Far-Eastern and Asian depressions, and a decrease in pressure over the Sea of Okhotsk as well as the displacement of the center of the Okhotsk anticyclone toward southern latitudes, which was often in a quasi-stationary state blocking the passage of cyclones to the southern coast of the Sea of Okhotsk. In either case, the cyclones were forced away to lower latitudes and intensified over northern and eastern regions of China. The two scenarios could work both synchronously and metachronously.  相似文献   

Quantitative biome reconstruction using modern and late Quaternary pollen data from the southern part of the Russian Far East     

Lyudmila Mokhova  Pavel Tarasov  Valentina Bazarova  Mikhail Klimin 《Quaternary Science Reviews》2009,28(25-26):2913-2926

In this study we present a recent compilation of 286 modern surface pollen spectra from the southern part of the Russian Far East (42–54°N, 131–141°E) and use it to test the biome reconstruction method. Seventy terrestrial pollen taxa were assigned to plant functional types and then classified to eight regional biomes. When applied to 286 surface pollen spectra, the method assigns about 70% (201 sites) of the samples to the cool mixed forest biome, 17% – to the taiga, 2% – to the cool conifer forest, 3% – to the temperate deciduous forest, and 7% – to the steppe. The steppe reconstruction is characteristic of the pollen spectra from the agricultural areas around Lake Khanka. A visual comparison shows good agreement between pollen-derived biomes and actual vegetation distribution in the region. However, pollen and botanical data, compared with the potential vegetation distribution simulated from the modern climate dataset using the BIOME1 model, demonstrate that spatial distribution of cool mixed forest is underrepresented in the model simulation. The model sets the mean temperature of the coldest month of −15 °C as the factor limiting distribution of the temperate deciduous broadleaf taxa, while vegetation and pollen data from the region demonstrate that this limit should be lowered to −26 °C. Application of the method to the Gur 3–99 pollen record (50°00^′N, 137°03^′E) demonstrates that tundra vegetation predominated around the site prior to 14 ka BP (1 ka = 1000 cal. years). However, the local presence of boreal trees and mixed forest-tundra vegetation is suggested by relatively high taiga scores. Soon after 14 ka BP the scores of taiga become slightly higher than tundra scores. During 11.4–10.5 ka BP a cool conifer forest is reconstructed. Establishment of the full interglacial conditions is marked by the onset of cool mixed forest by 10.5 ka BP. Between 10.3 and 2.5 ka BP the scores of temperate deciduous forest are close to those of cool mixed forest and become distinctly lower during the late Holocene.  相似文献