Late Quaternary glaciation in the Tianshan and implications for palaeoclimatic change: a review   总被引：1，自引：0，他引：1  

XIANGKE XU  AXEL KLEIDON  LEE MILLER  SHIQIN WANG  LIQIANG WANG  GUOCHENG DONG 《Boreas: An International Journal of Quaternary Research》2010,39(2):215-232

Xu, X., Kleidon, A., Miller, L., Wang, S., Wang, L. & Dong, G. 2009: Late Quaternary glaciation in the Tianshan and implications for palaeoclimatic change: a review. Boreas, 10.1111/j.1502‐3885.2009.00118.x. ISSN 0300‐9483. The Tianshan mountain range has been extensively and repeatedly glaciated during the late Quaternary. Multiple moraines in this region record the extent and timing of late Quaternary glacier fluctuations. The moraines and their ages are described in three sub‐regions: eastern, central and western Tianshan. Notable glacial advances occurred during marine oxygen isotope stages (MIS) 6, 4, 3, 2, the Neoglacial and the Little Ice Age (LIA) in these sub‐regions. Glaciers in western Tianshan advanced significantly also during MIS 5, but not in eastern and central Tianshan. The local last glacial maximum (llgm) of the three sub‐regions pre‐dated the Last Glacial Maximum (LGM) and occurred during MIS 4 in eastern and central Tianshan, but during MIS 3 in western Tianshan. The spatial and temporal distribution of the glaciers suggests that precipitation (as snow at high altitude) is the main factor controlling glacial advance in the Tianshan. The late Quaternary climate in the Tianshan has been generally cold–dry during glacial times and warm–humid during interglacial times. Between neighbouring glacial times, the climate has had a more arid tendency in eastern and central Tianshan. These palaeoclimatic conditions inferred from glacial landforms indicate important relationships between the mid‐latitude westerly, the Siberian High and the Asian monsoon.  相似文献   

Paleoenvironmental implications of two relative indicator rodent taxa during the Pleistocene to Holocene transition in south‐eastern Washington state,USA          下载免费PDF全文

R. LEE LYMAN 《第四纪科学杂志》2014,29(7):691-697

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Impact of Horizontal Resolution and Cumulus Parameterization Scheme on the Simulation of Heavy Rainfall Events over the Korean Peninsula   总被引：1，自引：0，他引：1  

Seung-Woo LEE  Dong-Kyou LEE  Dong-Eon CHANG 《大气科学进展》2011,28(1):1-15

In this paper, we present the results from high-resolution numerical simulations of three heavy rainfall events over the Korean Peninsula. The numerical results show that the prediction accuracy for heavy rainfall events improved as horizontal resolution increased. The fine-grid precipitation fields were much closer to the real precipitation fields in the case of large synoptic forcing over the Korean Peninsula. In the case of large convective available potential energy and weak synoptic forcing, it seems that even when using a high resolution, the models still showed poor performance in reproducing the observed high precipitation amounts. However, activation of the cumulus parameterization scheme in the intermediate resolution of 9 km, even at a grid spacing of 3 km, had a positive impact on the simulation of the heavy rainfall event.  相似文献   

A cost-benefit analysis for the implementation of riparian buffer strips in the Shihmen reservoir watershed     

Chia-Ling CHANG  Ying-Sung HSU  Bing-Jean LEE  Li-Jung WENG 《国际泥沙研究》2011,(3):393-399

The Shihmen reservoir is an important water source for about 3.4 million people in northern Taiwan. To protect reservoir water quality,it is necessary to conserve and manage the associated watersheds. Riparian buffer strips can trap pollutants emitted near a watershed.The location and design of a buffer strip can influence its pollutant-trapping efficiency.Any commitment of land for use as a riparian buffer strip must consider the project’s economic effectiveness.The present research is a cost-benefit analysis of various possible land developments in the Shihmen reservoir watershed.This study has applied a regression equation to evaluate pollutant-trapping efficiency levels of riparian buffer strips of various widths.Planned buffer strips have been evaluated in terms of net economic effectiveness and benefit-cost ratio.Results indicate that the optimal buffer strip width is 30 m for the Shihmen reservoir watershed.  相似文献   

From the editors     

George C.LEE 《地震工程与工程振动(英文版)》2011,(3):I0001-I0001

Dear Contributors, Readers and Friends:This issue includes six papers on post-Wenchuan earthquake studies, representing just a small sample of the vast number of lessons learned from that devastating event in Sichuan, China. Since 2008, the world has experienced  相似文献   

The Influx of the Tsushima Current into the Central Ulleung Basin of East Sea (Sea of Japan), Korea     

Young-Suk BAK  and Seong-Joo LEE 《《地质学报》英文版》2014,88(6):1846-1851

A total of 85 samples, collected from the UBGH1-9 core taken from the Ulleung Basin, East Sea, Korea, were analyzed using diatom assemblages. 111 diatom species belonging to 46 genera were identified, and three diatom assemblage zones were established on the basis of occurrence and distribution pattern of diatoms. Diatom assemblage zone I(134.10–174 m) is characterized by a relatively high abundance of marine species, while the increased number of the brackish species is recorded in diatom assemblage zone II(75–125 m). The assemblage zones IIIa became drastic drop of valve abundances and brackish planktons, whereas it became increase during the IIIb. High Td values which indicate an influence of warm current are recorded both in diatom assemblage zone I and III, and low Td values in diatom assemblage zone II. Analysis of diatom assemblages indicating that the depositional condition moved from oceanic to littoral-neritic environments and that paleotemperature underwent a shift from warm to cold condition at the middle interval, and from cold to warm condition in the upper interval of the UBGH1-9 core. This suggests that the lower(130–162 m) and upper intervals(0–20 m) of the UBGH1-9 core were deposited in the warm current condition(Tsushima Warm Current).  相似文献   

A Study on a Snowband Associated with a Coastal Front and Cold-Air Damming Event of 3-4 February 1998 along the Eastern Coast of the Korean Peninsula     

Jae-Gyoo LEE  Ming XUE 《大气科学进展》2013,30(2):263-279

A 24-h simulation with the Advanced Regional Prediction System (ARPS) nonhydrostatic model is performed for the heavy snowfall event of 3–4 February 1998 along the eastern coast of Korean Peninsula; the results are used to understand the snowfall process, including why the precipitation maxima formed along the Yeongdong coastal region rather than over the mountain slope and ridge top during. The numerical simulation with a 4-km horizontal grid spacing and 43 levels reproduces very well the narrow snowband located off the eastern Korean coast, away from, instead of over, the Yeongdong coastal mountain range. The general evolution of the snowband agrees quite well with radar observations, while the water-equivalent precipitation amount agrees reasonably well with radar precipitation estimate. The simulation results clearly show that the snow band developed due to the lifting by a coastal front that developed because of the damming of cold air against the eastern slope of the coastal mountain range. The damming was enhanced by the advection of cold air by a low-level mountain-parallel jet from the north, formed due to geostrophic adjustment as the on-shore upslope air was decelerated by the mountain blocking. As the onshore flow weakened later due to synoptic-scale flow pattern change, the cold front propagated off shore and the precipitation dissipated.  相似文献   

Sulfur (³²S, ³³S, ³⁴S, ³⁶S) and oxygen (¹⁶O,¹⁷O,¹⁸O) isotopic ratios of primary sulfate produced from combustion processes     

C. C. &#;W. LEE  J. H. SAVARINO  H. CACHIER  M. H. THIEMENS 《Tellus. Series B, Chemical and physical meteorology》2002,54(3):193-200

The recent discovery of an anomalous enrichment in ¹⁷O isotope in atmospheric sulfate has opened a new way to investigate the oxidation pathways of sulfur in the atmosphere. From laboratory investigations, it has been suggested that the wet oxidation of sulfur in rain droplets was responsible for the excess ¹⁷O. In order to confirm this theory, sulfur and oxygen isotope ratios of different primary sulfates produced during fossil fuel combustion have been investigated and are reported. None of these samples exhibits any anomalous oxygen or sulfur isotopic content, as compared to urban sulfate aerosols. These results, in agreement with the laboratory investigations, reinforce the idea of an aqueous origin for the oxygen-17 anomaly found in tropospheric sulfates.  相似文献   

Characterization and significance of shocked quartz from the Woodleigh mpact structure,Western Australia     

R. M. HOUGH  M. R. LEE  A. W. R. BEVAN 《Meteoritics & planetary science》2003,38(9):1341-1350

Abstract— We re‐examined the buried Woodleigh structure in Western Australia, which has been inferred to be a multi‐ringed, 120 km diameter impact crater, because the proposed size and possible synchronicity with one of the pre‐Mesozoic mass extinction events has attracted controversy. We undertook a detailed study of the petrology and mineralogy of a number of samples of core from the Woodleigh‐1 borehole that was drilled into the central uplift of the structure. Crystalline Proterozoic basement rocks comprising granites and gneisses in the Woodleigh‐1 core contain minor brecciation in discrete veins and reveal clear evidence of shock metamorphism over the full extent of the core. Imaging of laboratory‐etched quartz showed that a large number of grains contain shock deformation lamellae. Microstructural and crystallographic analysis of these lamellae by TEM showed that they are planar deformation features (PDFs) that have subsequently undergone annealing and water assisted recrystallization. The available geological, petrographic, and mineralogical evidence suggest that Woodleigh is an eroded impact crater that is nearer to 60 km than 120 km in diameter. Future drilling projects should better constrain the level of erosion, and may reveal any preserved impact lithologies.  相似文献   

Simulation of Storm Surge and Wave Due to Typhoon Isewan (5915)     

Jin-Hee YUK  Kyeong Ok KIM  Han Soo LEE  Byung Ho CHOI 《海洋工程》2015,29(4):473-488

An integrally coupled wave-tide-surge model was developed and then applied to the simulation of the wave-typhoon surge for the typhoon Isewan (typhoon Vera (5915)), which is the strongest typhoon that has struck Japan and caused incalculable damage. An integrally coupled tide-surge-wave model using identical and homogeneous meshes in an unstructured grid system was used to correctly resolve the physics of wave-circulation interaction in both models. All model components were validated independently. The storm surge and wave properties such as the surge height, the significant wave height, wave period and direction were reproduced reasonably under the meteorological forcing, which was reprocessed to be close to the observations. The resulting modeling system can be used extensively for the prediction of the storm surge and waves and the usual barotropic forecast.  相似文献